Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion batt...Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO/C hollow nanospheres. During the hydrothermal process, polystyrenen anospheres are employed not only as the template but also, more tactfully, as carb on source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nano spheres as a LIB cathode delivers a desired stable capacity at each rate stage, and eve n at a high rate of 10 C, the hollow nano sphere cathode can prese nt a specific discharge capacity as high as 50.5 mAh·g^-1. After 100 cycles, the capacity rete ntions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nano sphere cathode.展开更多
基金the National Natural Science Foundation of China (Nos. 21503134 and 21406220)the Science Foundation of Ministry of Education of China (No. 413064)+2 种基金PSA Peugeot Citroen (No. 13H100000584)Shanghai Jiao Tong University New Faculty Startup Funds (No. 14X10040061)the Science and Technology Commission of Shanghai Municipality (NO.15YF1406500).
文摘Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO/C hollow nanospheres. During the hydrothermal process, polystyrenen anospheres are employed not only as the template but also, more tactfully, as carb on source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nano spheres as a LIB cathode delivers a desired stable capacity at each rate stage, and eve n at a high rate of 10 C, the hollow nano sphere cathode can prese nt a specific discharge capacity as high as 50.5 mAh·g^-1. After 100 cycles, the capacity rete ntions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nano sphere cathode.
