A lithium⁃rich cathode material, Li[ Li0.2 Ni0.13 Co0.13 Mn0.54 ] O2 , was synthesized from transition metal sulfate and LiOH·H2 O by the method of co⁃precipitation and high⁃temperature solid⁃phase sintering. The product structure and performance were analyzed by X⁃ray diffractometry ( XRD) , scanning electron microscopy ( SEM) and electrochemical testing. It is found that the precursor synthesized in water bath at 50℃ and pH of 11 exhibited good dispersivity as well as excellent electrochemical performance when it was sintered at 950 ℃. The initial discharge capacity and charge⁃discharge efficiency were 258.9 mAh/g(2.0~4.8 V) and 75.6% at 0.1C (1C=300 mA/g), respectively. The initial discharge capacity and the discharge capacity after 10 cycles at 1C were 204.6 mAh/g and 179.9 mAh/g, respectively. The discharge capacity at 2C still maintained 141.4 mAh/g.%以过渡金属硫酸盐和一水合氢氧化锂为原料,采用共沉淀⁃高温固相烧结法制备富锂正极材料Li[ Li0.2 Ni0.13 Co0.13 Mn0.54] O2。通过XRD、SEM和电池充放电测试方法考察了产物结构和性能,结果表明:在水浴50℃下控制pH=11合成的前驱体具有很好的分散性,且在950℃下烧结得到了优越的电化学性能;在0.1C(1C=300 mA/g)充放电时,首次放电比容量为258.9 mAh/g(2.0~4.8 V),首次充放电效率为75.6%;在1C充放电时,首次放电比容量为204.6 mAh/g,循环10次后放电比容量为179.9 mAh/g;2C倍率下仍保持了141.4 mAh/g的放电比容量。
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