US4880714A
Expired / Lapsed
US
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Method for preparing non-aqueous electrolytes
Assignee: Gillette Co LLC
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Filing: 1989-02-27
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Granted: 1989-11-14
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Expires: 2009-02-27
Abstract
Abstract This invention relates to an improved method for preparing a non-aqueous electrolyte comprising lithium hexafluorophosphate, LiPF 6 , and electrochemical cells containing same. In particular the method involves forming LiPF 6 by a chemical reaction in the presence of an ether, whereby a complex of LiPF 6 and the ether is formed and readily isolated. An electrolyte is prepared by dissolving the complex in non-aqueous solvents to the desired concentration.
Inventors
- 👤 William L. Bowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:30
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/005; H; H01; H01M; H01M6/00; H01M6/14; H01M6/16; H01M6/162; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
A method for preparing an improved electrolyte containing LiPF 6 for use in an electrochemical cell comprising dissolving a salt, having a cation comprising an adduct of a proton and a Lewis base, and an anion comprising PF 6 - , in a solvent comprising an ether capable of forming an isolatable complex with LiPF 6 ; adding a lithium base to the solution whereby LiPF 6 and the complex of LiPF 6 and ether are formed simultaneously; and isolating the LiPF 6 -ether complex.
Claim 2
Independent Claim
85 words
A method for preparing an improved electrolyte containing LiPF 6 for use in an electrochemical cell comprising dissolving a salt, having a cation comprising an adduct of a proton and a Lewis base, and an anion comprising PF 6 - , in a solvent comprising an ether capable of forming an isolatable complex with LiPF 6 ; adding a lithium base to the solution whereby LiPF 6 and the complex of LiPF 6 and ether are formed simultaneously; and isolating the LiPF 6 -ether complex.
Claim 3
Dependent Claim
47 words
The method of claim 1 wherein the salt has the general formula (XH)PF 6 wherein X is a Lewis base containing an element of Group 5A of the Periodic Chart of the Elements and H is a proton, whereby the adduct XH has a charge of +1.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein X comprises an element selected from the group consisting of nitrogen and phosphorous.
Claim 5
Dependent Claim
42 words
The method of claim 2 wherein X is selected from the group consisting of NH 3 , NRH 2 , NRR'H, and NRR'R" where R, R', and R" are the same or different C 1 to C 4 alkyl groups, and pyridine.
Claim 6
Dependent Claim
40 words
The method of claim 2 wherein X is selected from the group consisting of PH 3 , PRH 2 , PRR'H, and PRR'R" where R, R', and R'" are the same or different C 1 to C 4 alkyl groups.
Claim 7
Dependent Claim
46 words
The method of claim 2 wherein the lithium base is selected from the group consisting of LiH, LiOR (R is an alkyl), LiNH 2 , LiNRH and LiNRR' (where R and R" are the same or different alkyls), lithium naphthalenide, lithium benzophenone ketyl, and butyl lithium.
Claim 8
Dependent Claim
28 words
The method of claim 6 wherein the ether is selected from the group consisting of 1,2-dimethoxyethane (DME), 1,3-dimethoxy propane, diglyme, triglyme, tetraglyme, methyltetrahydrofurfuryl ether, 1,4-dioxane, and methoxy methyltetrahydrofuran.
Claim 9
Dependent Claim
16 words
The method of claim 4 wherein the lithium base comprises LiH and the ether comprises 1,2-dimethoxyethane.
Claim 10
Dependent Claim
27 words
The method of claim 8 further comprising dissolving the LiPF 6 -ether complex in 1,2-dimethoxy ethane; recrystallizing the complex; and again isolating the LiPF 6 -ether complex.
Claim 11
Dependent Claim
46 words
The method of claim 9 further comprising dissolving the complex in a mixture of propylene carbonate and dioxolane of between 2:1 and 1:4 parts by volume in an amount sufficient to give an electrolyte having a LiPF 6 concentration of between about 0.5 and 1 molar.
Claim 12
Dependent Claim
46 words
The method of claim 9 further comprising dissolving the complex in a mixture of propylene carbonate and 2-tetrahydrofuran of between 2:1 and 1:4 parts by volume in an amount sufficient to give an electrolyte having a LiPF 6 concentration of between about 0.5 and 1 molar.
Claim 13
Dependent Claim
46 words
The method of claim 9 further comprising dissolving the complex in a mixture of propylene carbonate and 4-methyldioxolane of between 2:1 and 1:4 parts by volume in an amount sufficient to give an electrolyte having a LiPF 6 concentration of between about 0.5 and 1 molar.
Claim 14
Independent Claim
52 words
A method for preparing an improved electrolyte containing LiPF 6 for use in an electrochemical cell comprising dissolving NH 4 PF 6 in a solvent comprising 1,2-dimethoxyethane; adding lithium hydride thereto whereby LiPF 6 and a complex of LiPF 6 and 1,2-dimethoxyethane are formed simultaneously; and isolating the LiPF 6 -1,2-dimethoxyethane complex.
Claim 15
Independent Claim
52 words
A method for preparing an improved electrolyte containing LiPF 6 for use in an electrochemical cell comprising dissolving NH 4 PF 6 in a solvent comprising 1,2-dimethoxyethane; adding lithium hydride thereto whereby LiPF 6 and a complex of LiPF 6 and 1,2-dimethoxyethane are formed simultaneously; and isolating the LiPF 6 -1,2-dimethoxyethane complex.
Claim 16
Dependent Claim
17 words
The method of claim 13 further comprising dissolving; recrystallizing; and isolating again the LiPF 6 -1,2-dimethoxyethane complex.
Claim 17
Dependent Claim
31 words
The method of claim 13 and further comprising dissolving the complex in an electrolyte solvent in an amount sufficient to give an electrolyte having a LiPF 6 concentration of 1 molar.
Claim 18
Dependent Claim
56 words
The method of claim 15 wherein said electrolyte solvent is selected from the group consisting of a mixture of propylene carbonate and dioxolane of about equal parts by volume, a mixture of propylene carbonate and 2-tetrahydrofuran of about equal parts by volume, and a mixture of propylene carbonate and 4-methyldioxolane of about equal parts by volume.
Claim 19
Dependent Claim
8 words
An electrolyte made in accordance with claim 12.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |