银包覆表面修饰提高LiFePO4的电化学性能

LiFePO4是一种用于锂离子二次电池的潜在正极材料．LiFePO4微粒通过简单的共沉淀方法合成，为了增加其电子导电率，在水中用硝酸银溶液对LiFePO4进行包覆．粒子表面高分散的银提高了电子导电率和容量．不同电流密度下银包覆LiFePO4的电化学性能和其他高导电率的LiFePO4是相似的．银包覆是一种保持容量的有效方法，甚至在高的电流密度下也是如此．

Surface Modification by Silver Coating for Improving Electrochemical Properties of LiFePO4

LiFePO4 is a potential candidate for the cathode material of the lithium secondary battery. Fine particle LiFePO4 was synthesized by the simple co - precipitation method, and aqueous coating on the LiFePO4 was tried using silver nitrate solution in order to increase electronic conductivity. Highly dispersed silver on the particles enhances the electronic conductivity and increases the capacity. The electrochemical properties of the silver coated LiFePO4 with the various current densities are analogous to those of highly conductive LiFePO4. The silver coating can be a promising tool to preserve the capacity even at the high current densities, q 2003 Elsevier Ltd. All rights reserved.