Submicron Ti2CTx MXene particulates as high-rate intercalation anode materials for Li-ion batteries

被引:11
|
作者
Cui, Cong [1 ,2 ]
Dai, Ruqiao [1 ,2 ]
Zhang, Chao [1 ]
Fan, Bingbing [3 ]
Wang, Xiaohui [1 ]
机构
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[3] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
基金
中国国家自然科学基金;
关键词
MOLTEN-SALT; ENERGY-STORAGE; MAX PHASES; HIGH-CAPACITY; NB2CTX MXENE; V2C MXENE; AB-INITIO; METAL; PERFORMANCE; TITANIUM;
D O I
10.1039/d2ta03050k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ever increasing demands for portable electronics and electric vehicles critically require high-rate Li-ion batteries (LIBs) whose performance fundamentally depends on electrode materials. However, currently commercialized anode materials including graphite and silicon fail to fulfill the higher requirement because of their intrinsically inferior rate capability. Here, we report submicron Ti2CTx (s-Ti2CTx) MXene particulates as a high-rate intercalation anode material for LIBs. The particulates are derived from the layered ternary Ti2AlC MAX phase that is readily fabricated by the molten salt method. The synthesized s-Ti2CTx particulates have a high specific capacity of similar to 155 mA h g(-1) even at a high current density of 10 A g(-1), exhibiting high rate capability. Specifically, the particulates, with a nominal chemical formula of Ti2CTxLi1.4, can release similar to 57% of their revisable capacity (similar to 270 mA h g(-1)) in 56 s and they exhibit good capacity retention during 1000 cycles. As evidenced by comprehensive electrochemical characterization studies, a reduction in the lateral size of MXene particulates remarkably facilitates an interlayer (de)lithiation process compared with their large counterparts. The s-Ti2CTx also offers an opportunity to fabricate flexible electrodes with outstanding rate performance and cyclability. Our results provide a platform for studying MXene-based intercalation anode materials with desired electrochemical performance for high-rate LIBs.
引用
收藏
页码:15474 / 15484
页数:11
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