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Co-based metal–organic framework and its derivatives as high-performance anode materials for lithium-ion batteries

Gou, Lei, Ma, Li, Zhao, Ming-Juan, Liu, Peng-Gang, Wang, Xue-Dong, Fan, Xiao-Yong, Li, Dong-Lin
Journal of materials science 2019 v.54 no.2 pp. 1529-1538
annealing, anodes, cobalt oxide, coordination polymers, electrochemistry, electrolytes, lithium, lithium batteries, temperature
The syntheses and lithium storage performances of a Co-based metal–organic framework (MOF) and its derivatives were reported. Co₂(NDC)₂DMF₂ was synthesized by a facile one-pot solvothermal method. Its derivatives were obtained via controllably calcining Co-based MOF at different annealing temperatures. Both the pristine MOFs and derivatives had electrochemical performance; especially, the Co₃O₄ derivative obtained by calcined at 350 °C for 3 h (denoted as Co-3) exhibited the best lithium storage capacity. As anode material for lithium-ion batteries (LIBs), Co-3 showed a high reversible specific capacity (1058.9 mAh g⁻¹ after 100 cycles at a current density of 200 mA g⁻¹), remarkable cycling performance and an excellent rate performance with high average discharge specific capacities of 1066, 843, 552, 428 and 348 mAh g⁻¹ at 100, 200, 500, 1000 and 2000 mA g⁻¹, respectively. The excellent electrochemical performance may be attributed to the formation of small particles in nanoscale and meso-pores during the calcination process which increase the contact surface areas between electrolyte and active materials, shorten the lithium-ions diffusion pathways and accommodate the volume variations during cycling.