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

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

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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.

3D conductive networkBiochar carbon-silicon anodeHeteroatoms doping strategyDFT calculationLithium-ion battery

Jun Cao、Jianhong Gao、Kun Wang、Zhuoying Wu、Xinxin Zhu、Han Li、Min Ling、Chengdu Liang、Jun Chen

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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

National Natural Science Foundation of ChinaBasic Public Welfare Research Special Project of Zhejiang ProvinceQuzhou Science and Technology Plan ProjectScience and Technology Project of Quzhou Research Institute,Zhejiang UniversityScience and Technology Project of Quzhou Research Institute,Zhejiang UniversityScience and Technology Project of Quzhou Research Institute,Zhejiang UniversityIndependent scientific Research Project of Quzhou Research Institute,Zhejiang UniversityNew"115 talents"Project of Quzhou,National Nature Science Foundation of ChinaFundamental Research Funds for the Central University

12205252LZY22B0400012022K39IZQ2021KJ2032IZQ2022KJ3014IZQ2022KJ3002IZQ2021RCZX00752172244226202200053

2024

10.1016/j.jmst.2023.07.026

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)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.173(6)
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