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Asymmetric-Layered Tin Thiophosphate: An Emerging 2D Ternary Anode for High-Performance Sodium Ion Full Cell
ACS Nano ( IF 15.8 ) Pub Date : 2018-12-03 00:00:00 , DOI: 10.1021/acsnano.8b08229
Qinghua Liang 1 , Yun Zheng 2 , Chengfeng Du 1 , Yubo Luo 1 , Jin Zhao 1 , Hao Ren 1 , Jianwei Xu 2 , Qingyu Yan 1
Affiliation  

The emerging sodium ion batteries (SIBs) are believed to be prospective substitutes for lithium ion batteries (LIBs) because of the wide distribution of sodium resources. However, to compensate for the sluggish reaction kinetics and higher intrinsic potential of Na+ compared to Li+, cost-effective, reliable, and sustainable electrode materials must be explored for practical applications. Herein, 2D ternary tin thiophosphate (SnP2S6) nanosheets (∼10 nm thickness) grown on graphene (denoted as SPS/G hybrid) are demonstrated as intriguing anodes for SIBs. The asymmetric-layered structure and ternary composition enable the SPS/G hybrid with a high reversible capacity (1230 mAh g–1 at 50 mA g–1), superior rate capability (200 mAh g–1 at 15 A g–1), and an exceptional capacity retention of 76% after 1000 cycles at 2.0 A g–1. More importantly, a prototype sodium-ion full cell constructed by pairing with the Na3V2O2(PO4)3F cathode affords a high capacity of 470 mAh g–1 at 30 mA g–1 (on the basis of anode weight) and good cyclic capacity of 360 mAh g–1 at 150 mA g–1. Such 2D ternary chalcogenides with low-cost elements are promising materials for superior SIBs.

中文翻译:

不对称层状硫代磷酸锡:高性能钠离子全电池的新兴二维三元阳极。

由于钠资源的广泛分布,新兴的钠离子电池(SIB)被认为是锂离子电池(LIB)的潜在替代品。但是,为了补偿Na +的反应动力学慢和Na +较Li +更高的固有电势,必须为实际应用探索具有成本效益,可靠且可持续的电极材料。本文中,在石墨烯(表示为SPS / G杂化物)上生长的2D三元硫代磷酸锡(SnP 2 S 6)纳米片(约10 nm厚)被证明是SIB的引人入胜的阳极。的非对称层结构和三元成分使具有高可逆容量(1230毫安克SPS / G混合-1在50mA克-1),优异的速率能力(在15 A g –1时为200 mAh g –1),以及在2.0 A g –1下进行1000次循环后的卓越容量保持率达76%。更重要的是,与Na 3 V 2 O 2(PO 43 F阴极配对构建的钠离子全电池原型在30 mA g –1时(基于阳极)可提供470 mAh g –1的高容量。重量)和150 mA g –1时360 mAh g –1的良好循环容量。这种具有低成本元素的2D三元硫属元素化物是用于高级SIB的有前途的材料。
更新日期:2018-12-03
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