Rational design of multi-channel continuous electronic/ionic conductive networks for room temperature vanadium tetrasulfide-based all-solid-state lithium-sulfur batteries
Rational design of multi-channel continuous electronic/ionic conductive networks for room temperature vanadium tetrasulfide-based all-solid-state lithium-sulfur batteries
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室温四硫化钒基全固态锂硫电池多通道连续电子/离子导电网络的合理设计
DOI：
10.1016/j.nanoen.2019.01.004
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发表时间：
2019-03
期刊：
影响因子：
17.6
通讯作者：
Xiayin Yao
中科院分区：
文献类型：
--
作者：
Qiang Zhang;Hongli Wan;Gaozhan liu;Zhaoguang Ding;Jean Pierre Mwizerwa;Xiayin Yao
全固态锂硫电池可以通过取代有机液体电解质和消除多硫化物穿梭来完全克服安全问题和快速容量衰减。然而，硫的绝缘性质和大的体积变化仍然抑制全固态锂硫电池实现良好的电化学性能。本文采用简单的一锅水热法成功合成了直链化合物四硫化钒（VS 4）锚定的还原氧化石墨烯（rGO-VS 4）纳米复合材料。此外，采用液相沉积法制备了10% rGO-VS 4@Li 7 P 3S 11纳米复合材料，该复合材料具有多通道连续的电子/离子导电网络结构，可作为全固态锂电池硫阴极的替代材料.通常，Li/75%Li2S-24%P2S5-1%P2O5/Li 10 GeP 2S 12/10% rGO-VS 4 @ Li 7 P3 S11全固态锂硫电池在100次循环后在0.1 A g− 1下提供611 mAh g− 1的高可逆容量，基于硫的质量，对应于853 mAh g− 1。即使在1.5 V至3.0 V之间以0.5 A g− 1循环500次后，它仍显示出基于硫含量的333 mAh g− 1放电比容量，具有优异的循环稳定性。其优异的倍率性能和循环性能归因于多通道连续的电子/离子导电网络和改善的结构稳定性。此外，通过原位表征技术研究了10% rGO-VS_4@Li_7 P_3S_（11）在全固态锂电池中的电化学反应动力学、容量贡献及反应机理.
All-solid-state lithium-sulfur batteries can completely overcome safety issues and fast capacity fading by substitution of organic liquid electrolytes and eliminating polysulfide shuttle. However, the insulating nature of sulfur and large volume change still inhibit all-solid-state lithium-sulfur batteries from achieving favorable electrochemical performances. In this work, linear-chain compound vanadium tetrasulfide (VS4) anchored reduced graphene oxide (rGO-VS4) nanocomposites are successfully synthesizedviaa simple one-pot hydrothermal method. Furthermore, 10%rGO-VS4@Li7P3S11nanocomposites with multi-channel continuous electronic/ionic conductive network are prepared by a facile liquid-phase deposition reaction and further employed as an alternative material for sulfur cathode in all-solid-state lithium batteries. Typically, Li/75%Li2S-24%P2S5-1%P2O5/Li10GeP2S12/10%rGO-VS4@Li7P3S11all-solid-state lithium-sulfur batteries deliver high reversible capacity of 611 mAh g−1at 0.1 A g−1after 100 cycles, corresponding to 853 mAh g−1based on the mass of sulfur. Even after being cycled at 0.5 A g−1between 1.5 and 3.0 V for 500 cycles, it still shows the discharge specific capacity of 333 mAh g−1based on sulfur content with excellent cycling stability. The excellent rate capability and cycle performances can be ascribed to the multi-channel continuous electronic/ionic conductive networks and the improved structural stability. In addition, the electrochemical reaction kinetics and capacity contributions as well as reaction mechanisms of 10%rGO-VS4@Li7P3S11in all-solid-state lithium batteries were revealed byex-situcharacterization techniques.
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影响因子：
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作者：
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