Nano-LiFePO4/C Derived from Gaseous-Oxidation Engineering-Synthesized Amorphous Mesoporous nano-FePO4 for High-Rate Li-Ion Batteries,Industrial & Engineering Chemistry Research

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Nano-LiFePO4/C Derived from Gaseous-Oxidation Engineering-Synthesized Amorphous Mesoporous nano-FePO4 for High-Rate Li-Ion Batteries
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-21 , DOI: 10.1021/acs.iecr.2c01006
Xiaopeng Li ₁ , Yan Meng _{1,

2} , Xiaojuan Chen ₁ , Yujue Wang ₂ , Dan Xiao _{1,

2}

Affiliation

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.

中文翻译：

Nano-LiFePO4/C 源自气态氧化工程-合成用于高倍率锂离子电池的非晶介孔纳米 FePO4

锂离子电池 (LIB) 非常需要快速充电/放电能力。LiFePO ₄作为一种低成本材料被广泛用于锂离子电池中。然而，较差的电子和离子电导率阻碍了其倍率性能。在此，连续臭氧氧化策略成功地制备了非晶介孔纳米FePO ₄ (O ₃ -FP)，然后将其用于合成高性能纳米LiFePO ₄ /C (nano-LFP/C)。连续的臭氧气泡是氧化 Fe(II) 盐和抑制沉淀纳米粒子聚集的关键，这得益于气泡限制效应和更高的 ζ 电位。得到的O ₃_{-FP显示出比常规液体氧化制备的FePO 4} (FP)更小且更均匀的粒径和更大的表面积。O ₃ -FP衍生的纳米LFP/C表现出均匀的碳涂层、更小更均匀的粒径以及更好的电化学性能。当用作 LIB 的阴极时，优化的电极在 1C 时可提供 160 mAh g-1 的高容量，^在150C 的超高倍率下可提供78 mAh g ^{-1的高容量。}此外，它还具有优异的高低温性能。本研究开发的均匀碳涂层纳米 LFP/C 简单、可扩展且对环境无害，使其有望用于纳米 LFP/C 的大规模生产。

更新日期：2022-06-21

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