首页|Elucidating the role of embedding dispersed cobalt sites in nitrogen-doped carbon frameworks in Si-based anodes for stable and superior storage

Elucidating the role of embedding dispersed cobalt sites in nitrogen-doped carbon frameworks in Si-based anodes for stable and superior storage

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Unsatisfactory conductivity and volume effects have hindered the commercial application of silicon-based materials as advanced anode materials for high-performance lithium-ion batteries.Herein,nitro-gen doped carbon silicon matrix composite with atomically dispersed Co sites(Si/Co-N-C)is obtained via the design of the frame structure loaded with nano-components and the multi-element hybrid strat-egy.Co atoms are uniformly fixed to the N-C frame and tightly packed with nanoscale silicon particles as an activation and protection building block.The mechanism of the N-C framework of loaded metal Co in the Si alloying process is revealed by electrochemical kinetic analysis and ex situ characterization tests.Impressively,the nitrogen-doped Co site activates the intercalation of the outer carbon matrix to supple-ment the additional capacity.The Co nanoparticles with high conductivity and support enhance the con-ductivity and structural stability of the composite,accelerating the Li+/Na+diffusion kinetics.Density functional theory(DFT)calculation confirms that the hetero-structure Si/Co-N-C adjusts the electronic structure to obtain good lithium-ion adsorption energy,reduces the Li+/Na+migration energy barrier.This work provides meaningful guidance for the development of high-performance metal/non-metal modified anode materials.

Co nanoparticlesNitrogen doped carbonSiliconLithium/sodium storageMetal-organic frameworks(MOFs)

Yueying Chen、Ping Li、Mianying Huang、Chunlei Wu、Qianhong Huang、Tingyang Xie、Xiaoming Lin、Akif Zeb、Yongbo Wu、Zhiguang Xu、Yuepeng Cai

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Joint Laboratory of Energy and Materials Chemistry(South China Normal University-Guangzhou Tianci New Materials Co.Ltd.),Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong,China

Department of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,Jiangxi,China

Guangzhou Huifu Research Institute Co.Ltd,Nanxiang San Lu,Guangzhou 510663,Guangdong,China

Key Laboratory of Atomic and Subatomic Structure and Quantum Control(Ministry of Education),Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter,School of Physics,South China Normal University,Guangzhou 510006,Guangdong China

Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,Guangdong-Hong Kong Joint Laboratory of Quantum Matter,South China Normal University,Guangzhou 510006,Guangdong,China

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2024

10.1016/j.jechem.2024.06.022

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.98(11)