摘要：

Spinel Li_1+xMn_2-xO₄ has been studied extensively as a promising cathode material for lithium rechargeable batteries with high energy density due to the following advantages. (1) it is less expensive; (2) it is less toxic; (3) it is easier to prepare than layered LiCoO₂ and LiNiO₂. The preparation methods have important and remarkable effects on the electrochemical properties of spinel Li_1+xMn_2-xO₄ cathode material. Li1+,Mn2_x04 powders are typically synthesized by solid state reaction which consists of extensively mechanical mixing and intermitted grinding^[1,2]. This treatment is detrimental to the quality of the final product because of the resulting inhomogeneity, irregular morphology, larger particle size with broader particle diameter distribution, and poor control of stoichiometry resulted from lithium loss at high temperature for long time. In order to achieve good efficiency of lithium utilization at high current and high reliability of lithium rechargeable batteries, we developed a new synthesis process which was called as in-situ redox precipitation method^[3]. By this method, the Li_1+xMn_2-xO₄ cathode material with good homogeneity, uniform morphology and narrow particle-size distribution as well as excellent electrochemical performance can be easily produced at lower temperature and in a shorter processing time. In this paper, our partial findings were reported.

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