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A negative electrode for lithium ion secondary batteries, including: a negative electrode current collector having a plurality of protrusions formed on a surface thereof; and a plurality of granular bodies, the granular bodies being supported on the protrusions, respectively, and including an alloy-formable active material capable of absorbing and releasing lithium ions, wherein: the granular bodies have a resin layer on their respective surfaces; and the resin layer includes a first resin component which is at least one selected from polyimides and polyacrylic acid, and a second resin component which is composed of a copolymer including vinylidene fluoride units and hexafluoropropylene units. A lithium ion secondary battery including the above negative electrode.

Titel:	NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY
Autor/in / Beteiligte Person:	Hiraoka, Tatsuki ; Yamamoto, Taisuke ; Kashiwagi, Katsumi ; Ugaji, Masaya
Link:	Zum Volltext
Veröffentlichung:	2012
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20120208084 Publication Date: August 16, 2012 Appl. No: 13/502068 Application Filed: April 26, 2011 Claim: 1. A negative electrode for lithium ion secondary batteries, comprising: a negative electrode current collector having a plurality of protrusions formed on a surface thereof; and a plurality of granular bodies, the granular bodies being supported on the protrusions, respectively, and including an alloy-formable active material capable of absorbing and releasing lithium ions, wherein the granular bodies each have a resin layer including: a first resin component which is at least one selected from polyimides and polyacrylic acid; and a second resin component which is composed of a copolymer including vinylidene fluoride units and hexafluoropropylene units. Claim: 2. The negative electrode for lithium ion secondary batteries in accordance with claim 1, wherein the thickness of the resin layer is 0.1 μm to 5 μm. Claim: 3. The negative electrode for lithium ion secondary batteries in accordance with claim 1, wherein, in the resin layer, the content of the first resin component is 50 mass % to 99 mass % and the content of the second resin component is 1 mass % to 50 mass %. Claim: 4. The negative electrode for lithium ion secondary batteries in accordance with claim 3, wherein the ratio between the content of the first resin component and the content of the second resin component is 1:0.2 to 1:1, by mass. Claim: 5. The negative electrode for lithium ion secondary batteries in accordance with claim 1, wherein the degree of swelling of the copolymer in a non-aqueous electrolyte, is 15% or more. Claim: 6. The negative electrode for lithium ion secondary batteries in accordance with claim 1, wherein the coverage of the resin layer on the surface of the granular body, is 30% to 100%. Claim: 7. The negative electrode for lithium ion secondary batteries in accordance with claim 6, wherein, at full charge, the coverage of the resin layer on the surface of the granular body is 50% to 100%. Claim: 8. The negative electrode for lithium ion secondary batteries in accordance with claim 1, wherein the alloy-formable active material is at least one selected from silicon-based active materials and tin-based active materials. Claim: 9. A lithium ion secondary battery comprising: a positive electrode capable of absorbing and releasing lithium ions; a negative electrode capable of absorbing and releasing lithium ions; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte, wherein the negative electrode is the negative electrode for lithium ion secondary batteries in accordance with claims 1. Current U.S. Class: 429/211 Current International Class: 01; 01; 01

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NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY