Non-aqueous electrolyte secondary battery

Details Non-aqueous electrolyte secondary battery Non-aqueous electrolyte secondary battery

H - Electricity

01

M

H01M 10/0525 (2010.01) H01M 4/131 (2010.01) H01M 4/485 (2010.01)

Patent

CA 2233128

In a nonaqueous electrolyte secondary cell having positive and negative electrodes made of a material capable of doping and removing (de-doping) lithium and a nonaqueous electrolyte prepared by dissolving an electrolyte in a nonaqueous solvent, flake-like graphite which is highly crystalline and has high electron conductivity is added as a conductor agent to the positive and negative electrodes. In addition to this flake-like graphite, granular carbon having specific physical properties or carbon black is added as the conductor agent. As a result, a nonaqueous electrolyte secondary cell having a long cycle life and a high reliability can be obtained.

L'invention concerne une cellule électrolytique secondaire non aqueuse possédant des électrodes positive et négative, constituées d'un matériau assurant le dopage et l'extraction (de-dopage) du lithium, et un électrolyte non aqueux préparé en dissolvant un électrolyte dans un solvant non aqueux. Dans cette cellule, on ajoute un graphite de type paillettes qui est fortement cristallin et présente une forte conductivité d'électrons comme agent conducteur pour les électrodes positive et négative. Outre ce graphite de type paillettes, on ajoute un carbone granulaire présentant des propriétés physiques spécifiques ou un noir de carbone comme agent conducteur. Par conséquent, on obtient une cellule électrolytique secondaire non aqueuse présentant un grand durée de cycle et une grande fiabilité.

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