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介绍了一种构建钴铝层状双金属氢氧化物/碳球(CoAl-LDH/CSs)复合物的新设计路线。通过生长法使CoAl-LDH生长在CSs上,生长在CSs上的CoAl-LDH薄层由厚度为20 nm的纳米片组成。恒流充放电测试表明,CoAl-LDH/CSs复合物在6 mol/L KOH溶液中以1 A/g的电流密度充放电的比容量为1198 F/g(基于CoAl-LDH/CSs复合物的质量),甚至在高达10 A/g的大电流密度下仍然呈现出920 F/g的较高比容量。而且该复合物以2 A/g的电流密度充放电循环1000次后仍保留928 F/g的比容量,比容量的保留率为84%,这表明与纯的CoAl-LDH相比,CoAl-LDH/CSs复合物具有较高的比容量、优良的倍率性能和良好的循环稳定性。
A new design route to construct CoAl-LDH / CSs composites was introduced. CoAl-LDH was grown on CSs by growth method, and the thin layer of CoAl-LDH grown on CSs consisted of nanosheets with a thickness of 20 nm. The constant current charge and discharge tests showed that the specific capacity of CoAl-LDH / CSs composite charged and discharged at a current density of 1 A / g in 6 mol / L KOH solution was 1198 F / g (based on the CoAl-LDH / CSs complex Mass), still exhibiting a higher specific capacity of 920 F / g even at high current densities up to 10 A / g. Moreover, the composite retains a specific capacity of 928 F / g after a charge and discharge cycle of 1000 A at a current density of 2 A / g for a specific capacity of 84%, indicating that compared with pure CoAl-LDH, LDH / CSs complex has high specific capacity, excellent rate performance and good cycle stability.