具有优异力学性能和电导率的LA132@CMC-Na水系复合粘结剂制备及适配锂电硅基负极研究

doi:10.19799/j.cnki.2095-4239.2025.0663

摘要/Abstract

摘要：

粘结剂是锂离子电池的重要组成部分，选取性能适配的高效粘结剂可以协助电极材料稳定储锂。本文制备了一种以氢键相连接的水系复合粘结剂（命名为LA132@CMC-Na），并对其在硅基材料中的性能表现进行研究。高效的分子间氢键赋予了LA132@CMC-Na粘结剂优异的力学性能，其弹性自愈的特性可以有效缓解硅基材料在嵌/脱锂过程中的体积变化。LA132@CMC-Na粘结剂分子链上含有的丰富活性基团还可以凭借其高电子活性来促进硅基材料储锂反应中的锂离子扩散动力学，同时降低电池的运行内阻。采用LA132@CMC-Na粘结剂的半电池在0.2 A g-1电流密度下循环200圈后仍具有1415.21 mAh g-1的可逆高比容量且无明显容量衰减，以上工作可以为锂离子电池高性能硅基负极粘结剂的研究提供经验并有望应用于实际生产。

关键词: 水系复合粘结剂, 硅基负极, 氢键, 电导率, 力学性能

Abstract:

Binders play a crucial role in lithium-ion batteries and selecting high-performance binders with compatible properties can enhance the stability of electrode materials during lithium storage. This study developed a water-based composite binder interconnected by hydrogen bonds designated as LA132@CMC-Na and investigated its performance in silicon-based materials The efficient intermolecular hydrogen bonds endowed the LA132@CMC-Na binder with superior mechanical properties while its elastic self-healing capability effectively mitigated the volume expansion of silicon-based materials during lithiation/delithiation The abundant active functional groups on the molecular chains of LA132@CMC-Na further facilitated lithium-ion diffusion kinetics in the silicon-based electrode owing to their high electron activity while simultaneously reducing the internal resistance of the battery Half-cells employing the LA132@CMC-Na binder delivered a high reversible specific capacity of 1415.2 mAh g^-1 after 200 cycles at 0.2 A g^-1 with no significant capacity decay. These findings provide valuable insights for the development of high-performance binders for silicon-based anodes in lithium-ion batteries and demonstrate promising potential for practical applications.

Key words: water-based composite binder, silicon-based anode, hydrogen bonds, electrical conductivity, mechanical properties

中图分类号:

TB39

任文兴, 王亚龙, 陈鹏飞, 梁光, 李佩华, 王剑. 具有优异力学性能和电导率的LA132@CMC-Na水系复合粘结剂制备及适配锂电硅基负极研究[J]. 储能科学与技术, doi: 10.19799/j.cnki.2095-4239.2025.0663.

Wenxing Ren, Yalong Wang, Pengfei Chen, Guang Liang, Peihua Li, Jian Wang. A water-based composite binder interconnected by hydrogen bonds exhibiting outstanding mechanical properties and electrical conductivity for silicon-based anodes in lithium-ion batteries[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2025.0663.

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样品命名	活性物质/%	导电剂/%	粘结剂/%
SSGC-P	60 Si/SiO_x-G-C	20	20 PVDF
SSGC-L@C	60 Si/SiO_x-G-C	20	20 LA132@CMC-Na
SSGC-L@C-21	60 Si/SiOx-G-C	20	20 LA132@CMC-Na-21
SSGC-L@C-12	60 Si/SiOx-G-C	20	20 LA132@CMC-Na-12
SSGC-L	60 Si/SiO_x-G-C	20	20 LA132
SSGC-C	60 Si/SiO_x-G-C	20	20 CMC-Na
Si-P	60 Si	20	20 PVDF
Si-L@C	60 Si	20	20 LA132@CMC-Na

体系名称	元素	含量（mg/L）
SSGC-L	Si	186.26
SSGC-C	Si	181.57
SSGC-L@C	Si	116.39
SSGC-C	Na	72.29
SSGC-L@C	Na	59.66

样品	低电流密度下容量 (mAh g-1)	高电流密度下容量 (mAh g-1)
Si/SiOx-G-C [4]	1052.6 (0.2 A g-1)	309.0 (4.0 A g-1)
PAA [9]	1050.0 (0.1 A g-1)	184.0 (0.5 A g-1)
P-P250@Si-800 [31]	501.8 (0.2 A g-1)	217.0 (2.0 A g-1)
Si@void/CNF [32]	913.6 (0.1 A g-1)	487.4 (1.0 A g-1)
Nano-Si/G/C-2 [33]	1284.0 (0.2 A g-1)	368.0 (1.0 A g-1)
SSGC-L@C（本工作）	1415.2 (0.2 A g-1)	804.1 (1.0 A g-1)