JP2002042785A - Lithium battery - Google Patents
Lithium batteryInfo
- Publication number
- JP2002042785A JP2002042785A JP2000220683A JP2000220683A JP2002042785A JP 2002042785 A JP2002042785 A JP 2002042785A JP 2000220683 A JP2000220683 A JP 2000220683A JP 2000220683 A JP2000220683 A JP 2000220683A JP 2002042785 A JP2002042785 A JP 2002042785A
- Authority
- JP
- Japan
- Prior art keywords
- active material
- electrode
- lithium
- thickness
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Primary Cells (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はリチウム電池に関し、特
に電極を改良したリチウム電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium battery, and more particularly to a lithium battery having an improved electrode.
【０００２】[0002]
【従来の技術】近年、携帯電話やノートパソコン等の携
帯用電子機器の高性能化および小型化にはめざましいも
のがあり、これら携帯電子機器に使用される電池に対
し、高エネルギー密度化および小型化が望まれている。2. Description of the Related Art In recent years, there has been a remarkable improvement in performance and miniaturization of portable electronic devices such as mobile phones and notebook personal computers. Is desired.
【０００３】リチウムイオン電池は、高電圧でかつ高エ
ネルギー密度を有し、その点でこれらの携帯機器用電源
をはじめとする多方面の分野で期待され、盛んに研究さ
れている。[0003] Lithium ion batteries have a high voltage and a high energy density. In this respect, lithium ion batteries are expected in various fields such as power supplies for portable devices, and are being actively studied.
【０００４】リチウムイオン電池の電極はリチウムイオ
ンを貯蔵・放出するなど、電池特性を左右する非常に重
要な役割を果たしている。[0004] Electrodes of lithium ion batteries play a very important role in determining battery characteristics, such as storing and releasing lithium ions.
【０００５】この電極は正極活物質または負極活物質に
ポリテトラフルオロエチレンやポリフッ化ビニリデン等
の有機バインダーと黒鉛などの電子伝導助剤ならびに溶
媒を加えて混合し、スラリーを作製し、その後、このス
ラリーをアルミニウムや銅製の金属箔上等の集電体上に
塗布して作製されている。[0005] In this electrode, an organic binder such as polytetrafluoroethylene or polyvinylidene fluoride, an electron conduction aid such as graphite and a solvent are added to a positive electrode active material or a negative electrode active material and mixed to form a slurry. It is prepared by applying a slurry onto a current collector such as a metal foil made of aluminum or copper.
【０００６】上記正極活物質としてコバルト酸リチウム
（LiCoO2）やマンガン酸リチウム（LiMn2O4）等のリチ
ウム遷移金属複合酸化物が用いられる。負極活物質とし
ては、黒鉛、コークス、繊維状カーボン等が用いられて
いる。As the positive electrode active material, a lithium transition metal composite oxide such as lithium cobalt oxide (LiCoO 2 ) or lithium manganate (LiMn 2 O 4 ) is used. As the negative electrode active material, graphite, coke, fibrous carbon, or the like is used.
【０００７】しかしながら、このように集電体上に塗布
して形成された電極においては、電池特性に直接寄与し
ない有機バインダーや、粒子間の電子伝導を補助する役
目である電子伝導助剤が多く含まれており、そのため、
電極内における活物質充填率が低くなり、その結果、電
池容量が小さくなり、エネルギー密度が低下していた。However, in the electrode formed by coating on the current collector, there are many organic binders which do not directly contribute to the battery characteristics and an electron conduction aid which assists electron conduction between particles. Included, so
The active material filling rate in the electrode was reduced, and as a result, the battery capacity was reduced, and the energy density was reduced.
【０００８】そこで、リチウム電池におけるエネルギー
密度を向上させるために、その電極を形成する活物質の
充填率を高めなければならない。Therefore, in order to improve the energy density of a lithium battery, the filling rate of the active material forming the electrode must be increased.
【０００９】活物質を高密度に充填する方法としては、
活物質を焼結することが挙げられる。As a method of filling the active material with high density,
Sintering the active material;
【００１０】活物質を焼結する場合、電子伝導助剤とし
ての炭素材料が含まれていると焼成温度が炭素材料の分
解温度より高温であることで、焼結時に炭素材料が燃焼
していた。従って、焼結を行う場合、従来のリチウムイ
オン電池に使用される電子伝導助剤としての炭素材料を
利用することはむずかしくなっていた。When sintering an active material, if a carbon material is included as an electron conduction aid, the sintering temperature is higher than the decomposition temperature of the carbon material. . Therefore, when sintering, it has been difficult to use a carbon material as an electron conduction aid used in conventional lithium ion batteries.
【００１１】一方、電子伝導助剤である炭素材料を使用
せず、活物質のみで電極を構成し、これによって十分な
電子伝導性を達成した技術が提案がされている。On the other hand, there has been proposed a technique in which an electrode is formed only of an active material without using a carbon material as an electron conduction aid, thereby achieving a sufficient electron conductivity.
【００１２】例えば、特開平８−１４８１４１号では、
活物質をバインダーと共にスラリー化し、ドクターブレ
ード法により集電体基板上に塗布し、そして、膜厚２０
μｍ以下の活物質層を形成し、その後、この活物質層を
焼成することで、十分な電子伝導性をもつ電極を得てい
る。For example, in JP-A-8-148141,
The active material was slurried with a binder, applied to the current collector substrate by a doctor blade method, and
An electrode having a sufficient electron conductivity is obtained by forming an active material layer having a thickness of μm or less and then firing the active material layer.
【００１３】このように電極の厚みを２０μｍ以下にし
たことで、活物質粒子数個分の厚みとなり、これによっ
て、電子伝導性が十分に確保される。By setting the thickness of the electrode to 20 μm or less in this manner, the thickness becomes equivalent to several active material particles, and thereby the electron conductivity is sufficiently ensured.
【００１４】[0014]
【発明が解決しようとする課題】しかしながら、特開平
８−１４８１４１号が提案している電極厚み２０μｍ以
下にした場合には、活物質を高密度に充填しても、その
活物質の絶対量は少なく、そのために電池のエネルギー
密度および容量を向上させる、という電池自体の本質的
な改善には、いまだ至っていない。However, when the thickness of the electrode is set to 20 μm or less as proposed in Japanese Patent Application Laid-Open No. 8-148141, even if the active material is densely filled, the absolute amount of the active material is reduced. However, the essential improvement of the battery itself, that is, the improvement of the energy density and capacity of the battery has not yet been achieved.
【００１５】しかも、厚みが２０μｍ以下の電極となる
と、ハンドリング性が悪く、取り扱いが困難となり、こ
れにより、煩雑な製造工程が必要となり、その結果、製
造コストの上昇を招いていた。Further, when the thickness of the electrode is 20 μm or less, the handling property is poor and the handling becomes difficult. As a result, a complicated manufacturing process is required, and as a result, the manufacturing cost is increased.
【００１６】本発明は叙上に鑑みて完成されたものであ
り、その目的はエネルギー密度および容量を向上させた
リチウム電池を提供することにある。The present invention has been completed in view of the above, and an object of the present invention is to provide a lithium battery having improved energy density and capacity.
【００１７】本発明の他の目的は２０μｍを超える厚み
の電極を設けて、ハンドリング性を高めて取り扱いを容
易にし、簡単な製造工程となし、これにより、製造コス
トの下げ、その結果、低コストなリチウム電池を提供す
ることにある。Another object of the present invention is to provide an electrode having a thickness of more than 20 μm to enhance handling properties and facilitate handling, thereby simplifying the manufacturing process, thereby reducing the manufacturing cost and consequently lowering the cost. To provide a lithium battery.
【００１８】[0018]
【課題を解決するための手段】本発明のリチウム電池
は、一対の電極でもって、その間に電解質を挟持する構
成において、前記電極を活物質の充填率が５０〜８０％
である焼結体でもって板状に構成し、その厚みを２０μ
ｍを超え、かつ２００μｍ以下の範囲内に設定したこと
を特徴とする。また、本発明のリチウム電池は、前記活
物質がLi1+xMn2-xO4（０≦x≦０．２）、LiMn2-yMeyO4
（Me＝Ni、Cr、Cu、Zn、０＜y≦０．６）、Li4Ti5O12、
Li4Mn5O1 2よりなる群から選択した少なくとも１種から
成ることを特徴とする。According to the lithium battery of the present invention, in a configuration in which an electrolyte is sandwiched between a pair of electrodes, the electrodes are filled with an active material at a filling rate of 50 to 80%.
And made into a plate shape with a thickness of 20μ.
m and within 200 μm or less. Further, in the lithium battery of the present invention, the active material is Li 1 + x Mn 2-x O 4 (0 ≦ x ≦ 0.2) and LiMn 2-y Me y O 4
(Me = Ni, Cr, Cu, Zn, 0 <y ≦ 0.6), Li 4 Ti 5 O 12 ,
Characterized in that it consists of at least one selected from the group consisting of Li 4 Mn 5 O 1 2.
【００１９】[0019]
【作用】本発明のリチウム電池は、上記構成のように厚
みが２０μｍを超え、かつ２００μｍ以下の範囲内に設
定した焼結体でもって、板状の電極を用いることで、ハ
ンドリング性が良好となり、さらに焼結体の電極である
ことで、高エネルギー密度で充放電特性に優れ、低コス
トなリチウム電池が得られる。The lithium battery of the present invention has good handling properties by using a plate-like electrode with a sintered body having a thickness exceeding 20 μm and not more than 200 μm as described above. Further, since the electrode is made of a sintered body, a low-cost lithium battery having a high energy density and excellent charge / discharge characteristics can be obtained.
【００２０】また、酸化物系活物質の場合、通常の使用
方法では導電性を持たせるために導電剤を添加しなけれ
ばならないが、これに対し本発明のリチウム電池によれ
ば、活物質の充填率を５０〜８０％とすることで、粒子
同士の接触面積が増加し、電子伝導助剤を使用しなくて
も十分な電子伝導性が得られる。In the case of an oxide-based active material, a conductive agent must be added in order to impart conductivity in a normal use method. On the other hand, according to the lithium battery of the present invention, the active material of the active material is not used. By setting the filling rate to 50 to 80%, the contact area between particles increases, and sufficient electron conductivity can be obtained without using an electron conduction aid.
【００２１】また、本発明のリチウム電池においては、
電極を焼結することで、充放電に伴う膨張収縮という点
で問題となるが、この問題を解消すべく、活物質をLi
1+xMn2 -xO4（０≦x≦０．２）、LiMn2-yMeyO4（Me＝N
i、Cr、Cu、Zn、０＜y≦０．６）、Li4Ti5O12、Li4Mn5O
12よりなる少なくとも１種でもって構成することで、充
放電反応に伴う膨張収縮を抑制したり、それをなくすこ
とができる。Further, in the lithium battery of the present invention,
Sintering the electrodes poses a problem in terms of expansion and contraction due to charge and discharge.
1 + x Mn 2 -x O 4 (0 ≦ x ≦ 0.2), LiMn 2-y Me y O 4 (Me = N
i, Cr, Cu, Zn, 0 <y ≦ 0.6), Li 4 Ti 5 O 12 , Li 4 Mn 5 O
By using at least one kind of 12 , it is possible to suppress or eliminate the expansion and contraction accompanying the charge / discharge reaction.
【００２２】[0022]
【発明の実施の形態】以下、本発明のリチウム電池を図
でもって説明する。図１は本発明に係るリチウム電池の
構成例を示す断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The lithium battery of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a configuration example of a lithium battery according to the present invention.
【００２３】同図において、１は正極缶、２は正極集電
体、３は正極、４は電解質、５は負極缶、６は負極集電
体、７は負極、８は絶縁パッキングである。In the figure, 1 is a positive electrode can, 2 is a positive electrode current collector, 3 is a positive electrode, 4 is an electrolyte, 5 is a negative electrode can, 6 is a negative electrode current collector, 7 is a negative electrode, and 8 is an insulating packing.
【００２４】正極集電体２または負極集電体８は、正極
３または負極７の集電のために配置され、例えば導電性
接着剤からなる。この導電性接着剤は、例えば、カーボ
ンブラック、グラファイト、金、銀、ニッケル、酸化亜
鉛、酸化錫、酸化アンチモンをドープした酸化錫、酸化
インジウム、酸化錫をドープした酸化インジウム、酸化
チタン、チタン酸カリウムのうちの少なくとも一種類か
らなる導電性フィラーと、アクリル系樹脂、エポキシ樹
脂、シリコン系樹脂、ポリアミド系樹脂、フェノール樹
脂、ポリエステル系樹脂、ポリイミド系樹脂のうちの少
なくとも一種類の高分子粘着剤とからなる混合物を挙げ
ることができる。The positive electrode current collector 2 or the negative electrode current collector 8 is arranged for collecting the current of the positive electrode 3 or the negative electrode 7, and is made of, for example, a conductive adhesive. Examples of the conductive adhesive include carbon black, graphite, gold, silver, nickel, zinc oxide, tin oxide, tin oxide doped with antimony oxide, indium oxide, indium oxide doped with tin oxide, titanium oxide, and titanic acid. A conductive filler composed of at least one of potassium, and an acrylic resin, an epoxy resin, a silicon resin, a polyamide resin, a phenol resin, a polyester resin, and a polymer resin of at least one of polyimide resins And mixtures thereof.
【００２５】正極３および負極７に用いる活物質として
は、例えば、リチウムマンガン複合酸化物、二酸化マン
ガン、リチウムニッケル複合酸化物、リチウムコバルト
複合酸化物、リチウムニッケルコバルト複合酸化物、リ
チウムバナジウム複合酸化物、リチウムチタン複合酸化
物、酸化チタン、酸化ニオブ、酸化バナジウム、酸化タ
ングステンなど、ならびにそれらの誘電体が挙げられ
る。Examples of the active material used for the positive electrode 3 and the negative electrode 7 include lithium manganese composite oxide, manganese dioxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, and lithium vanadium composite oxide. , Lithium-titanium composite oxide, titanium oxide, niobium oxide, vanadium oxide, tungsten oxide and the like, and dielectrics thereof.
【００２６】上述の遷移金属酸化物のうち、特にLi1+xM
n2-xO4（０≦x≦０．２）、LiMn2-yMeyO4（Me＝Ni、C
r、Cu、Zn、０＜y≦０．６）、Li4Ti5O12およびLi4Mn5O
12よりなる群は、充放電中の体積変化が小さい活物質で
あり、本発明に用いる活物質としてより望ましい。Among the above transition metal oxides, Li 1 + x M
n 2-x O 4 (0 ≦ x ≦ 0.2), LiMn 2-y Me y O 4 (Me = Ni, C
r, Cu, Zn, 0 <y ≦ 0.6), Li 4 Ti 5 O 12 and Li 4 Mn 5 O
The group consisting of 12 is an active material having a small volume change during charge and discharge, and is more preferable as the active material used in the present invention.
【００２７】ここで、正極活物質と負極活物質は、相対
的なものであって、２種類の遷移金属酸化物の充放電電
位を比較し、より貴な電位を示すものを正極に、より卑
な電位を示すものを負極にすることで、任意の電圧の電
池を構成することができる。Here, the positive electrode active material and the negative electrode active material are relative, and the charge and discharge potentials of two types of transition metal oxides are compared. By using a negative potential as the negative electrode, a battery having an arbitrary voltage can be formed.
【００２８】焼結体により構成する電極は、板状であっ
て、その厚みは２０μｍを超え、かつ２００μｍ以下の
範囲内にする。The electrode made of a sintered body is plate-shaped and has a thickness exceeding 20 μm and not more than 200 μm.
【００２９】電極厚みが２０μｍ以下の場合、活物質の
絶対量が少なく、電池のエネルギー密度、容量を向上さ
せる本質的な改善には至らない。また、ハンドリングが
悪く、取り扱いが困難等の問題がある。When the thickness of the electrode is less than 20 μm, the absolute amount of the active material is small, and the essential improvement for improving the energy density and capacity of the battery cannot be achieved. Further, there is a problem that handling is poor and handling is difficult.
【００３０】焼結体電極の厚みが２００μｍを超える
と、負荷特性が著しく低下する。When the thickness of the sintered body electrode exceeds 200 μm, the load characteristics are significantly reduced.
【００３１】このように厚みを規定した電極に対し、さ
らに活物質の充填率は５０〜８０％、好ましくは６５〜
８０％とする。The filling rate of the active material is 50 to 80%, preferably 65 to 80% with respect to the electrode having such a defined thickness.
80%.
【００３２】活物質の充填率が５０％未満の場合、焼結
体電極内には空隙が多く、高エネルギー密度の電池にな
らない。また、８０％を超える活物質充填率を得ようと
すると、高温での焼成が必要となり、充放電に伴う結晶
の膨張・収縮を抑えるという点で、活物質の性質を特徴
づけている結晶構造が破壊される。When the filling rate of the active material is less than 50%, there are many voids in the sintered body electrode, and a battery having a high energy density cannot be obtained. Further, in order to obtain an active material filling rate exceeding 80%, firing at a high temperature is required, and the crystal structure characterizing the properties of the active material is that the expansion and shrinkage of the crystal due to charge and discharge are suppressed. Is destroyed.
【００３３】かかる焼結体電極の製造には、下記の
（１）〜（３）のいずれの方法を用いてもよい。 （１）活物質を成形助剤を溶解させた水もしくは溶剤に
分散させ、必要に応じては可塑剤、分散材を混合してス
ラリーを調整し、このスラリーを基材フィルム上に塗
布、乾燥した後、基材フィルムから剥離させ、焼結させ
る。 （２）活物質を直接もしくは造粒したものを金型に投入
してプレス機で加圧成形した後焼結させる。 （３）造粒した活物質をロールプレス機で加圧成形して
シート状に加工し、焼結させる。For the production of such a sintered body electrode, any of the following methods (1) to (3) may be used. (1) The active material is dispersed in water or a solvent in which a molding aid is dissolved, and if necessary, a plasticizer and a dispersant are mixed to prepare a slurry, and the slurry is applied to a base film and dried. After that, it is separated from the base film and sintered. (2) The active material is directly or granulated, put into a mold, press-formed by a press machine, and then sintered. (3) The granulated active material is press-formed by a roll press, processed into a sheet, and sintered.
【００３４】（２）および（３）の造粒については、
（１）の方法で述べたスラリーから造粒する湿式造粒で
あっても溶剤を用いない乾式造粒であってもよい。ま
た、（２）の方法では成形助剤を用いなくてもよい。Regarding the granulation of (2) and (3),
The wet granulation of granulating from the slurry described in the method (1) or the dry granulation using no solvent may be used. In the method (2), a molding aid may not be used.
【００３５】上記の成形助剤としては、例えばポリアク
リル酸、カルボキシメチルセルロース、ポリフッ化ビニ
リデン、ポリビニルアルコール、ジアセチルセルロー
ス、ヒドロキシプロピルセルロース、ポリビニルクロラ
イド、ポリビニルピロリドンなどの１種もしくは２種以
上の混合物が挙げられる。Examples of the molding aid include one or a mixture of two or more of polyacrylic acid, carboxymethylcellulose, polyvinylidene fluoride, polyvinyl alcohol, diacetylcellulose, hydroxypropylcellulose, polyvinyl chloride, and polyvinylpyrrolidone. Can be
【００３６】基材フィルムとしては、例えばポリエチレ
ンテレフタレート、ポリプロピレン、ポリエチレン、テ
トラフルオロエチレン等の樹脂フィルムを用いることが
できる。As the substrate film, for example, a resin film of polyethylene terephthalate, polypropylene, polyethylene, tetrafluoroethylene, or the like can be used.
【００３７】電解質４は、イオン伝導性を有するもので
あれば液体でも固体でもよい。電解質４には有機溶媒に
電解質塩を溶解させた有機電解液や高分子固体電解質に
電解質塩を溶解させ、重合させた高分子固体電解質、ま
たは有機電解液と高分子固体電解質を複合させたゲル電
解質、または無機材料からなる無機固体電解質を用いる
ことができる。The electrolyte 4 may be liquid or solid as long as it has ion conductivity. The electrolyte 4 is a polymer solid electrolyte prepared by dissolving an electrolyte salt in an organic solvent or a polymer solid electrolyte in which an electrolyte salt is dissolved in an organic solvent or a polymer solid electrolyte, or a gel obtained by combining an organic electrolyte and a polymer solid electrolyte. An electrolyte or an inorganic solid electrolyte made of an inorganic material can be used.
【００３８】ここで、有機電解液を使用する場合、図１
に示す４は有機電解液を含んだセパレータとみなせる。Here, when an organic electrolyte is used, FIG.
Can be regarded as a separator containing an organic electrolyte.
【００３９】有機電解液に用いる有機溶媒には例えばエ
チレンカーボネート、プロピレンカーボネート、ブチレ
ンカーボネート、ジメチルカーボネート、ガンマ−ブチ
ロラクトン、スルホラン、１，２−ジメトキシエタン、
１，３−ジメトキシプロパン、ジメチルエーテル、テト
ラヒドロフラン、２−メチルテトラヒドロフラン、炭酸
ジメチル、炭酸ジエチル、メチルエチルカーボネートか
ら選ばれる１種もしくは２種以上を混合した溶媒が挙げ
られる。Examples of the organic solvent used in the organic electrolyte include ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, gamma-butyrolactone, sulfolane, 1,2-dimethoxyethane,
Solvents in which one or more solvents selected from 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl carbonate, diethyl carbonate, and methyl ethyl carbonate are used.
【００４０】電解質塩としては、例えばLiClO4、LiB
F4、LiPF6、LiCF3SO3、LiN(CF3SO2)2、LiN(C2F5SO2)2な
どのリチウム塩を挙げることができる。As the electrolyte salt, for example, LiClO 4 , LiB
Lithium salts such as F 4 , LiPF 6 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , and LiN (C 2 F 5 SO 2 ) 2 can be given.
【００４１】有機電解液を使用するときのセパレータと
しては、例えばポリオレフィン繊維性の不織布やポリオ
レフィン繊維性の微多孔膜を用いることができる。ここ
で、ポリオレフィン繊維としては、ポリプロピレン繊
維、ポリエチレン繊維などを挙げることができる。As the separator when the organic electrolyte is used, for example, a polyolefin fibrous nonwoven fabric or a polyolefin fibrous microporous membrane can be used. Here, examples of the polyolefin fiber include a polypropylene fiber and a polyethylene fiber.
【００４２】高分子固体電解質としては、例えば、ポリ
エチレンオキシド骨格を持つ高分子やプロピレンオキシ
ド骨格を持つ高分子、またそれらの混合物および共重合
体などが挙げられる。Examples of the polymer solid electrolyte include a polymer having a polyethylene oxide skeleton, a polymer having a propylene oxide skeleton, and mixtures and copolymers thereof.
【００４３】無機固体電解質としては、例えば、Li1.3A
l0.3Ti1.7（PO4）3やLi3.6Ge0.6V0. 4O4などの結晶質固
体電解質、30LiI−41Li2O−29P2O5や40Li2O−35B2O3−2
5LiNbO3などの酸化物系非晶質固体電解質、45LiI−37Li
2S−18P2S5や１Li3PO4−63Li2S−36SiS2などの硫化物系
非晶質固体電解質などが挙げられる。As the inorganic solid electrolyte, for example, Li 1.3 A
l 0.3 Ti 1.7 (PO 4) 3 and Li 3.6 Ge 0.6 V 0. crystalline solid electrolyte such as 4 O 4, 30LiI-41Li 2 O-29P 2 O 5 and 40Li 2 O-35B 2 O 3 -2
Oxide-based amorphous solid electrolytes such as 5LiNbO 3, 45LiI-37Li
Such as 2 S-18P 2 S 5 and 1Li 3 PO 4 -63Li 2 S- 36SiS 2 sulfide-based amorphous solid electrolyte, and the like.
【００４４】正極集電体により正極が接着された正極缶
と負極集電体により負極が接着された負極缶は絶縁パッ
キング８を介してかしめ合わされて封口される。The positive electrode can having the positive electrode bonded to the positive electrode current collector and the negative electrode can having the negative electrode bonded to the negative electrode current collector are caulked via an insulating packing 8 and sealed.
【００４５】本発明のリチウム電池は一次電池であって
も二次電池であっても良い。電池形状は角型、円筒型、
ボタン型、コイン型、扁平型などに限定されるものでは
ない。The lithium battery of the present invention may be a primary battery or a secondary battery. Battery shape is square, cylindrical,
It is not limited to a button type, a coin type, a flat type and the like.
【００４６】かくして、本発明のリチウム電池によれ
ば、正極３および／または負極７を焼結体電極で構成す
るに当り、その厚みを２０μｍを超え、かつ２００μｍ
以下に、そして、活物質充填率は５０〜８０％、好まし
くは６５〜８０％にすることで、ハンドリング性が良好
となり、十分な電子伝導性が得られ、高エネルギー密度
で充放電特性に優れ、低コストとなる。Thus, according to the lithium battery of the present invention, when constituting the positive electrode 3 and / or the negative electrode 7 by a sintered electrode, the thickness thereof exceeds 20 μm and is 200 μm.
Below, and by setting the active material filling rate to 50 to 80%, preferably 65 to 80%, handling properties are improved, sufficient electron conductivity is obtained, and charge / discharge characteristics are excellent at high energy density. , Lower cost.
【００４７】[0047]
【実施例】次に本発明の実施例を述べる。（例１）〜
（例８）は本発明の実施例であり、さらに（比較例１）
〜（比較例６）も示す。Next, embodiments of the present invention will be described. (Example 1)-
(Example 8) is an example of the present invention, and further (Comparative Example 1).
-(Comparative Example 6) are also shown.
【００４８】（例１）水酸化リチウムと二酸化チタンを
LiとTiのモル比が４：５となるように混合し、この混合
物を大気中の８５０℃で１５時間加熱合成することによ
りリチウムチタン複合酸化物（Li4Ti5O12）を調整し
た。Example 1 Lithium hydroxide and titanium dioxide
Li and Ti were mixed at a molar ratio of 4: 5, and the mixture was heated and synthesized at 850 ° C. in the air for 15 hours to prepare a lithium-titanium composite oxide (Li4Ti5O12).
【００４９】次に、この焼成粉末に成形助剤、可塑剤、
分散剤、溶剤を加えて混合してスラリーを調整した。Next, a molding aid, a plasticizer,
A slurry was prepared by adding and mixing a dispersant and a solvent.
【００５０】このスラリーをポリエチレンテレフタレー
ト（PET）フィルム上にドクターブレード法にて塗布し
た後、乾燥させて厚さ２６μmの生成形体シートを作製
した。This slurry was applied on a polyethylene terephthalate (PET) film by a doctor blade method, and then dried to produce a formed sheet having a thickness of 26 μm.
【００５１】この生成形体シートを熱処理後の寸法が１
８φになるように円状に打ち抜き、大気中にて７８０℃
で熱処理を行った。The size of this formed sheet after heat treatment is 1
Punched in a circle to 8φ, 780 ° C in air
The heat treatment was performed.
【００５２】この焼結体電極の厚みは２２μmであっ
た。また、この電極における活物質充填率は７０％であ
った。The thickness of the sintered body electrode was 22 μm. The active material filling rate of this electrode was 70%.
【００５３】電解液は、プロピレンカーボネート（Ｐ
Ｃ）と、１,２−ジメトキシエタン（ＤＭＥ）を体積比
１：１の割合で混合した溶媒に過塩素酸リチウム(ＬiＣ
lＯ4)を１モル／ｌで溶解させた有機電解液を用いた。The electrolyte is propylene carbonate (P
C) and 1,2-dimethoxyethane (DME) at a volume ratio of 1: 1 in a solvent mixed with lithium perchlorate (LiC).
An organic electrolyte in which (lO 4 ) was dissolved at 1 mol / l was used.
【００５４】セパレータとしては上記有機電解液を含浸
させたポリプロピレン繊維製の不織布を用いた。負極に
は金属リチウム箔を用いた。As the separator, a nonwoven fabric made of polypropylene fiber impregnated with the above organic electrolyte was used. A metal lithium foil was used for the negative electrode.
【００５５】得られた焼結体電極を正極３として導電性
接着剤からなる正極集電体２により正極缶１内に収め、
上記セパレータを正極３上に配置し、負極側は負極７と
して用いる金属リチウム箔を直接負極缶５に貼りつける
ことで集電を行った。The obtained sintered body electrode was placed in a positive electrode can 1 as a positive electrode 3 with a positive electrode current collector 2 made of a conductive adhesive.
The separator was arranged on the positive electrode 3, and on the negative electrode side, current collection was performed by directly attaching a metal lithium foil used as the negative electrode 7 to the negative electrode can 5.
【００５６】上記正極缶１と負極缶５を絶縁パッキン８
を介してかしめ合わせ、コイン型電池セルを組み立て
た。The positive electrode can 1 and the negative electrode can 5 are separated from each other by an insulating packing 8.
To form a coin-type battery cell.
【００５７】（例２）焼結体電極の厚みを８０μｍにし
たこと以外は（例１）と同じ方法でコイン型電池セルを
組み立てた。(Example 2) A coin-type battery cell was assembled in the same manner as in (Example 1) except that the thickness of the sintered body electrode was changed to 80 µm.
【００５８】（例３）焼結体電極の厚みを１４０μｍに
したこと以外は（例１）と同じ方法でコイン型電池セル
を組み立てた。(Example 3) A coin-type battery cell was assembled in the same manner as in (Example 1) except that the thickness of the sintered body electrode was changed to 140 µm.
【００５９】（例４）焼結体電極の厚みを２００μｍに
したこと以外は（例１）と同じ方法でコイン型電池セル
を組み立てた。Example 4 A coin-type battery cell was assembled in the same manner as in Example 1 except that the thickness of the sintered body electrode was changed to 200 μm.
【００６０】次に比較例１と比較例２を述べる。Next, Comparative Examples 1 and 2 will be described.
【００６１】（比較例１）焼結体電極の厚みを１０μｍ
にしたこと以外は（例１）と同じ方法でコイン型電池セ
ルを組み立てた。(Comparative Example 1) The thickness of the sintered body electrode was 10 μm
A coin-type battery cell was assembled in the same manner as in (Example 1) except for the following.
【００６２】（比較例２）焼結体電極の厚みを２５０μ
ｍにしたこと以外は（例１）と同じ方法でコイン型電池
セルを組み立てた。(Comparative Example 2) The thickness of the sintered electrode was 250 μm.
A coin-type battery cell was assembled in the same manner as in (Example 1) except that m was changed to m.
【００６３】以上のように得られた各電池セルについ
て、１０時間率に相当する電流値にて充放電試験を行っ
た。充電終止電圧は２．０Ｖ、放電終止電圧は１．２Ｖ
とした。Each of the battery cells obtained as described above was subjected to a charge / discharge test at a current value corresponding to a 10-hour rate. Charge end voltage is 2.0V, discharge end voltage is 1.2V
And
【００６４】そして、評価として、容量を活物質利用率
と併せて表１に示す。For evaluation, the capacity is shown in Table 1 together with the active material utilization rate.
【００６５】[0065]
【表１】 [Table 1]
【００６６】表１から明らかな通り、焼結体電極厚みが
２００μｍまでは活物質の絶対量が多くなったためと推
測される容量増加が見られるが、本発明範囲外である比
較例２の２５０μｍの焼結体電極を用いたセルは容量が
著しく減少している。これは、表１の活物質利用率から
もわかるように電極厚みが増したことで内部抵抗が増
し、負荷特性が悪くなったためと考えられる。電極厚み
が２００μｍを超える場合、例えば１００時間率を超え
るような低いレートでの充放電を行えば利用率が高くな
り、充填した活物質分の容量を得ることができるが、こ
のような極めて低いレートの充放電では実用的ではな
い。また、比較例１の電極厚みが１０μｍのセルにおい
ては活物質の絶対量が少ないため、容量が著しく小さ
く、実用十分とは言いがたい。As is clear from Table 1, the capacity increase is presumed to be due to the increase in the absolute amount of the active material up to the sintered body electrode thickness of 200 μm. The cell using the sintered body electrode of (1) has a remarkably reduced capacity. This is considered to be because, as can be seen from the active material utilization rate in Table 1, the internal resistance increased due to the increase in the electrode thickness, and the load characteristics deteriorated. When the electrode thickness exceeds 200 μm, for example, if charge and discharge are performed at a low rate such as exceeding 100 hour rate, the utilization rate increases, and the capacity of the filled active material can be obtained. It is not practical for rate charging and discharging. In the cell of Comparative Example 1 having an electrode thickness of 10 μm, since the absolute amount of the active material was small, the capacity was extremely small, and it cannot be said that the cell is practically sufficient.
【００６７】次に（例５）〜（例７）および（比較例
３）、（比較例４）を述べる。 （例５）水酸化リチウムと二酸化チタンをLiとTiのモル
比が４：５となるように混合し、この混合物を大気中の
８５０℃で１５時間加熱合成することによりリチウムチ
タン複合酸化物（Li4Ti5O12）を調整した。Next, (Example 5) to (Example 7), (Comparative Example 3) and (Comparative Example 4) will be described. Example 5 Lithium hydroxide and titanium dioxide were mixed such that the molar ratio of Li and Ti was 4: 5, and this mixture was heated and synthesized at 850 ° C. in the air for 15 hours to obtain a lithium-titanium composite oxide ( Li 4 Ti 5 O 12 ) was adjusted.
【００６８】この焼成粉末に成形助剤、溶剤を加えて混
合してスラリーを調整した。A slurry was prepared by adding a molding aid and a solvent to the fired powder and mixing them.
【００６９】そして、このスラリーをポリエチレンテレ
フタレート（PET）フィルム上にドクターブレード法に
て塗布した後、乾燥させて厚さ１０５μmの生成形体シ
ートを作製した。Then, the slurry was applied on a polyethylene terephthalate (PET) film by a doctor blade method, and dried to produce a 105 μm thick formed sheet.
【００７０】このような生成形体シートを熱処理後の寸
法が１８φになるように円状に打ち抜き、大気中にて５
００〜８００℃で熱処理を行った。これにより、活物質
充填率が５０％の電極を得た。得られた電極厚みはそれ
ぞれ８０μｍであった。Such a formed sheet is punched out in a circular shape so that the dimension after heat treatment becomes 18φ, and the sheet
Heat treatment was performed at 00 to 800 ° C. Thus, an electrode having an active material filling rate of 50% was obtained. The thickness of each of the obtained electrodes was 80 μm.
【００７１】電解液は、プロピレンカーボネート（Ｐ
Ｃ）と、１,２−ジメトキシエタン（ＤＭＥ）を体積比
１：１の割合で混合した溶媒に過塩素酸リチウム(ＬiＣ
lＯ4)を１モル／ｌで溶解させた有機電解液を用いた。The electrolyte was propylene carbonate (P
C) and 1,2-dimethoxyethane (DME) at a volume ratio of 1: 1 in a solvent mixed with lithium perchlorate (LiC).
An organic electrolyte in which (lO 4 ) was dissolved at 1 mol / l was used.
【００７２】セパレータとしては上記有機電解液を含浸
させたポリプロピレン繊維製の不織布を用いた。負極に
は金属リチウム箔を用いた。As the separator, a nonwoven fabric made of polypropylene fibers impregnated with the above organic electrolyte was used. A metal lithium foil was used for the negative electrode.
【００７３】得られた活物質充填率の焼結体電極を正極
３として導電性接着剤からなる正極集電体２により正極
缶１内に収め、上記セパレータを正極３上に配置し、負
極側は負極７として用いる金属リチウム箔を直接負極缶
５に貼りつけることで集電を行った。The obtained sintered body electrode having the active material filling rate is housed in a positive electrode can 1 with a positive electrode current collector 2 made of a conductive adhesive as a positive electrode 3, and the separator is placed on the positive electrode 3. In this case, current collection was performed by directly attaching a metal lithium foil used as the negative electrode 7 to the negative electrode can 5.
【００７４】上記正極缶１と負極缶５を絶縁パッキン８
を介してかしめ合わせ、コイン型電池セルを組み立て
た。The positive electrode can 1 and the negative electrode can 5 are separated from each other by an insulating packing 8.
To form a coin-type battery cell.
【００７５】（例６）活物質充填率を６５％にしたこと
以外は（例５）と同じ方法でコイン型電池セルを組み立
てた。(Example 6) A coin-type battery cell was assembled in the same manner as in (Example 5) except that the filling rate of the active material was 65%.
【００７６】（例７）活物質充填率を８０％にしたこと
以外は（例５）と同じ方法でコイン型電池セルを組み立
てた。(Example 7) A coin-type battery cell was assembled in the same manner as in (Example 5) except that the active material filling rate was set to 80%.
【００７７】（比較例３）活物質充填率を４０％にした
こと以外は（例５）と同じ方法でコイン型電池セルを組
み立てた。Comparative Example 3 A coin-type battery cell was assembled in the same manner as in (Example 5) except that the active material filling rate was set to 40%.
【００７８】（比較例４）活物質充填率を９０％にした
こと以外は（例５）と同じ方法でコイン型電池セルを組
み立てた。Comparative Example 4 A coin-type battery cell was assembled in the same manner as in (Example 5) except that the active material filling rate was 90%.
【００７９】これら各電池セルについて、充放電電流密
度：０．２mＡ／cm2、充放終止電圧：２．０Ｖ、放電終
止電圧1．２Ｖの条件下で充放電試験を行った。それら
の結果を表２に示す。Each of these battery cells was subjected to a charge / discharge test under the conditions of a charge / discharge current density: 0.2 mA / cm 2 , a charge / discharge end voltage: 2.0 V, and a discharge end voltage: 1.2 V. Table 2 shows the results.
【００８０】[0080]
【表２】 [Table 2]
【００８１】表２から明らかな通り、比較例３の活物質
充填率が４０％の電極を用いたセルは、容量が小さい。
また、放電容量に対する充電容量、つまり充放電効率が
悪く、５０％である。As is clear from Table 2, the cell of Comparative Example 3 using the electrode having the active material filling rate of 40% has a small capacity.
Further, the charge capacity relative to the discharge capacity, that is, the charge / discharge efficiency is poor, that is, 50%.
【００８２】これに対し、本発明に係る例５、例６、例
２、例７のセルは、充放電効率が極めて良く、９０〜９
６％に達している。特に例６、例２のセルにおいては、
容量、充放電効率の双方とも高く、他のセルと比較して
内部抵抗も低減されていることがわかる。これは、活物
質充填率が向上することによって活物質粒子間の接合が
改善され、電子の移動、イオンの移動が速やかに行える
電気的接触が構築されていることを示している。On the other hand, the cells of Examples 5, 6, 6, and 7 according to the present invention have extremely good charge / discharge efficiency,
It has reached 6%. In particular, in the cells of Examples 6 and 2,
It can be seen that both the capacity and the charging / discharging efficiency are high, and the internal resistance is reduced as compared with other cells. This indicates that the improvement in the filling ratio of the active material improves the bonding between the active material particles, and establishes an electrical contact capable of promptly transferring electrons and ions.
【００８３】比較例４においては容量、充放電効率供に
低い値となっている。これは高い活物質充填率を得るた
めの高温焼成による活物質の劣化、具体的には結晶構造
の変化が原因と考えられる。In Comparative Example 4, the capacity and the charge / discharge efficiency are low. This is considered to be caused by deterioration of the active material due to high-temperature firing for obtaining a high active material filling rate, specifically, a change in crystal structure.
【００８４】従って、活物質充填率は５０〜８０％、好
ましくは６５〜８０％とすることで活物質粒子間の接触
面積が増し、実用十分な電子伝導性が得られる。Therefore, by setting the active material filling rate to 50 to 80%, preferably 65 to 80%, the contact area between the active material particles increases, and practically sufficient electron conductivity can be obtained.
【００８５】なお、前記実施例では、活物質としてLi4T
i5O12を用いた例について説明したが、これのみに限定
されるものではなく、本発明者は、Li1+xMn2-xO4（０≦
x≦０．２）、LiMn2-yMeyO4（Me＝Ni、Cr、Cu、Zn、０
＜y≦０．６）、Li4Mn5O12を用いても同様な結果が得ら
れたことを種々の実験により確認した。In the above embodiment, Li 4 T was used as the active material.
Although an example using i 5 O 12 has been described, the present invention is not limited to this, and the present inventor has proposed that Li 1 + x Mn 2-x O 4 (0 ≦
x ≦ 0.2), LiMn 2-y Me y O 4 (Me = Ni, Cr, Cu, Zn, 0
<Y ≦ 0.6), various experiments confirmed that similar results were obtained using Li 4 Mn 5 O 12 .
【００８６】次に（例８）および（比較例５）、（比較
例６）を述べる。 （例８）マンガン酸リチウム（Li1.1Mn1.9O4）を正極活
物質、チタン酸リチウム（Li4Ti5O12）を負極活物質、
高分子固体電解質を電解質としてコイン型電池セルを作
製した。Next, (Example 8), (Comparative Example 5) and (Comparative Example 6) will be described. (Example 8) Lithium manganate (Li 1.1 Mn 1.9 O 4 ) as a positive electrode active material, lithium titanate (Li 4 Ti 5 O 12 ) as a negative electrode active material,
A coin-type battery cell was prepared using a polymer solid electrolyte as an electrolyte.
【００８７】以下に詳細を記すと、水酸化リチウムと二
酸化マンガンをLiとMnのモル比が1.1：1.9となるように
混合し、この混合物を大気中の６５０℃で１５時間加熱
合成することによりリチウムマンガン複合酸化物（Li
1.1Mn1.9O4）を調整した。The details are as follows. Lithium hydroxide and manganese dioxide are mixed so that the molar ratio of Li and Mn is 1.1: 1.9, and this mixture is heated and synthesized at 650 ° C. in the atmosphere for 15 hours. Lithium manganese composite oxide (Li
1.1 Mn 1.9 O 4 ) was adjusted.
【００８８】次に、この焼成粉末に成形助剤、可塑剤、
分散剤、溶剤を加えて混合してスラリーを調整した。Next, a molding aid, a plasticizer,
A slurry was prepared by adding and mixing a dispersant and a solvent.
【００８９】このスラリーをポリエチレンテレフタレー
ト（PET）フィルム上にドクターブレード法にて塗布し
た後、乾燥させて厚さ１１０μmの生成形体シートを作
製した。The slurry was applied on a polyethylene terephthalate (PET) film by a doctor blade method, and then dried to produce a 110 μm thick formed sheet.
【００９０】この生成形体シートを熱処理後の寸法が１
８φになるように円状に打ち抜き、大気中にて６５０℃
で熱処理を行った。得られた焼結体電極（正極３）の厚
みは９０μm、活物質充填率は６０％であった。The size of this formed sheet after heat treatment was 1
Punched in a circle so that the diameter becomes 8φ, and 650 ° C in air
Heat treatment was performed. The thickness of the obtained sintered body electrode (positive electrode 3) was 90 μm, and the active material filling rate was 60%.
【００９１】負極７には実施例２の電極を用いた。The electrode of Example 2 was used for the negative electrode 7.
【００９２】高分子固体電解質はポリエチレンオキシド
（PEO）骨格を有する高分子にリチウム塩として４フッ
化硼素リチウム（LiBF4）を溶解させたものを用いた。As the polymer solid electrolyte, one obtained by dissolving lithium boron tetrafluoride (LiBF 4 ) as a lithium salt in a polymer having a polyethylene oxide (PEO) skeleton was used.
【００９３】このようにして作製した正極３、負極７の
表面にこの高分子固体電解質を塗布し、両極を貼り合せ
た。この正極３、高分子固体電解質（電解質４）、負極
７の３層積層体を正極缶１、負極缶５、絶縁パッキン８
を用いてかしめ合わせ、コイン型電池セルを組み立て
た。This solid polymer electrolyte was applied to the surfaces of the positive electrode 3 and the negative electrode 7 thus produced, and both electrodes were bonded. The three-layer laminate of the positive electrode 3, the polymer solid electrolyte (electrolyte 4), and the negative electrode 7 is combined with a positive electrode can 1, a negative electrode can 5, an insulating packing 8.
To form a coin-type battery cell.
【００９４】（比較例５）正極に活物質充填率が４０％
の焼結体電極、負極に活物質充填率が４０％である比較
例３の焼結体電極を用いたこと以外は、（例８）と同じ
方法でコイン型電池セルを組み立てた。(Comparative Example 5) The positive electrode had an active material filling rate of 40%.
A coin-type battery cell was assembled in the same manner as in (Example 8) except that the sintered body electrode of Comparative Example 3 in which the active material filling rate was 40% was used as the sintered body electrode and the negative electrode.
【００９５】（比較例６）正極に厚みが１５μｍの焼結
体電極、負極に厚みが１０μｍである比較例１の焼結体
電極を用いたこと以外は、（例８）と同じ方法でコイン
型電池セルを組み立てた。Comparative Example 6 A coin was manufactured in the same manner as in Example 8 except that a sintered electrode having a thickness of 15 μm was used for the positive electrode and a sintered electrode of Comparative Example 1 having a thickness of 10 μm was used for the negative electrode. The battery cell was assembled.
【００９６】そして、各コイン型電池セルについて、
０．２ｍA／cm2電流値にて２．９V定電圧充電を２０時
間行い、その後０．０１mＡ／cm2、放電終止電圧1．２
Ｖとして充放電試験を行った。Then, for each coin-type battery cell,
2.9 V constant voltage charging was performed for 20 hours at a current value of 0.2 mA / cm 2 , and then 0.01 mA / cm 2 and a discharge end voltage of 1.2.
A charge / discharge test was performed as V.
【００９７】その結果を表３に示す。Table 3 shows the results.
【００９８】[0098]
【表３】 [Table 3]
【００９９】表３から明らかな通り、（例８）のように
本発明の範囲内である電極厚み、活物質充填率の正極、
負極を用いたコイン型電池セルは容量が大きいが、これ
に対し、活物質充填率が本発明範囲外である比較例５、
電極厚みが本発明範囲外である比較例６は著しく容量が
小さい。As is clear from Table 3, as shown in (Example 8), the positive electrode having the electrode thickness and active material filling rate within the scope of the present invention,
Comparative Example 5 in which the coin-type battery cell using the negative electrode has a large capacity, whereas the active material filling rate is out of the range of the present invention,
Comparative Example 6, in which the electrode thickness is out of the range of the present invention, has a remarkably small capacity.
【０１００】[0100]
【発明の効果】以上の通り、本発明のリチウム電池によ
れば、一対の電極でもって、その間に電解質を挟持する
構造において、前記電極の厚みを２０μｍを超えかつ２
００μｍ以下に設定したことで、高エネルギー密度のリ
チウム電池が得られ、さらに活物質充填率５０〜８０％
とすることで粒子同士の接触面積が増加し、接合が改善
され、電子伝導助剤を使用しなくても十分な電子伝導性
が得られ、その結果、充放電特性に優れたリチウム電池
が得られた。As described above, according to the lithium battery of the present invention, in a structure in which an electrolyte is interposed between a pair of electrodes, the thickness of the electrodes exceeds 20 μm and the
By setting the thickness to not more than 00 μm, a lithium battery having a high energy density can be obtained, and the active material filling rate is 50 to 80%.
As a result, the contact area between the particles increases, the bonding is improved, and sufficient electron conductivity is obtained without using an electron conduction auxiliary agent. As a result, a lithium battery having excellent charge / discharge characteristics is obtained. Was done.
【図１】本発明のリチウム電池の断面図である。FIG. 1 is a sectional view of a lithium battery of the present invention.
１…正極缶 ２…正極集電体 ３…正極 ４…電解質 ５…負極缶 ６…負極集電体 ７…負極 ８…絶縁パッキング DESCRIPTION OF SYMBOLS 1 ... Positive electrode can 2 ... Positive electrode collector 3 ... Positive electrode 4 ... Electrolyte 5 ... Negative electrode can 6 ... Negative electrode current collector 7 ... Negative electrode 8 ... Insulating packing
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H024 AA01 AA12 CC03 DD14 FF15 FF16 FF19 FF31 HH00 HH01 HH13 5H029 AJ03 AJ14 AK03 AL12 AM02 AM03 AM04 AM05 AM07 AM16 BJ03 BJ12 DJ06 EJ12 HJ02 HJ04 HJ09 5H050 AA08 AA19 BA06 BA16 BA17 CA07 CA08 CA09 CB12 DA02 FA02 HA02 HA04 HA09 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H024 AA01 AA12 CC03 DD14 FF15 FF16 FF19 FF31 HH00 HH01 HH13 5H029 AJ03 AJ14 AK03 AL12 AM02 AM03 AM04 AM05 AM07 AM16 BJ03 BJ12 DJ06 EJ12 HJ02 HJ04 BA07A07 A07BA CA09 CB12 DA02 FA02 HA02 HA04 HA09
Claims (2)
持するリチウム電池において、前記電極を活物質の充填
率が５０〜８０％である焼結体でもって板状に構成し、
その厚みは２０μｍを超えかつ２００μｍ以下に設定し
たことを特徴とするリチウム電池。1. A lithium battery comprising a pair of electrodes and an electrolyte interposed therebetween, wherein said electrodes are formed in a plate shape with a sintered body having an active material filling factor of 50 to 80%,
A lithium battery having a thickness of more than 20 μm and not more than 200 μm.
２）、LiMn2-yMeyO4（Me＝Ni、Cr、Cu、Zn、０＜y≦
０．６）、Li4Ti5O12、Li4Mn5O12よりなる群から選択し
た少なくとも１種から成ることを特徴とする請求項１記
載のリチウム電池。2. The method according to claim 1, wherein the active material is Li 1 + x Mn 2-x O 4 (0 ≦ x ≦ 0.
2), LiMn 2-y Me y O 4 (Me = Ni, Cr, Cu, Zn, 0 <y ≦
0.6), Li 4 Ti 5 O 12, Li 4 Mn 5 lithium battery according to claim 1, wherein the O 12, characterized in that it consists of at least one selected from the group consisting of.
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| JP2000220683A JP2002042785A (en) | 2000-07-21 | 2000-07-21 | Lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000220683A JP2002042785A (en) | 2000-07-21 | 2000-07-21 | Lithium battery |
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| Publication Number | Publication Date |
|---|---|
| JP2002042785A true JP2002042785A (en) | 2002-02-08 |
Family
ID=18715243
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|---|---|---|---|
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| Country | Link |
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