The effect of tetravalent titanium substitution in LiNi{sub 1-x}Ti{sub x}O{sub 2) (0.025 {le}x{le}0.2) system.
Layered LiNi{sub 1-x}Ti{sub x}O{sub 2} (0.025 {<=} x {<=} 0.2) containing tetravalent titanium ions was prepared by solid-state reaction at 750{sup o}C under an oxygen stream. The products show highly ordered and phase-pure layered compounds. The structural integrity of the materials could be preserved by substituting Ti{sup 4+} ions to prevent impurity Ni{sup 2+} migration into lithium sites. The LiNi{sub 1-x}Ti{sub x}O{sub 2} (0.025 {<=} x {<=} 0.2) cathode exhibits high reversible capacities (up to 240 mA h/g) and excellent cyclability (over 100 cycles) in the range 4.3-2.8 V at a current density of 0.2 mA/cm{sup 2} (C/5 rate). One composition, LiNi{sub 0.975}Ti{sub 0.025}O{sub 2}, showed the highest reversible capacity and energy density of all known layered LiNiO{sub 2} or LiCoO{sub 2} materials. The novel concept of substitution of tetravalent titanium is proven to be promising.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 943219
- Report Number(s):
- ANL/CMT/JA-38392; TRN: US0903029
- Journal Information:
- J. Eletrochem. Commun., Vol. 3, Issue 2 ; Feb. 2001; ISSN 1388-2481
- Country of Publication:
- United States
- Language:
- ENGLISH
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