Electrochemical performance of SnPO<inf>4</inf>-coated LiNi<inf>1/3</inf>Mn<inf>1/3</inf>Co<inf>1/3</inf>O<inf>2</inf>cathode materials

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Journal Article
Journal of New Materials for Electrochemical Systems, 2009, 12 (4), pp. 207 - 212
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A Sn phosphate was successfully coated to the surface of LiNi1/3Co1/3Mn1/3O2particles using a new method we developed. The elements Sn and P were observed to be uniformly distributed on the surface of the LiNi1/3Co1/3Mn1/3O2After the Sn phosphate coating, the onset temperature shifted up to about 250 °C, and the exothermic value also decreased to 116.3 J/g, i.e. the thermal stability of the material was enhanced. The rate capability of the 1 wt% Sn phosphate-coated LiNi1/3Co1/3Mn1/3O2materials was enhanced at room temperature and 60 °C. However, a 3 wt% Sn phosphate coating degraded the electrochemical performance. The 1 wt% Sn phosphate-coated material showed improved cycle performance compared to that of the bare material at room temperature and 60 °C. It is believed that the oxide coating layer prevented direct contact with the organic electrolyte. © J. New Mat. Electrochem. Systems.
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