A negative electrode composition, a negative electrode for a lithium secondary battery containing the same, and a lithium secondary battery containing the negative electrode
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2022-12-14
- Publication Date
- 2026-06-09
AI Technical Summary
【0017】 本発明の一実施態様による負極組成物は、4つ以上のエポキシ官能基を有するエポキシ樹脂と、カルボキシ基を含む水溶性高分子重合体とを含む熱架橋性負極バインダー溶液を負極組成物に含むことを主な特徴とする。
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Abstract
Claims
1. A thermally crosslinkable negative electrode binder solution comprising an epoxy resin having four or more epoxy functional groups and a water-soluble polymer containing carboxyl groups; Negative electrode active material; and A negative electrode composition containing a negative electrode conductive material, The epoxy resin is contained in an amount of 0.1 parts by weight or more and 25 parts by weight or less per 100 parts by weight of the aforementioned thermally crosslinkable negative electrode binder solution. The epoxy resin having four or more epoxy functional groups further comprises at least one functional group selected from the group consisting of hydroxyl groups and carboxyl groups, The aforementioned negative electrode active material includes a silicon-based active material. The silicon-based active material is a negative electrode composition having an average particle size (D50) of 1 μm to 10 μm.
2. The anode composition according to claim 1, wherein the thermally crosslinkable anode binder solution is contained in an amount of 1 to 20 parts by weight based on 100 parts by weight of the anode composition.
3. The negative electrode composition according to claim 1, wherein the weight-average molecular weight of the water-soluble polymer is 100,000 g / mol or more and 3,000,000 g / mol or less.
4. The negative electrode composition according to claim 1, wherein the water-soluble polymer comprises at least one selected from the group consisting of carboxymethylcellulose and its derivatives; water-soluble polyacrylic acid (PAA); polyvinyl alcohol (PVA); polyacrylonitrile (PAN); and polyacrylamide (PAM).
5. The negative electrode composition according to claim 1, wherein the negative electrode conductive material comprises at least one selected from the group consisting of a point conductive material; a planar conductive material; and a linear conductive material.
6. The negative electrode composition according to claim 1, wherein the negative electrode active material further comprises a carbon-based active material.
7. The aforementioned silicon-based active material is SiO ｘ (x=0) and SiO ｘ It comprises one or more selected from the group consisting of (0 < x < 2), and based on 100 parts by weight of the silicon-based active material, the SiO ｘ The negative electrode composition according to claim 1, comprising 70 parts by weight or more of (x=0).
8. The negative electrode composition according to claim 1, wherein the negative electrode active material is 60 parts by weight or more based on 100 parts by weight of the negative electrode composition.
9. Negative electrode current collector layer; and A negative electrode active material layer comprising the negative electrode composition according to any one of claims 1 to 8, formed on one or both sides of the negative electrode current collector layer; A negative electrode for lithium secondary batteries, including...
10. The thickness of the negative electrode current collector layer is 1 μm or more and 100 μm or less. The negative electrode for a lithium secondary battery according to claim 9, wherein the thickness of the negative electrode active material layer is 20 μm or more and 500 μm or less.
11. The negative electrode for a lithium secondary battery according to claim 9, wherein the rate of change in the thickness of the negative electrode active material layer satisfies the following formula 1: [Formula 1] 0%≦[(X2-X1) / X1]×100(%)≦15% In the above formula 1, X1 is the thickness of the negative electrode active material layer of the lithium secondary battery negative electrode at 0 cycles, X2 is the thickness of the negative electrode active material layer after 30 cycles of the negative electrode for the lithium secondary battery.
12. positive electrode; A negative electrode for a lithium secondary battery according to claim 9; A separation membrane provided between the positive electrode and the negative electrode; and A lithium secondary battery containing an electrolyte.