纳米-
材料科学
介孔材料
无定形固体
纳米颗粒
化学工程
涂层
阴极
电化学
电极
粒径
纳米技术
粒子(生态学)
离子
碳纤维
复合数
催化作用
化学
复合材料
有机化学
工程类
海洋学
物理化学
地质学
作者
Xiaopeng Li,Yan Meng,Xiaojuan Chen,Yujue Wang,Dan Xiao
标识
DOI:10.1021/acs.iecr.2c01006
摘要
Fast charging/discharging capabilities are highly desirable for Li-ion batteries (LIBs). LiFePO4 as a low-cost material is widely used in LIBs. However, the poor electronic and ionic conductivity hinder its rate performance. Herein, a continuous ozone-oxidation strategy is successfully used to prepare amorphous mesoporous nano-FePO4 (O3-FP), which is then used to synthesize high-performance nano-LiFePO4/C (nano-LFP/C). The continuous ozone bubbles are the key to oxidize the Fe(II) salts and restrain the aggregation of precipitated nanoparticles benefiting from the gas bubble confinement effect and a higher ζ potential. The obtained O3-FP shows a smaller and more uniform particle size, and a larger surface area than the conventional liquid oxidation-prepared FePO4 (FP). The O3-FP-derived nano-LFP/C exhibits a uniform carbon coating, a smaller and more even particle size, and better electrochemical performance. When used as cathode for LIBs, the optimized electrode delivers a high capacity of 160 mAh g–1 at 1C and 78 mAh g–1 at an ultrahigh rate of 150C. Moreover, it also possesses excellent high- and low-temperature performance. The uniform-carbon-coating nano-LFP/C developed in this research is simple, scalable, and environmentally benign, making it promising for mass production of nano-LFP/C.
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