文章信息/Info

Title:

Influence of Heat Treatment on Electrochemical Lithium Storage Properties of Ti3C2Tx MXene

文章編號:

1674-3962(2023)05-0369-06

作者:

管斌; 劉鵬成; 林紫鋒

四川大學材料科學與工程學院，四川 成都 610065

Author(s):

GUAN Bin;  LIU Pengcheng;  LIN Zifeng

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China

關鍵詞:

熱處理; MXene; 熔鹽法制備; 官能團調控; 電化學儲鋰

Keywords:

heat treatment;  MXene;  molten salt synthesis;  functional group modulation;  electrochemical lithium storage

分類號:

TM912

DOI:

10.7502/j.issn.1674-3962.202208020

文獻標志碼:

A

摘要:

MXene材料是一類二維過渡金屬碳化物、氮化物或碳氮化合物，在能源、光學、生物、傳感和電磁屏蔽等領域具有重要應用前景。近期研究表明，路易斯酸熔融鹽法刻蝕制得的二維MXene材料具有優異的電化學儲鋰性能，且表面官能團對其儲鋰性能具有較大影響。為此，系統研究了熱處理對Ti3C2Tx MXene（T為Br及O）官能團及電化學儲鋰性能的影響。分析了不同熱處理溫度下Ti3C2Tx MXene的結構穩定性及官能團脫附行為，并對比了不同溫度處理下Ti3C2Tx MXene的電化學性能，闡明了不同官能團在儲鋰過程的作用。研究結果表明，熱處理可讓Br官能團發生脫附及產生TiO2，從而提升MXene材料的儲鋰性能；熱處理溫度大于300 ℃時，Ti3C2Tx MXene表面O官能團發生原位氧化，生成TiO2并貢獻額外儲鋰容量，但熱處理溫度為900 ℃時，Ti3C2Tx MXene結構被破壞，儲鋰容量大幅降低。在700 ℃熱處理Ti3C2Tx MXene樣品可獲得最高儲鋰容量，達241.9 mAh·g-1，相較未熱處理樣品容量提升32.2%。

Abstract:

MXene materials are a class of two-dimensional transition metal carbides, nitrides or carbon-nitrogen compounds with important application prospects in the fields of energy, optics, biology, sensing, and electromagnetic shielding. Recently, studies have shown that two-dimensional MXene materials prepared by Lewis acid molten salt etching have excellent electrochemical lithium-storage performance, and surface functional groups have a great influence on lithium storage performance. Therefore, this paper systematically studies the effect of heat treatment on the functional group of Ti3C2Tx (T is Br, O functional group) and the electrochemical lithium storage performance. The structural stability and functional group desorption behavior of Ti3C2Tx MXene at different heat treatment temperatures are analyzed, and the electrochemical properties of MXene treated at different temperatures are compared to clarify the role of different functional groups in the lithium storage process. The research results show that heat treatment can desorb the Br functional group, thereby improving the lithium storage performance; when the heat treatment temperature is greater than 300 ℃, the O functional group on the surface may react with Ti3C2Tx MXene to generate TiO2 and contribute additional lithium storage capacity, but when the heat treatment temperature is 900 ℃, the structure of Ti3C2Tx MXene is destroyed, and the lithium storage capacity is greatly reduced. Therefore, heat�瞭reating the Ti3C2Tx MXene sample at 700 ℃ can obtain the highest lithium storage capacity, reaching 241.9 mAh·g-1, which is a 32.2% increase in capacity compared with the untreated Ti3C2Tx MXene.