Synthesis and performance evaluation of LiFe0.06Ni0.94PO4/C high voltage cathode material
Lithium nickel phosphate(LiNiPO4)is an olivine-based lithium-ion battery cathode material with a high voltage platform of 5.1 V,but its practical application is limited by its lower conductivity and practical discharge specific capacity.In order to prepare pure-phase LiNiPO4,the influences of different molar ratios of oleylamine surfactant on LiNiPO4 are explored.It is found that the material prepared when n(oleylamine)∶n(metal)is 10∶1 has the optimal crystallinity,which can generate pure-phase LiNiPO4 through calcination under the optimized process parameters.In order to improve the electrochemical performance of LiNiPO4,LiFe0.06Ni0.94PO4/C is prepared by using ethyl cellulose as the carbon source for the first time,and its electrochemical performance is compared with that of pure phase LiNiPO4.The results from the electrochemical performance tests show that LiFe0.06 Ni0.94 PO4/C prepared from ethyl cellulose has a larger discharge specific capacity and smaller electrochemical impedance.Among them,the sample with 10wt%ethyl cellulose has the best electrochemical performance.
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