JPH0864209A - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JPH0864209A JPH0864209A JP6198402A JP19840294A JPH0864209A JP H0864209 A JPH0864209 A JP H0864209A JP 6198402 A JP6198402 A JP 6198402A JP 19840294 A JP19840294 A JP 19840294A JP H0864209 A JPH0864209 A JP H0864209A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- binder
- lithium secondary
- positive electrode
- butyral resin
- 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.)
- Pending
Links
Classifications
-
- 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
Landscapes
- 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、小型電子機器の駆動用
電源として有用なリチウム２次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium secondary battery useful as a power source for driving small electronic equipment.
【０００２】[0002]
【従来の技術】近年、民生用電子機器のポータブル化、
コードレス化が急速に進んでおり、これら電子機器の駆
動用電源として、小型、軽量で高電圧、高エネルギー密
度を有する２次電池の開発が要望されている。そして、
このような要求性能を満たすべく、種々のリチウム２次
電池が提案されている。2. Description of the Related Art In recent years, portable electronic devices for consumer use,
The cordless technology is rapidly advancing, and there is a demand for the development of a small-sized, lightweight secondary battery having a high voltage and a high energy density as a power source for driving these electronic devices. And
Various lithium secondary batteries have been proposed to satisfy such required performance.
【０００３】このリチウム２次電池は、一般に、ＬｉＣ
ｏＯ2 またはＬｉＭｎ2 Ｏ4 等を活物質とする正極、カ
ーボン負極、および例えばプロピレンカーボネートとジ
メトキシエタンの混合溶媒に過塩素酸リチウムを溶解し
た非水系有機電解液とで構成されている。This lithium secondary battery is generally LiC.
It is composed of a positive electrode using oO 2 or LiMn 2 O 4 as an active material, a carbon negative electrode, and a non-aqueous organic electrolytic solution in which lithium perchlorate is dissolved in a mixed solvent of propylene carbonate and dimethoxyethane, for example.
【０００４】そして、従来、リチウム２次電池の正極
は、ポリ４フッ化エチレン（以下、ＰＴＦＥと称す）あ
るいはポリフッ化ビニリデン（以下、ＰＶＤＦと称す）
を結着剤として活物質に混ぜて成形して作製されてい
た。Conventionally, the positive electrode of a lithium secondary battery is polytetrafluoroethylene (hereinafter referred to as PTFE) or polyvinylidene fluoride (hereinafter referred to as PVDF).
It was produced by mixing with an active material as a binder and molding.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
リチウム２次電池は、樹脂のなかでは比較的比重の大き
いＰＴＦＥやＰＶＤＦを正極の結着剤として用いている
ため、電池の重量エネルギー密度（重量効率）向上の妨
げとなっていた。However, since the conventional lithium secondary battery uses PTFE or PVDF, which has a relatively large specific gravity among resins, as a binder for the positive electrode, the weight energy density (weight) of the battery is It was a hindrance to improving efficiency.
【０００６】また、ＰＴＦＥのような粉末状の結着剤を
用いる場合は、結着剤と活物質との均一分散が困難なた
めに、活物質を均一に結着させるのに、比較的多量の結
着剤を用いなければならなかった。Further, when a powdery binder such as PTFE is used, it is difficult to uniformly disperse the binder and the active material. Therefore, a relatively large amount is required to uniformly bond the active material. Had to be used.
【０００７】そこで、本発明の目的は、充放電サイクル
特性に優れ、重量エネルギー密度が高いリチウム２次電
池を提供することにある。Therefore, an object of the present invention is to provide a lithium secondary battery having excellent charge / discharge cycle characteristics and a high weight energy density.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明のリチウム２次電池は、リチウム含有酸化物
からなる正極と、非水電解液と、負極とからなり、前記
正極の結着剤はブチラール樹脂からなることを特徴とす
る。In order to achieve the above object, a lithium secondary battery of the present invention comprises a positive electrode made of a lithium-containing oxide, a non-aqueous electrolyte and a negative electrode. The agent is characterized by comprising butyral resin.
【０００９】[0009]
【作用】リチウム２次電池の正極の結着剤として用いる
ブチラール樹脂の比重は１．１と、従来結着剤として用
いられていたＰＴＦＥの２．７、ＰＶＤＦの１．７と比
較して小さい。このため、同じ重量比率で活物質と混合
した場合、正極中の結着剤の体積比率が従来より増加す
る。したがって、活物質を結着する力が大となって正極
中の活物質の脱落が少なくなり、リチウム２次電池の充
放電サイクル特性が向上する。The specific gravity of the butyral resin used as the binder of the positive electrode of the lithium secondary battery is 1.1, which is smaller than the 2.7 of PTFE and 1.7 of PVDF which have been conventionally used as the binder. . Therefore, when mixed with the active material in the same weight ratio, the volume ratio of the binder in the positive electrode is higher than in the conventional case. Therefore, the force for binding the active material is large, and the active material in the positive electrode is less likely to fall off, and the charge / discharge cycle characteristics of the lithium secondary battery are improved.
【００１０】また、ブチラール樹脂は溶剤に可溶性のた
め、溶液状態で添加できて分散性がよく、従来のＰＴＦ
Ｅ等の粉末の結着剤より少ない添加割合で同等の結着力
が得られる。したがって、添加する結着剤量を減少させ
ることができ、リチウム２次電池の重量エネルギー密度
が向上する。Also, since butyral resin is soluble in a solvent, it can be added in a solution state and has good dispersibility.
An equivalent binding force can be obtained with a smaller addition ratio than the powdery binder such as E. Therefore, the amount of the binder to be added can be reduced, and the weight energy density of the lithium secondary battery is improved.
【００１１】[0011]
（実施例）以下、本発明のリチウム２次電池について、
その実施例を説明する。(Example) Hereinafter, regarding the lithium secondary battery of the present invention,
The embodiment will be described.
【００１２】図１は、本発明の一実施例により得られる
コイン型電池の断面図である。同図において、１はステ
ンレス鋼板を加工した耐非水有機電解液性の電池ケー
ス、２は封口板、３は正極、４は負極、５はセパレー
タ、６は絶縁ガスケットである。FIG. 1 is a sectional view of a coin type battery obtained according to an embodiment of the present invention. In the figure, 1 is a non-aqueous organic electrolyte resistant battery case made by processing a stainless steel plate, 2 is a sealing plate, 3 is a positive electrode, 4 is a negative electrode, 5 is a separator, and 6 is an insulating gasket.
【００１３】次に、本発明のリチウム２次電池の製造方
法を説明する。まず、イソプロピルアルコール、エチル
アルコールおよびトルエンの混合溶媒１００重量部に、
ブチラール樹脂２０重量部を添加、溶解させて結着剤液
を作製した。次に、この結着剤液、導電剤としてのアセ
チレンブラックおよび活物質としてのＬｉＭｎ2 Ｏ
4 を、表１に示す割合になるように混合し、活物質スラ
リーを作製した。その後、厚さ１５μｍのアルミニウム
製集電体基板上に、このスラリーをドクターブレード法
によって厚さ２０μｍにコーティングし、正極シートを
形成した。Next, a method for manufacturing the lithium secondary battery of the present invention will be described. First, in 100 parts by weight of a mixed solvent of isopropyl alcohol, ethyl alcohol and toluene,
20 parts by weight of butyral resin was added and dissolved to prepare a binder solution. Next, this binder liquid, acetylene black as a conductive agent, and LiMn 2 O as an active material.
4 were mixed in the proportions shown in Table 1 to prepare an active material slurry. Then, this slurry was coated on a 15 μm-thick aluminum current collector substrate by a doctor blade method to a thickness of 20 μm to form a positive electrode sheet.
【００１４】次に、得られた正極シートを直径１７ｍｍ
の円板状に打ち抜き、２００℃で減圧乾燥して正極３と
した。Next, the obtained positive electrode sheet was prepared to have a diameter of 17 mm.
Was punched into a disk shape and dried under reduced pressure at 200 ° C. to obtain a positive electrode 3.
【００１５】その後、図１に示すように、上記正極３と
厚さ０．２４ｍｍのリチウム金属からなる負極４をポリ
プロピレン製セパレータ５（セルガード２５０２、ダイ
セル化学工業製）を介して電池ケース１内に収納した。
そして、電解液には、プロピレンカーボネートと１，２
−ジメトキシエタンの等容積混合溶液に、過塩素酸リチ
ウムを１モル／リットルの割合で溶解させたものを用い
た。その後、周囲を絶縁ガスケット６で電池ケース１と
絶縁した状態に封口板２で封口し、リチウム２次電池を
作製した。Then, as shown in FIG. 1, the positive electrode 3 and the negative electrode 4 made of lithium metal having a thickness of 0.24 mm are placed in a battery case 1 through a polypropylene separator 5 (Celguard 2502, manufactured by Daicel Chemical Industries). Stowed.
Then, the electrolytic solution contains propylene carbonate and 1,2
A solution obtained by dissolving lithium perchlorate in a mixed solution of equal volumes of dimethoxyethane at a rate of 1 mol / liter was used. After that, the periphery was insulated from the battery case 1 by the insulating gasket 6 and sealed with the sealing plate 2 to fabricate a lithium secondary battery.
【００１６】以上、得られたリチウム２次電池につい
て、初期容量を確認するとともに、充放電電流密度１ｍ
Ａ／ｃｍ2 、充電終止電圧４．５Ｖ、放電終止電圧３．
０Ｖの条件下で定電流充放電試験を行なった。表１に、
初期容量および充放電試験１００サイクル目の容量を理
論容量（１４８ｍＡｈ／ｇ）に対する比率で示す。With respect to the lithium secondary battery thus obtained, the initial capacity was confirmed, and the charge / discharge current density was 1 m.
A / cm 2 , charge end voltage 4.5 V, discharge end voltage 3.
A constant current charge / discharge test was performed under the condition of 0V. In Table 1,
The initial capacity and the capacity at the 100th cycle of the charge / discharge test are shown as a ratio to the theoretical capacity (148 mAh / g).
【００１７】（比較例）正極の結着剤としてブチラール
樹脂の代わりにＰＶＤＦまたはＰＴＦＥを用い、結着
剤、導電剤としてのアセチレンブラックおよび活物質と
してのＬｉＭｎ2Ｏ4を、表１に示す割合になるように混
合し、その他は実施例と同様にして、リチウム２次電池
を作製した。Comparative Example PVDF or PTFE was used in place of the butyral resin as the binder for the positive electrode, and the binder, acetylene black as the conductive agent, and LiMn 2 O 4 as the active material were used in the proportions shown in Table 1. A lithium secondary battery was produced in the same manner as in Example 1 except that the above components were mixed.
【００１８】その後、実施例と同様に、初期容量を確認
するとともに定電流充放電試験を行なった。表１に、初
期容量および充放電試験１００サイクル目の容量を理論
容量（１４８ｍＡｈ／ｇ）に対する比率で示す。Then, in the same manner as in the example, the initial capacity was confirmed and a constant current charge / discharge test was conducted. Table 1 shows the initial capacity and the capacity at the 100th cycle of the charge / discharge test as a ratio to the theoretical capacity (148 mAh / g).
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１の実施例に示す通り、本発明のブチラ
ール樹脂を正極の結着剤として用いたものは、比較例に
示すＰＶＤＦまたはＰＴＦＥを用いたものと比較して初
期容量が大きく、充放電試験後の容量の減少も少なく、
充放電サイクル特性に優れている。As shown in the examples of Table 1, the one using the butyral resin of the present invention as the binder for the positive electrode has a large initial capacity as compared with the one using PVDF or PTFE shown in the comparative example. Little decrease in capacity after discharge test,
Excellent charge / discharge cycle characteristics.
【００２１】なお、上記実施例は、本発明による一実施
例を示したもので、電極活物質、導電剤、集電体基板材
料、負極材料、電解液、セパレータ等は上記実施例に限
定されるものではなく、公知の材料を適宜用いることが
できる。The above embodiment is an embodiment according to the present invention, and the electrode active material, the conductive agent, the current collector substrate material, the negative electrode material, the electrolytic solution, the separator, etc. are limited to the above embodiment. However, a known material can be used as appropriate.
【００２２】[0022]
【発明の効果】以上の説明で明らかなように、正極の結
着剤としてブチラール樹脂を用いることにより、充放電
サイクル特性に優れ、重量エネルギー密度が高いリチウ
ム２次電池が得られる。As is clear from the above description, by using butyral resin as the binder for the positive electrode, a lithium secondary battery having excellent charge / discharge cycle characteristics and a high weight energy density can be obtained.
【図１】本発明の一実施例により得られるコイン型電池
の断面図である。FIG. 1 is a sectional view of a coin-type battery obtained according to an embodiment of the present invention.
１ ケース ２ 封口板 ３ 正極 ４ 負極 ５ セパレータ ６ 絶縁ガスケット 1 case 2 sealing plate 3 positive electrode 4 negative electrode 5 separator 6 insulating gasket
Claims (1)
水電解液と、負極とからなり、前記正極の結着剤はブチ
ラール樹脂からなることを特徴とするリチウム２次電
池。1. A lithium secondary battery comprising a positive electrode made of a lithium-containing oxide, a non-aqueous electrolyte, and a negative electrode, and a binder for the positive electrode made of butyral resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6198402A JPH0864209A (en) | 1994-08-23 | 1994-08-23 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6198402A JPH0864209A (en) | 1994-08-23 | 1994-08-23 | Lithium secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0864209A true JPH0864209A (en) | 1996-03-08 |
Family
ID=16390538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6198402A Pending JPH0864209A (en) | 1994-08-23 | 1994-08-23 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0864209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7381496B2 (en) | 2004-05-21 | 2008-06-03 | Tiax Llc | Lithium metal oxide materials and methods of synthesis and use |
-
1994
- 1994-08-23 JP JP6198402A patent/JPH0864209A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7381496B2 (en) | 2004-05-21 | 2008-06-03 | Tiax Llc | Lithium metal oxide materials and methods of synthesis and use |
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