一步法制备锗/MXene复合材料及其作为锂离子电池负极的研究

通过化学溶液法一步制备锗/MXene复合材料,在MXene表面均匀负载了锗金属纳米颗粒。采用SEM和TEM对Ge/MXene复合材料进行了微观形貌分析,探索了复合材料的形成过程,结果表明,Ge/MXene复合材料是二维结构形貌,其元素分布均一。用Ge/MXene复合材料制备了电极,并组装成纽扣电池进行充放电性能测试,对电池的比容量、倍率、循环稳定性能进行了系统分析。测试结果表明,Ge含量为50%时的电化学性能最佳,0.2C下第5～100圈的容量稳定在1200 m Ah/g,载量为1 mg/cm²;载量提高到2 mg/cm²时的比容量依然能达到450 m Ah/g。

Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries

Ge nanoparticles were synthesized uniformly on MXene sheets via a one-step chemical solution method. Morphology of Ge/MXene was characterized by SEM and TEM. Formation process and optimized synthesis condition was analyzed carefully. Ge/MXene was used as anode for lithium-ion batteries. Their electrochemical performances, including capacity, rate and cycling stability, were tested and evaluated. Ge/MXene exhibited a greatly improved capacity of 1200 mAh/g during the first hundred cycles at 0.2C with a loading of 1 mg/cm ². A capacity of 450 mAh/g at a higher loading of 2 mg/cm ² was obtained after 100 cycles. The excellence in electrochemistry is attributed to the high conductivity of MXene and its accommodable interlayer space.