LITHIUM SECONDARY BATTERY

• Main Authors: MIZUTANI MAMORU, WATANABE HIDEAKI, TSUJIKO AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 19.07.2018
• 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 novel lithium secondary battery in which a positive electrode active material of a high potential is used, and which enables the further improvement in charge and discharge characteristics.SOLUTION: A lithium secondary battery 20 comprises: a positive electrode 22 including a positive electrode active material; a negative electrode 23 including a negative electrode active material consisting of a carbonaceous material capable of occluding and releasing lithium ions; and a nonaqueous electrolyte 27 interposed between the positive electrode 22 and the negative electrode 23 and conducting lithium ions. The nonaqueous electrolyte 27 contains a fluorine-containing phenol compound of which the number of substitutions of fluorine is 2 or less.SELECTED DRAWING: Figure 1 【課題】高電位な正極活物質を用いたリチウム二次電池において、充放電特性をより向上する新規なものを提供する。【解決手段】リチウム二次電池２０は、正極活物質を含む正極２２と、リチウムイオンを吸蔵放出する炭素質材料の負極活物質を含む負極２３と、正極２２と負極２３との間に介在しリチウムイオンを伝導する非水系電解液２７とを備えたものである。この非水系電解液２７には、フッ素の置換数が２以下のフッ素含有フェノール化合物が含まれている。【選択図】図１