Dense coating of Li4Ti5O12 and graphene mixture on the separator to produce long cycle life of lithium-sulfur battery
Dense coating of Li4Ti5O12 and graphene mixture on the separator to produce long cycle life of lithium-sulfur battery
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在隔膜上密集涂覆Li4Ti5O12和石墨烯混合物可提高锂硫电池的长循环寿命
DOI：
10.1016/j.nanoen.2016.09.030
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发表时间：
2016-12
期刊：
影响因子：
17.6
通讯作者：
Yang Quan-Hong
中科院分区：
文献类型：
--
作者：
Zhao Yan;Liu Ming;Lv Wei;He Yan-Bing;Wang Chao;Yun Qinbai;Li Baohua;Kang Feiyu;Yang Quan-Hong
多硫化物在电解质中的高溶解度以及由此产生的差的循环性能是锂-硫（Li-S）电池的工业生产和使用的主要障碍之一。我们开发了一种新型的混合和致密的隔膜涂层，大大提高了电池的循环和倍率性能。该涂层由均匀嵌入石墨烯层中的单分散Li 4 Ti 5 O 12（LTO）纳米球制成。在这种混合致密涂层中，LTO纳米球具有对多硫化物的高化学亲和力和优异的离子导电性，以产生高效的离子导电通道，而石墨烯层作为多硫化物的物理屏障和上集电器发挥双重作用。独特的杂化保证了非常致密的涂层，不会显著增加电池的体积，同时实现了多硫化物扩散的有效屏障与快速离子传输的理想组合。对于普通涂层，需要松散且非常厚的结构来满足这些要求。使用具有致密涂层隔板的纯硫电极的电池表现出超高倍率性能（2 C时为709 mA h g− 1，0.1 C时为1408 mA h g− 1）和优异的循环性能（1 C下500次循环后为697 mA h g− 1，容量保持率为85.7%）。这种优异性能的容易实现表明生产工业实用的Li-S电池的可能性。
The high solubility of polysulfides in the electrolyte, together with the resulting poor cycling performance, is one of the main obstacles to the industrial production and use of lithium-sulfur (Li-S) batteries. We have developed a novel hybrid and dense separator coating that greatly improves the cycling and rate performance of the battery. The coating is fabricated by mono-dispersed Li4Ti5O12(LTO) nanospheres uniformly embedded in graphene layers. In this hybrid dense coating, the LTO nanospheres have a high chemical affinity for polysulfides and an excellent ionic conductivity to produce highly efficient ionic conductive channels, while the graphene layers play twin roles as a physical barrier for polysulfides and an upper current collector. The unique hybridization guarantees a very dense coating that does not significantly add the volume of the battery and meanwhile achieves an ideal combination of an effective barrier for polysulfide diffusion with a fast ion transport. For a normal coating, a loose and very thick structure is needed to meet these requirements. Cells using a pure sulfur electrode with the dense coating separator show an ultra-high rate performance (709 mA h g−1at 2 C and 1408 mA h g−1at 0.1 C) and an excellent cycling performance (697 mA h g−1after 500 cycles at 1 C with 85.7% capacity retention). The easy achieving of such excellent performance indicates the possibility of producing an industrially practical Li-S battery.
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影响因子：
32.5
作者：
Mingpeng Yu;Junsheng Ma;Hongquan Song;Aiji Wang;Fuyang Tian;Yinshu Wang;H. Qiu;Rongming Wang
通讯作者：
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影响因子：
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作者：
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影响因子：
27.8
作者：
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通讯作者：
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影响因子：
10.9
作者：
Li, Baohua;Li, Zhengjie;Yang, Quan-Hong;Kang, Feiyu
通讯作者：
Kang, Feiyu
DOI：
10.1039/c3cp53882f
发表时间：
2013-11
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Jun Liu;K. Tang;Kepeng Song;P. V. van Aken;Yan Yu;J. Maier
通讯作者：
Jun Liu;K. Tang;Kepeng Song;P. V. van Aken;Yan Yu;J. Maier