【作者】 胡国荣； 刘强； 杜柯； 彭忠东； 刘万民；

【Author】 Hu Guo-rong,Liu Qiang,Du ke,Peng Zhong-dong,Liu Wangmin (School of Metallurgical Science and Engineering of Central South University,Changsha410083,china)

【机构】 中南大学冶金科学与工程学院；

【摘要】 镍基锂离子正极材料LiNi_1-xMxO₂（M=Co、Mn、Al、Mg等）具有容量更高、价格更低、毒性较弱等优点,是一种可能取代商业钴酸锂的替代材料。减少高价金属Co对Ni的取代量,进一步开发具有更高容量和更低价格的镍基材料成为研究的热点。本文设计并采用共沉淀法合成了LiNi_0.9Co_0.05Mn_0.025Mg_0.025O₂,以Ni、Co、MnMg计量比为9:0.5:0.25:0.25的金属硫酸盐混合溶液、氢氧化钠和氨水为原料,在恒温搅拌反应器内共沉淀得到了单一相前躯体。将前躯体与LiOH·H₂O混合压制成型后在流通氧气中进行烧结（750～850℃）得到正极材料,XRD分析表明材料具六角晶格层状结构,Li/LiNi_0.9Co_0.05Mn_0.025Mg_0.025O₂电池在2.8～4.3V电压范围内首次放电容量为200mAh/g,在0.2C的电流密度下循环20次容量保持率为90.2%。更多还原

【Abstract】 Nickel-based cathode LiNi_1-xM_xO₂ is a promising candidate to substitute commercialized LiCoO₂ for its higher capacity,lower price and less toxicity.In this paper,LiNi_0.9Co_0.05Mn_0.025Mg_0.025O₂ was designed and synthesized with metal hydroxide precursors that were prepared by a co-precipitation method.XRD analysis indicates that single phase and layered structure LiNi_0.9Co_0.05Mn_0.025Mg_0.025O₂ was obtained.The initial discharge capacity of the cathode material is determined to be 200mAh/g using Li/ LiNi_0.9Co_0.05Mn_0.025Mg_0.025O₂ cell operated at 0.1C in the voltage range of 2.8～4.3V. The discharge capacity retention at 20th cycle at 0.2C is more than 90.2%.更多还原