Duan Wenyuan, Zhao Mingshu, Shen Junfang, Zhao Suixin, Song Xiaoping
School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, Xi'an Jiaotong University, Xi'an, 710049, China.
Dalton Trans. 2017 Sep 28;46(36):12019-12026. doi: 10.1039/c7dt02341c. Epub 2017 Aug 30.
Herein, olivine LiFePO covered with graphene and carbon layers is prepared via a sol-gel method, followed by calcination, and the resultant composite is used as a cathode material in aqueous rechargeable lithium-ion batteries (ARLBs). The phase structure and morphology of the composite are characterized via X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and specific surface area analysis (BET). The ARLB system is fabricated using LiFePO/C/graphene as the cathode and a zinc anode in 1 mol L ZnSO·7HO and saturated LiNO aqueous solution without dissolved oxygen, which delivers a capacity of 153 mA h g at 0.5C rate. Even at a 50C rate, it maintains a capacity of 95 mA h g after 200 cycles. The excellent rate capabilities show that this cathode material exhibits good electrochemical performance and this novel ARLB has great potential in the fields of energy storage and high power sources.
在此，通过溶胶 - 凝胶法制备了覆盖有石墨烯和碳层的橄榄石型LiFePO，随后进行煅烧，并将所得复合材料用作水系可充电锂离子电池（ARLB）的正极材料。通过X射线衍射（XRD）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）和比表面积分析（BET）对复合材料的相结构和形貌进行了表征。以LiFePO/C/石墨烯为正极，锌为负极，在无氧的1 mol L ZnSO·7HO和饱和LiNO水溶液中构建了ARLB体系，该体系在0.5C倍率下的容量为153 mA h g。即使在50C倍率下，经过200次循环后仍保持95 mA h g的容量。优异的倍率性能表明该正极材料具有良好的电化学性能，这种新型ARLB在储能和高功率电源领域具有巨大潜力。
