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Electrochemical storage cell containing a substituted anisole or di-anisole redox shuttle additive for overcharge protection and suitable for use in liquid organic and solid polymer electrolytes

Patent ·
OSTI ID:872937
 [1];  [2]
  1. Oakland, CA
  2. Kobe, JP
+ Show Author Affiliations

A electrochemical cell is described comprising an anode, a cathode, a solid polymer electrolyte, and a redox shuttle additive to protect the cell against overcharging and a redox shuttle additive to protect the cell against overcharging selected from the group consisting of: (a) a substituted anisole having the general formula (in an uncharged state): ##STR1## where R.sub.1 is selected from the group consisting of H, OCH.sub.3, OCH.sub.2 CH.sub.3, and OCH.sub.2 phenyl, and R.sub.2 is selected from the group consisting of OCH.sub.3, OCH.sub.2 CH.sub.3, OCH.sub.2 phenyl, and O.sup.- Li.sup.+ ; and (b) a di-anisole compound having the general formula (in an uncharged state): ##STR2## where R is selected from the group consisting of -OCH.sub.3 and -CH.sub.3, m is either 1 or 0, n is either 1 or 0, and X is selected from the group consisting of -OCH.sub.3 (methoxy) or its lithium salt --O.sup.- Li.sup.+. The lithium salt of the di-anisole is the preferred form of the redox shuttle additive because the shuttle anion will then initially have a single negative charge, it loses two electrons when it is oxidized at the cathode, and then moves toward the anode as a single positively charged species where it is then reduced to a single negatively charged species by gaining back two electrons.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
DOE Contract Number:
AC03-76SF00098
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 6045952
OSTI ID:
872937
Country of Publication:
United States
Language:
English

References (5)

Overcharge Protection for Rechargeable Lithium Polymer Electrolyte Batteries journal January 1996
Ether Cleavage with Organo-Alkali-Metal Compounds and Alkali Metals journal October 1987
Electron-transfer-induced reductive demethoxylation of anisole: evidence for cleavage of a radical anion journal February 1992
Mechanistic study of anodic intramolecular coupling reactions journal November 1979
Redox chemistry of substituted benzenes: the one-electron reduction potentials of methoxy-substituted benzene radical cations journal October 1993

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