用于锂离子电池的尖晶石LiMnO/3DG高性能复合材料。

High performance composites of spinel LiMnO/3DG for lithium ion batteries.

作者信息

Luo X D, Yin Y Z, Yuan M, Zeng W, Lin G, Huang B, Li Y W, Xiao S H

机构信息

Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology Guilin 541004 China

Guilin University of Technology, Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Guilin 541004 China.

出版信息

RSC Adv. 2018 Jan 3;8(2):877-884. doi: 10.1039/c7ra12613a. eCollection 2018 Jan 2.

A highly crystalline nanosized spinel LiMnO/3DG composite cathode material for high rate lithium ion batteries was successfully prepared by mixing spinel LiMnO particles with reduced graphene oxide (3DG). Spinel LiMnO and reduced three-dimensional graphene oxide were synthesized using a hydrothermal method and freeze-drying technology, respectively. The structure, morphology and electrochemical performance of the synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge techniques. The results showed that the LiMnO/3DG composites exhibited excellent rate capability and stable cycling performance. The discharge capacity was 131 mA h g and the capacity remains at 89.3% after 100 cycles at a 0.5 C rate, while the discharge capacity was 90 mA h g at 10 C. Compared with spinel LiMnO materials, the LiMnO/3DG composites showed obvious improvement in electrochemical performance.

通过将尖晶石LiMnO颗粒与还原氧化石墨烯（3DG）混合，成功制备了一种用于高倍率锂离子电池的高结晶度纳米尖晶石LiMnO/3DG复合正极材料。尖晶石LiMnO和还原的三维氧化石墨烯分别采用水热法和冷冻干燥技术合成。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、循环伏安法（CV）、电化学阻抗谱（EIS）和恒电流充放电技术对合成材料的结构、形貌和电化学性能进行了表征。结果表明，LiMnO/3DG复合材料表现出优异的倍率性能和稳定的循环性能。在0.5 C倍率下，放电容量为131 mA h/g，100次循环后容量保持在89.3%，而在10 C时放电容量为90 mA h/g。与尖晶石LiMnO材料相比，LiMnO/3DG复合材料的电化学性能有明显改善。