IP Library Granted Patent US 9,005,821
Granted Patent B2
US 9,005,821 · App. 12/704,049 · Granted Apr 14, 2015

Secondary battery

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Quick Facts
Patent No.
US 9,005,821
App. No.
12/704,049
Granted
Apr 14, 2015
Kind
B2
Abstract

A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode; and a nonaqueous electrolyte, wherein an open circuit voltage in a completely charged state per pair of a positive electrode and a negative electrode is from 4.25 to 6.00 V; and at least one member selected from the group consisting of sulfonic anhydrides represented by the following formulae (1) to (4) is contained in a nonaqueous electrolytic solution

Claims (20)

1. A nonaqueous electrolyte secondary battery comprising:

a positive electrode including a positive active material;

a negative electrode including a negative active material; and

a nonaqueous electrolyte containing, as a solvent, at least one member selected from the group consisting of a halogen-containing chain carbonate and a halogen-containing cyclic carbonate, the halogen-containing chain carbonate being at least one member selected from the group consisting of fluoromethyl methyl carbonate, difluoromethyl methyl carbonate and bis(fluoromethyl) carbonate, and the halogen-containing cyclic carbonate being at least one member selected from the group consisting of 4-fluoro-1,3-dioxolan-2-one and 4,5-difluoro-1,3-dioxolan-2-one,

wherein an open circuit voltage in a completely charged state per pair of a positive electrode and a negative electrode is from 4.25 to 6.00 V, wherein the positive active material and the negative active material are adjusted in an amount corresponding to the open circuit voltage; and

at least one member selected from the group consisting of sulfonic anhydrides represented by the following formulae (1) to (4) is contained in a nonaqueous electrolytic solution, an amount of the sulfonic anhydride in the nonaqueous electrolytic solution ranging from more than 0.5% by mass and not more than 5% by mass, wherein

R1 represents an optionally substituted alkylene group having from 2 to 4 carbon atoms, an optionally substituted alkenylene group having from 2 to 4 carbon atoms or an optionally substituted crosslinking ring; and the substituent represents a halogen atom or an alkyl group;

wherein

each of R3 to R6 independently represents hydrogen, an alkyl group, a halogenated alkyl group or a halogen group and may form a ring each other; wherein

R2 represents an optionally substituted alkylene group having from 2 to 4 carbon atoms, an optionally substituted alkenylene group having from 2 to 4 carbon atoms or an optionally substituted crosslinking ring; and the substituent represents a halogen atom or an alkyl group; and wherein

each of R7 to R10 independently represents hydrogen, an alkyl group, a halogenated alkyl group or a halogen group and may form a ring each other.

2. The secondary battery according to claim 1 , wherein

the electrolyte contains, as an electrolyte salt, at least one member selected from the group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium perchlorate (LiClO 4 ) and lithium hexafluoroarsenate (LiAsF 6 ).

3. The secondary battery according to claim 1 , wherein

the sulfone compound represented by the formula (1) is at least one member selected from the group consisting of compounds represented by the following formulae (1-1) and (1-2):

4. The secondary battery according to claim 1 , wherein

the sulfone compound represented by the formula (3) is a compound represented by the following formula (3-1):

5. The secondary battery according to claim 1 , wherein

the sulfonic anhydride represented by the formula (4) is a compound represented by the following formula (4-1):

6. The nonaqueous electrolyte secondary battery of claim 1 comprising LiMn 0.5 Ni 0.5 O 2 as a coating on a surface of the positive active material.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 22, 2018
From: TOHOKU MURATA MANUFACTURING CO., LTD
To: MURATA MANUFACTURING CO., LTD.
Reel/Frame 045103/0835 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 22, 2018
From: SONY CORPORATION
To: TOHOKU MURATA MANUFACTURING CO.,LTD
Reel/Frame 045104/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 10, 2012
From: ODANI, TORU; KUBOTA, TADAHIKO
To: SONY CORPORATION
Reel/Frame 028524/0157 →