文章信息/Info

Title:

Study on the Performance of TiO2/C Hybrids as Anode Materials of Sodium-Ion Batteries

文章編號(hào):

1674-3962(2021)04-0301-07

作者:

徐夢(mèng)1;  劉博文1; 吳昱2; 劉慶雷1

（1．上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200240）（2．中國(guó)人民解放軍軍事科學(xué)院防化研究院，北京 102205）

Author(s):

XU Meng1; LIU Bowen1; WU Yu2; LIU Qinglei1

(1.The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China) (2.Research Institute of Chemical Defense, Academy of Military Sciences PLA China, Beijing 102205, China)

關(guān)鍵詞:

海藻酸鈉; 自主交聯(lián); TiO2/C復(fù)合材料; 多孔結(jié)構(gòu); 鈉離子電池

Keywords:

alginate;  self-crosslinking;  TiO2/C hybrids;  porous structure;  sodium-ion battery

分類號(hào):

TB332；TM912

DOI:

10.7502/j.issn.1674-3962.201910023

文獻(xiàn)標(biāo)志碼:

A

摘要:

近年來(lái)，TiO2作為鈉離子電池（NIB）負(fù)極材料，因其低成本和高穩(wěn)定性等優(yōu)勢(shì)受到廣泛關(guān)注。但受TiO2本征電子導(dǎo)電性的固有限制，使得TiO2作為NIB負(fù)極材料導(dǎo)電性較差，導(dǎo)致其容量和倍率等性能不理想。利用海藻酸鈉與金屬離子自主交聯(lián)反應(yīng)的特性，將反應(yīng)產(chǎn)物在最佳溫度下進(jìn)行簡(jiǎn)單碳化，制備了具有分級(jí)多孔結(jié)構(gòu)的TiO2/C復(fù)合材料，其中TiO2納米顆粒均勻地分布在多孔互連的碳基體中，該結(jié)構(gòu)提升了復(fù)合材料導(dǎo)電性的同時(shí)擴(kuò)展了鈉離子反應(yīng)的附著位點(diǎn)。將TiO2/C復(fù)合材料用于NIB負(fù)極材料，在 100 mA·g-1的電流密度下循環(huán)300圈后，電池可逆比容量維持在180.4 mAh·g-1；進(jìn)一步，在更高的1000 mA·g-1電流密度下經(jīng)過(guò)1000次循環(huán)后，電池可逆比容量維持在102.3 mAh·g-1，充分顯示出TiO2/C復(fù)合材料作為NIB負(fù)極材料的應(yīng)用潛能。

Abstract:

In recent years, titanium dioxide (TiO2) has attracted a lot of attention as the active anode material in sodium rechargeable battery (NIB) due to its low cost and stability. However, in practice the intrinsically slow transport kinetics of electrons in TiO2 prevent optimal electrochemical performance. Here, we prepared a hierarchical porous TiO2/C hybrid with oxygen vacancies through a simple carbonization of a Na+ controlled Ti-alginate self-crosslinking for the high-performance anode of sodium-ion batteries. Owing to the combination of hierarchical porous carbon matrix and the TiO2 nano-particles, the TiO2/C provided a capacity of 180.4 mAh·g-1 after 300 cycles at a current density of 100 mA·g-1, and delivered an excellent reversible capacity of 102.3 mAh·g-1 after 1000 cycles even at a higher current density of 1000 mA·g-1. Such good electrochemical performance has demonstrated the great potential of TiO2/C hybrids used as anodes for NIB.