阳极
材料科学
电化学
锂(药物)
电极
硒化物
金属有机骨架
电流密度
碳纤维
电阻率和电导率
化学工程
铜
纳米技术
复合材料
冶金
化学
吸附
电气工程
内分泌学
工程类
物理化学
有机化学
物理
复合数
硒
医学
量子力学
作者
Jiaoyu Xiao,Hongdong Liu,Jiamu Huang,Yao Lü,Lei Zhang
标识
DOI:10.1016/j.apsusc.2020.146746
摘要
Transition metal selenides (TMSs) are potential high-power lithium-ion batteries (LIBs) electrode materials because of its considerable theoretical capacity and high electrical conductivity. However, through the electrochemical conversion reaction, the structure of TMSs may be easily destroyed due to its terrible volume effect, which thereby greatly reducing the electrode’s capacitance and cycle life. In this paper, we have synthesized carbon-encapsulated Cu1.8Se decahedron nano-composites (Cu1.8[email protected]) using a metal–organic framework Cu-BTC as template. When applied in anode for LIBs, due to the synergistic effects of tiny copper selenide, integral porous decahedron and exceptional carbon-encapsulated structure, the Cu1.8[email protected] nano-composites exhibit improved specific capacity, superior rate capability and exceptional cycling stability. The initial discharge specific capacity of Cu1.8[email protected] °C is 1186.6 mAh g−1 at a current density of 0.1 A g−1, and after 200 cycles, the specific capacity drops to 824.4 mAh g−1. What’s more, at a current density of 1 A g−1, the Cu1.8[email protected] °C electrode still possesses a considerable specific capacity of 320.3 mAh g−1 after 1000 cycles. In light of our findings, we propose a metal–organic frameworks (MOFs) templates strategy to synthesize in situ carbon-encapsulated TMSs electrode materials with outstanding electrochemical performance for LIBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI