Lithium battery, polymer electrolyte, electrolyte material, di(meth)acrylic ester, and di(meth)acrylate polymer

• US 6,569,572 B1
• Filed: 04/11/2000
• Issued: 05/27/2003
• Est. Priority Date: 08/11/1998
• Status: Expired due to Term

• Current Assignee: GS Yuasa International Ltd. (GS Yuasa Corporation), Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Original Assignee: GS Yuasa Corporation, Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Inventors: Shindo, Masaharu, Ishitoku, Takeshi, Nogi, Hidenobu, Ochiai, Seijiro, Izuchi, Syuichi
• Primary Examiner(s): Kalafut, Stephen
• Application Number:
  US09/529,273
• Time in Patent Office: 1,141 Days
• Field of Search: 429/303, 429/317, 558/265, 558/276
• US Class Current: 429/303
• CPC Class Codes: C07C 69/96 Esters of carbonic or haloformic acids
• CPC Class Codes: C08F 20/28 containing no aromatic rings in the alcohol moiety
• CPC Class Codes: C08F 22/20 Esters containing oxygen in addition to the carboxy oxygen
• CPC Class Codes: H01B 1/122 Ionic conductors
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 2300/0085 Immobilising or gelification of electrolyte
• CPC Class Codes: H01M 6/22 Immobilising of electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

In a lithium battery comprising a positive electrode, a negative electrode and a gel electrolyte; the gel electrolyte is composed of at least an ester-group or ether-group aprotic polar solvent, a lithium salt and a polymeric compound, and the polymeric compound comprises a polymer of at least one compound among those expressed by an equation (I) and an equation (II).

(k: zero or number of 1 or more, m: number of 1 or more, R₁:C_pH_2p, R₂:C_qH_2q, p≠q, p & q: integer of 1 or more, A: CH₂═CH—CO— or CH₂═C(CH₃)—CO—, X: n-valent combination group (n: integer ranging from 1 to 4), r: zero or number of 1 or more, s: number of 1 or more, R₃: C_tH_2t, R₄: C_uH_2u, t≠u, t & u: integer of 1 or more).

Claims

1. A lithium battery comprising:

a positive electrode;

a negative electrode; and

a gel electrolyte, wherein the gel electrolyte is composed of at least an ester-group or ether-group aprotic polar solvent, a lithium salt and a polymeric compound, and the polymeric compound comprises a polymer of at least one compound among those expressed by formula (I) and formula (II);

 

wherein;

k is zero or more,

m is 1 or more,

R₁ is C_pH_2p,

R₂ is C_qH_2q,

p≠

q,

p and q are integers of 1 or more,

A is CH₂═

CH—

CO—

or CH₂═

C(CH₃)—

CO—

,

X is an n-valent combination group, wherein n is an integer ranging from 1 to 4,

r is zero or more,

s is 1 or more,

R₃ is C_tH_2t,

R₄ is C_uH_2u,

t≠

u,

t and u are integers of 1 or more, and u≠

2 when r=0.

2. A lithium battery as set forth in claim 1, in which a number-average molecular weight of the compound expressed by the formula (I) ranges from 160 to 100,000.

3. A lithium battery as set forth in claim 1, in which a number-average molecular weight of the compound expressed by the formula (II) ranges from 228 to 100,000.

4. A lithium battery as set forth in claim 1, in which the polymeric compound comprises a copolymer of at least one compound among those expressed by the formula (I) and the formula (II), with an another monomer, and

a content of the compound expressed by the formula (I) and the formula (II) in the copolymer is larger than or equal to 50 wt %.

5. A lithium battery as set forth in claim 1, in which the polymeric compound comprises a polymer alloy of at least a polymer of one compound among those expressed by the formula (I) and the formula (II), with an another polymeric compound, and

a content of the polymer of the compound expressed by the formula (I) and the formula (II) in the polymer alloy is larger than or equal to 50 wt %.

6. A polyelectrolyte containing at least a polymer of a compound expressed by an formula (XX):

wherein

R₁ and R₂ are H or CH₃, wherein R₁ may be same with or differ from R₂,

n is an integer ranging from 1 to 1,000.

7. An electrolyte material comprising a compound expressed by an formula (XX):

wherein

R₁ and R₂ are H or CH₃ and R₁ may be same with or differ from R₂,

n is an integer ranging from 1 to 1,000.

8. An electrolyte material comprising a polymer of a compound expressed by an formula (XX):

wherein

R₁ and R₂ are H or CH₃ and R₁ may be same with or differ from R₂,

n is an integer ranging from 1 to 1,000.

9. A di(metha)-acrylic ester expressed by an formula (XX):

wherein

R₁ and R₂ are H or CH₃ and R₁ may be same with or differ from R₂,

n is an integer ranging from 1 to 1,000.

10. A di(metha)-acrylate polymer forming a polymer of a compound expressed by an formula (XX):

wherein

R₁ and R₂ are H or CH₃ and R₁ may be same with or differ from R₂,

n is an integer ranging from 1 to 1,000.