Non-aqueous electrolyte and lithium secondary battery comprising same
First Claim
1. A non-aqueous electrolyte for a lithium secondary battery, comprising:
- a lithium salt;
an organic solvent; and
an additive compound selected from the group consisting of bisphenol A, 2,3-dichloro-1,4-naphthoquinone, and combinations thereof, which initiates decomposition at between 4V and 5V and shows a constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry) wherein the additive compound is provided in an amount from 0.01 to 10 wt %, based on the total weight of electrolyte.
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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
27 Claims
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1. A non-aqueous electrolyte for a lithium secondary battery, comprising:
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a lithium salt; an organic solvent; and an additive compound selected from the group consisting of bisphenol A, 2,3-dichloro-1,4-naphthoquinone, and combinations thereof, which initiates decomposition at between 4V and 5V and shows a constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry) wherein the additive compound is provided in an amount from 0.01 to 10 wt %, based on the total weight of electrolyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A non-aqueous electrolyte for a lithium secondary battery comprising:
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a lithium salt; an organic solvent; an additive compound selected from the group consisting of bisphenol A, 2,3-dichloro-1,4-naphthoquinone, and combinations thereof, which initiates decomposition at between 4V and 5V and shows a first constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry); and
a second constant current maintenance at a voltage of at least 6.5V, wherein the additive compound is provided in an amount from 0.01 to 10 wt %, based on the total weight of electrolyte.
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23. A non-aqueous electrolyte for a lithium secondary battery comprising:
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a lithium salt; an organic solvent; and an additive compound selected from the group consisting of bisphenol A, 2,3-dichloro-1,4-naphthoquinone, and combinations thereof which initiates decomposition at between 4V and 5V and shows a constant current maintenance plateau region of at least 0.5V at measurement of LSV (linear sweep voltammetry), wherein the electrolyte shows exothermic peaks of less than or equal to about 100°
C. at overcharge of more than 12V, and wherein the additive compound is provided in an amount from 0.01 to 10 wt %, based on the total weight of electrolyte.
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24. A non-aqueous electrolyte for a lithium secondary battery comprising:
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a lithium salt; an organic solvent; and an additive compound selected from the group consisting of bisphenol A, 2,3-dichloro-1,4-naphthoquinone, and combinations thereof, wherein the additive compound is provided in an amount from 0.01 to 10 wt %, based on the total weight of electrolyte. - View Dependent Claims (25, 26, 27)
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Specification