Electrochemical Performance of the LiNi1/3Co1/3Mn1/3O2 in Aqueous Electrolyte
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LiNi1/3Co1/3Mn1/3O2 with a well-ordered layered structure, which is confirmed by X-ray diffraction, was synthesized by the sol-gel method. The electrochemical performance of LiNi1/3Co1/3Mn1/3O2 was investigated in a 2 M LiNO3 aqueous solution and in an organic solution. LiNi1/3Co1/3Mn1/3O2 showed a much better rate capability in the aqueous solution than in the organic solution; both charge and discharge processes were finished in a few seconds. The cycle performance of the LiNi1/3Co1/3Mn1/3O2 electrode with different charge/discharge rates from 80 to 200C was tested, and it exhibited good cycle performance in the aqueous solution with only 9.1% capacity loss after 1000 cycles at 80C (charge and discharge processes both within 20 s). The diffusion coefficients of lithium ion in the bulk of LiNi1/3Co1/3Mn1/3O2 in the aqueous and organic solutions were calculated to be 1.39 X 10(-10) and 1.51 X 10(-10) cm(2)/s, respectively, by slow scan cyclic voltammetry. The electrochemistry impedance spectrum indicates that R-ct in the aqueous solution is less than 1 Omega, which is 1-2 magnitude lower than in the organic solution. The fast and stable interfacial charge transfer in the aqueous solution should lead to improved electrochemical performance. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3374663] All rights reserved.