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High elastic modulus polymer electrolytes suitable for preventing thermal runaway in lithium batteries

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
A polymer that combines high ionic conductivity with the structural properties required for Li electrode stability is useful as a solid phase electrolyte for high energy density, high cycle life batteries that do not suffer from failures due to side reactions and dendrite growth on the Li electrodes, and other potential applications. The polymer electrolyte includes a linear block copolymer having a conductive linear polymer block with a molecular weight of at least 5000 Daltons, a structural linear polymer block with an elastic modulus in excess of 1.times.10.sup.7 Pa and an ionic conductivity of at least 1.times.10.sup.-5 Scm.sup.-1. The electrolyte is made under dry conditions to achieve the noted characteristics. In another aspect, the electrolyte exhibits a conductivity drop when the temperature of electrolyte increases over a threshold temperature, thereby providing a shutoff mechanism for preventing thermal runaway in lithium battery cells.
Mullin, Scott (Berkeley, CA), Panday, Ashoutosh (Berkeley, CA), Balsara, Nitash Pervez (El Cerrito, CA), Singh, Mohit (Berkeley, CA), Eitouni, Hany Basam (Berkeley, CA), Gomez, Enrique Daniel (Princeton, NJ)
The Regents of the University of California
12/ 286,898
October 1, 2008
STATEMENT OF GOVERNMENTAL SUPPORT [0002] This invention was made with government support under Contract DE-AC02-05CH11231 awarded by the United States Department of Energy to The Regents of the University of California for the management and operation of the Lawrence Berkeley National Laboratory. The government has certain rights in this invention.