Cross‐Linked Binary Polymeric Binder of Polyacrylic Acid–Carboxymethyl Cellulose for Improving Phosphorus Anode
Muyao Han, Liang Xu, Chengyu Han, Chaoyi Zhou, Qianxin Xiang, Yu Cao, Jie Sun
Abstract
Abstract Phosphorus (P) is a promising anode material with high capacity (2596 mAh g −1 and 6075–6924 mAh cm −3 ), low lithium‐ion diffusion barrier (0.08 eV), and appropriate lithiation potential (≈0.7 V vs Li + /Li). However, the problems of huge volume expansion (≈300%), low electronic conductivity (10 −14 –10 2 S cm −1 ), and soluble intermediates (lithium polyphosphides, Li x pPs) restrict its performance. In this work, a robust, cross‐linked binary polymeric binder polyacrylic acid–carboxymethyl cellulose (PAA/CMC) binder is designed, which has good Li + conductivity and is not reactive with lithium polyphpsphode (Li x pPs). The resulting composite P/CNT‐PAA/CMC displays a high reversible capacity of 1230.2 mAh g −1 after 200 cycles at 1300 mA g −1 , achieving 10 times as much as the control sample P/CNT‐PVDF. The volume expansion after lithiation of P/CNT‐PAA/CMC is only 6%, far less than that of the control sample (83%).