Electrochemical properties of carbon-coated Li[Ni1/3Co1/3Mn1/3]O2 cathode material for lithium-ion batteries

The carbon-coated Li[Ni1/3Co1/3Mn1/3]O-2 Was synthesized from the porous Li[Ni1/3Co1/3Mn1/3]O-2 precursor using citric acid as the carbon source. The electrochemical results showed that both cycling performance and rate capability were improved by the carbon-coating of the Li[Ni1/3Co1/3Mn1/3] O-2 materials. It is proposed that the enhanced electrochemical properties by the carbon-coating are attributed to the increased electronic conductivity, because the carbon distributed among the surfaces of spherical Li[Ni1/3Co1/3Mn1/3]O-2 powders favored the transference of electron and reduced cell polarization. (C) 2007 Elsevier B.V. All rights reserved.