Abstract
Spinel MnCo2O4 is a promising energy storage candidate as anode materials in lithium-ion batteries owing to synergistic effects of two intrinsic solid-state redox couples.However,low conductivity,poor rate capacity and rapid capacity fading have seriously impaired its practical applications.To overcome the inferiorities,urchin-like MnCo2O4@C core-shell nanowire arrays have been fab-ricated directly within a porous copper current collector via a facile hydrothermal method followed by a chemical vapor deposition carbonization process.In a typical nano-wire,the core is composed of interconnected MnCo2O4 nanoparticles and the shell shows as a thin amorphous carbon layer.The integrated MnCo2O4@C/Cu structure could act as working anodes without using additives or polymer binders.While MnCo2O4@C/Cu possesses slightly longer Li-ion insertion/desertion pathway than that of MnCo2O4/Cu,the carbon shell could effectively prevent the pulverization of MnCo2O4 and lower down charge transfer resistance and actively participate in Li-ion cycles.The rearrangement of carbon atoms during lithiation/delithiation cycling could inhibit the formation of passive solid electrolyte interphase films.As a result,the MnCo2O4@C/Cu electrode presents superior rate capacity(600 mAh·g-1 at 1 A·g-1)and better stability(797 mAh·g-1 after 200 cycles at 100 mA·g-1).The excellent reversible Li ion storage capacity,cycling stability and rate capacity endow MnCo2O4@C/Cu great potential as stable and high output integrated anode materials in Li-ion batteries.
基金项目
国家自然科学基金(52072106)
Science and Technology Major Project of Anhui Province(202003a05020007)
111 Project New Materials and Technology for Clean Energy(B18018)
中央高校基本科研业务费专项(JZ2019HGBZ0134)
中央高校基本科研业务费专项(PA2019GDZC0096)
Enterprise Entrusted Project(W2021JSKF0868)
NETL
NSTL
万方数据