JPH04124290A - Production of manganese dioxide - Google Patents
Production of manganese dioxideInfo
- Publication number
- JPH04124290A JPH04124290A JP2242522A JP24252290A JPH04124290A JP H04124290 A JPH04124290 A JP H04124290A JP 2242522 A JP2242522 A JP 2242522A JP 24252290 A JP24252290 A JP 24252290A JP H04124290 A JPH04124290 A JP H04124290A
- Authority
- JP
- Japan
- Prior art keywords
- electrolytic
- soln
- manganese dioxide
- manganese
- 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.)
- Pending
Links
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 11
- 239000003792 electrolyte Substances 0.000 claims description 10
- 150000002696 manganese Chemical class 0.000 claims description 7
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011572 manganese Substances 0.000 abstract description 8
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- 239000010935 stainless steel Substances 0.000 abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 6
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 239000011149 active material Substances 0.000 abstract 1
- 238000002386 leaching Methods 0.000 abstract 1
- 238000010979 pH adjustment Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 11
- 239000007774 positive electrode material Substances 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 7
- 239000008151 electrolyte solution Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- -1 ferrous metals Chemical class 0.000 description 4
- 229910000733 Li alloy Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000001989 lithium alloy Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229940099596 manganese sulfate Drugs 0.000 description 2
- 235000007079 manganese sulphate Nutrition 0.000 description 2
- 239000011702 manganese sulphate Substances 0.000 description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011255 nonaqueous electrolyte Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000002867 manganese chloride Nutrition 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- 229940099607 manganese chloride Drugs 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Inert Electrodes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えばマンガン電池またはリチウムマンガン
電池などの正極活物質として使用される二酸化マンガン
の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing manganese dioxide, which is used as a positive electrode active material in, for example, manganese batteries or lithium manganese batteries.
二酸化マンガンは、保存性に優れかつ安価であるなどの
理由でマンガン電池またはアルカリマンガン電池の正極
活物質として汎用されているが、その−船釣な製造にあ
たっては、硫酸マンガンおよび硫酸溶液を電解液に使用
して電解を行っており、この電解液のｐＨは、前述した
ように硫酸溶液を使用しているため、通常、ｐＨ１未満
て約１．３Ｖ （ｖｓ ＮＨＥ）以上の電解となる。Manganese dioxide is widely used as a positive electrode active material for manganese batteries or alkaline manganese batteries because of its excellent storage stability and low cost. Since the sulfuric acid solution is used as described above, the pH of this electrolytic solution is usually less than 1 and the electrolysis is about 1.3 V (vs NHE) or higher.
ところで、前述したように電解液のｐＨは、硫酸溶液の
使用しより、通常、ｐＨ１以下となっているため、この
二酸化マンガンの製造に使用される電解基板は、耐酸性
に優れたチタンやカーボンなどに限定されていた。By the way, as mentioned above, the pH of the electrolytic solution is usually less than 1 compared to when a sulfuric acid solution is used, so the electrolytic substrate used for manufacturing manganese dioxide is made of titanium or carbon, which has excellent acid resistance. etc. was limited.
本発明は、このような従来技術を背景になされたもので
、不錆鋼などの耐酸性に劣る素材からなる電解基板の使
用ができる二酸化マンガンの製造方法を提供することを
目的とする。The present invention was made against the background of such conventional technology, and an object of the present invention is to provide a method for manufacturing manganese dioxide that allows the use of an electrolytic substrate made of a material with poor acid resistance, such as rust-free steel.
本発明は、ｐＨ２〜６に調整されたマンガン塩水溶液を
電解液として電解を行うことを特徴とする二酸化マンガ
ンの製造方法を提供するものである。The present invention provides a method for producing manganese dioxide, which is characterized in that electrolysis is performed using an aqueous manganese salt solution adjusted to pH 2 to 6 as an electrolyte.
本発明でいうマンガン塩水溶液としては、例えば硫酸マ
ンガン水溶液、塩化マンガン水溶液、硝酸マンガン水溶
液などが挙げられる。Examples of the manganese salt aqueous solution in the present invention include manganese sulfate aqueous solution, manganese chloride aqueous solution, manganese nitrate aqueous solution, and the like.
電解液中のマンガン濃度は、０．５〜４モル／！、特に
１〜２モル／！が好ましく、０．１モル／！未満では電
解、析出できず、一方４モル／ｌを超えると利用率が低
下する。The manganese concentration in the electrolyte is 0.5 to 4 mol/! , especially 1-2 mol/! is preferably 0.1 mol/! If it is less than 4 mol/l, electrolysis and precipitation will not be possible, while if it exceeds 4 mol/l, the utilization rate will decrease.
電解液のｐＨは、ｐＨ２〜６、特にｐＨ４〜５が好まし
く、ｐＨ２未満では耐酸性に劣る素材からなる電解基板
の溶出が起こり、一方ｐＨ６を超えると二酸化マンガン
は生成しない。The pH of the electrolytic solution is preferably 2 to 6, particularly 4 to 5. If the pH is less than 2, the electrolytic substrate made of a material with poor acid resistance will elute, whereas if the pH exceeds 6, no manganese dioxide will be produced.
この電解液のｐＨの調整は、例えば硫酸溶液に水酸化リ
チウム溶液を加えることにより行われる。The pH of the electrolytic solution is adjusted, for example, by adding a lithium hydroxide solution to a sulfuric acid solution.
正負の電極としては、このように電解液のＰＨがｐＨ２
〜６に調整されているために、従来使用されているチタ
ンやカーボンのほか、例えばステンレスなどの不ｗｊ綱
のような耐酸性に劣る素材からなる電解基板の使用もで
きる。As the positive and negative electrodes, the pH of the electrolyte is pH2 in this way.
6, it is possible to use electrolytic substrates made of materials with poor acid resistance, such as stainless steel and other non-ferrous metals, in addition to the conventionally used titanium and carbon.
また、二酸化マンガンの電解条件としては、収量を増加
させるために８０〜９５°Ｃ′Ｃに加熱し、また電解電
位を二酸化マンガンの生成電位である１Ｖ−１，４Ｖ（
ｖｓ ＮＨＥ）に設定し、二酸化マンガンの製造を行
い、製造後、合成時の歪み、ストレス、粒塊を餘去する
ために、大気中で２５０〜３５０°Ｃで熱処理すること
が好ましい。In addition, the electrolytic conditions for manganese dioxide include heating to 80 to 95°C'C to increase the yield, and the electrolytic potential is 1V - 1.4V (which is the production potential of manganese dioxide).
vs. NHE) to produce manganese dioxide, and after production, it is preferable to heat-treat at 250 to 350°C in the atmosphere to remove distortion, stress, and agglomerates during synthesis.
このように、ｐＨ２〜６に調整されたマンガン塩水溶液
を電解液に用いて電解を行うことで、例えば不錆鋼など
の耐酸性に劣る素材からなる電解基板の使用ができる。By performing electrolysis using an aqueous manganese salt solution adjusted to pH 2 to 6 as an electrolytic solution in this manner, it is possible to use an electrolytic substrate made of a material with poor acid resistance, such as rust-free steel.
なお、例えばマンガン電池などの正極基板として一般使
用されている前記ステンレス製の基板に、直接、二酸化
マンガンを生成できるために、この二酸化マンガンの皮
膜ができた電解基板を、直接、正極として使用したり、
またこの二酸化マンガンの皮膜を正極集電体として、該
皮膜上にさらに正極活物質を積層してより良好な放電容
量を有するものとなすこともできる。Furthermore, since manganese dioxide can be generated directly on the stainless steel substrate, which is generally used as a positive electrode substrate for manganese batteries, the electrolytic substrate on which this manganese dioxide film has been formed can be used directly as a positive electrode. Or,
Further, this manganese dioxide film can be used as a positive electrode current collector, and a positive electrode active material can be further laminated on the film to have better discharge capacity.
次に、本発明の製造方法により製造された二酸化マンガ
ンを用いるリチウムマンガン二次電池を説明する。Next, a lithium manganese secondary battery using manganese dioxide produced by the production method of the present invention will be described.
すなわち、本発明の正極活物質を使用したリチウムマン
ガン二次電池は、まずマンガン塩水溶液を電解液とし、
かつステンレス製の電解基板を使用して電解を行うこと
で、第１図に示す裏面に二酸化マンガンからなる正極活
物質の皮膜１０を積層した正極板２０を設けて正極３０
を形成し、そののちこの正極板２０と、ステンレス製の
負極板４０とをエポキシ樹脂からなる側面封止材５０を
介して離反状態に配置し、一方この負極板４０の裏面側
にリチウム合金からなる負極活物質６０を圧着して負極
７０を形成し、しかもこれらの正極活物質の皮膜１０と
負極活物質６０との間にセパレータ８０を介在させたも
のである。That is, in a lithium manganese secondary battery using the positive electrode active material of the present invention, first, a manganese salt aqueous solution is used as an electrolyte,
By performing electrolysis using a stainless steel electrolytic substrate, a positive electrode plate 20 having a positive electrode active material film 10 made of manganese dioxide laminated on the back side shown in FIG. 1 is provided, and a positive electrode 30 is formed.
After that, the positive electrode plate 20 and the negative electrode plate 40 made of stainless steel are placed in a separated state through the side sealing material 50 made of epoxy resin, and on the other hand, a lithium alloy is formed on the back side of the negative electrode plate 40. The negative electrode 70 is formed by pressing together negative electrode active materials 60, and a separator 80 is interposed between the film 10 of these positive electrode active materials and the negative electrode active material 60.
なお、負極活物質６０として使用されるリチウム合金と
しては、リチウムを含むＩＩａ、ｎｂ、ｍｂ、ｒｖｂ、
ｖｂ族の金属またはその２種以上の合金が使用可能であ
るが、特にリチウムを含むＡｊ！、Ｉｎ５Ｓｎ、Ｐｂ、
Ｂｉ、Ｃｄ、Ｚｎまたはこれらの２種以上の合金が好ま
しく、また正極活物質の皮膜１０中にも含有可能な汎用
されている非水電解質を含んでいる。Note that lithium alloys used as the negative electrode active material 60 include IIa, nb, mb, rvb, and lithium-containing lithium alloys.
Vb group metals or alloys of two or more thereof can be used, especially Aj! containing lithium! , In5Sn, Pb,
Bi, Cd, Zn, or an alloy of two or more of these is preferable, and includes a commonly used nonaqueous electrolyte that can also be contained in the film 10 of the positive electrode active material.
前記セパレータ８０としては、シート状の高分子架橋体
に電解質を含浸させてなるゲル状電解質から構成された
ものや、−船便用されている多孔質で電解液を通したり
含んだりすることのできる、例えばポリテトラフルオロ
エチレン、ポリプロピレンやポリエチレンなどの合成樹
脂製の不織布、織布および編布などを使用することがで
きる。The separator 80 may be made of a gel-like electrolyte obtained by impregnating a sheet-like polymeric cross-linked material with an electrolyte, or a porous material used by ships that can pass or contain an electrolyte. For example, nonwoven fabrics, woven fabrics, and knitted fabrics made of synthetic resins such as polytetrafluoroethylene, polypropylene, and polyethylene can be used.
本発明の二酸化マンガンの製造方法は、まずｐＨ２〜６
に調整されたマンガン塩水溶液を設け、そののちこのマ
ンガン塩水溶液を電解液として電解を行うことで、不錆
鋼などの耐酸性に劣る素材からなる電解基板を使用する
ことができ、得られる電解二酸化マンガンは正極活物質
として優れている。The method for producing manganese dioxide of the present invention starts with pH 2 to 6.
By providing an aqueous manganese salt solution adjusted to Manganese dioxide is an excellent positive electrode active material.
以下、本発明の詳細な説明するが、本発明はこれらの実
施例に限定されない。The present invention will be described in detail below, but the present invention is not limited to these Examples.
実施例１
加温装置を設けた電解槽内に、正極および負極として５
ＵＳ３０４製の基板をそれぞれ交互に懸吊し、電解槽の
底部に電解液として、トータル液量が６００Ｍ！で、か
つｐＨ５の硫酸マンガンの１モル水溶液を入れ、１．２
Ｖ （ｖｓ、 Ａｇ／ＡｇＣｆ）の定電位電解を室温で
１５時間行い、正極に電解二酸化マンガンを生成させた
。Example 1 In an electrolytic cell equipped with a heating device, 5 cells were placed as a positive electrode and a negative electrode.
The US304 substrates are suspended alternately, and the electrolyte is placed at the bottom of the electrolytic cell for a total liquid volume of 600M! and add a 1 molar aqueous solution of manganese sulfate with a pH of 5 to 1.2
Constant potential electrolysis of V (vs, Ag/AgCf) was performed at room temperature for 15 hours to generate electrolytic manganese dioxide at the positive electrode.
この際、電解液のｐＨは２に低下しており、電流の消費
量は１，０５０クーロンであった。At this time, the pH of the electrolytic solution had decreased to 2, and the current consumption was 1,050 coulombs.
得られた電解二酸化マンガンを取り出し、８０°Ｃで１
０時間の真空乾燥を行ってから、２５０〜３５０°Ｃで
４時間の熱処理を行った。The obtained electrolytic manganese dioxide was taken out and heated at 80°C for 1
After performing vacuum drying for 0 hours, heat treatment was performed at 250 to 350°C for 4 hours.
得られた二酸化マンガンおよび比較用市販品の二酸化マ
ンガンを、それぞれＭｎ０ｚ／アセチレンブラツク／テ
フロンバインダー＝８／１／１の重量比で混合してφ１
５＋＋ａのペレットを作製し、放電容量を測定した。す
なわち、密閉型ガラスビーカーセル中に、非水電解質と
して１モルＬｉＣｌ！、０４のＰＣ／ＤＭＥ溶液（プロ
ピレンカーボネート／ジメトキシエタン（重量比）−１
／１）を入れ、作用極として前記ベレットをクリップで
吊るしたものを用い、対極としてポーラスカーボンを使
用し、参照極としてはＡｇ／ＡｇＣｆを使用した。ここ
で、放電電流として５ｍＡの一定電流を流して、放電終
止電位が−ＩＶ ｖｓＡｇ／ＡｇＣｆｆ１を示すまで
の放電容量を測定した。The obtained manganese dioxide and a commercially available manganese dioxide for comparison were mixed at a weight ratio of Mn0z/acetylene black/Teflon binder = 8/1/1, and φ1
5++a pellets were prepared and the discharge capacity was measured. That is, 1 mol LiCl! as a non-aqueous electrolyte in a closed glass beaker cell. , 04 PC/DME solution (propylene carbonate/dimethoxyethane (weight ratio) -1
/1), the pellet suspended with a clip was used as a working electrode, porous carbon was used as a counter electrode, and Ag/AgCf was used as a reference electrode. Here, a constant current of 5 mA was passed as a discharge current, and the discharge capacity was measured until the discharge end potential showed -IV vsAg/AgCff1.
その結果、放電容量は、市販品が１８５Ａｈ／眩である
のに対し、本発明品は該市販品と同程度（７）１８４Ａ
ｈ／ｋｇの放電容量が得られた。As a result, the discharge capacity of the commercially available product was 185Ah/dazzle, whereas the product of the present invention had a discharge capacity of 184Ah (7), which was the same as that of the commercially available product.
A discharge capacity of h/kg was obtained.
実施例２
二酸化マンガンの合成にあたって、９０℃で２〜３時間
の定電位電解を行って（電流の消費量＝３．５００クー
ロン）、二酸化マンガンを電解合成し、生成後の熱処理
を行わない以外は、実施例１と同様にして放電容量の測
定を行った。Example 2 Manganese dioxide was electrolytically synthesized by performing constant potential electrolysis at 90°C for 2 to 3 hours (current consumption = 3.500 coulombs), and no heat treatment was performed after production. The discharge capacity was measured in the same manner as in Example 1.
その結果、２０５Ａｈ／）ｃｇの良好な放電容量が得ら
れた。As a result, a good discharge capacity of 205Ah/)cg was obtained.
実施例３
電解合成した二酸化マンガンを２５０〜３５０°Ｃで４
時間の熱処理を行った以外は、実施例２と同様にして二
酸化マンガンを合成し、放電容量の測定を行った。その
結果、２６７Ａｈ／ｋｇと、さらに良好な放電容量が得
られた。Example 3 Electrolytically synthesized manganese dioxide was heated at 250 to 350°C.
Manganese dioxide was synthesized in the same manner as in Example 2, except that the heat treatment was performed for a period of time, and the discharge capacity was measured. As a result, an even better discharge capacity of 267 Ah/kg was obtained.
本発明の二酸化マンガンの製造方法は、このようにｐＨ
２〜６に調整されたマンガン塩水溶液を電解液として電
解を行うことで、不錆鋼などの耐酸性に劣る素材からな
る電解基板の使用ができ、しかも正極活物質として優れ
た電解二酸化マンガンが得られる。In the method for producing manganese dioxide of the present invention, the pH
By performing electrolysis using a manganese salt aqueous solution adjusted to 2 to 6 as an electrolyte, it is possible to use electrolytic substrates made of materials with poor acid resistance, such as rust-free steel, and electrolytic manganese dioxide, which is excellent as a positive electrode active material, can be used. can get.
第１図は本発明の二酸化マンガンの製造方法により得た
リチウム二次電池の断面図である。
１０；正極活物質の皮膜
２０；正極板
特許出願人 本田技研工業株式会社
代理人 弁理士 白 井 重 隆
第
図FIG. 1 is a cross-sectional view of a lithium secondary battery obtained by the method for producing manganese dioxide of the present invention. 10; Film of positive electrode active material 20; Positive electrode plate patent applicant: Honda Motor Co., Ltd., agent, patent attorney, Takashi Shirai, Figure
Claims (1)
液として電解を行うことを特徴とする二酸化マンガンの
製造方法。(1) A method for producing manganese dioxide, which comprises carrying out electrolysis using an aqueous manganese salt solution adjusted to pH 2 to 6 as an electrolyte.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2242522A JPH04124290A (en) | 1990-09-14 | 1990-09-14 | Production of manganese dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2242522A JPH04124290A (en) | 1990-09-14 | 1990-09-14 | Production of manganese dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04124290A true JPH04124290A (en) | 1992-04-24 |
Family
ID=17090362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2242522A Pending JPH04124290A (en) | 1990-09-14 | 1990-09-14 | Production of manganese dioxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04124290A (en) |
-
1990
- 1990-09-14 JP JP2242522A patent/JPH04124290A/en active Pending
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