首页|New insights into the effect of hard carbons microstructure on the diffusion of sodium ions into closed pores

New insights into the effect of hard carbons microstructure on the diffusion of sodium ions into closed pores

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Closed pores formed in hard carbons play an essential role in sodium storage at plateau region.How-ever,the effect of different structural features on the diffusion of sodium ions into closed pores remains unclear.Herein,a precursor reconstruction strategy is conducted to regulate carbon microstructures in-cluding interlayer spacing,defect concentration,and closed pore volume by changing the ratio of aro-matic and polysaccharide components.Aromatic structure parts tend to develop disordered carbons with fewer defects,larger interlayer spacing,and smaller closed pore volume,while polysaccharide compo-nents prefer to form disordered carbons with more defects,smaller interlayer spacing,and larger closed pore volume.Through the correlation analysis of microstructure features and the sodium storage capac-ity below 0.1 V.It finds that the intercalation capacity is proportional to the ratio of pseudo-graphitic domains,whereas the pore filling capacity appeared at lower potential gradually decreases with the in-creasing defect concentration due to homo-ionic repulsion effect,without linear correlation with short-range microcrystalline and closed pore volume.The optimized sample with suitable interlayer spacing and defect concentration exhibits a high plateau capacity of 241.7 mAh/g.This work provides insights into the exploitation of closed pore sodium storage performance.

Precursor reconstructionHard carbonsStructural featuresClosed pore fillingSodium-ion batteries

Mingxin Song、Lijing Xie、Fangyuan Su、Zonglin Yi、Quangui Guo、Cheng-Meng Chen

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CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China

University of Chinese Academy of Sciences,Beijing 100049,China

Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

National Key Research and Development(R&D)Program of ChinaYouth Innovation Promotion Association of CASInnovation Fund for Basic Research Program supported by ICC CASInnovation Fund for Basic Research Program supported by ICC CAS

2020YFB15058032019178SCJC-XCL-2023-10SCJC-XCL-2023-13

2024

10.1016/j.cclet.2023.109266

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)
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