In order to solve the problem of low capacity and high price of the lithium cobalt oxide material, the. Lithium rich materials with solid solution structure, specific capacity can reach 300mAh/g, and because of the wide use of the Mn element with low price, greatly reducing the cost of lithium rich materials, is a very promising new generation of cathode materials for lithium ion batteries.
But the Li rich material also has its own inherent problems, such as poor rate performance, poor cycle performance and voltage drop decline, only to solve these problems, in order to make the electric car manufacturers to accept and power battery using lithium rich materials.
In order to solve the above problems, the Beijing Jiaotong University Linjing Zhang et al. Developed a two step hydrothermal method to synthesize the high rate performance of nano lithium rich materials, the material has good cycling performance and rate, 1C rate than the capacity of up to 238.7mAh/g, 10C, the specific capacity still can reach 182.7mAh/g.
Zhang Linjing using two steps hydrothermal synthesis of Li[Li0.2Ni0.2Mn0.6]O2 material, the method mainly contains two steps, the first step to the use of glucose in the hydrothermal synthesis of carbon microspheres 180 degrees Celsius, as the second template. In the synthesis process of second step hydrothermal method, using Ni and Mn acetate as raw material, in the synthesis of lithium rich materials under 450 DEG C, morphology and structure of lithium rich materials for improving the Li[Li0.2Ni0.2Mn0.6]O2 carbon microspheres through the first step of the process of adding different quantity in the synthesis, the added carbon microsphere template will decompose in the subsequent sintering process, so as not to residual carbon materials.
The study found that when the adding amount of carbon microspheres is too little, it will cause the nanoparticles of lithium rich materials to agglomerate, and carbon microspheres will result in excessive material particles are too loose lithium rich materials adding 10wt% carbon microspheres has the best cycling performance and rate performance and the low voltage decline.
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