Bi Works as a Li Reservoir for Promoting the Fast‐Charging Performance of Phosphorus Anode for Li‐Ion Batteries

作者：Shaojie Zhang, Yiming Zhang, Ziyi Zhang, Huili Wang, Yu Cao, Baoshan Zhang, Xinyi Liu, Chong Mao, Xinpeng Han, Haochen Gong, Zhanxu Yang, Jie Sun · 发表于：Advanced Energy Materials · 年份：2022 · DOI：10.1002/aenm.202103888 · 被引用次数：97 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Abstract Phosphorus anodes are a promising for fast‐charging high‐energy lithium‐ion batteries because of their high specific capacity (2596 mAh g–1) and suitable lithiation potential (0.7 V vs Li+/Li). To solve the large volumetric change and inherent poor electrical conductivity, various carbon‐based materials have been studied for loading P. However, the local aggregation of Li ions and electrons in P particles especially in the fast‐charging process induces an uneven lithiation reaction and the great transient stress, leading to poor fast‐charging performance. Herein, bismuth nanoparticles are implanted into a P/graphite (P/C) composite using ball milling. The Bi anode works as a small Li reservoir for trapping Li in the lithiation process and emitting Li in delithiation process prior to P anode, because the Bi anode has a starting lithiation/delithiation potential that is a little bit higher/lower than the P anode. Moreover, the low Li diffusion barrier in Bi and the stable interface between Bi and P enhance the Li reservoir effect of Bi, which promotes fast and uniform lithiation/delithiation reactions and avoids continuous cracking of the Bi‐P/C electrode. Therefore, the Bi‐P/C anode provides a high fast‐charging capacity of 1755.7 mAh g–1 at 7.8 A g–1 (5.2 C) and a high capacity retention of 86.3% after 300 cycles.