首页|Structural engineering of hard carbon through spark plasma sintering for enhanced sodium-ion storage

Structural engineering of hard carbon through spark plasma sintering for enhanced sodium-ion storage

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Hard carbon(HC)has emerged as one of the superior anode materials for sodium-ion batteries(SIBs),with its electrochemical performance significantly influ-enced by the presence of oxygen functional groups and its closed pore structure.However,current research on the structural adjustment of these oxygen functional groups and the closed pore architecture within HC remains lim-ited.Herein,energy-efficient and contamination-free spark plasma sintering technology was employed to tune the structure of coconut-shell HC,resulting in significant adjustments to the content of carboxyl(decreasing from 5.71 at％to 2.12 at％)and hydroxyl groups(decreasing from 7.73 at％to 6.26 at％).Crucially,these modifications reduced the irreversible reaction of oxygen functional groups with Na+.Simultaneously,a substantial number of closed pores with an average diameter of 1.22 nm were generated within the HC,offering an ideal environment for efficient Na+accommodation.These structural changes resulted in a remarkable improvement in the electro-chemical performance of the modified HC.The reversible specific capacity of the modified HC surged from 73.89 mAh-g-1 to an impressive 251.97 mAh-g-1 at a current density of 50 mA-g-1.Even at 400 mA-g-1,the reversible specific capacity increased significantly from 14.55 to 85.44 mAh-g-1.Hence,this study provides a novel perspective for designing tailored HC materials with the potential to develop high-performance SIBs.

Hard carbonSpark plasma sinteringSodium-ion batteriesClosed poresOxygen functional groups

Hao-Ming Xiao、Heng Zheng、Ping Yuan、Jun-Hui Luo、Lin-Lin Shen、Jie-Feng Tan、Xian-You Luo、De Li、Yong Chen

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Guangdong Key Laboratory for Hydrogen Energy Technologies,School of Materials Science and Hydrogen Energy,Foshan University,Foshan 528000,China

State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources,Hainan University,Haikou 570228,China

National Natural Science Foundation of ChinaGuangdong Province Key Discipline Construction ProjectInnovation Team of Universities of Guangdong ProvinceSpecial Fund for Science and Technology Innovation Cultivation of Guangdong University StudentsStudent Academic Fund of Foshan University

520620122021ZDJS1022022KCXTD030pdjh2023b0549xsjj202206kjb02

2024

10.1007/s12598-024-02716-7

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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