高容量富锂正极材料Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2)合成及表征

Synthesis and Characterization of High-capacity Lithium-rich Cathode Materials Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2)

以共沉淀法合成的Ni_(0.17)Co_(0.11)Mn_(0.59)(OH)_(2)为前驱体,LiOH·H_(2)O为锂源,通过高温固相反应法制备富锂正极材料Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2)。采用XRD、SEM和充放电测试装置研究不同烧结温度(750℃、800℃、850℃、900℃)制备的富锂正极材料的结构、形貌和电性能。结果表明:在烧结温度为800℃、保温12 h的条件下合成的富锂正极材料Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2)具有良好的晶体结构、微观形貌和电化学性能;0.1 C倍率下的首次放电比容量为267.4 mAh/g,首次库伦效率为83.87%;1C倍率下首次放电比容量为196.7 mAh/g,充放电循环50圈的容量保持率为94.15%。

In this paper,the Ni_(0.17)Co_(0.11)Mn_(0.59)(OH)_(2) precursor was synthesized by the co-precipitation method,LiOH·H_(2)O was used as the lithium source,and the Lithium-rich Cathode Material Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2) was synthesized by high temperature solid-state method.Using X-ray diffraction(XRD),scanning electron microscope(SEM),galvanostatic charge/discharge battery test system to study the structure,morphology and electrical properties of lithium-rich cathode materials prepared at different sintering temperatures(750℃,800℃,850℃,900℃).As a result,Li_(1.13)Ni_(0.17)Co_(0.11)Mn_(0.59)O_(2) was sintered at 800℃for 12 h,which has a good crystal structure,micro morphology and best electrochemical performance.The cathode displays a high discharge capacity of 267.4 mAh/g with initial coulombic efficiency of 83.87%at 0.1 C,the initial discharge capacity was 196.7 mAh/g and a good capacity retention of 94.15%after 50 cycles at 1 C.