JP2011138623A - 非水系二次電池 - Google Patents
非水系二次電池 Download PDFInfo
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- JP2011138623A JP2011138623A JP2009295907A JP2009295907A JP2011138623A JP 2011138623 A JP2011138623 A JP 2011138623A JP 2009295907 A JP2009295907 A JP 2009295907A JP 2009295907 A JP2009295907 A JP 2009295907A JP 2011138623 A JP2011138623 A JP 2011138623A
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- Prior art keywords
- positive electrode
- coupling agent
- mass
- active material
- electrode active
- Prior art date
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- 125000002560 nitrile group Chemical group 0.000 claims abstract description 51
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- 239000000203 mixture Substances 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 3
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- 125000004966 cyanoalkyl group Chemical group 0.000 claims description 2
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- 125000000725 trifluoropropyl group Chemical group [H]C([H])(*)C([H])([H])C(F)(F)F 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
Abstract
Description
NC−R−CN (II)
(ただし、Rは炭素原子数2〜8のアルキル鎖を示す。)
[正極の作製]
各種正極活物質を95質量%、導電剤としての無定形炭素HS−100(商品名)2.5質量%、ポリフッ化ビニリデン(PVdF)2.5質量%の割合で混合して正極合剤とし、これに正極合剤質量の50質量%のN−メチルピロリドン(NMP)を加えてスラリー状にした。得られたスラリーに各種カップリング剤を所定量添加し、十分に撹拌した後、ドクターブレード法により厚さ12μmのアルミ箔の両面に塗布(塗布量400g/m2)した。その後、加熱乾燥(70〜140℃)及び加圧成型して充填密度3.70g/cc(LiMn2O4、LiMn1/3Ni1/3Co1/3O2については3.12g/cc))となるようにし、所定の大きさに切り出して正極板を得た。
人造黒鉛(d=0.335nm)97質量%、増粘剤としてのカルボキシメチルセルロース(CMC)2質量%、結着材としてのスチレンブタジエンゴム(SBR)1質量%の割合で混合し、これに水を加えてスラリー状にして厚さ8μmの銅箔の両面に塗布(塗布量210g/m2)した。その後、これを乾燥させて圧縮ローラーを用いて圧縮し、所定の大きさに切り出して負極極板を作製した。
所定の寸法にスリットした正極板と負極板に集電タブを溶接し、厚さ16μmのポリエチレン微多孔膜のセパレータを挟んで捲回し、巻回電極体を作製した。得られた巻回電極体をカップ成型したラミネート外装体内に収納し、注液口を除いて熱シールすることにより注液前電池を作製した。
非水電解質としては、EC/PC/EMC/ピバリン酸メチルをそれぞれ体積%で25/5/10/60となるように混合した非水溶媒を用い、これに電解質塩としてのLiPF6濃度が1Mとなるように溶解したものを用いた。この非水電解質を19mlを注液口より注入した後に真空含浸処理を行い、その後注液口を熱シールして充放電を行い、設計容量3600mAh(1It=3600mA)の非水系二次電池を完成させた。
上述のようにして作製された各実施例及び比較例の電池のそれぞれに対し、以下の測定方法に従って、初期容量、低温充電特性、サイクル特性比容量、作動電圧、高温充電保存特性を求めた。
各実施例及び比較例の電池のそれぞれに対し、23℃の恒温槽中で、0.5It=1800mAの定電流で電池電圧が4.2Vに達するまで充電し、さらに電池電圧が4.2Vに達した後は、4.2Vの定電圧で電流値が(1/50)It=180mAになるまで充電した。このときの充電容量を常温充電容量として求めた。その後、0.5It=1800mAの定電流で電池電圧が2.75Vになるまで放電した。このときの放電容量を初期容量として求めた。
上述のようにして初期容量を測定した各実施例及び比較例の電池のそれぞれに対し、−5℃の恒温槽中で、1It=3600mAの定電流で電池電圧が4.2Vに達するまで充電し、さらに電池電圧が4.2Vに達した後は、4.2Vの定電圧で電流値が(1/50)It=180mAになるまで充電した。このときの充電容量を低温充電容量として求めた。そして、以下の計算式によって低温充電特性(%)を求めた。
低温充電特性(%)=(低温充電容量/常温充電容量)×100
各実施例及び比較例のそれぞれのの電池について、23℃の恒温槽中で、1It=3600mAの定電流で電池電圧が4.2Vに達するまで充電し、さらに電池電圧が4.2Vに達した後は、4.2Vの定電圧で電流値が(1/50)It=180mAになるまで充電した。その後、1It=3600mAの定電流で電池電圧が2.75Vになるまで放電した。このときの放電容量を1サイクル時の放電容量として求めた。同様の充放電を800回繰り返し、800回目の放電容量を800サイクル時の放電容量として求め、以下の計算式に基いてサイクル特性(%)を求めた。
サイクル特性(%)=(800サイクル時の放電容量/1サイクル時の放電容量)×100
作動電圧の測定は、上記1サイクル時の放電容量の測定時の平均電圧として求めた。
高温充電保存特性は以下のようにして測定した。各実施例及び比較例のそれぞれのの電池について、23℃の恒温槽中で、1It=3600mAの定電流で電池電圧が4.2Vに達するまで充電し、さらに電池電圧が4.2Vに達した後は、4.2Vの定電圧で電流値が(1/50)It=180mAになるまで充電した。その後、1It=3600mAの定電流で電池電圧が2.75Vになるまで放電した。このときの放電容量を高温保存前放電容量として求めた。次いで、各実施例及び比較例のそれぞれのの電池について、23℃の恒温槽中で、1It=3600mAの定電流で電池電圧が4.2Vに達するまで充電し、さらに電池電圧が4.2Vに達した後は、4.2Vの定電圧で電流値が(1/50)It=180mAになるまで充電した。この満充電となった電池を80℃の恒温槽中に10日間放置した。
容量効率(%)=(高温保存後放電容量/高温保存前放電容量)×100
実施例1〜18、比較例1〜10の非水系二次電池としては、正極活物質として平均粒径が13.1μmであり、比表面積が0.25m2/gのLiCoO2を用いた。
実施例19〜36、比較例11〜12の非水系二次電池としては、正極活物質として平均粒径が13.1μmであり、比表面積が0.25m2/gのLiCoO2を用い、さらに非水電解質中に添加するニトリル基含有化合物としてはアジポニトリルを1.0質量%となるように添加したものを用いた。
実施例37〜50及び比較例13〜31のの非水系二次電池としては、非水電解質中に添加するニトリル基含有化合物としてはアジポニトリルを用い、正極合剤層中に添加するカップリング剤としてはアルミニウムビスエチルアセトアセテートモノアセチルアセトネートを用いた。
Claims (4)
- リチウム複合酸化物を正極活物質とする正極合剤層が形成された正極極板と、負極極板と、セパレータと、非水電解質とを備える非水系二次電池において、
前記非水電解質中にニトリル基含有化合物を前記非水電解質の総量に対して0.05質量%以上含有し、
前記正極活物質の平均粒径が4.5〜15.5μm、比表面積が0.13〜0.80m2/gであり、
前記正極合剤層がシランカップリング剤もしくは下記一般式(I)で表されるカップリング剤の少なくとも1種を前記正極活物質の質量に対して0.003質量%以上5質量%以下含有していることを特徴とする非水系二次電池。
- 前記ニトリル基含有化合物は、下記一般式(II)で表されるジニトリル化合物であることを特徴とする請求項1〜3のいずれかに記載の非水系二次電池。
NC−R−CN (II)
(ただし、Rは炭素原子数2〜8のアルキル鎖を示す。)
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JP2009295907A JP2011138623A (ja) | 2009-12-25 | 2009-12-25 | 非水系二次電池 |
US12/964,870 US8709665B2 (en) | 2009-12-25 | 2010-12-10 | Nonaqueous secondary battery with nitrile group-containing compound |
CN2010106040004A CN102110846A (zh) | 2009-12-25 | 2010-12-22 | 非水系二次电池 |
KR1020100134416A KR20110074704A (ko) | 2009-12-25 | 2010-12-24 | 비수계 이차 전지 |
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JP2017045673A (ja) * | 2015-08-28 | 2017-03-02 | 株式会社Gsユアサ | 非水電解質電池用正極及び非水電解質電池 |
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CN102299335A (zh) * | 2011-07-20 | 2011-12-28 | 彩虹集团公司 | 一种制备磷酸亚铁锂电池涂布工艺用添加剂 |
JPWO2013018692A1 (ja) * | 2011-07-29 | 2015-03-05 | 三洋電機株式会社 | 非水電解質二次電池用正極活物質、その製造方法、当該正極活物質を用いた非水電解質二次電池用正極、及び、当該正極を用いた非水電解質二次電池 |
CN112825373B (zh) * | 2019-11-20 | 2022-06-14 | 珠海冠宇电池股份有限公司 | 一种非水电解液及包括所述非水电解液的锂二次电池 |
CN112599761B (zh) * | 2020-12-11 | 2022-03-18 | 宁德新能源科技有限公司 | 电化学装置和电子装置 |
KR102539836B1 (ko) | 2021-04-16 | 2023-06-07 | 재단법인 나노기반소프트일렉트로닉스연구단 | 피부 부착형 유체 포집 패치 및 그의 제조방법 |
CN113517435A (zh) * | 2021-06-07 | 2021-10-19 | 江苏劲鹿新能源科技有限公司 | 一种低温锂电池配方及制片工艺 |
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