Electrode for a nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery, and method of manufacture of electrode for a nonaqueous electrolyte secondary battery

• US 8,968,930 B2
• Filed: 03/26/2012
• Issued: 03/03/2015
• Est. Priority Date: 03/31/2011
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: NISHINAKA, Shumpei, Matsuyama, Takahiro
• Primary Examiner(s): JELSMA, JONATHAN G
• Application Number:
  US13/429,753
• Publication Number:
  US 20120276447A1
• Time in Patent Office: 1,072 Days
• Field of Search: 429/211, 429/218.1, 429/232, 429/219
• US Class Current: 429/219
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• 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 4/621 Binders
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An electrode for a nonaqueous electrolyte secondary battery includes a current collector and an electrode material disposed on the current collector. the electrode material has a thickness of 50 μm or larger. The electrode material contains at least active material particles, an electro-conductive material, and a crack preventive material. An average particle diameter of the crack preventive material is two times or larger than an average particle diameter of the active material particles.

Claims

1. An electrode for a nonaqueous electrolyte secondary battery, comprising:

a current collector;

an electrode material disposed on the current collector;

wherein

the electrode material has a thickness of 50 μ

m or larger;

the electrode material contains at least active material particles, an electro-conductive material, and a crack preventive material;

an average particle diameter of the crack preventive material is two times or larger than an average particle diameter of the active material particles;

the crack preventive material has an average particle diameter larger than 10 μ

m and smaller than 180 μ

m;

the active material particles have an average particle diameter of 0.5 to 15 μ

m; and

wherein

a ratio of the active material particles contained in the electrode material and the crack preventive material contained in the electrode material is 100 parts by weight;

5-30 parts by weight.

2. The electrode according to claim 1, wherein

the active material particles are an oxide that contains lithium.

3. A nonaqueous electrolyte secondary battery, comprising:

a positive electrode and a negative electrode;

wherein

at least one of the positive electrode and the negative electrode is the electrode according to claim 1.

4. A nonaqueous electrolyte secondary battery, comprising:

a positive electrode and a negative electrode,

the negative electrode including;

a current collector; and

an electrode material disposed on the current collector;

wherein

the electrode material has a thickness of 50 μ

m or larger;

the electrode material contains at least active material particles, an electro-conductive material, and a crack preventive material;

an average particle diameter of the crack preventive material is two times or larger than an average particle diameter of the active material particles;

the crack preventive material has an average particle diameter larger than 10 μ

m and smaller than 180 μ

m;

the active material particles have an average particle diameter of 0.5 to 15 μ

m;

wherein

a ratio of the active material particles contained in the electrode material and the crack preventive material contained in the electrode material is 100 parts by weight;

5-30 parts by weight; and

the active material particles are one of Si, Sn, and a metal oxide that contains Si and Sn.

5. A method of manufacturing an electrode for a nonaqueous electrolyte secondary battery, comprising the steps for:

changing an electrode material into a slurry state by means of a solvent;

applying the slurry-state electrode material onto a current collector;

drying the electrode material to produce an electrode in which the electrode material has a thickness of 50 μ

m or larger;

wherein

the electrode material contains at least active material particles, an electro-conductive material, and a crack preventive material;

an average particle diameter of the crack preventive material is two times or larger than an average particle diameter of the active material particles;

the crack preventive material has an average particle diameter larger than 10 μ

m and smaller than 180 μ

m;

the active material particles have an average particle diameter of 0.5 to 15 μ

m; and

wherein

a ratio of the active material particles contained in the electrode material and the crack preventive material contained in the electrode material is 100 parts by weight;

5-30 parts by weight.