Constructing globally consecutive 3D conductive network using P-doped biochar cotton fiber for superior performance of silicon-based anodes

Jun Cao ¹Jianhong Gao ¹Kun Wang ¹Zhuoying Wu ¹Xinxin Zhu ¹Han Li ¹Min Ling ²Chengdu Liang ²Jun Chen²

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作者信息

1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China
2. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Institute of Zhejiang University-Quzhou,Zheda Road 99,Quzhou 324000,China
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Abstract

The inferior conductivity and drastic volume expansion of silicon still remain the bottleneck in achieving high energy density Lithium-ion Batteries(LIBs).The design of the three-dimensional structure of elec-trodes by compositing silicon and carbon materials has been employed to tackle the above challenges,however,the exorbitant costs and the uncertainty of the conductive structure persist,leaving ample room for improvement.Herein,silicon nanoparticles were innovatively composited with eco-friendly biochar sourced from cotton to fabricate a 3D globally consecutive conductive network.The network serves a dual purpose:enhancing overall electrode conductivity and serving as a scaffold to maintain electrode in-tegrity.The conductivity of the network was further augmented by introducing P-doping at the optimum doping temperature of 350 ℃.Unlike the local conductive sites formed by the mere mixing of silicon and conductive agents,the consecutive network can affirm the improvement of the conductivity at a macro level.Moreover,first-principle calculations further validated that the rapid diffusion of Li+is attributed to the tailored electronic microstructure and charge rearrangement of the fiber.The prepared consecutive conductive Si@P-doped carbonized cotton fiber anode outperforms the inconsecutive Si@Graphite anode in both cycling performance(capacity retention of 1777.15 mAh g-1 vs.682.56 mAh g-1 after 150 cy-cles at 0.3 C)and rate performance(1244.24 mAh g-1 vs.370.28 mAh g-1 at 2.0 C).The findings of this study may open up new avenues for the development of globally interconnected conductive networks in Si-based anodes,thereby enabling the fabrication of high-performance LIBs.

Key words

3D conductive network/Biochar carbon-silicon anode/Heteroatoms doping strategy/DFT calculation/Lithium-ion battery

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基金项目

National Natural Science Foundation of China(12205252)

Basic Public Welfare Research Special Project of Zhejiang Province(LZY22B040001)

Quzhou Science and Technology Plan Project(2022K39)

Science and Technology Project of Quzhou Research Institute,Zhejiang University(IZQ2021KJ2032)

Science and Technology Project of Quzhou Research Institute,Zhejiang University(IZQ2022KJ3014)

Science and Technology Project of Quzhou Research Institute,Zhejiang University(IZQ2022KJ3002)

Independent scientific Research Project of Quzhou Research Institute,Zhejiang University(IZQ2021RCZX007)

New"115 talents"Project of Quzhou,National Nature Science Foundation of China(52172244)

Fundamental Research Funds for the Central University(226202200053)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量57

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