ELECTRODE GROUP AND NONAQUEOUS ELECTROLYTE BATTERY

• Main Authors: YAMAGISHI GENKI, SHIKODA MASAKI, YAMAMOTO MASARU, SARUWATARI HIDESATO, KANO TETSUO, WATANABE YUKI
• Format: Patent
• Language: English; Japanese
• Published: 21.04.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide an electrode group which enables the materialization of a nonaqueous electrolyte battery superior in rate characteristic and cycle characteristic.SOLUTION: An electrode group 1 according to an embodiment comprises: a negative electrode 4; a positive electrode 3; and a separator 5. The negative electrode 4 includes: a negative electrode current collector 4a; and a negative electrode layer 4b. The negative electrode layer 4b includes a lithium titanium oxide. The positive electrode 3 includes: a positive electrode current collector 3a; and a positive electrode layer 3b. The separator 5 is disposed between the negative electrode layer 4b and the positive electrode layer 3b. The separator 5 includes at least one material having a high heat resistance. The separator 5 has a thickness of 3-9 μm. The negative electrode current collector 4a includes: a negative electrode coating part 4c with a negative electrode layer 4b supported on its surface; and a negative electrode uncoated part 4d which does not support the negative electrode layer 4b on the surface. The ratio of the area of the negative electrode uncoated part 4d to the area of the negative electrode coating part 4c is 0.05-0.07.SELECTED DRAWING: Figure 1 【課題】レート特性とサイクル特性とに優れた非水電解質電池を実現することができる電極群を提供すること【解決手段】１つの実施形態に係る電極群1は、負極4と、正極3と、セパレータ5とを具備する。負極4は負極集電体4aと負極層4bとを含む。負極層4bはリチウムチタン酸化物を含む。正極3は正極集電体3aと正極層3bとを含む。セパレータ5は、負極層4bと正極層3bとの間に配置されている。セパレータ5は、高い耐熱性を持つ１種以上の材料を含む。セパレータ5は厚さが3μm〜9μmである。負極集電体4aは、表面に負極層4bを担持している負極塗工部4cと、表面に負極層4bを担持していない負極未塗工部4dとを含む。負極未塗工部4dの面積の負極塗工部4cの面積に対する割合は0.05〜0.07である。【選択図】 図１