Meng Yan, Wang Yujue, Zhang Zhaokun, Chen Xiaojuan, Guo Yong, Xiao Dan
School of Chemical Engineering, Sichuan University, Chengdu, 610065, China.
Institute of New Energy and Low-Carbon Technology (INELT), Sichuan University, Chengdu, 610207, China.
Sci Rep. 2019 Apr 30;9(1):6665. doi: 10.1038/s41598-019-43140-7.
A composite of olivine lithium manganese iron phosphate (LiMnFePO), external carbon coating and internal embedded carbon flakes, EC-IC-LMFP, is prepared by using phytic acid (PhyA) as phosphorus source via solvothermal process followed by calcination. The composite with improved electronic conductivity and ion diffusivity presents an ultrahigh reversible specific capacity of 193 mAh g at 0.1 C, and an excellent cycling stability of 93% capacity retention after 100 cycles at 1 C when applied as a cathode material for Li-ion batteries (LIBs). Additionally, the composite fine powders exhibit a special microstructure and its volumetric energy density is estimated to reach 1605 Wh L, much larger than the commercial LiFePO.
通过以植酸（PhyA）作为磷源，采用溶剂热法随后进行煅烧，制备了一种由橄榄石型锂锰铁磷酸盐（LiMnFePO）、外部碳涂层和内部嵌入碳片组成的复合材料，即EC-IC-LMFP。该复合材料具有改善的电子导电性和离子扩散率，在0.1C时表现出193 mAh g的超高可逆比容量，并且在作为锂离子电池（LIBs）的阴极材料时，在1C下循环100次后具有93%的容量保持率的优异循环稳定性。此外，该复合细粉呈现出特殊的微观结构，其体积能量密度估计达到1605 Wh L，远大于商业LiFePO。
