LITHIUM ION BATTERY

• Main Authors: MIMURA HIDEYUKI, AOKI MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 24.08.2017
• 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 a lithium ion battery improved in the worsening of charge and discharge cycle characteristics owing to the rise in temperature.SOLUTION: A lithium ion battery comprises: a negative electrode including a carbonaceous material capable of occluding and releasing lithium ions, a current collector, and a binding agent for binding the carbon material and the current collector; a positive electrode; and a nonaqueous electrolyte solution. The negative electrode includes, as the binding agent, carboxymethylcellulose and/or a salt thereof. The nonaqueous electrolyte solution includes fluorine-containing phosphoric ester expressed by the formula (1). (Rfto Rfindependently represent H, a straight-chain/branched alkyl group with C1-6 or a straight-chain/branched fluorine-containing alkyl group with C1-6; and at least one of Rfto Rfis a fluorine-containing alkyl group.)SELECTED DRAWING: None 【課題】温度上昇による充放電サイクル特性低下について改善されたリチウムイオン電池の提供。【解決手段】リチウムイオンを吸蔵・放出しうる炭素質材料、集電体及び炭素材料と集電体とを結着する結着剤を有する負極と、正極と、非水電解液とを備え、負極が結着剤としてカルボキシメチルセルロース及び/又はその塩を含有し、非水電解液が式（１）で表される含フッ素リン酸エステルを含むリチウムイオン電池。（Ｒｆ１〜Ｒｆ３は夫々独立にＨ、Ｃ１〜６の直鎖／分岐のアルキル基又はＣ１〜６の直鎖／分岐の含フッ素アルキル基；且つＲｆ１〜Ｒｆ３の少なくとも１つは含フッ素アルキル基）【選択図】なし