Electrochemical and structural characterization of titanium-substituted manganese oxides based on Na0.44MnO2
A series of titanium-substituted manganese oxides, Li{sub x}Ti{sub y}Mn{sub 1-y}O{sub 2} (y = 0.11, 0.22, 0.33, 0.44, and 0.55) with the Na{sub 0.44}MnO{sub 2} structure were prepared from Na{sub x}Ti{sub y}Mn{sub 1-y}O{sub 2} (x {approx} 0.44) precursors. The electrochemical characteristics of these compounds, which retain the unique double-tunnel structure during ion exchange, were examined in lithium/polymer electrolyte cells operating at 85 C. All of the substituted cathode materials intercalated lithium reversibly, with Li{sub x}Ti{sub 0.22}Mn{sub 0.78}O{sub 2} exhibiting the highest capacity in polymer cells, about 10-20% greater than that of unsubstituted Li{sub x}MnO{sub 2} made from Na{sub 0.44}MnO{sub 2}. In common with Li{sub x}MnO{sub 2}, the Ti-substituted materials exhibited good capacity retention over one hundred or more cycles, with some compositions exhibiting a fade rate of less than 0.03% per cycle.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE. Assistant Secretary for Energy Efficiency and Renewable Energy. Office of the FreedomCAR and Vehicle Technologies Program; Korea Science and Engineering Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 837244
- Report Number(s):
- LBNL-54668; R&D Project: 500301; TRN: US200505%%174
- Journal Information:
- Journal of Power Sources, Vol. 135, Issue 1-2; Other Information: Submitted to Journal of Power Sources: Volume 135, No.1-2; Journal Publication Date: 09/03/2004; PBD: 1 Mar 2004
- Country of Publication:
- United States
- Language:
- English
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