Facile synthesis of Co3-xMnxO4/C nanocages as an efficient sulfur host for lithium-sulfur batteries with enhanced rate performance.,Dalton Transactions

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Facile synthesis of Co3-xMnxO4/C nanocages as an efficient sulfur host for lithium-sulfur batteries with enhanced rate performance.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-06-02 , DOI: 10.1039/d0dt01620a
Zexian Zhang ₁ , Shiyuan Zhou ₁ , Tao Mei ₁ , Yanzhuo Gou ₁ , Fanxuan Xie ₁ , Chengcheng Liu ₁ , Xianbao Wang ₁

Affiliation

Capacity reduction mainly caused by the shuttle effect and low conductivity restricts the commercial application of lithium–sulfur batteries (LSBs). Herein, we developed a method to overcome these two obstacles synchronously by designing nitrogenous carbon decorated hollow Co_3−xMn_xO₄/C nanocages as hosts of sulfur. These hosts were derived from manganese doped ZIF-67 by a facile sintering method, which provided polar surface to anchor lithium polysulfides and considerable electronic conductivity. The polar material Co_3−xMn_xO₄ and special hollow frame contribute to efficient synergistic sulfur-fixation, resulting in great cycling stabilities. The manganese elements ensure an efficient conversion among LSPs. At the same time, N-doped carbon provides excellent electrical conductivity, thereby leading to splendid rate performances. Thus, a battery with great stability and high capacity could be achieved. As a result, Co_3−xMn_xO₄/C/S with 66 wt% sulfur content delivered a high initial capacity of 1082 mA h g⁻¹ at 1C, together with a slow average capacity decay of 0.056% per cycle at 10C over 500 cycles. When the average sulfur loading is 1.3 mg cm⁻², a capacity of 628 mA h g⁻¹ can be maintained at 5C after 500 cycles.

中文翻译：

方便地合成Co3-xMnxO4 / C纳米笼，作为锂硫电池的高效硫载体，具有增强的速率性能。

容量降低主要是由穿梭效应和低电导率引起的，这限制了锂硫电池（LSB）的商业应用。在这里，我们开发了一种通过设计含氮碳装饰的空心Co _{3− x} Mn _x O ₄ / C纳米笼作为硫的主体，同时克服这两个障碍的方法。这些基质是通过便捷的烧结方法从掺锰的ZIF-67中获得的，该方法可提供极性表面来锚定多硫化锂并具有可观的电子导电性。极性材料Co _{3− x} Mn _x O ₄特殊的空心框架有助于高效地协同固定硫，从而实现出色的循环稳定性。锰元素可确保LSP之间的有效转换。同时，N掺杂碳提供了出色的导电性，从而导致出色的速率性能。因此，可以实现具有高稳定性和高容量的电池。结果，硫含量为66％（重量）的Co _{3- x} Mn _x O ₄ / C / S在1C时提供了1082 mA hg ^-1的高初始容量，在10C时每个循环的平均容量衰减缓慢为0.056％超过500个周期。当平均硫负载为1.3 mg cm ^-2时，容量为628 mA hg ^-1 500次循环后可保持在5C。

更新日期：2020-06-29

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