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Boosting the lithium-ion and sodium-ion storage performances of pyrite by regulating the energy barrier of ion transport.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-11 , DOI: 10.1039/d0nr02966a Jie Wang 1 , Jinwen Qin , Yan Jiang , Xin Wang , Minhua Cao
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-11 , DOI: 10.1039/d0nr02966a Jie Wang 1 , Jinwen Qin , Yan Jiang , Xin Wang , Minhua Cao
Affiliation
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Pyrite (FeS2) is a functional material of great importance for lithium/sodium ion batteries (LIBs/SIBs), but its sluggish dynamics greatly hinder its high performance. Here, we demonstrate an effective strategy of regulating the energy barrier of ion transport to significantly enhance the sluggish dynamics of FeS2 by Co doping. Compared to pristine FeS2, a series of Co-doped FeS2 shows enhanced alkali metal ion storage performance and most typically, the optimized Fe0.7Co0.3S2 sample displays high reversible capacities, of 1170 mA h g−1 for LIBs and 650 mA h g−1 for SIBs at a current density of 0.1 A g−1 as well as super long-life cycling stability for SIBs (1200 cycles at 5 A g−1). The evidently enhanced performances of Fe0.7Co0.3S2 for LIBs/SIBs can be attributed to its significantly decreased activation energy of ion transport, thus leading to greatly accelerated ion transport dynamics. Furthermore, galvanostatic intermittent titration technique (GITT) experiments also support this important regulation effect of Co doping on the ion transport dynamics of FeS2. The excellent ion transport dynamics induce a strong pseudo-capacitance behavior in both SIBs and LIBs, and their pseudo-capacitance contributions are more than 90% at 1.0 mV s−1. This work provides a new perspective to improve the alkali metal ion storage performance by optimizing the ion transport dynamics.
中文翻译：
通过调节离子传输的能垒，提高黄铁矿的锂离子和钠离子存储性能。
黄铁矿（FeS 2）是锂/钠离子电池（LIBs / SIBs）极为重要的功能材料，但其缓慢的动力极大地阻碍了其高性能。在这里，我们展示了一种有效的策略来调节离子迁移的能垒，以通过Co掺杂显着增强FeS 2的缓慢动力学。与原始FeS 2相比，一系列的Co掺杂FeS 2显示出增强的碱金属离子存储性能，最典型的是，优化的Fe 0.7 Co 0.3 S 2样品显示出高的可逆容量，对于LIB和650 mA分别为1170 mA hg -1对于SIB的hg -1，电流密度为0.1 A g-1以及SIB的超长寿命循环稳定性（在5 A g -1时为1200个循环）。Fe 0.7 Co 0.3 S 2对于LIBs / SIBs的明显增强的性能可归因于其大大降低的离子迁移活化能，从而大大加速了离子迁移动力学。此外，恒电流间歇滴定技术（GITT）实验也支持了Co掺杂对FeS 2离子迁移动力学的重要调节作用。出色的离子迁移动力学在SIB和LIB中均诱导了很强的伪电容行为，并且它们在1.0 mV s -1时的伪电容贡献超过90％。这项工作为通过优化离子传输动力学来改善碱金属离子存储性能提供了新的视角。
更新日期：2020-07-02
中文翻译：
通过调节离子传输的能垒，提高黄铁矿的锂离子和钠离子存储性能。
黄铁矿（FeS 2）是锂/钠离子电池（LIBs / SIBs）极为重要的功能材料，但其缓慢的动力极大地阻碍了其高性能。在这里，我们展示了一种有效的策略来调节离子迁移的能垒，以通过Co掺杂显着增强FeS 2的缓慢动力学。与原始FeS 2相比，一系列的Co掺杂FeS 2显示出增强的碱金属离子存储性能，最典型的是，优化的Fe 0.7 Co 0.3 S 2样品显示出高的可逆容量，对于LIB和650 mA分别为1170 mA hg -1对于SIB的hg -1，电流密度为0.1 A g-1以及SIB的超长寿命循环稳定性（在5 A g -1时为1200个循环）。Fe 0.7 Co 0.3 S 2对于LIBs / SIBs的明显增强的性能可归因于其大大降低的离子迁移活化能，从而大大加速了离子迁移动力学。此外，恒电流间歇滴定技术（GITT）实验也支持了Co掺杂对FeS 2离子迁移动力学的重要调节作用。出色的离子迁移动力学在SIB和LIB中均诱导了很强的伪电容行为，并且它们在1.0 mV s -1时的伪电容贡献超过90％。这项工作为通过优化离子传输动力学来改善碱金属离子存储性能提供了新的视角。
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