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

a polymer electrolyte and high elastic modulus technology, applied in the field of polymer electrolyte, to achieve the effect of preventing thermal runaway and dropping conductivity

a polymer electrolyte and high elastic modulus technology, applied in the field of polymer electrolyte, to achieve the effect of preventing thermal runaway and dropping conductivity

US20090104523A1Inactive Publication Date: 2009-04-23RGT UNIV OF CALIFORNIA
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  • High elastic modulus polymer electrolytes suitable for preventing thermal runaway in lithium batteries
  • High elastic modulus polymer electrolytes suitable for preventing thermal runaway in lithium batteries
  • High elastic modulus polymer electrolytes suitable for preventing thermal runaway in lithium batteries

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[0092]The following examples provide details relating to composition, fabrication and performance characteristics of block copolymer electrolytes in accordance with the present invention. It should be understood the following is representative only, and that the invention is not limited by the detail set forth in these examples.

[0093]To characterize the electrolyte, experimental data results were obtained by methods such as transmission electron microscopy (TEM), small angle X-ray scattering (SAXS), AC impedance spectroscopy, and rheology. AC impedance spectroscopy measurements were made using a test cell on thermo-stated pressed samples in the glove box, and a Solartron 1260 Frequency Response Analyzer machine connected to a Solartron 1296 Dielectric Interface. The polymer samples for TEM and SAXS were annealed using the same thermal history as that used for conductivity measurements. The electrolyte samples were kept at 120° C. for 2 hrs, and cooled to room temperature. Thin secti...

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Abstract

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 1×107 Pa and an ionic conductivity of at least 1×10−5 Scm−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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of the international application PCT / US2007 / 008435 filed on Apr. 3, 2007, titled HIGH ELASTIC MODULUS POLYMER ELECTROLYTES; which claims priority to U.S. Provisional Patent Application No. 60 / 744,243 filed Apr. 4, 2006, titled HIGH ELASTIC MODULUS POLYMER ELECTROLYTES; and to U.S. Provisional Patent Application No. 60 / 820,331 filed Jul. 25, 2006, titled SYNTHESIS OF DRY POLYMER ELECTROLYTES. The disclosures of applications listed above are incorporated herein by reference in their entirety and for all purposes.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.FIELD OF THE INVENTION[0003]The invention rel...

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Application Information

Patent Timeline
23 Apr 2009
Publication
US20090104523A1
IPC
H01M6/18; C08L53/00; H02J7/00
CPC
C08F297/02; C08L53/00; H01B1/122; H01M10/052; H01M10/0565; H01M10/443; Y02E60/122; H01M2300/0082
Inventors
MULLIN, SCOTT; PANDAY, ASHOUTOSH