Non-aqueous electrolyte secondary battery

• US 20070099081A1
• Filed: 06/06/2006
• Published: 05/03/2007
• Est. Priority Date: 06/06/2005
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Matsuda, Hiroaki, Ishida, Sumihito
• Application Number:
  US11/447,038
• Publication Number:
  US 20070099081A1
• Time in Patent Office: Days
• US Class Current: 429/217
• CPC Class Codes: B22F 1/08 Metallic powder characterised by particles having an amorphous microstructure
• CPC Class Codes: B22F 1/10 Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
• CPC Class Codes: B22F 1/142 Thermal or thermo-mechanical treatment
• CPC Class Codes: B22F 1/16 Metallic particles coated with a non-metal coated with lubricating or binding agents or with organic material B22F1/10
• CPC Class Codes: B22F 1/17 Metallic particles coated with metal
• CPC Class Codes: B22F 1/18 Non-metallic particles coated with metal
• CPC Class Codes: B22F 2201/013 Hydrogen
• CPC Class Codes: B22F 2201/11 Argon
• CPC Class Codes: B22F 2201/12 Helium
• CPC Class Codes: B22F 2201/30 Carburising atmosphere
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/38 : of elements or alloys
• CPC Class Codes: H01M 4/485 : of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/587 : for inserting or intercalating light metals
• CPC Class Codes: H01M 4/621 : Binders
• CPC Class Codes: H01M 4/622 : being polymers
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries

Abstract

A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive and negative electrodes, and a non-aqueous electrolyte. The negative electrode includes composite particles and a binder. Each of the composite particles includes: a negative electrode active material including an element capable of being alloyed with lithium; carbon nanofibers that are grown from a surface of the negative electrode active material; and a catalyst element for promoting the growth of the carbon nanofibers. The binder comprises at least one polymer selected from the group consisting of polyimide, polyamide imide, polyamide, aramid, polyarylate, polyether ether ketone, polyether imide, polyether sulfone, polysulfone, polyphenylene sulfide, and polytetrafluoroethylene.

Claims

1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between said positive and negative electrodes, and a non-aqueous electrolyte,

wherein said negative electrode comprises composite particles and a binder,

each of said composite particles comprises:

a negative electrode active material comprising an element capable of being alloyed with lithium;

carbon nanofibers that are grown from a surface of said negative electrode active material; and

a catalyst element for promoting the growth of the carbon nanofibers; and

said binder comprises at least one polymer selected from the group consisting of polyimide, polyamide imide, polyamide, aramid, polyarylate, polyether ether ketone, polyether imide, polyether sulfone, polysulfone, polyphenylene sulfide, and polytetrafluoroethylene.

2. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said element capable of being alloyed with lithium is at least one selected from the group consisting of Si and Sn.

3. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said negative electrode active material is at least one selected from the group consisting of a simple substance of silicon, a silicon oxide, a silicon alloy, a simple substance of tin, a tin oxide, and a tin alloy.

4. A negative electrode for a non-aqueous electrolyte secondary battery,

wherein said negative electrode comprises composite particles and a binder,

each of said composite particles comprises:

a negative electrode active material comprising an element capable of being alloyed with lithium;

carbon nanofibers that are grown from a surface of said negative electrode active material; and

a catalyst element for promoting the growth of the carbon nanofibers; and

said binder comprises at least one polymer selected from the group consisting of polyimide, polyamide imide, polyamide, aramid, polyarylate, polyether ether ketone, polyether imide, polyether sulfone, polysulfone, polyphenylene sulfide, and polytetrafluoroethylene.