ＬｉＮｉ０．８Ｃｏ０．２Ｏ２是很有希望取代ＬｉＣｏＯ２的新一代锤离子电池正极材料．采用控制结晶法合成球形 α－Ｎｉ０．8
Ｃｏ０．２（ＯＨ）２为前驱体，与 ＬｉＯＨ·Ｈ２Ｏ混合，在７００℃通Ｏ２热处理４ｈ合成锂离子电池正极材料ＬｉＮｉ０．８Ｃｏ０.２Ｏ２粉末．Ｘ光衍射分析表明合成的ＬｉＮｉ０．８Ｃｏ０．２Ｏ２粉末结晶良好，具有规整的α－ＮａＦｅＯ２层状结构．扫描电镜分析表明粉末颗粒呈球形，粒径约８μｍ．粉末的流动性好，堆积密度高．充放电测试表明，合成的 ＬｉＮｉ０．８Ｃｏ０．２Ｏ２正极材料具有优良的电化学性能：首次充电比容量为１９７ｍＡｈ·ｇ－１，放电比容量为１７４ｍＡｈ·ｇ－１，１０次充放电循环后保持初始放电比容量的９６．６％．
LiNi0.8Co0.2O2 cathode material is a very promising candidate to replace LiCoO2 for lithium secondary batteries.
Spherical α-Ni0.8Co0.2(OH)2 powders were prepared via a “controlled crystallization” method. The LiNi0.8Co0.2O2 powders
were synthesized by sintering the α-Ni0.8Co0.2(OH)2 precursor and LiOH·H2O in oxygen at 700℃ for 4h. XRD results show the powders
are highly crystallized LiNi0.8Co0.2O2 with order α-NaFeO_2 layer structure. SEM photographs show the powders are spherical dispersed particulate with
the particle size of approximately 8μm. The powders have good fluidity and high tap-density. Electrochemical test proves the LiNi0.8Co0.2O2 cathode material has excellent
electrochemical performance. The material shows a high initial charge capacity of 197mAh·g-1 and discharge capacity of 174mAh·g-1, and retention of more than 96.6% after 10 cycles.
参考文献
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