Lithium Metal-Copper Vanadium Oxide Battery with a Block Copolymer Electrolyte
- 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
- Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department; Stony Brook Univ., NY (United States). Dept. of Chemistry
- 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
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Chicago, IL (United States). Department of Chemistry
- Brookhaven National Lab. (BNL), Upton, NY (United States). Sustainable Energy Technologies Department
- 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
Web of Science
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