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An Efficient Separator with Low Li‐Ion Diffusion Energy Barrier Resolving Feeble Conductivity for Practical Lithium–Sulfur Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-09-05 , DOI: 10.1002/aenm.201901800 Xiaoxue Lv 1 , Tianyu Lei 1 , Bojun Wang 2 , Wei Chen 1 , Yu Jiao 3 , Yin Hu 1 , Yichao Yan 1 , Jianwen Huang 1 , Junwei Chu 1 , Chaoyi Yan 1 , Chunyang Wu 1 , Jianwei Wang 2 , Xiaobin Niu 2 , Jie Xiong 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2019-09-05 , DOI: 10.1002/aenm.201901800 Xiaoxue Lv 1 , Tianyu Lei 1 , Bojun Wang 2 , Wei Chen 1 , Yu Jiao 3 , Yin Hu 1 , Yichao Yan 1 , Jianwen Huang 1 , Junwei Chu 1 , Chaoyi Yan 1 , Chunyang Wu 1 , Jianwei Wang 2 , Xiaobin Niu 2 , Jie Xiong 1
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Due to unprecedented features including high‐energy density, low cost, and light weight, lithium–sulfur batteries have been proposed as a promising successor of lithium‐ion batteries. However, unresolved detrimental low Li‐ion transport rates in traditional carbon materials lead to large energy barrier in high sulfur loading batteries, which prevents the lithium–sulfur batteries from commercialization. In this report, to overcome the challenge of increasing both the cycling stability and areal capacity, a metallic oxide composite (NiCo2O4@rGO) is designed to enable a robust separator with low energy barrier for Li‐ion diffusion and simultaneously provide abundant active sites for the catalytic conversion of the polar polysulfides. With a high sulfur‐loading of 6 mg cm−2 and low sulfur/electrolyte ratio of 10, the assembled batteries deliver an initial capacity of 5.04 mAh cm−2 as well as capacity retention of 92% after 400 cycles. The metallic oxide composite NiCo2O4@rGO/PP separator with low Li‐ion diffusion energy barrier opens up the opportunity for lithium–sulfur batteries to achieve long‐cycle, cost‐effective operation toward wide applications in electric vehicles and electronic devices.
中文翻译：
具有低锂离子扩散能垒的高效隔膜，可解决实用锂硫电池微弱的电导率
由于高能量密度，低成本和轻巧等空前的特性，锂硫电池已被提出作为锂离子电池的有前途的继任者。然而，传统碳材料中无法解决的有害的低锂离子传输速率导致高硫负荷电池中的巨大能量屏障，这阻碍了锂硫电池的商业化。在本报告中，为了克服增加循环稳定性和面容量的挑战，设计了一种金属氧化物复合材料（NiCo 2 O 4 @rGO），以使坚固的隔膜具有较低的能垒，可实现锂离子扩散，并同时提供充足的能量。极性多硫化物催化转化的活性位。硫负荷高达6 mg cm -2且硫/电解质比率低至10，组装的电池在400次循环后的初始容量为5.04 mAh cm -2，而容量保持率为92％。具有低锂离子扩散能垒的金属氧化物复合NiCo 2 O 4 @ rGO / PP隔板为锂硫电池实现长周期，经济高效的运行提供了机会，可广泛应用于电动汽车和电子设备。
更新日期：2019-10-24
中文翻译：
具有低锂离子扩散能垒的高效隔膜，可解决实用锂硫电池微弱的电导率
由于高能量密度，低成本和轻巧等空前的特性，锂硫电池已被提出作为锂离子电池的有前途的继任者。然而，传统碳材料中无法解决的有害的低锂离子传输速率导致高硫负荷电池中的巨大能量屏障，这阻碍了锂硫电池的商业化。在本报告中，为了克服增加循环稳定性和面容量的挑战，设计了一种金属氧化物复合材料（NiCo 2 O 4 @rGO），以使坚固的隔膜具有较低的能垒，可实现锂离子扩散，并同时提供充足的能量。极性多硫化物催化转化的活性位。硫负荷高达6 mg cm -2且硫/电解质比率低至10，组装的电池在400次循环后的初始容量为5.04 mAh cm -2，而容量保持率为92％。具有低锂离子扩散能垒的金属氧化物复合NiCo 2 O 4 @ rGO / PP隔板为锂硫电池实现长周期，经济高效的运行提供了机会，可广泛应用于电动汽车和电子设备。
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