无机化学学报

纳米尖晶石Li_xMn₂O₄的制备与电化学性能表征

Preparation of Nano-spinel Li_xMn₂O₄ and Characterization of its Electrochemical Properties

作者	单位
卫敏	北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京 100029
张杰	北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京 100029
杨文胜	北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京 100029
张密林	北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京 100029
段雪	北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京 100029

摘要:

关键词: 纳米尖晶石Li_xMn₂O₄ 材料制备电化学性能

基金项目:

Abstract: Nano-spinel Li_xMn₂O₄(0.6 ≤x≤ 1.0) was synthesized by two steps of coprecipitation and calcination. The influences of calcination temperature, time and Li/Mn ratio on the crystal structure and the particle size of Li_xMn₂O₄ were investigated. It was shown that the higher the calcination temperature, the more complete the crystal structure, and the larger the particle size. Moreover, the influence of calcination time on the crystal structure was insignificant when it was more than 3h at 700℃. With the increase of x in Li_xMn₂O₄ in the range of 0.6～1.0, the d111 and lattice parameter a increased first and then decreased. The electrochemical properties of nano-spinel LiMn₂O₄ using as cathode material of lithium-ion battery were studied. The low discharge capacity might be due to the irreversible capacity loss brought by the large surface area and lattice vacancies of the nano-spinel.

Keywords: nano-spinel Li_xMn₂O₄ preparation electrochemical properties

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卫敏,张杰,杨文胜,张密林,段雪.纳米尖晶石Li_xMn₂O₄的制备与电化学性能表征[J].无机化学学报,2002,18(7):713-717.

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