| abstract |
FIELD: electricity. n SUBSTANCE: present invention relates to lithium-ion secondary battery with electrode element, in which positive electrode and a negative electrode are arranged so as to be opposite each other, an electrolyte solution and external housing of container for storage of electrode element and electrolyte solution, in which: negative electrode is formed using second active material, which is obtained by doping lithium first active material, which contains metal (a), capable of forming alloy with lithium, (b) metal oxide, capable of absorbing and desorbing lithium ions and carbon-containing material (c), capable of absorbing and desorbing lithium ions; and an electrolyte solution contains a compound based on fluorinated ether represented by predetermined formula, in which there is an alkyl group or fluorine-substituted alkyl group. n EFFECT: high energy density and efficiency of charge-discharge cycle lithium-ion battery. n 13 cl, 1 dwg, 1 tbl, 11 ex |