Li1.2Ni0.2Co0.08Mn0.52O2(LLMO)precursor with uniform secondary spherical particles is prepared via co-precipitation method.Subsequently,LLMO precursor,solid lithium lanthanum zirconate(LLZO)electrolyte,and lithium hydroxide are mixed uniformly together and then calcined to synthesize LLMO cathode materials with different LLZO coating amounts(LLZO@LLMO).The microstructure of LLMO precursor is studied by using X-ray diffraction(XRD),scanning electron microscopy(SEM),and other testing methods.Results indicate that the optimal electrochemical performance of LLZO@LLMO is achieved with 1wt.％of LLZO coating amount.Under a 0.1 C rate,its initial discharge capacity reaches 253.1 mAh·g-1,with an initial Coulombic efficiency of 81.1％.After 100 cycles at 1 C rate,the discharge capacity is 162.3 mAh·g-1,with a capacity retention rate of 89.0％.Even under a rate as high as 5 C,the discharge capacity remains at 120.4 mAh·g-1.The modified samples exhibit significantly improved cycling and rate performance compared to the original samples.
关键词
锂离子电池/富锂锰基正极材料/包覆/共沉淀法/固态电解质
Key words
lithium ion battery/lithium rich manganese-based cathode material/coated/coprecipitation method/solid electrolyte
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