JPH0521068A - Nonaqueous solvent secondary battery - Google Patents
Nonaqueous solvent secondary batteryInfo
- Publication number
- JPH0521068A JPH0521068A JP3175283A JP17528391A JPH0521068A JP H0521068 A JPH0521068 A JP H0521068A JP 3175283 A JP3175283 A JP 3175283A JP 17528391 A JP17528391 A JP 17528391A JP H0521068 A JPH0521068 A JP H0521068A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- lithium
- secondary battery
- positive electrode
- negative
- 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.)
- Granted
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、負極担持体として炭素
質物を用いた非水溶媒二次電池に関する。TECHNICAL FIELD The present invention relates to a non-aqueous solvent secondary battery using a carbonaceous material as a negative electrode carrier.
【０００２】[0002]
【従来の技術】近年、電子機器の発達に伴い、小型で軽
量、かつエネルギー密度が高く、さらに繰り返し充放電
が可能な二次電池の開発が要望されている。この種の二
次電池としては、負極活物質としてリチウム又はリチウ
ム合金を用い、正極活物質としてモリブデン、バナジウ
ム、チタン、ニオブなどの酸化物、硫化物、セレン化物
等を用いたものが知られている。また最近では、高エネ
ルギー密度を有するマンガン酸化物のサイクル特性を改
良・向上させたスピネル型ＬｉＭｎ2 Ｏ4 や、他のリチ
ウムマンガン酸化物についての検討が活発に行われてい
る。2. Description of the Related Art In recent years, with the development of electronic devices, there has been a demand for the development of a secondary battery that is small and lightweight, has a high energy density, and can be repeatedly charged and discharged. As a secondary battery of this type, one using lithium or a lithium alloy as a negative electrode active material and using an oxide such as molybdenum, vanadium, titanium, or niobium, a sulfide, or a selenide as a positive electrode active material is known. There is. In addition, recently, spinel-type LiMn 2 O 4 and other lithium manganese oxides having improved cycle characteristics of manganese oxide having a high energy density and other lithium manganese oxides have been actively studied.
【０００３】これらのリチウムマンガン酸化物を正極活
物質とし、リチウムを負極活物質とする二次電池系にお
いては、充放電サイクルを繰り返すことによって負極活
物質であるリチウムの溶解・析出反応が繰り返され、や
がてリチウム基板上に針状のリチウムデンドライト析出
物を形成するという問題が生じる。そのため、これら二
次電池系においては、正極活物質中で徐々に進行する結
晶構造の崩れとともに、負極側におけるリチウムデンド
ライトの生成と溶媒の分解反応によって電池寿命は規定
され、２００サイクル以上の寿命と長期間にわたる信頼
性を有する二次電池の製造は非常に困難であった。In a secondary battery system using these lithium manganese oxides as a positive electrode active material and lithium as a negative electrode active material, the dissolution / precipitation reaction of lithium as the negative electrode active material is repeated by repeating charge / discharge cycles. Then, a problem occurs that needle-like lithium dendrite precipitates are formed on the lithium substrate. Therefore, in these secondary battery systems, the battery life is regulated by the generation of lithium dendrite and the decomposition reaction of the solvent on the negative electrode side along with the collapse of the crystal structure that gradually progresses in the positive electrode active material, and the life is 200 cycles or more. It has been very difficult to manufacture a secondary battery having long-term reliability.
【０００４】このような問題を回避するために、負極に
各種の有機化合物を焼成した炭素質物にリチウム又はリ
チウムを主体とするアルカリ金属を担持させて構成する
二次電池の開発が試みられている。このような負極を用
いることにより、リチウムデンドライトの析出が防止さ
れサイクル特性が向上し、かつ金属リチウムを使用して
いないため安全性についても向上されてきている。In order to avoid such a problem, attempts have been made to develop a secondary battery in which a carbonaceous material obtained by firing various organic compounds on the negative electrode is loaded with lithium or an alkali metal mainly containing lithium. .. By using such a negative electrode, precipitation of lithium dendrite is prevented, cycle characteristics are improved, and safety is also improved because metal lithium is not used.
【０００５】一方、正極には、上記したマンガン酸化物
と異なる反応形態である層状化合物のインターカレーシ
ョン又はドーピング現象を利用した電極活物質が注目を
集めている。これら電極活物質は、充放電反応時におい
て複雑な化学反応を起こさないことから、極めて優れた
充放電サイクル特性を有することが期待される。中でも
炭素質材料を負極担持体とし、正極活物質として３．５
Ｖ程度の平均作動動作を示すＬｉＣｏＯ2 ，ＬｉＮｉＯ
2 ，ＬｉＣｏx Ｎｉ1-x Ｏ2 等が検討されてきている。On the other hand, for the positive electrode, an electrode active material utilizing the intercalation or doping phenomenon of a layered compound, which is a reaction form different from the above-mentioned manganese oxide, has been attracting attention. Since these electrode active materials do not cause complicated chemical reactions during charge / discharge reactions, they are expected to have extremely excellent charge / discharge cycle characteristics. Among them, the carbonaceous material is used as the negative electrode carrier and the positive electrode active material is 3.5.
LiCoO 2 , LiNiO showing an average operation of about V
2, LiCo x Ni 1-x O 2 and the like have been studied.
【０００６】[0006]
【発明が解決しようとする課題】しかし、炭素質材料を
負極担持体として使用した電池は、充放電サイクル寿命
が短く、それゆえ、十分な容量と充放電サイクル数を確
保することができなかった。すなわち、結着剤としてポ
リテトラフルオロエチレンを用いた場合、充放電サイク
ルの進行とともにリチウムと結着剤であるポリテトラフ
ルオロエチレンとが反応・分解し、負極体の結着能力を
大幅に低下させ、結着能力の低下による負極担持体の脱
落及び内部短絡などの問題があった。However, a battery using a carbonaceous material as a negative electrode carrier has a short charge / discharge cycle life, and therefore cannot secure a sufficient capacity and a sufficient number of charge / discharge cycles. .. That is, when polytetrafluoroethylene is used as the binder, lithium and the polytetrafluoroethylene that is the binder react and decompose with the progress of the charge / discharge cycle, and the binding ability of the negative electrode body is significantly reduced. However, there is a problem that the negative electrode carrier is detached due to a decrease in binding ability and an internal short circuit occurs.
【０００７】また、結着剤としてエチレン−プロピレン
−環状ジエンの三元共重合体を用いたものが提案されて
いるが、かかる結着剤は負極担持体を覆うような結着形
態をとるため電池内部抵抗が大幅に増大し、大電流放電
等においては充分な特性を得ることができないという問
題があった。[0007] Further, it has been proposed to use a terpolymer of ethylene-propylene-cyclic diene as a binder, but since such a binder has a binder form covering the negative electrode carrier. There is a problem that the internal resistance of the battery is significantly increased, and sufficient characteristics cannot be obtained in high current discharge or the like.
【０００８】本発明は、上記問題を解決するためになさ
れたもので、充放電サイクル寿命に優れ、かつ高い容量
維持率をもつ非水溶媒二次電池を提供することを目的と
するものである。The present invention has been made to solve the above problems, and an object of the present invention is to provide a non-aqueous solvent secondary battery having an excellent charge / discharge cycle life and a high capacity retention rate. ..
【０００９】[0009]
【課題を解決するための手段】上記問題を達成するため
に、本発明の非水溶媒二次電池は、リチウムまたはリチ
ウムを主体とするアルカリ金属を担持した炭素質物から
なる負極体と、セパレータと、リチウム含有複合酸化物
を正極活物質とする正極体をこの順序で一体的に積層し
て成る発電要素を具備する非水溶媒二次電池において、
前記負極体の結着剤としてポリアクリル酸（ＰＡＡ）と
スチレン・ブタジエンゴム（ＳＢＲ）を用いることを特
徴とするものである。In order to achieve the above-mentioned problems, a non-aqueous solvent secondary battery of the present invention comprises a negative electrode body composed of a carbonaceous material carrying lithium or an alkali metal mainly containing lithium, and a separator. A non-aqueous solvent secondary battery comprising a power generating element formed by integrally laminating a positive electrode body having a lithium-containing composite oxide as a positive electrode active material in this order,
Polyacrylic acid (PAA) and styrene-butadiene rubber (SBR) are used as a binder for the negative electrode body.
【００１０】本発明で用いられるリチウム含有複合酸化
物は、一般的に次のような方法で合成される。すなわ
ち、リチウムと、Ｃｏ，Ｎｉ，ＦｅまたはＭｎから選ば
れる１種または２種以上の遷移金属の炭酸塩、硝酸塩、
硫酸塩、水酸化物などを出発原料として、これらを化学
量論比で混合し、焼成することによって得られる。な
お、出発原料として炭酸塩が好ましい。焼成温度は出発
原料により多少異なるが、通常は６００〜１，０００℃
の温度範囲、好ましくは６００〜８００℃の範囲であ
る。The lithium-containing composite oxide used in the present invention is generally synthesized by the following method. That is, lithium and one or more kinds of transition metal carbonates, nitrates selected from Co, Ni, Fe or Mn,
It is obtained by using sulfates, hydroxides and the like as starting materials, mixing them in a stoichiometric ratio and firing. Carbonate is preferable as a starting material. The firing temperature varies depending on the starting materials, but is usually 600 to 1,000 ° C.
Temperature range, preferably in the range of 600 to 800 ° C.
【００１１】負極担持体である炭素質材料は、電池特性
の向上のために、好ましくは有機化合物を焼成してなる
炭素質物を用いる。この炭素質物の原料となる有機化合
物としては、通常使用されているものであれば、特に限
定されるものではなく、フェノール樹脂、特にノボラッ
ク樹脂並びにポリアクリロニトリルなどを用いることが
できる。また、この炭素質物としては特願平１−２８３
０８６号に示すような有機化合物焼成体の特性を有する
ものが特に好ましい。As the carbonaceous material as the negative electrode support, a carbonaceous material obtained by firing an organic compound is preferably used in order to improve the battery characteristics. The organic compound that is a raw material for the carbonaceous material is not particularly limited as long as it is a commonly used one, and a phenol resin, particularly a novolac resin, polyacrylonitrile, or the like can be used. As this carbonaceous material, Japanese Patent Application No. 1-283
Those having the characteristics of an organic compound fired body as shown in No. 086 are particularly preferable.
【００１２】本発明で結着剤として用いるポリアクリル
酸は、特に限定はなく、市販品のものを用いることがで
きる。特に２５％水溶液で中和されているもの、その中
でもアンモニウム塩で中和されているものが特に好まし
い。The polyacrylic acid used as the binder in the present invention is not particularly limited, and commercially available products can be used. Particularly, those neutralized with a 25% aqueous solution, and among them, those neutralized with ammonium salt are particularly preferable.
【００１３】また、スチレン・ブタジエンゴムについて
も特に限定はなく一般品を用いることができるが、中で
も重合率６０〜９５％、結合スチレン２０〜５０％で、
変性のスチレン・ブタジエンゴムラテックスを用いるこ
とが好ましい。The styrene-butadiene rubber is not particularly limited, and general products can be used. Among them, the polymerization rate is 60 to 95% and the bound styrene is 20 to 50%.
It is preferable to use a modified styrene-butadiene rubber latex.
【００１４】なお、負極体における負極担持体量は全体
の９０重量％以上であり、結着剤量は０．５〜５．０重
量％である。そのうちポリアクリル酸は０．５〜３．０
重量％、好ましくは１．０〜１．５重量％であり、スチ
レン・ブタジエンゴムは１．０〜５．０重量％、好まし
くは２．０〜３．０重量％である。結着剤量が５．０重
量％を越えると、負極の内部抵抗が増加し、電池の重負
荷放電の能力を大幅に低下させるので好ましくない。ま
た、ポリアクリル酸が３．０重量％越えると、増粘効果
が大きくなり、後述するスラリー化が困難なため好まし
くなく、スチレン・ブタジエンゴムが５．０重量％を越
えると、結着効果が大きくなり電池の内部抵抗を増加さ
せる原因となるため好ましくない。The amount of the negative electrode carrier in the negative electrode body is 90% by weight or more, and the amount of the binder is 0.5 to 5.0% by weight. Polyacrylic acid is 0.5-3.0
% By weight, preferably 1.0 to 1.5% by weight, and styrene-butadiene rubber is 1.0 to 5.0% by weight, preferably 2.0 to 3.0% by weight. If the amount of the binder exceeds 5.0% by weight, the internal resistance of the negative electrode increases, and the heavy load discharge capacity of the battery is significantly reduced, which is not preferable. Further, when the polyacrylic acid exceeds 3.0% by weight, the thickening effect becomes large and it becomes difficult to form a slurry as described later, which is not preferable, and when the styrene-butadiene rubber exceeds 5.0% by weight, the binding effect becomes large. It is not preferable because it becomes large and increases the internal resistance of the battery.
【００１５】本発明において、非水溶媒二次電池に用い
られる非水電解液の電解質としては、ＬｉＰＦ6 ，Ｌｉ
ＣｌＯ4 ，ＬｉＢＦ4，ＬｉＣＦ3 ＳＯ3 等のリチウム
塩などが挙げられる。このような電解液の溶媒として
は、プロピレンカーボネート（ＰＣ）、エチレンカーボ
ネート（ＥＣ）、テトラヒドロフラン、２−メチルテト
ラヒドロフラン、γ−ブチロラクトン、１，２ジメトキ
シエタン（ＤＭＥ）が挙げられる。これらの溶媒は、１
種または２種以上の混合物で用いることができ、特に充
放電サイクル寿命を長くする観点から、プロピレンカー
ボネート（ＰＣ）と１，２ジメトキシエタン（ＤＭＥ）
との混合溶媒、エチレンカーボネート（ＥＣ）と２−メ
チルテトラヒドロフランとの混合溶媒、エチレンカーボ
ネート（ＥＣ）と１，２ジメトキシエタンとの混合溶
媒、プロピレンカーボネート（ＰＣ）とエチレンカーボ
ネート（ＥＣ）との混合溶媒が好ましい。In the present invention, the electrolyte of the non-aqueous electrolyte used in the non-aqueous solvent secondary battery is LiPF 6 , Li.
Examples thereof include lithium salts such as ClO 4 , LiBF 4 , and LiCF 3 SO 3 . Examples of the solvent for such an electrolytic solution include propylene carbonate (PC), ethylene carbonate (EC), tetrahydrofuran, 2-methyltetrahydrofuran, γ-butyrolactone, and 1,2-dimethoxyethane (DME). These solvents are 1
Can be used as a mixture of two or more kinds, and in particular from the viewpoint of prolonging the charge / discharge cycle life, propylene carbonate (PC) and 1,2 dimethoxyethane (DME).
A mixed solvent of ethylene carbonate (EC) and 2-methyltetrahydrofuran, a mixed solvent of ethylene carbonate (EC) and 1,2-dimethoxyethane, a mixed solvent of propylene carbonate (PC) and ethylene carbonate (EC) Solvents are preferred.
【００１６】[0016]
【作用】本発明の２次電池においては、リチウムまたは
リチウムを主体とするアルカリ金属を担持した炭素質物
からなる負極体と、セパレータと、リチウム含有複合酸
化物を正極活物質とする正極体をこの順序で一体的に積
層して成る発電要素を具備する非水溶媒二次電池におい
て、前記負極体の結着剤としてポリアクリル酸とスチレ
ン・ブタジエンゴムを用いることによりリチウムと結着
剤との反応はなくなり、その結果、充放電サイクルを繰
り返しても集電体と負極担持体との導電性を損なうこと
により生ずる電池内部抵抗の増加、また結着能力の低下
による負極担持体の脱落、及び内部短絡はなくなる。し
たがって、充放電サイクル寿命が向上し、しかも電池性
能が安定した非水溶媒二次電池を得ることができる。In the secondary battery of the present invention, a negative electrode body made of a carbonaceous material carrying lithium or an alkali metal mainly containing lithium, a separator, and a positive electrode body having a lithium-containing composite oxide as a positive electrode active material are used. In a non-aqueous solvent secondary battery including a power generation element that is integrally laminated in order, reaction between lithium and a binder is achieved by using polyacrylic acid and styrene-butadiene rubber as a binder for the negative electrode body. As a result, the internal resistance of the battery increases due to the loss of conductivity between the current collector and the negative electrode carrier even when the charge / discharge cycle is repeated, and the negative electrode carrier drops off due to a decrease in binding ability, and The short circuit disappears. Therefore, it is possible to obtain a non-aqueous solvent secondary battery with improved charge / discharge cycle life and stable battery performance.
【００１７】[0017]
【実施例】以下、本発明の実施例を比較例と比較して詳
細に説明する。 （実施例）市販の炭酸リチウム及び炭酸コバルトを、Ｌ
ｉとＣｏのモル比でＬｉ／Ｃｏ＝１．１になるように評
量し、乳鉢において充分混合する。この混合物をアルミ
ナ製の坩堝にいれ、電気炉において８００℃で６時間加
熱処理する。得られた焼成物は、冷却後再度粉砕し、前
と同様に８００℃で６時間加熱処理を行い、その後、蒸
留水で充分に洗浄し、未反応のアルカリ分を洗い流す。
この生成物は粉末Ｘ線法でＬｉＣｏＯ2 と確認された。
この生成物９０重量％、導電材としてアセチレンブラッ
ク７重量％及び結着剤としてエチレン−プロピレン−環
状ジエンの三元共重合体３重合％をヘキサン中で混練し
てスラリー状の正極合剤を調整し、この正極合剤を厚さ
１０μｍの基板上に塗布、風乾した後、加圧成形して一
定厚にし、つづいて、０．２６ｍｍ厚の正極合剤層を有
する板状の正極を製造した。EXAMPLES Hereinafter, examples of the present invention will be described in detail in comparison with comparative examples. (Example) Commercially available lithium carbonate and cobalt carbonate were mixed with L
Weigh so that the molar ratio of i and Co is Li / Co = 1.1, and mix well in a mortar. This mixture is put into an alumina crucible and heat-treated at 800 ° C. for 6 hours in an electric furnace. The obtained calcined product is cooled and then pulverized again, followed by heat treatment at 800 ° C. for 6 hours as before, followed by thorough washing with distilled water to wash away unreacted alkali components.
This product was confirmed to be LiCoO 2 by a powder X-ray method.
90% by weight of this product, 7% by weight of acetylene black as a conductive material, and 3% by weight of a terpolymer of ethylene-propylene-cyclic diene terpolymer as a binder were kneaded in hexane to prepare a positive electrode mixture slurry. Then, this positive electrode mixture was applied onto a substrate having a thickness of 10 μm, air-dried, and then pressure-molded to a constant thickness, and subsequently, a plate-shaped positive electrode having a positive electrode mixture layer of 0.26 mm thickness was manufactured. .
【００１８】一方、負極担持体である炭素質材料はノボ
ラック樹脂を窒素雰囲気化で９５０℃で焼成した後、さ
らに、２，０００℃に加熱して炭素化することによって
製造し、粉砕して平均径１０μｍの粉末とする。結着剤
に用いるポリアクリル酸（ＰＡＡ）は予め蒸留水で溶解
させる。スチレン・ブタジエンゴム（ＳＢＲ）は予め蒸
留水に分散させ、上記炭素質材料と結着剤の割合が重量
比で９６：４（またＰＡＡとＳＢＲの割合が重量比で
１：２）となるように分散させスラリー状の負極合剤を
製造した。この負極合剤を厚さ１０μｍのステンレス基
板上に塗布・乾燥して厚さ０．２ｍｍの負極合剤層を有
する板状の負極を製造した。On the other hand, the carbonaceous material as the negative electrode carrier is manufactured by firing the novolak resin at 950 ° C. in a nitrogen atmosphere, and then heating it to 2,000 ° C. to carbonize it, and crushing it to give an average. The powder has a diameter of 10 μm. Polyacrylic acid (PAA) used as a binder is previously dissolved with distilled water. Styrene-butadiene rubber (SBR) is previously dispersed in distilled water so that the weight ratio of the carbonaceous material to the binder is 96: 4 (and the weight ratio of PAA and SBR is 1: 2). To prepare a slurry-like negative electrode mixture. This negative electrode mixture was applied onto a stainless steel substrate having a thickness of 10 μm and dried to produce a plate-shaped negative electrode having a negative electrode mixture layer having a thickness of 0.2 mm.
【００１９】このようにして得られた正・負極を用い
て、図１に示すような単三（ＡＡ）サイズの非水溶媒二
次電池を組み立てた。すなわち、同図に示すように、非
水溶媒二次電池１は、底部に絶縁体２が配置され、負極
端子を兼ねる有底円筒状のステンレス容器３を有する。
この容器３には電極群４が収納されている。この電極群
４は負極５、セパレータ６及び正極７をこの順序で積層
した帯状物を、負極５が外側に位置するように渦巻き状
に巻回した構造になっている。セパレータ６は、電解液
を含浸したポリプロピレン性多孔質フィルムから形成さ
れている。各電解液は、プロピレンカーボネートと１，
２−ジメトキシエタンとの混合溶媒（体積比率５０：５
０）に、電解質として六弗化リン酸リチウム（ＬｉＰＦ
6 ）を０．５モル濃度含有する。容器３内で電極群４の
上方には、中心を開口した絶縁板８が配置されており、
また、この容器３の上部開口部には、絶縁封口体９が容
器３に気密にかしめ固定されている。この絶縁板８の中
央開口部には、正極端子１０が嵌合されている。この正
極端子１０は正極７に正極リード１１を介して接続され
ている。なお、負極５は、図示しない負極リードを介し
て負極端子である容器３に接続されている。Using the positive and negative electrodes thus obtained, a non-aqueous solvent secondary battery of size AA (AA) as shown in FIG. 1 was assembled. That is, as shown in the figure, the non-aqueous solvent secondary battery 1 has a bottomed cylindrical stainless steel container 3 which also has an insulator 2 arranged at the bottom and also serves as a negative electrode terminal.
An electrode group 4 is housed in this container 3. The electrode group 4 has a structure in which a band-shaped material in which a negative electrode 5, a separator 6 and a positive electrode 7 are laminated in this order is spirally wound so that the negative electrode 5 is located outside. The separator 6 is formed of a polypropylene porous film impregnated with an electrolytic solution. Each electrolyte is propylene carbonate and 1,
Mixed solvent with 2-dimethoxyethane (volume ratio 50: 5
0), lithium hexafluorophosphate (LiPF 6) as an electrolyte
6 ) is contained at a 0.5 molar concentration. An insulating plate 8 having an opening in the center is arranged above the electrode group 4 in the container 3,
An insulating sealing body 9 is airtightly caulked and fixed to the container 3 at the upper opening of the container 3. The positive electrode terminal 10 is fitted in the central opening of the insulating plate 8. The positive electrode terminal 10 is connected to the positive electrode 7 via a positive electrode lead 11. The negative electrode 5 is connected to the container 3, which is a negative electrode terminal, via a negative electrode lead (not shown).
【００２０】（比較例１）負極の結着剤にポリテトラフ
ルオロエチレンを用いた以外は実施例と同様の非水溶媒
二次電池を組み立てた。 （比較例２）負極の結着剤にエチレン−プロピレン−環
状ジエンの三元共重合体を用いた以外は実施例と同様の
非水溶媒二次電池を組み立てた。このようにして組立て
た実施例、比較例１、２の３種類の非水溶媒二次電池に
ついて、２０℃の一定温度、１００ｍＡの一定電流で
４．３Ｖから３．０Ｖまでの電圧範囲の充放電評価を行
った。その結果を図２に示す。図中、Ａは本実施例の電
池、Ｂは比較例の電池、Ｃは比較例の電池の放電容量維
持率曲線である。Comparative Example 1 A non-aqueous solvent secondary battery was assembled in the same manner as in Example except that polytetrafluoroethylene was used as the binder for the negative electrode. (Comparative Example 2) A non-aqueous solvent secondary battery similar to that of the example was assembled except that an ethylene-propylene-cyclic diene terpolymer was used as the binder of the negative electrode. The three types of non-aqueous solvent secondary batteries of Example and Comparative Examples 1 and 2 assembled in this way were charged at a constant temperature of 20 ° C. and a constant current of 100 mA in a voltage range of 4.3 V to 3.0 V. The discharge was evaluated. The result is shown in FIG. In the figure, A is the battery of this example, B is the battery of the comparative example, and C is the discharge capacity retention rate curve of the battery of the comparative example.
【００２１】図２から明らかなように、本実施例の非水
溶媒二次電池は、比較例の電池に比べ、充放電サイクル
を繰り返し行っても高い容量維持率を示し、優れた性能
を有することが分かる。一方、評価を終了した電池を分
解し、負極電極の表面状態を観察すると、比較例１の電
池の電極は炭素材が基板より脱落し易い状態になってお
り、これはリチウムと結着剤が反応・分解したためによ
るものと考えられる。また、比較例２の電池は電極表面
にかなりのリチウムが析出していた。As is clear from FIG. 2, the non-aqueous solvent secondary battery of this example has a higher capacity retention rate even after repeated charge and discharge cycles and has excellent performance, as compared with the battery of the comparative example. I understand. On the other hand, when the battery after the evaluation was disassembled and the surface condition of the negative electrode was observed, the electrode of the battery of Comparative Example 1 was in a state where the carbonaceous material was easily detached from the substrate. It is thought to be due to reaction and decomposition. Further, in the battery of Comparative Example 2, considerable lithium was deposited on the electrode surface.
【００２２】[0022]
【発明の効果】以上説明したように、本発明の非水溶媒
二次電池は、負極担持体に炭素質物を、正極活物質とし
てリチウム含有複合酸化物を用い、かつ負極体の結着剤
としてポリアクリル酸とスチレン・ブタジエンゴムを用
いることによって充放電サイクルの進行に伴なうリチウ
ムと結着剤との反応・分解等をなくすことができる。そ
の結果、充放電サイクルを繰り返しても集電体と負極担
持体との導電性を損なうことによる電池内部抵抗の増
加、また結着能力の低下による負極担持体の脱落及び内
部短絡をも改善することができるので、容量維持率を向
上し、かつ長寿命を有する優れた非水溶媒二次電池を得
ることができる。As described above, in the non-aqueous solvent secondary battery of the present invention, the carbonaceous material is used as the negative electrode carrier, the lithium-containing composite oxide is used as the positive electrode active material, and the binder is used as the negative electrode body. By using polyacrylic acid and styrene / butadiene rubber, it is possible to eliminate the reaction / decomposition of lithium and the binder with the progress of charge / discharge cycles. As a result, even if the charge / discharge cycle is repeated, the internal resistance of the battery is increased by impairing the conductivity between the current collector and the negative electrode carrier, and the dropping of the negative electrode carrier and the internal short circuit due to the decrease in the binding ability are also improved. Therefore, it is possible to obtain an excellent non-aqueous solvent secondary battery having an improved capacity retention rate and a long life.
【図１】本発明の一実施例である非水溶媒二次電池の一
部断面図。FIG. 1 is a partial cross-sectional view of a non-aqueous solvent secondary battery that is an embodiment of the present invention.
【図２】本発明の実施例と比較例との充放電サイクル数
に対する放電容量維持率の変化を示す特性図。FIG. 2 is a characteristic diagram showing a change in discharge capacity retention rate with respect to the number of charge / discharge cycles of an example of the present invention and a comparative example.
１…非水溶媒二次電池、２…絶縁体、３…ステンレス容
器、４…電極群、５…負極、６…セパレータ、７…正
極、８…絶縁板、９…絶縁封口板、１０…正極端子、１
１…正極リード。1 ... Non-aqueous solvent secondary battery, 2 ... Insulator, 3 ... Stainless steel container, 4 ... Electrode group, 5 ... Negative electrode, 6 ... Separator, 7 ... Positive electrode, 8 ... Insulating plate, 9 ... Insulating sealing plate, 10 ... Positive electrode Terminal, 1
1 ... Positive electrode lead.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 阿左美 義明 東京都品川区南品川三丁目４番10号 東芝 電池株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Asami, 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Battery Co., Ltd.
Claims (1)
ルカリ金属を担持した炭素質物からなる負極体と、セパ
レータと、リチウム含有複合酸化物を正極活物質とする
正極体をこの順序で一体的に積層して成る発電要素を具
備する非水溶媒二次電池において、前記負極体の結着剤
としてポリアクリル酸とスチレン・ブタジエンゴムを用
いることを特徴とする非水溶媒二次電池。Claims: 1. A negative electrode body comprising a carbonaceous material supporting lithium or an alkali metal mainly containing lithium, a separator, and a positive electrode body using a lithium-containing composite oxide as a positive electrode active material in this order. In a non-aqueous solvent secondary battery comprising a power generation element integrally laminated with a non-aqueous solvent secondary battery, polyacrylic acid and styrene-butadiene rubber are used as a binder for the negative electrode body. ..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175283A JP3062304B2 (en) | 1991-07-16 | 1991-07-16 | Non-aqueous solvent secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175283A JP3062304B2 (en) | 1991-07-16 | 1991-07-16 | Non-aqueous solvent secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0521068A true JPH0521068A (en) | 1993-01-29 |
| JP3062304B2 JP3062304B2 (en) | 2000-07-10 |
Family
ID=15993420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3175283A Expired - Fee Related JP3062304B2 (en) | 1991-07-16 | 1991-07-16 | Non-aqueous solvent secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3062304B2 (en) |
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-
1991
- 1991-07-16 JP JP3175283A patent/JP3062304B2/en not_active Expired - Fee Related
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