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Title: Lithium Metal-Copper Vanadium Oxide Battery with a Block Copolymer Electrolyte

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.1331610jes· OSTI ID:1347282
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [6];  [7]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Energy Storage Research (JCESR) and Energy Technologies Area; Univ. of California, Berkeley, CA (United States). Department of Chemical and Biomolecular Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department; Stony Brook Univ., NY (United States). Dept. of Chemistry
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Energy Storage Research (JCESR); Univ. of California, Berkeley, CA (United States). Department of Chemical and Biomolecular Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Univ. of Chicago, IL (United States). Department of Chemistry
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Energy Storage Research (JCESR), Energy Technologies Area and Materials Science Division; Univ. of California, Berkeley, CA (United States). Department of Chemical and Biomolecular Engineering

Lithium (Li) batteries comprising multivalent positive active materials such as copper vanadium oxide have high theoretical capacity. These batteries with a conventional liquid electrolyte exhibit limited cycle life because of copper dissolution into the electrolyte. We report here on the characterization of solid-state Li metal batteries with a positive electrode based on α-Cu6.9V6O18.9(α-CuVO3). We replaced the liquid electrolyte by a nanostructured solid block copolymer electrolyte comprising of a mixture of polystyrene-b-poly(ethylene oxide) (SEO) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) salt. In situ X-ray diffraction was used to follow the Li insertion/de-insertion mechanism into the α-CuVO3host material and its reversibility. In situ X-ray scattering revealed that the multistep electrochemical reactions involved are similar in the presence of liquid or solid electrolyte. The capacity fade of the solid-state batteries is less rapid than that of α-CuVO3-Li metal batteries with a conventional liquid electrolyte. Hard X-ray microtomography revealed that upon cycling, voids and Cu-rich agglomerates were formed at the interface between the Li metal and the SEO electrolyte. The void volume and the volume occupied by the Cu-rich agglomerates were independent of C-rate and cycle number.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; AC02-05CH11231
OSTI ID:
1347282
Alternate ID(s):
OSTI ID: 1456927
Report Number(s):
BNL-112701-2016-JA
Journal Information:
Journal of the Electrochemical Society, Vol. 163, Issue 10; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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