ZIF-67衍生LDHs中空结构复合硅负极储锂性能研究

doi:10.15541/jim20260040

摘要/Abstract

摘要： 硅(Si)基锂离子电池负极材料具有理论比容量高(4200 mAh·g^-1)、工作电位低、储量丰富及环境友好等优势,然而,硅材料在嵌锂过程中会发生约400%的体积膨胀,易导致电极开裂和粉化。鉴于此,本研究提出一种蚀刻-掺杂-重构策略,以钴基沸石咪唑酯骨架材料(ZIF-67)为自牺牲模板合成钴铁层状双金属氢氧化物(LDHs),成功制备了具有中空结构的复合硅基负极材料(Si@CoFeO_x)。制备的半电池在1 A·g^-1电流密度下循环600圈后,仍保持952.6 mAh·g^-1的可逆比容量;在2 A·g^-1大电流下循环400圈后,比容量仍达427.7 mAh·g^-1,这主要源于其中空结构有效缓冲了硅纳米颗粒在循环过程中的体积变化。本研究为高性能锂离子电池硅基负极材料的结构设计提供了借鉴。

关键词: 硅碳负极, 锂离子电池, 中空结构, 高电导率, ZIF-67, LDHs

Abstract: Silicon (Si)-based anode materials of Li-ion batteries have attracted extensive attention owing to their high theoretical specific capacity (4200 mAh·g⁻¹), low working potential, abundant resources, and environmental friendliness. However, Si undergoes a volume expansion of approximately 400% during lithiation, which readily leads to electrode cracking and pulverization. This study proposes a doping-etching-reconstruction strategy utilizing cobalt-based zeolitic imidazolate framework (ZIF-67) as a sacrificial template to synthesize cobalt-iron layered double hydroxides (LDHs), fabricating a composite silicon-based anode material with a hollow structure (Si@CoFeO_x). This material maintains a reversible specific capacity of 952.6 mAh·g^-1 after 600 cycles at a current density of 1 A·g^-1, and retains a specific capacity of 427.7 mAh·g^-1 after 400 cycles at a high current density of 2 A·g^-1. The superior electrochemical performance of this composite is primarily attributed to its hollow structure, which effectively accommodates the volume expansion of silicon nanoparticles during cycling. This study provides insights into the structural design of high-performance Si-based anode materials for lithium-ion batteries.

Key words: silicon-carbon composite anode, Li-ion battery, hollow structure, high electrical conductivity, ZIF-67, LDHs

中图分类号:

TQ174

秦宗步, 石文华, 王林东, 王瑞晴, 胡执一, 李昱. ZIF-67衍生LDHs中空结构复合硅负极储锂性能研究[J]. 无机材料学报, DOI: 10.15541/jim20260040.

QIN Zongbu, SHI Wenhua, WANG Lindong, WANG Ruiqing, HU Zhiyi, LI Yu. ZIF-67-Derived Hollow-Structured LDHs Si composite anode for Enhanced Performance on Lithium Storage[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260040.

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