材料科学
电解质
阴极
锂(药物)
同种类的
催化作用
离子
化学工程
接口(物质)
无机化学
电极
物理化学
复合材料
热力学
有机化学
化学
医学
物理
毛细管数
毛细管作用
工程类
内分泌学
作者
Mi‐Li Liu,Yiran Ying,Jiangwen Liu,Chen Li,Renzong Hu,Бо Лю,Baoying Huang,Anwei Zhang,Longtao Ma,Liuzhang Ouyang,Min Zhu
标识
DOI:10.1002/aenm.202403696
摘要
Abstract Lithium iron phosphate (LFP) cathode is renowned for high thermal stability and safety, making them a popular choice for lithium‐ion batteries. Nevertheless, on one hand, the fast charge/discharge capability is fundamentally constrained by low electrical conductivity and anisotropic nature of sluggish lithium ion (Li + ) diffusion. On the other hand, the interface and internal structural degradation occurs when subjected to high‐rate condition. Herein, a multifunctional boron‐doping graphene/lithium carbonate (BG/LCO) nanointerfacial layer on surface of commercial LiFePO 4 particles is designed, in which the BG layer catalyzes the rapid reaction of Li 2 CO 3 ‐LiPF 6 for homogeneous and mechanically robust inorganic LiF‐rich structure across the cathode‐electrolyte interphase (CEI), forms a conductive network to significantly enhance both electron and Li + transport, and strengthens the FeO bonding to minimize both Fe loss and the formation of Fe‐Li antisite defects. Correspondingly, the modified LFP cathode achieves a high capability of 113.2 mAh g −1 at 10 C and extraordinary cyclic stability with 88.0% capacity retention over 1000 cycles as compared to the pristine LFP cathode with a capacity of only 94.0 mAh g −1 and 64.6% capacity retention. It also exhibits great enhancements of 20.1% and 3.7% at higher‐rate condition (room temperature/15 C) and the low temperature condition (−10 °C/1 C), respectively.
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