Patent ID: 9608291
Date: 2017-03-28
CPC Classifications: H01M,Y02E

Claim:
1. A non-aqueous liquid electrolyte secondary battery, comprising: a negative electrode comprising graphite and a negative-electrode active material containing Si atoms, a positive electrode capable of intercalating and deintercalating lithium ions, and a non-aqueous liquid electrolyte comprising wherein l represents an integer of 1 or larger and 10 or smaller, m represents an integer of 1 or larger and 100 or smaller, and n represents an integer of 1 or larger and 200 or smaller, α represents any atom selected from the group consisting of boron atom, carbon atom, nitrogen atom, oxygen atom and phosphorus atom; when m is 2 or larger, the two or more of α may be the same as or different from each other, X except such a compound in which α is boron atom and X wherein, i and j each represent, independently of each other, an integer of 2 or larger, and wherein the concentration of the first lithium salt in the non-aqueous liquid electrolyte is 0.5 mol/liter to 2.5 mol/liter, the concentration of the second lithium salt in the non-aqueous liquid electrolyte is 0.001 mol/liter to 1 mol/liter, and the molar ratio of the second lithium salt relative to the first lithium salt is 1 or smaller.