Synthesis And Electrochemical Property Of Spinel LiNi_0.5Mn_1.5O₄

With the rapid development of electronic technology industry and electrical car, the lithium-ion battery with high power, high capacity, high stability, high safety, high energy density and low cost become easier to be subjected for battery manufacturing company. And ternary alloy electrode material becomes the research focus of lithium battery industry. Although the traditional three element alloy electrode has already been applied to electronics and small electric vehicles, it couldn’t satisfy the high requirement for rapidly development of high energy consuming equipment.LNMO is a typical ternary alloy with high voltage, stable space structure and abundant material sources, which is considered to be very promising. Yolk-shelled and chamfered octahedral morphology are considered to be stable for LNMO, which is helpful for improving the cyclic stability of LNMO. The article mainly focuses on the preparation of the special morphology LNMO. we successfully synthesized the LNMO with stable yolk-shelled and chamfered octahedral structure. At the same time, to improve the capacity of LNMO, we have explored the way to prepare LNMO nano particle. And we draw the following conclusions:（1） We have optimized the process parameters for synthesizing yolk-shelled Mn₂O₃ with a controllable sintering method at 580℃. As a anode material, it exhibit great cyclic stability. At 200 m A g-1, it remains 542.9 m Ah g-1 after 100 cycles.（2） We have found the procedure to synthesize yolk-shelled LNMO, which is synthesized by Li NO3 and yolk-shelled Mn₂O₃. As a cathode material, it exhibit great cyclic stability. At 1 C, it remains 98.3 m Ah g-1 with the capacity retention of 99.7% after 300 cycles.（3） We have optimized the process parameters for synthesizing chamfered octahedral LNMO, which is synthesized by Li OH and yolk-shelled structured Mn₂O₃. As a cathode material, it exhibits great cyclic stability. At 1 C, it remains 121.8 m Ah g-1 with the capacity retention of 94.7% after 300 cycles.（4） We have optimized the process parameters for synthesizing sub micro octahedral LNMO. Through ultrasonification and alkaline treatment, we successfully prepared sub micro octahedral LNMO with Li NO3 reactant, which is meaningful for the researchers on farther reducing the size of LNMO. With nano-sized Mn₂O₃ precursor and Li NO3 reactant, we have prepared nano particle LNMO.