Uniform Mesoporous MnO2 Nanospheres as a Surface Chemical Adsorption and Physical Confinement Polysulfide Mediator for Lithium-Sulfur Batteries
Uniform Mesoporous MnO2 Nanospheres as a Surface Chemical Adsorption and Physical Confinement Polysulfide Mediator for Lithium-Sulfur Batteries
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均匀介孔 MnO2 纳米球作为锂硫电池表面化学吸附和物理限制多硫化物介体
DOI：
10.1021/acsami.8b20044
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发表时间：
2019-03-20
影响因子：
9.5
通讯作者：
Xu, Yunhua
中科院分区：
文献类型：
--
作者：
Tu, Shuibin;Zhao, Xinxin;Xu, Yunhua
锂硫电池的实际应用受到循环稳定性差和库仑效率差的阻碍，这是由于可溶性多硫化物中间体的臭名昭著的穿梭。本文采用简便的自组装和室温反应法制备了均匀介孔二氧化锰纳米球。作为硫阴极的硫载体，二氧化锰的多用途结构不仅提供了强大的化学吸附，将多硫中间体锚定在大的极性表面积上，而且通过物理约束将它们限制在纳米孔内。该介孔mno2稳定硫阴极具有1349.3 mA h g（-1）的高初始可逆容量和0.073%的容量衰减率。此外，在硫含量为80.7%时，可获得2.5 mA h cm（-2）的可逆面积容量和稳定的循环性能。我们的工作提供了一种简便的方法来构建高性能锂硫电池的高效硫阴极。
The actual implementation of lithium-sulfur batteries is hindered by inferior cyclic stability and poor coulombic efficiency stemming from the notorious shuttling of soluble polysulfide intermediates. Herein, uniform mesoporous MnO2 nanospheres were prepared using a facile self-assembly and room-temperature reaction method. As a sulfur carrier of sulfur cathodes, the versatile architecture of MnO2 not only provides powerful chemical adsorption to anchor polysulfide intermediates on the large polar surface area but also restrains them within the nanopores by physical confinement. The mesoporous MnO2-stabilized sulfur cathode demonstrates a high initial reversible capacity of 1349.3 mA h g(-1) and a capacity fading rate of 0.073% at 1.0 C over 500 cycles. Furthermore, a reversible areal capacity of 2.5 mA h cm(-2) was achieved with stable cycling performance at a sulfur content of 80.7%. Our work offers a facile method to build efficient sulfur cathodes for high performance lithium-sulfur batteries.