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US5916708A
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Fluorine-containing solvents for lithium batteries having increased safety
Assignee: Hoechst AG
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Filing: 1997-05-09
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Granted: 1999-06-29
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Expires: 2017-05-09
Abstract
Abstract The safety of secondary lithium cells is remarkedly enhanced when partially fluorinated ethers of the formulae RO-[(CH2)mO]n-CF2-CFH-X(I)and/or X-CFH-CF2O-[(CH2)mO]n-CF2-CFH-X(II)are being used, wherein R is a straight-chain alkyl group containing 1 to 10 carbon atoms or a branched alkyl group containing 3 to 10 carbon atoms, X is fluorine, chlorine or a perfluoroalkyl group containing 1 to 6 carbon atoms, which may also contain ethereal oxygen, m is an integer from 2 to 6 and n is an integer from 1 to 8. Preferred are compounds of the formula (I), wherein R is a methyl group, X is fluorine, m is 2 and n is an integer from 1 to 3 and also compounds of the formula (II), wherein m is 2 and n is an integer from 1 to 3.
Inventors
- 👤 Jurgen Otto Besenhard
- 👤 Konrad von Werner
- 👤 Martin Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:17
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/60; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M2300/0028; H01M2300/0034; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
An electrolyte which comprises at least one partially fluorinated ether chosen from the group consisting of formula (I) ##STR2## in which R is a straight-chain alkyl group containing 1 to 10 carbon atoms or a branched alkyl group containing 3 to 10 carbon atoms, X is fluorine, chlorine or a perfluoroalkyl group containing 1 to 6 carbon atoms, which optionally contains ethereal oxygen, m is an integer from 2 to 6 and n is an integer from I to 8, formula (II) X--CFH--CF.sub.2 O-- (CH.sub.2).sub.m O!,--CF.sub.2 --CFH--X(II) in which X, m and n have the abovementioned meanings and mixtures of formula I and formula II.
Claim 2
Dependent Claim
105 words
An electrolyte which comprises at least one partially fluorinated ether chosen from the group consisting of formula (I) ##STR2## in which R is a straight-chain alkyl group containing 1 to 10 carbon atoms or a branched alkyl group containing 3 to 10 carbon atoms, X is fluorine, chlorine or a perfluoroalkyl group containing 1 to 6 carbon atoms, which optionally contains ethereal oxygen, m is an integer from 2 to 6 and n is an integer from I to 8, formula (II) X--CFH--CF.sub.2 O-- (CH.sub.2).sub.m O!,--CF.sub.2 --CFH--X(II) in which X, m and n have the abovementioned meanings and mixtures of formula I and formula II.
Claim 3
Dependent Claim
13 words
An electrolyte as claimed in claim 1, wherein X is fluorine or trifluoromethyl.
Claim 4
Dependent Claim
44 words
An electrolyte as claimed in claim 1, wherein, in formula (I), R is a methyl group, X is fluorine, m is 2 and n is 1 to 3 and, in formula (II), X is fluorine, m is 2 and n is 1 to 3.
Claim 5
Dependent Claim
25 words
An electrolyte as claimed in claim 1, wherein the content of partially fluorinated ethers is 5 to 70% by volume of the total electrolyte system.
Claim 6
Dependent Claim
25 words
The electrolyte as claimed in claim 4, wherein the content of partially fluorinated ethers is 20 to 50% by volume of the total electrolyte system.
Claim 7
Dependent Claim
15 words
An electrolyte as claimed in claim 1, which further comprises ethylene carbonate and/or propylene carbonate.
Claim 8
Dependent Claim
52 words
An electrolyte as claimed in claim 1, wherein, to stabilize ethers of the formulae (I) and (II), a tertiary aliphatic amine is used which has a boiling point of at least 100° C. at normal pressure and of which 0.1 to 1.0% by weight in relation to the fluorine-containing ether is used.
Claim 9
Dependent Claim
16 words
A secondary lithium battery having increased safety which comprises the electrolyte as claimed in claim 1.
Claim 10
Dependent Claim
23 words
The electrolyte as claimed in claim 1, which further comprises a fluorinated ether of the formula ##STR3## wherein n is 1 or 2.
Claim 11
Dependent Claim
19 words
An electrolyte which comprises at least one fluorinated ether of the form ##STR4## wherein n is 1 or 2.
Claim 12
Dependent Claim
19 words
An electrolyte which comprises at least one fluorinated ether of the form ##STR4## wherein n is 1 or 2.
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