Dual-Carbon Confined SnP2O7 with Enhanced Pseudocapacitances for Improved Li/Na-Ion Batteries

被引:11
作者
Guo, Xinzhu [1 ]
Wan, Zhengwei [1 ]
Wei, Di [1 ]
Zeng, Xiaomin [1 ]
Li, Zeheng [1 ]
Jiang, Wei [1 ]
Wang, Hongxun [1 ]
Ling, Min [1 ]
Li, Hui [2 ]
Liang, Chengdu [1 ]
机构
[1] Zhejiang Univ, Coll Chem & Biol Engn, Zhejiang Prov Key Lab Adv Chem Engn Manufacture T, Hangzhou 310027, Peoples R China
[2] Jiangsu Univ Sci & Technol, Coll Met & Mat Engn, Zhangjiagang 215600, Peoples R China
关键词
in-situ synthesis; dual-carbon; pseudocapacitances; phytic acid; lithium; sodium-ion batteries; ANODE MATERIALS; LITHIUM; GROWTH;
D O I
10.1002/celc.202100793
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Tin-based materials have obtained much attention in lithium-ion batteries (LIBs) due to high specific capacity. However, the large volume change and poor electroconductivity hinder their further practical application. Herein, a C18N12 (CN)-wired amorphous carbon coated pyrophosphate tin (SnP2O7@C) ultrafine nanoparticles composite (SnP2O7@C/CN) is prepared by solvothermal-calcination with phytic acid (PA) as phosphorus and carbon sources simultaneously. Ultrafine-nanocrystallization and dual-carbon doping enhances the pseudocapacitance of SnP2O7@C/CN and thus, exhibit good electrochemical performance and high lithium/sodium storage efficiency. As anode of LIBs, the SnP2O7@C/CN exhibits a superior reversible capacity of 557.3 mAh/g after 100 cycles at a current density of 0.2 A/g and a conspicuous cyclability of 352.3 mAh/g after 800 cycles at 1 A/g. For sodium-ion batteries (SIBs), the stable discharge capacity of SnP2O7@C/CN electrode is 91.5 mAh/g after 800 cycles at a high current density of 2 A/g. This strategy can increase active sites, provide large electrolyte/electrode contact area, and improve electroconductivity. Moreover, SnP2O7@C/CN electrode provides a buffer space for structural strains caused by volume changes during charging and discharging.
引用
收藏
页码:2708 / 2714
页数:7
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