JP2011192581A - 電気化学素子用非水電解液および電気化学素子 - Google Patents
電気化学素子用非水電解液および電気化学素子 Download PDFInfo
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- JP2011192581A JP2011192581A JP2010059136A JP2010059136A JP2011192581A JP 2011192581 A JP2011192581 A JP 2011192581A JP 2010059136 A JP2010059136 A JP 2010059136A JP 2010059136 A JP2010059136 A JP 2010059136A JP 2011192581 A JP2011192581 A JP 2011192581A
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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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Abstract
Description
<正極の作製>
Li1.02Ni0.6Mn0.20Co0.20O2で表される正極活物質100質量部と、結着剤であるPVDFを10質量%の濃度で含むNMP溶液20質量部と、導電助剤である人造黒鉛1質量部およびケッチェンブラック1質量部とを、プラネタリーミキサーを用いて混練し、更にNMPを加えて粘度を調節して、正極合剤含有組成物を調製した。
負極活物質である数平均粒子径が10μmの天然黒鉛97.5質量部と、結着剤であるスチレンブタジエンゴム1.5質量部と、増粘剤であるカルボキシメチルセルロース1質量部とに、水を加えて混合し、負極合剤含有ペーストを調製した。この負極合剤含有ペーストを厚みが8μmの銅箔の両面に塗布した後、120℃で12時間の真空乾燥を行って、銅箔の両面に負極合剤層を形成した。その後、プレス処理を行って、負極合剤層の厚みおよび密度を調節し、銅箔の露出部にニッケル製のリード体を溶接して、長さ380mm、幅44mmの帯状の負極を作製した。なお、得られた負極における負極合剤層は、片面あたりの厚みが65μmであった。
エチレンカーボネートとメチルエチルカーボネートとジエチルカーボネートとの容積比2:3:1の混合溶媒に、LiPF6を1mol/Lの濃度で溶解させ、更に、下記式(3)で表される化合物0.5質量%と、ビニレンカーボネート2.5質量%とを添加して、電解液を調製した。
前記帯状の正極を、厚みが16μmの微孔性ポリエチレンセパレータ(空孔率:41%)を介して前記帯状の負極に重ね、渦巻状に巻回した後、扁平状になるように加圧して扁平状の巻回電極体とし、この巻回電極体をポリプロピレン製の絶縁テープで固定した。次に、外寸が厚さ4.0mm、幅34mm、高さ50mmのアルミニウム合金製の角形の電池ケースに前記巻回電極体を挿入し、リード体の溶接を行うとともに、アルミニウム合金製の蓋板を電池ケースの開口端部に溶接した。その後、蓋板に設けた注入口から前記電解液を注入し、1時間静置した後注入口を封止して、図1に示す構造で、図2に示す外観の非水二次電池を得た。なお、前記非水二次電池の設計電気容量は、800mAhとした。
正極活物質をLi1.02Ni0.82Co0.15Al0.03O2に変更した以外は実施例1と同様にして正極を作製した。
前記式(3)で表される化合物に代えて、下記式(5)で表される化合物1.3質量%を添加した以外は、実施例1と同様にして電解液を調製し、この電解液を用いた以外は、実施例1と同様にして非水二次電池を作製した。
前記式(3)で表される化合物に代えて、下記式(6)で表される化合物1.0質量%を添加した以外は、実施例1と同様にして電解液を調製し、この電解液を用いた以外は、実施例1と同様にして非水二次電池を作製した。
前記式(3)で表される化合物を添加しなかった以外は実施例1と同様にして電解液を調製し、この電解液を用いた以外は、実施例1と同様にして非水二次電池を作製した。
前記式(3)で表される化合物を添加しなかった以外は実施例1と同様にして電解液を調製し、この電解液を用いた以外は、実施例2と同様にして非水二次電池を作製した。
実施例1〜4および比較例1〜2の各電池を、60℃で7時間保存した後、20℃で、200mAの電流値で5時間充電し、200mAの電流値で電池電圧が3Vに低下するまで放電する充放電サイクルを、放電容量が一定になるまで繰り返した。次いで、定電流−定電圧充電(定電流:500mA、定電圧:4.2V、総充電時間:3時間)を行い、1時間休止後に200mAの電流値で電池電圧が3Vとなるまで放電して標準容量を求めた。なお、標準容量は各電池とも100個の電池について測定し、その平均値を各実施例、比較例の標準容量とした。
実施例1〜4および比較例1〜2の各電池について、定電流−定電圧充電(定電流:0.4C、定電圧:4.25V、総充電時間:3時間)を行った後、恒温槽に入れて80℃で5日間放置し、その後の電池の厚みを測定した。このようにして得られた各電池の貯蔵後の厚みと、貯蔵前の厚み(4.0mm)との差から求められる貯蔵時の電池の膨れにより、貯蔵特性を評価した。
2 負極
3 セパレータ
Claims (4)
- ビニレンカーボネートを更に含有する請求項1に記載の電気化学素子用非水電解液。
- 正極、負極、セパレータおよび非水電解液を有する電気化学素子であって、
前記非水電解液に、請求項1または2に記載の電気化学素子用非水電解液を用いたことを特徴とする電気化学素子。 - 負極は、集電体の片面または両面に、炭素材料を含有する負極合剤層を有するものである請求項3に記載の電気化学素子。
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JP2014022191A (ja) * | 2012-07-18 | 2014-02-03 | Mitsubishi Chemicals Corp | 非水系電解液及びそれを用いた非水系電解液電池 |
JP2014049293A (ja) * | 2012-08-31 | 2014-03-17 | Tdk Corp | リチウムイオン二次電池用非水電解液及びリチウムイオン二次電池 |
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JP2000294272A (ja) * | 1999-04-02 | 2000-10-20 | Mitsui Chemicals Inc | 非水電解液およびそれを用いた二次電池 |
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JPH11219723A (ja) * | 1998-01-30 | 1999-08-10 | Sanyo Electric Co Ltd | 非水系電解液電池 |
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JP2014022191A (ja) * | 2012-07-18 | 2014-02-03 | Mitsubishi Chemicals Corp | 非水系電解液及びそれを用いた非水系電解液電池 |
JP2014049293A (ja) * | 2012-08-31 | 2014-03-17 | Tdk Corp | リチウムイオン二次電池用非水電解液及びリチウムイオン二次電池 |
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