Non-aqueous electrolyte secondary battery

• US 7,374,842 B2
• Filed: 04/28/2004
• Issued: 05/20/2008
• Est. Priority Date: 04/30/2003
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Battery Industrial Company, Limited (Panasonic Holdings Corporation)
• Inventors: Ota, Kazuhiro, Yamaura, Junichi, Ozaki, Yoshiyuki, Fujii, Takabumi
• Primary Examiner(s): Maples; John S
• Application Number:
  US10/833,141
• Publication Number:
  US 20040219431A1
• Time in Patent Office: 1,483 Days
• Field of Search: None
• US Class Current: 429/231.8
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2010/4292 Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
• 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 4/1395 of electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A non-aqueous electrolyte secondary battery, comprises positive and negative electrode plates, each comprising a current collector and a material mixture layer carried on each face thereof. A total thickness of the positive electrode material mixture layers on both faces of the current collector is 40 μm to 100 μm. The positive electrode plate has an electrode area of 520 cm² to 800 cm² per battery capacity of 1 Ah. The negative electrode material mixture layer comprises a graphitizable carbon material. A wide-range X-ray diffraction pattern of the graphitizable carbon material has a peak PX (101) attributed to a (101) crystal face at about 2θ=44 degrees, and a peak PX (100) attributed to a (100) crystal face at about 2θ=42 degrees. A ratio of an intensity IX (101) of PX (101) to an intensity IX (100) of PX(100) satisfies: 0<IX (101)/IX (100)<1.

Claims

1. A non-aqueous electrolyte secondary battery, comprising:

(a) a positive electrode plate comprising a positive electrode current collector and a positive electrode material mixture layer carried on each face of said positive electrode current collector;

(b) a non-aqueous electrolyte; and

(c) a negative electrode plate comprising a negative electrode current collector and a negative electrode material mixture layer carried on each face of said negative electrode current collector, wherein

said positive electrode material mixture layer comprises a lithium-containing composite oxide, a total thickness of said positive electrode material mixture layers on both faces of said positive electrode current collector is not smaller than 40 μ

m and not larger than 100 μ

m, said positive electrode plate has an electrode area of not smaller than 520 cm² and not larger than 800 cm² per battery capacity of 1 Ah,

said negative electrode material mixture layer comprises a graphitizable carbon material capable of absorbing and desorbing lithium, a wide-range X-ray diffraction pattern of said graphitizable carbon material, which is measured by means of CuKα

rays, has a peak PX (101) attributed to a (101) crystal face at an angle of about 2θ

=44 degrees, and a peak PX (100) attributed to a (100) crystal face at an angle of about 2θ

=42 degrees, and a ratio of an intensity IX (101) of PX (101) to an intensity IX (100) of PX(100) satisfies the formula (1);

0<

IX(101)/IX(100)<

1.

2. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said negative electrode plate has a specific density of not smaller than 170 Ah/kg and not larger than 250 Ah/kg when the non-aqueous electrolyte secondary battery is in a fully charged state.

3. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein a thickness Lc (004) of a crystallite in a c-axis direction of said graphitizable carbon material is not smaller than 20 nm and smaller than 60 nm, and a thickness La (110) of a crystallite in an a-axis direction of said graphitizable carbon material is smaller than Lc (004).

4. The non-aqueous electrolyte secondary battery in accordance with claim 1, wherein said negative electrode material mixture layer further comprises graphite and a percentage of said graphitizable carbon material content in the total amount of said graphite and said graphitizable carbon material is not smaller than 50 wt % and not larger than 80 wt %.

5. The non-aqueous electrolyte secondary battery in accordance with claim 4, wherein said negative electrode plate has a specific density of not smaller than 170 Ah/kg and not larger than 300 Ah/kg when the non-aqueous electrolyte secondary battery is in a fully charged state.

6. The non-aqueous electrolyte secondary battery in accordance with claim 4, wherein a wide-range X-ray diffraction pattern of said graphite, which is measured by means of CuKα

rays, has a peak PY (101) attributed to a (101) crystal face at an angle of about 2θ

=44 degrees, and a peak PY (100) attributed to a (100) crystal face at an angle of about 2θ

=42 degrees, and a ratio of an intensity IY (101) of PY (101) to an intensity IY (100) of PY (100) satisfies the formula (2);

1.5<

IY(101)/IY(100)<

2.5.