改性聚丙烯腈与羧甲基纤维素交联构建氢键网络用于高性能硅阳极,Inorganic Chemistry Frontiers

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改性聚丙烯腈与羧甲基纤维素交联构建氢键网络用于高性能硅阳极
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2023-10-27 , DOI: 10.1039/d3qi01737k
Han Li ₁ , Zhengwei Wan ₁ , Tong Wu ₁ , Kun Wang ₁ , Xiangxiang Wang ₁ , Jun Cao ₁ , Min Ling _{1,

2} , Dongxu Yu _{1,

2} , Chengdu Liang _{1,

2}

Affiliation

聚丙烯腈（PAN）由于其固有的弹性和形成共轭结构的倾向，已被研究作为锂离子电池硅阳极的有效粘合剂和涂层材料。然而，实现电导率、结合强度和弹性之间的平衡是研究人员面临的挑战。在此，系统地研究了 PAN 在煅烧过程中的结构和性能演变，以实现平衡的电导率和弹性。此外，通过使用羧甲基纤维素（CMC）作为PAN的增稠剂，建立氢键网络来解决结合强度低的问题。所制备的Si@cPAN@CMC电极在1 A g ^{-1下循环100次后放电容量为2358 mA hg}^-1，初始库仑效率（ICE）为91.0%，容量保持率为93.8%。此外，该电极在1 A g -1 ^{1000 mA hg -1}^的有限充放电容量下表现出近700次循环的稳定循环寿命，并且质量负载为3.0 mg cm ^-2的电极表现出高面积比。在0.5 A g ^-1下循环50次后容量为5.0 mA h cm ^-2。因此，这项工作为设计有前景的锂离子电池阳极多功能涂层开辟了一条新途径。

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Modified polyacrylonitrile cross-linked with carboxymethyl cellulose constructing a hydrogen bonding network for high-performance silicon anodes

Polyacrylonitrile (PAN) has been investigated as an effective binder and coating material for silicon anodes in lithium ion batteries due to its inherent elasticity and the propensity to form conjugated structures. However, achieving a balance among the conductivity, binding strength and elasticity is a challenge faced by researchers. Herein, the structural and property evolution of PAN during calcination is systematically investigated to realize balanced conductivity and elasticity. Additionally, a hydrogen bonding network is established to address the issue of low binding strength by applying carboxymethyl cellulose (CMC) as the thickening agent for PAN. The as-prepared Si@cPAN@CMC electrode demonstrated a discharge capacity of 2358 mA h g⁻¹ after 100 cycles at 1 A g⁻¹, with an initial coulombic efficiency (ICE) of 91.0% and a capacity retention of 93.8%. Furthermore, the electrode exhibited a stable cycling life of nearly 700 cycles under a limited charge and discharge capacity of 1000 mA h g⁻¹ at 1 A g⁻¹, and the electrode with a mass loading of 3.0 mg cm⁻² demonstrated a high areal capacity of 5.0 mA h cm⁻² after 50 cycles at 0.5 A g⁻¹. Therefore, this work opens a new avenue for designing a multifunctional coating layer for promising anodes of lithium-ion batteries.

更新日期：2023-10-27

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