Electrolyte additive, electrolyte for lithium secondary battery containing the same, and lithium secondary battery
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2024-08-12
- Publication Date
- 2026-08-03
AI Technical Summary
【0029】 本発明の電解質添加剤はアニオン性化合物であって、相対的に(-)を呈する負極の表面での還元反応は抑えられ、相対的に(+)を呈する正極の表面での反応性が向上することで、正極の表面に耐久性の強いS-C-N被膜を形成し、正極の劣化を抑えることができる。したがって、本発明の電解質添加剤を含むリチウム二次電池用電解質を用いると、抵抗の増加を最小化するとともに、優れた高温貯蔵性および高温サイクル特性を有するリチウム二次電池を実現することができる。本発明の非水電解質は、高ニッケル系正極活物質またはシリコン系負極活物質といった高容量活物質とともに用いる高出力の電池に特に有用である。
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Abstract
Claims
1. An electrolyte for a lithium secondary battery comprising an electrolyte additive, The electrolyte additive contains a compound represented by the following chemical formula 1, The electrolyte additive is contained in the lithium secondary battery electrolyte in an amount of 0.1% to 5.0% by weight, and the electrolyte is a lithium secondary battery electrolyte: [Chemical formula 1] 【Chemistry 1】 In the above chemical formula 1, R is an alkyl group having 1 to 10 carbon atoms.
2. The electrolyte for a lithium secondary battery according to claim 1, wherein R is an alkyl group having 1 to 6 carbon atoms.
3. The electrolyte for a lithium secondary battery according to claim 1, wherein R is an alkyl group having 1 to 5 carbon atoms.
4. The electrolyte for a lithium secondary battery according to claim 1, wherein the compound represented by chemical formula 1 is at least one of the compounds represented by the following chemical formulas 1a to 1d. [Chemical formula 1a] 【Chemistry 2】 [Chemical formula 1b] 【Transformation 3】 [Chemical formula 1c] 【Chemistry 4】 [Chemical formula 1d] 【Transformation 5】
5. The electrolyte for a lithium secondary battery according to claim 4, wherein the compound represented by chemical formula 1 is at least one of the compounds represented by chemical formula 1a and chemical formula 1c.
6. The electrolyte for a lithium secondary battery according to claim 1, further comprising a lithium salt and a non-aqueous organic solvent.
7. The electrolyte for a lithium secondary battery according to claim 1, further comprising at least one other additive selected from the group consisting of cyclic carbonate compounds, halogen-substituted carbonate compounds, sultone compounds, sulfate compounds, phosphate compounds, borate compounds, nitrile compounds, benzene compounds, amine compounds, silane compounds, and lithium salt compounds.
8. Positive electrode and, The negative electrode and, A separator interposed between the positive electrode and the negative electrode, A lithium secondary battery comprising the electrolyte for a lithium secondary battery as described in claim 1.
9. The positive electrode includes a positive electrode active material. The lithium secondary battery according to claim 8, wherein the positive electrode active material comprises a lithium composite metal oxide comprising at least one metal selected from the group consisting of nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al), and lithium.