Cross-Linked Binary Polymeric Binder of Polyacrylic Acid–Carboxymethyl Cellulose for Improving Phosphorus Anode,Advanced Functional Materials

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Cross-Linked Binary Polymeric Binder of Polyacrylic Acid–Carboxymethyl Cellulose for Improving Phosphorus Anode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-11-05 , DOI: 10.1002/adfm.202308325
Muyao Han ₁ , Xu Liang ₁ , Chengyu Han ₁ , Chaoyi Zhou ₂ , Qianxin Xiang ₂ , Yu Cao ₁ , Jie Sun _{1,

3}

Affiliation

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 (10⁻¹⁴–10² S cm⁻¹), and soluble intermediates (lithium polyphosphides, Li_xpPs) 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_xpPs). 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%).

中文翻译：

用于改进磷阳极的聚丙烯酸-羧甲基纤维素交联二元聚合物粘合剂

磷（P）是一种有前途的负极材料，具有高容量（2596 mAh g ^-1和6075-6924 mAh cm ^-3）、低锂离子扩散势垒（0.08 eV）和适当的锂化电位（≈0.7 V vs Li ^+） /李）。^{然而，巨大的体积膨胀（约300%）、低电子电导率（10 -14} –10 ² S cm ^-1）和可溶性中间体（多磷化锂，Li _x pPs）等问题限制了其性能。在这项工作中，设计了一种坚固的交联二元聚合物粘合剂聚丙烯酸-羧甲基纤维素（PAA/CMC）粘合剂，它具有良好的Li+电导率，并且不与聚磷酸锂（Li x pPs ^）发生_反应。所得复合材料P/CNT-PAA/CMC在1300 mA g ^{-1下循环200次后显示出1230.2 mAh g}^-1的高可逆容量，达到对照样品P/CNT-PVDF的10倍。P/CNT-PAA/CMC锂化后的体积膨胀仅为6%，远小于对照样品（83%）。

更新日期：2023-11-05

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