MXene derived TiS2 nanosheets for high-rate and long-life sodium-ion capacitors

被引:131
作者
Tang, Jiayong [1 ,2 ]
Huang, Xia [1 ,2 ]
Lin, Tongen [1 ,2 ]
Qiu, Tengfei [1 ,2 ]
Huang, Hengming [1 ,2 ]
Zhu, Xiaobo [1 ,2 ]
Gu, Qinfen [4 ]
Luo, Bin [1 ,2 ,3 ]
Wang, Lianzhou [1 ,2 ]
机构
[1] Univ Queensland, Nanomat Ctr, Sch Chem Engn, St Lucia, Qld 4072, Australia
[2] Univ Queensland, Australian Inst Bioengn & Nanotechnol, St Lucia, Qld 4072, Australia
[3] Qingdao Univ Sci & Technol, Coll Chem Engn, State Key Lab Base Ecochem Engn, Qingdao 266042, Peoples R China
[4] Australian Synchrotron ANSTO, 800 Blackburn Rd, Clayton, Vic 3168, Australia
关键词
Ultrathin nanosheets; Titanium disulfide; Sodium-ion hybrid capacitors; Energy storage; High rate performance; ELECTROCHEMICAL ENERGY-STORAGE; TITANIUM DISULFIDE; 2-DIMENSIONAL TIS2; PERFORMANCE; BATTERY; INSERTION; INTERCALATION; CARBON; NANOPARTICLES; ELECTRODE;
D O I
10.1016/j.ensm.2019.11.028
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
Sodium-ion capacitors (SICs) have received increasing attention because of the abundance of sodium resources and the combined feature of high energy and power density derived from the battery-type anode and capacitor-type cathode. The lack of suitable anode has been one of the major challenges for SICs. In this study, carbon coated TiS2 nanosheets are synthesized by in-situ conversion of polyvinyl pyrrolidone (PVP) modified Ti3C2Tx MXene (TiS2@Cpvp) and present outstanding electrochemical performance for high energy and high power Na-ion storage. The ultrathin nanostructure with large interlayer spaces provides easy Na+ access, leading to reduced entropic barrier for the reversible conversion and thus ultrafast rate capability and high reversibility. The unique structure exhibits a high discharge capacity of 448 mA h g(-1) at 0.1 A g(-1), superior rate capability with 387 mA h g(-1) even at 10 A g(-1) and a good cycling stability with 92.5% capacity retention after 5000 cycles. Combined with an activated carbon (AC) cathode, the TiS2@C-pvp//AC SICs delivers high energy density (101.7 Wh kg(-1)) and power density (200 W kg(-1)), which is among the best performances of TiS2-based SICs reported so far. This study sheds light on the development of ultrathin metal sulfides materials for high performance SICs and also expands the application of 2D hybrid materials in energy storage field.
引用
收藏
页码:550 / 559
页数:10
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