Engineering Prelithiation of Polyacrylic Acid Binder: A Universal Strategy to Boost Initial Coulombic Efficiency for High‐Areal‐Capacity Si‐Based Anodes

作者：Zeheng Li, Weiting Tang, Yajun Yang, Guoyong Lai, Zheng Lin, Huayan Xiao, Juncheng Qiu, Xiujuan Wei, Shuxing Wu, Zhan Lin · 发表于：Advanced Functional Materials · 年份：2022 · DOI：10.1002/adfm.202206615 · 被引用次数：157 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

Abstract The low initial Coulombic efficiency (ICE) and insufficient cycling lives of silicon (Si)‐based anodes seriously hinder their eventual introduction into next‐generation high‐energy‐density lithium–ion batteries (LIBs). Herein, an engineering prelithiation binder strategy based on polyacrylic acid (Li x PAA) is proposed for representative SiO x anodes. The ICEs and cycling lives of SiO x anodes are significantly improved by precisely controlling the lithiation degree of PAA binder. The ICE of the high‐loading (3.0 mg cm −2 ) SiO x electrode increases by 10.9% when the Li 0.75 PAA binder replaces the PAA binder. Moreover, the working mechanism of the lithiation binder strategy to improve the electrochemical performances (especially for ICE) is systematically investigated, which is universally applied to other Si anodes such as Si nanoparticles and Si/graphite. This universal binder strategy and proposed working mechanism provide enlightenment on constructing high‐ICE, high‐energy‐density, and long‐life Si‐based anodes.