NON-AQUEOUS ELECTROLYTE AND LITHIUM SECONDARY BATTERY COMPRISING SAME
First Claim
1. A lithium secondary battery comprising:
- a positive electrode including a material that reversibly intercalates/deintercalates lithium ions;
a negative electrode selected from the group consisting of lithium metal, a lithium-containing alloy, a material that reversibly forms a lithium-containing compound as a positive active material, a material that reversibly intercalates/deintercalates the lithium ions, and combinations thereof; and
a non-aqueous electrolyte wherein the non-aqueous electrolyte comprises;
a lithium salt;
an organic solvent; and
an additive compound which initiates decomposition at from 4V to 5V and shows a constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry).
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Accused Products
Abstract
An electrolyte for a lithium secondary battery includes lithium salts, a non-aqueous organic solvent, and additive compounds, which initiates decomposition at 4V to 5V and show a constant current maintenance plateau region of more than or equal to 0.5V at measurement of LSV (linear sweep voltammetry). The additive compounds added to the electrolyte of the present invention decompose earlier than the organic solvent to form a conductive polymer layer on the surface of a positive electrode by increased electrochemical energy and heat at overcharge. The conductive polymer layer prevents decomposition of the organic solvent. Accordingly, the electrolyte inhibits gas generation caused by decomposition of the organic solvent during high temperature storage, and also improves safety of the battery during overcharge.
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Citations
3 Claims
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1. A lithium secondary battery comprising:
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a positive electrode including a material that reversibly intercalates/deintercalates lithium ions; a negative electrode selected from the group consisting of lithium metal, a lithium-containing alloy, a material that reversibly forms a lithium-containing compound as a positive active material, a material that reversibly intercalates/deintercalates the lithium ions, and combinations thereof; and a non-aqueous electrolyte wherein the non-aqueous electrolyte comprises; a lithium salt; an organic solvent; and an additive compound which initiates decomposition at from 4V to 5V and shows a constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry). - View Dependent Claims (2, 3)
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Specification