IP Library Granted Patent US 7,175,939
Granted Patent B2
US 7,175,939 · App. 10/663,713 · Granted Feb 13, 2007

Non-aqueous electrolyte secondary battery

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Quick Facts
Patent No.
US 7,175,939
App. No.
10/663,713
Granted
Feb 13, 2007
Kind
B2
Abstract

In a non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode using carbon material as negative electrode active material, and a non-aqueous electrolyte solution, the non-aqueous electrolyte solution contains at least a saturated cyclic carbonic ester and a cyclic carbonic ester having C═C double bond where an amount of the cyclic carbonic ester having C═C double bond is in a range of 1.0×10 −8 to 13.0×10 −5 g per negative electrode capacity of 1 mAh.

Claims (28)

1. A non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode using carbon material as negative electrode active material, and a non-aqueous electrolyte solution, wherein

said non-aqueous electrolyte solution contains at least a saturated cyclic carbonic ester and a cyclic carbonic ester having C═C double bond where an amount of the cyclic carbonic ester having C═C double bond is in a range of 1.0×10 −8 to 13.0×10 −5 g per negative electrode capacity of 1 mAh.

2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

said carbon material as the negative electrode active material is graphite-containing carbon material.

3. The non-aqueous electrolyte secondary battery according to claim 2 , wherein

said graphite-containing carbon material has spacing of (002) Plane, d 002 , in the range of 0.335 to 0.338 nm and crystallite whose size along c-axis length (Lc) is not less than 30 nm as measured by X-ray diffraction analysis.

4. The non-aqueous electrolyte secondary battery according to claim 2 , wherein

said the graphite-containing carbon material has a ratio (I 110 /I 002 ) of a peak intensity I 110 of (110) Plane based on the peak intensity I 002 of the (002) Plane in the range of 5×10 −3 to 15×10 −3 as measured by X-ray diffraction analysis.

5. The non-aqueous electrolyte secondary battery according to claim 2 , wherein

said graphite-containing carbon material has an R value (I D /I G ) as measured by Raman spectroscopy in the range of 0.15 to 0.7.

6. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

the amount of the negative electrode active material in said negative electrode is in the range of 1.0 to 12 mg/cm 2 .

7. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

the cyclic carbonic ester having C═C double bond in said non-aqueous electrolyte solution is at least one of vinylene carbonate, 4,5-dimethyl vinylene carbonate, 4,5-diethyl vinylene carbonate, 4,5-dipropyl vinylene carbonate, 4-ethyl-5-methyl vinylene carbonate, 4-ethyl-5-propyl vinylene carbonate, 4-methyl-5-propyl vinylene carbonate, and vinyl ethylene carbonate.

8. The non-aqueous electrolyte secondary battery according to claim 7 , wherein

the cyclic carbonic ester having C═C double bond in said non-aqueous electrolyte solution is vinylene carbonate.

9. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

the saturated cyclic carbonic ester in said non-aqueous electrolyte solution is at least one of ethylene carbonate, propylene carbonate, and butylene carbonate.

10. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

said non-aqueous electrolyte solution contains chain carbonic ester.

11. The non-aqueous electrolyte secondary battery according to claim 10 , wherein

said chain carbonic ester is at least one of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, and methyl isopropyl carbonate.

12. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

positive electrode active material in said positive electrode contains lithium-manganese-containing composite oxide having a spinel structure and lithium-nickel-cobalt-manganese composite oxide.

13. The non-aqueous electrolyte secondary battery according to claim 12 , wherein

said lithium-manganese-containing composite oxide having the spinel structure is represented by a general formula Li x Mn 2−y1 M1 y2 O 4+z (wherein M1 denotes at least one element selected from a group consisting of Al, Co, Ni, Mg, and Fe, and relationships 0≦x≦1.5, 0≦y1≦1.0, 0≦y2≦0.5, and −0.2≦z≦0.2 are satisfied), and said lithium-nickel-cobalt-manganese composite oxide is represented by the general formula Li a Ni b Co c Mn d O 2 (wherein the relationships 0≦a≦1.2 and b+c+d=1 are satisfied).

14. The non-aqueous electrolyte secondary battery according to claim 12 , wherein

the positive electrode active material contains the lithium-manganese-containing composite oxide having the spinel structure and the lithium-nickel-cobalt-manganese composite oxide in a weight ratio of 20:80 to 80:20.

Assignments (1)
NUNC PRO TUNC ASSIGNMENT Recorded Aug 29, 2023
From: SANYO ELECTRIC CO., LTD.
To: PANASONIC ENERGY CO., LTD.
Reel/Frame 064745/0405 →