Stringed "tube on cube'' nanohybrids as compact cathode matrix for high-loading and lean-electrolyte lithium-sulfur batteries
Stringed "tube on cube'' nanohybrids as compact cathode matrix for high-loading and lean-electrolyte lithium-sulfur batteries
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立方体上的弦管纳米混合材料作为高负载和贫电解质锂硫电池的紧凑阴极基质
DOI：
10.1039/c8ee01377b
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发表时间：
2018-09-01
影响因子：
32.5
通讯作者：
Chen, Zhongwei
中科院分区：
文献类型：
--
作者：
Li, Gaoran;Lei, Wen;Chen, Zhongwei
正极主体材料的合理设计对于实现高效硫电化学以及提高锂硫电池的能量密度具有重要意义。在此，我们开发了一种具有三元分层结构的弦管立方体纳米混合物（CPZC），其包含纤维状碳骨架，高度多孔的碳立方体填料和丰富的CNT触角作为硫电极的高级基质。所开发的CPZC具有优异的导电性、丰富的活性界面和对多硫化物的强限制，因此能够显著加快硫氧化还原动力学并提高电池的耐久性。所制备的硫电极具有高达10 C的倍率性能和超过2000次的循环性能，更重要的是，在高硫负载和节省电解液的条件下具有优异的性能，在系统水平上具有348.8 W h kg（-1）和327.6 W h L-1的高能量密度，这显示了其在促进Li-S电池实际应用方面的潜力。
The rational design of cathode host materials is significant in fulfilling high-efficiency sulfur electrochemistry as well as boosting the energy density of lithium-sulfur (Li-S) batteries. Herein, we develop a stringed tube on cube nanohybrid (CPZC) with a ternary hierarchical architecture, which contains a fibrous carbon skeleton, highly porous carbon cube filler, and abundant CNT tentacles as an advanced matrix for sulfur electrodes. The as-developed CPZC delivers excellent conductivity, abundant active interfaces, and strong confinement to polysulfide, and thus is capable of significantly expediting the sulfur redox kinetics and promoting battery durability. The fabricated sulfur electrode achieves a superb rate capability up to 10C, outstanding cyclability over 2000 cycles, and more importantly, excellent performance under high a sulfur loading and sparing electrolyte with a high energy density of 348.8 W h kg(-1) and 327.6 W h L-1 at the system level, which reveals its potential in promoting the practical application of Li-S batteries.