Insights on the mechanism of Na-ion storage in expanded graphite anode

• 作者: Xiaodan Li Zhibin Liu Jinliang Li Hang Lei Wenchen Zhuo Wei Qin Xiang Cai Kwun Nam Hui Likun Pan Wenjie Mai
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（2）
• 页码范围: 56-62
• 页数: 7页
• 语种: 英文

摘要

Currently,Na-ion battery (NIB) has become one of the most potential alternatives for Li-ion batteries due to the safety and low cost.As a promising anode for Na-ion storage,expanded graphite has attracted considerable attention.However,the sodiation-desodiation process is still unclear.In our work,we obtain expanded graphite through slight modified Hummer's method and subsequent thermal treatment,which exhibits excellent cycling stability.Even at a high current density of 1 A g-1,our expanded graphite still remains a high reversible capacity of 100 mA h g-1 after 2600 cycles.Furthermore,we also investigate the electrochemical mechanism of our expanded graphite for Na-ion storage by operando Raman technique,which illuminate the electrochemical reaction during different sodiation-desodiation processes.