Electrochemical Insight into the Sodium-Ion Storage Mechanism on a Hard Carbon Anode

被引：36
作者：
Chen, Xiaoyang [1 ]
Fang, Youlong [1 ]
Tian, Jiyu [1 ]
Lu, Haiyan [1 ]
Ai, Xinping [1 ]
Yang, Hanxi [1 ]
Cao, Yuliang [1 ]
机构：
[1] Wuhan Univ, Coll Chem & Mol Sci, Engn Res Ctr Organosilicon Cpds & Mat, Minist Educ, Wuhan 430072, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 16期
关键词：
sodium-ion batteries; anode; hard carbon; reaction mechanism; intercalation; POTENTIOSTATIC INTERMITTENT TITRATION; LITHIUM INSERTION; CATHODE MATERIALS; HIGH-CAPACITY; LOW-COST; PERFORMANCE; ELECTRODES; GRAPHITE; GROWTH; METAL;
D O I：
10.1021/acsami.1c03748
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Hard carbon (HC) has been actively investigated as a high-capacity and low-cost anode material for sodium-ion batteries (SIBs); however, its sodium-storage mechanism has remained controversial, which imposes great difficulties in the design and construction of better microstructured HC materials. To obtain a deeper understanding of the Na-storage mechanism, we comparatively investigated electrochemical behaviors of HC and graphite for Na- and Li-storage reactions. The experimental results reveal that the Na-storage reaction on HC at a low-potential plateau proceeds in a manner similar to the Li+-insertion reaction on graphite but very differently from the Li+-storage process on HC, suggesting that the Na-storage mechanism of HC at a low-voltage plateau operates through the Na+ intercalation into the graphitic layers for the formation of sodium-graphite intercalation compounds (Na-GICs) and is consistent with the "adsorption-intercalation" mechanism. Our work might provide new insight for designing better HC materials of high-energy density SIBs.
引用
收藏
页码：18914 / 18922
页数：9
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