【摘要】 用固相法与熔融盐法相结合的新工艺,制备了锂离子电池正极材料Li Ni O2。在空气中,对Li NO3+Li OH的熔融盐混合物和Ni(OH)2的混合粉体进行了差热热重分析,研究了时间、生长后热处理等因素对产物结构的影响。X射线衍射分析表明制得的Li Ni O2具有αNaFeO2结构且晶型完整。电性能测试表明在0.5mA/cm2的充放电电流密度和2.7~4.2V的电压范围内,放电比容量可达150.2(mA·h)/g,Coulomb效率达82.9%,循环20次后,放电比容量仍达126.6(mA·h)/g。结果表明采用此工艺,能制备出电化学性能良好的Li Ni O2正极材料。更多还原

【Abstract】 Cathode material LiNiO₂ for lithium ion batteries was prepared by a novel technique of a solid state reaction combined with the melting salt method. The mixed powders of LiNO₃+LiOH and Ni（OH）₂ melting salt were analyzed in air by thermogravimetricdifferential thermal analysis. The effects of the preparation conditions such as reaction time, heat treatment, etc. on the structure of products were studied. X-ray diffraction results show that the prepared LiNiO₂ under the optimum conditions has a perfect structure of αNaFeO₂. Electrochemical performance tests show that when the chargedischarge current density is 0.5mA/cm2 and the chargedischarge voltage is 2.7—4.2V, the initial discharge specific capacity of the LiNiO₂ reaches 150.2 （mA·h）/g. The efficiency of coulomb is 82.9%. The discharge specific capacity remains 126.6 （mA·h）/g after 20 cycles. The results indicate that this technique can be used to prepare cathode material LiNiO₂ with good electrochemical properties.更多还原