氧化铟包覆镍锰酸锂正极材料的电化学性能研究

Electrochemical Properties of Indium Oxide Coated LiNi_(0.5)Mn_(1.5)O_(4)Anode Material

为改善镍锰酸锂的电化学性能,以硝酸铟(In(NO_(3))_(3)·H_(2)O)为原料,通过高温固相法在镍锰酸锂电极材料表面包覆一层惰性氧化铟(In_(2)O_(3)),并研究不同In_(2)O_(3)包覆量对镍锰酸锂复合材料的电化学性能的影响。XRD测试结果显示,包覆氧化铟并不会改变正极材料LiNi_(0.5)Mn_(1.5)O_(4)自身结构。当包覆量为7%时,在0.1 mA的测试电流下首次放电比容量为134.21 mAh/g,明显高于未涂覆材料(115.65 mAh/g),100次循环后容量为128.4 mAh/g,容量保持率为95.67%;在0.5 mA的测试电流条件下,首次放电比容量为78.13 mAh/g,100次循环后比容量为56.25 mAh/g,容量保持率为64.44%。In_(2)O_(3)包覆起到保护材料和促进离子传导的作用,可有效提高正极材料的电化学性能。

In order to improve the electrochemical performance of LiNi_(0.5)Mn_(1.5)O_(4),a layer of inert indium oxide(In_(2)O_(3))was coated on the surface of lithium nickel-manganate electrode material by high temperature solid phase method using indium nitrate(In(NO_(3))_(3)·H_(2)O)as raw material,and the effect of different amount of In_(2)O_(3)coating on the electrochemical performance of lithium nickel-manganate composite material was studied.XRD test results show that coating indium oxide does not change the structure of anode material LiNi_(0.5)Mn_(1.5)O_(4).When the coating volume is 7%,the first discharge specific capacity is 134.21 mAh/g at 0.1 mA test current,which is significantly higher than that of the uncoated material(115.65 mAh/g).After 100 cycles,the capacity is 128.4 mAh/g,and the capacity retention rate is 95.67%.Under the test current condition of 0.5 mA,the first discharge specific capacity is 78.13 mAh/g,after 100 cycles the specific capacity is 56.25 mAh/g,the capacity retention rate is 64.44%.In_(2)O_(3)coating can protect the material and promote ion conduction,which can effectively improve the electrochemical performance of cathode materials.