Impact of Synthesis Method on Phase Transformations of Layered Lithium Vanadium Oxide upon Electrochemical (De)lithiation
- Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
- Stony Brook Univ., NY (United States). Dept. of Chemistry
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- Brookhaven National Lab. (BNL), Upton, NY (United States). Energy and Photon Sciences Directorate
- Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering. Dept. of Chemistry
- Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering. Dept. of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States). Energy and Photon Sciences Directorate
Li1.1V3O8 (LVO) has shown promise as a cathode material for lithium-based batteries due to its high theoretical capacity (360 mAh.g-1) and good rate capability; however, LVO batteries suffer from capacity fade upon extended cycling. The impact of synthetic material control on electrochemistry and capacity retention was explored here through solvothermal synthesis of LVO fibers and sol-gel synthesis of LVO rhombohedrons. Cyclic voltammetry (CV) of the two materials revealed key differences where lithiation of the solvothermal-derived LVO material resulted in less β phase formation as compared with the sol-gel-derived material. Structural evolution of the materials during lithiation was characterized through in situ XRD which revealed that the α→β phase conversion is essentially complete in the sol-gel product with only partial conversion in the solvothermal product. Under galvanostatic cycling, the sol-gel product delivered higher capacity but displayed more capacity fade as compared to the solvothermal product as foretold by both CV and XRD findings. When cycled within the α phase region, improved preservation of both energy delivery and structural integrity was observed. These findings substantiate the proposed cause of capacity degradation as originating from an α→β structural change and illustrate the possibility of minimizing β phase formation through synthetic control of LVO.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2mt); Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; SC0012673
- OSTI ID:
- 1503509
- Report Number(s):
- BNL-211465-2019-JAAM
- Journal Information:
- Journal of the Electrochemical Society, Vol. 166, Issue 4; ISSN 0013-4651
- Publisher:
- The Electrochemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
CTAB-assisted sol-gel synthesis of Li{sub 4}Ti{sub 5}O{sub 12} and its performance as anode material for Li-ion batteries
Co-sputtering of lithium vanadium oxide thin films with variable lithium content to enable advanced solid-state batteries