High-concentration ether-based electrolyte boosts the electrochemical performance of SnS2-reduced graphene oxide for K-ion batteries
High-concentration ether-based electrolyte boosts the electrochemical performance of SnS2-reduced graphene oxide for K-ion batteries
复制标题
高浓度醚基电解质提高了K离子电池用SnS2还原氧化石墨烯的电化学性能
DOI：
10.1039/c9ta06418d
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发表时间：
2019
影响因子：
11.9
通讯作者：
Mai Wenjie
中科院分区：
文献类型：
--
作者：
Xie Junpeng;Zhu Yongqian;Zhuang Ning;Li Xiaodan;Yuan Xinran;Li Jinliang;Hong Guo;Mai Wenjie
为了满足人们对储能系统的迫切需求，具有低成本和相当电化学性能的K离子电池（KIB）已成为锂离子电池最有前途的替代品之一。在这项研究中，纳米SnS 2锚定到还原氧化石墨烯（SnS 2-RGO）使用醚基电解质进行了研究。在100 mA g−1下，50次循环后获得436 mA h g− 1的可逆比容量，以及在500 mA g−1下，150次循环后获得311 mA h g− 1的可逆比容量，这比使用酯基电解质的那些要好得多。有趣的是，发现高浓度的醚基电解质可以显着抑制KxS针的生长，这可能是由于高浓度的K离子引起的静电屏蔽效应。这一发现对于K离子存储应该是重要的，并且可以从电解质的角度阐明更好的KIB的设计。此外，我们还利用非原位XRD图谱揭示了SnS 2-RGO与高浓度醚基电解质的电化学反应过程和反应中间产物。
To meet the urgent demand for energy storage systems, K-ion batteries (KIBs), with low cost and comparable electrochemical performance, have become one of the most promising alternatives to Li-ion batteries. In this study, nanocrystalline SnS2 anchored to reduced graphene oxide (SnS2–RGO) is investigated using ether-based electrolytes. A reversible specific capacity of 436 mA h g−1 at 100 mA g−1 after 50 cycles was obtained, as well as the reversible specific capacity of 311 mA h g−1 at 500 mA g−1 after 150 cycles, which are much better than those using ester-based electrolytes. Interestingly, it was found that high-concentration ether-based electrolytes can remarkably suppress the growth of KxS needles, which is probably due to the electrostatic shielding effect induced by the high concentration of K ions. This discovery should be important for K-ion storage and could shed light on the design of better KIBs from the perspective of electrolytes. Furthermore, we also utilized ex situ XRD patterns to reveal the electrochemical reaction process and reaction intermediate products of SnS2–RGO with high-concentration ether-based electrolytes.