Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第7期    总第148期    2011年7月

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文章编号:1004-0609(2011)07-1601-06
正极材料LiNi0.8Co0.1Mn0.1O2的合成及电化学性能
岳 鹏, 彭文杰, 王志兴, 李新海, 李灵均, 郭华军, 胡启阳, 张云河

(中南大学 冶金科学与工程学院,长沙 410083)

摘 要: 将液相共沉淀法制备的Ni0.8Co0.1Mn0.1(OH)2与LiOH·H2O混合,固相烧结合成微米级的LiNi0.8Co0.1Mn0.1O2 正极材料。XRD谱表明,合成的LiNi0.8Co0.1Mn0.1O2 正极材料为典型的α-NaFeO2层状结构,无杂质峰;从SEM像可以看出,产物颗粒为类球形,分散性好,由一次粒子紧密堆积而成,平均粒径为3 μm;电化学测试结果表明,在2.8~4.3 V电压范围内,750 ℃焙烧15 h合成的LiNi0.8Co0.1Mn0.1O2材料的电化学性能最优,0.1 C 时,其首次放电容量为186.748 mA·h/g,分别高于700和800 ℃时的首次放电容量172.947和180.235 mA·h/g。材料在0.5和2 C时循环40次后,容量保持率分别为98.32%和88.72%,循环性能良好。

 

关键字: LiNi0.8Co0.1Mn0.1O2;正极材料;共沉淀法;电化学性能

Synthesis and electrochemical performance of
micro-size LiNi0.8Co0.1Mn0.1O2 cathode material
YUE Peng, PENG Wen-jie, WANG Zhi-xing, LI Xin-hai, LI Ling-jun, GUO Hua-jun, HU Qi-yang, ZHANG Yun-he

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The micro-size LiNi0.8Co0.1Mn0.1O2 cathode material was synthesized by mixing Ni0.8Co0.1Mn0.1(OH)2 and LiOH·H2O via solid state reaction followed by heating to elevated temperatures. X-ray diffraction (XRD) patterns show that all samples exhibit typical α-NaFeO2 structure without any other impurities. The scanning electron microscopy (SEM) reveals that the primary particles agglomerate to form secondary particles with an average size of 3 μm, and the particles are near-spherical and well distributed. In the voltage range of 2.8−4.3 V, LiNi0.8Co0.1Mn0.1O2 synthesized at 750 ℃ for 15 h exhibits a higher initial discharge capacity of 186.748 mA·h/g at 0.1 C compared with those of LiNi0.8Co0.1Mn0.1O2 synthesized at 700 and 800 ℃ (172.947 and 180.235 mA·h/g, respectively). The material has excellent cycling performance, in which the capacity retention at the rates of 0.5 and 2 C are 98.32% and 88.72%, respectively, after 40 cycles.

 

Key words: LiNi0.8Co0.1Mn0.1O2; cathode material; co-precipitation; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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