Electrochemical lithium intercalation in VO{sub 2}(B) in aqueous electrolytes

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837099· OSTI ID:404627

Zhang, M; Dahn, J R ^[1]

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1. Simon Fraser Univ., Burnaby, British Columbia (Canada). Dept. of Physics

Electrochemical lithium intercalation in VO{sub 2}(B) electrodes in aqueous electrolytes has been studied by means of electrochemical methods (such as cyclic voltammetry and constant current discharge and charge) as well as atomic absorption spectrophotometry. Experiments were conducted in various buffer electrolytes having a range of pH from 6.0 to 11.3. Voltammetry clearly reveals current peaks related to lithium intercalation and deintercalation in the whole pH range investigated. Electrolyte pH plays a very important role in the performance of VO{sub 2}(B) electrodes. When pH is higher than about 10, the capacity involved in the lithium intercalation in VO{sub 2}(B) electrodes shows a rapid decline with repetitive cycling, which is suggested to be the result of the dissolution of the VO{sub 2}(B) electrodes into the bulk electrolytes. Decreasing the pH tends to reduce the dissolution of VO{sub 2}(B) and thereby gives better cycling behavior of VO{sub 2}(B) electrodes. On the other hand, it also leads to increased hydrogen evolution that might affect the lithium intercalation reaction. Thus, the optimum pH range for the lithium intercalation reaction is found to be between 8 and 10. VO{sub 2}(B) electrodes cycled in this pH range demonstrate very good capacity retention.

• Sponsoring Organization: USDOE
• OSTI ID: 404627
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 143; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
BATTERY CHARGING
ELECTRODES
IMPREGNATION
LITHIUM
METAL-NONMETAL BATTERIES
PARAMETRIC ANALYSIS
PH VALUE
SERVICE LIFE
VANADIUM OXIDES
VOLTAGE DROP