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Title: Redox shuttles for overcharge protection of lithium batteries

Patent ·
OSTI ID:1011384
 [1];  [1];  [2]
  1. Downers Grove, IL
  2. San Jose, CA
+ Show Author Affiliations

The present invention is generally related to electrolytes containing novel redox shuttles for overcharge protection of lithium-ion batteries. The redox shuttles are capable of thousands hours of overcharge tolerance and have a redox potential at about 3-5.5 V vs. Li and particularly about 4.4-4.8 V vs. Li. Accordingly, in one aspect the invention provides electrolytes comprising an alkali metal salt; a polar aprotic solvent; and a redox shuttle additive that is an aromatic compound having at least one aromatic ring with four or more electronegative substituents, two or more oxygen atoms bonded to the aromatic ring, and no hydrogen atoms bonded to the aromatic ring; and wherein the electrolyte solution is substantially non-aqueous. Further there are provided electrochemical devices employing the electrolyte and methods of making the electrolyte.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-31109-ENG-38
Assignee:
CHO
Patent Number(s):
7,851,092
Application Number:
11/366,891
OSTI ID:
1011384
Country of Publication:
United States
Language:
English

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Chemical Overcharge and Overdischarge Protection for Lithium-Ion Batteries journal January 2005
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Electronically conductive phospho-olivines as lithium storage electrodes journal September 2002
Storage and cycling performance of Cr-modified spinel at elevated temperatures journal October 2001
Rechargeable cathodes based on Li2CrxMn2−xO4 journal April 1995
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Optimized LiFePO[sub 4] for Lithium Battery Cathodes journal January 2001
Optimized Lithium Iron Phosphate for High-Rate Electrochemical Applications journal January 2004
Electroactivity of natural and synthetic triphylite journal July 2001
Failure Mechanism and Improvement of the Elevated Temperature Cycling of LiMn[sub 2]O[sub 4] Compounds Through the Use of the LiAl[sub x]Mn[sub 2−x]O[sub 4−z]F[sub z] Solid Solution journal January 2001

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