Interwoven NiCo2O4 Nanosheet/Carbon Nanotube Composites as Highly Efficient Lithium−Sulfur Cathode Hosts,ChemElectroChem

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Interwoven NiCo2O4 Nanosheet/Carbon Nanotube Composites as Highly Efficient Lithium−Sulfur Cathode Hosts
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-09-13 , DOI: 10.1002/celc.201700643
Dengji Xiao _{1,

2} , Huifang Zhang _{1,

2} , Chenmeng Chen ₁ , Yaodong Liu ₁ , Shuxia Yuan ₁ , Chunxiang Lu ₃

Affiliation

Lithium−sulfur (Li−S) batteries are one of the most promising candidates for the next generation of rechargeable battery systems, because of their high energy density and cost effectiveness. But, their commercialized applications are hindered by fast capacity fading and poor cycling stability. In this work, sulfur hosts based on interwoven NiCo₂O₄ nanosheet/carbon nanotube composites are designed and synthesized by using a solvothermal reaction and subsequent annealing. In this unique material architecture, the carbon nanotubes construct a porous conductive network across the NiCo₂O₄ nanosheets to provide fast electron paths. In addition, the NiCo₂O₄ nanosheets can chemically bind polysulfides to restrain their diffusion into electrolyte. As a result, the Li−S batteries based on this sulfur host exhibit high specific capacity, excellent cycling stability, and good rate capability. Reversible specific capacities of 1311 and 575 mA h g⁻¹ are achieved at rates of 0.1 and 2 C, respectively, together with an excellent cycling stability of 0.038 % capacity decay per cycle over 1200 cycles at 0.5 C.

中文翻译：

交织的NiCo2O4纳米片/碳纳米管复合材料作为高效锂硫阴极主体

锂硫（Li-S）电池由于其高能量密度和成本效益，是下一代可再充电电池系统最有希望的候选者之一。但是，它们的商业化应用由于快速的容量衰减和较差的循环稳定性而受到阻碍。在这项工作中，通过溶剂热反应和随后的退火来设计和合成基于交织的NiCo ₂ O ₄纳米片/碳纳米管复合材料的硫主体。在这种独特的材料结构中，碳纳米管跨NiCo ₂ O ₄纳米片构建了一个多孔导电网络，以提供快速的电子路径。另外，NiCo ₂ O ₄纳米片可以化学键合多硫化物以限制其扩散到电解质中。结果，基于该硫基质的Li-S电池表现出高的比容量，优异的循环稳定性和良好的倍率能力。分别在0.1和2 C的速率下可实现1311和575 mA h g ^-1的可逆比容量，并具有出色的循环稳定性，在0.5 C的1200个循环中，每个循环的容量衰减为0.038％。

更新日期：2017-09-13

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