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Healing High-Loading Sulfur Electrodes with Unprecedented Long Cycling Life: Spatial Heterogeneity Control
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-03-28 , DOI: 10.1021/jacs.6b12358 Hong-Jie Peng 1 , Jia-Qi Huang 1 , Xin-Yan Liu 1 , Xin-Bing Cheng 1 , Wen-Tao Xu 1 , Chen-Zi Zhao 1 , Fei Wei 1 , Qiang Zhang 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-03-28 , DOI: 10.1021/jacs.6b12358 Hong-Jie Peng 1 , Jia-Qi Huang 1 , Xin-Yan Liu 1 , Xin-Bing Cheng 1 , Wen-Tao Xu 1 , Chen-Zi Zhao 1 , Fei Wei 1 , Qiang Zhang 1
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Self-healing capability helps biological systems to maintain their survivability and extend their lifespan. Similarly, self-healing is also beneficial to next-generation secondary batteries because high-capacity electrode materials, especially the cathodes such as oxygen or sulfur, suffer from shortened cycle lives resulting from irreversible and unstable phase transfer. Herein, by mimicking a biological self-healing process, fibrinolysis, we introduced an extrinsic healing agent, polysulfide, to enable the stable operation of sulfur microparticle (SMiP) cathodes. An optimized capacity (∼3.7 mAh cm-2) with almost no decay after 2000 cycles at a high sulfur loading of 5.6 mg(S) cm-2 was attained. The inert SMiP is activated by the solubilization effect of polysulfides whereas the unstable phase transfer is mediated by mitigated spatial heterogeneity of polysulfides, which induces uniform nucleation and growth of solid compounds. The comprehensive understanding of the healing process, as well as of the spatial heterogeneity, could further guide the design of novel healing agents (e.g., lithium iodine) toward high-performance rechargeable batteries.
中文翻译：
具有前所未有的长循环寿命的修复高负载硫电极：空间异质性控制
自愈能力有助于生物系统保持其生存能力并延长其寿命。同样，自修复也有利于下一代二次电池，因为高容量电极材料，尤其是氧或硫等正极，由于不可逆和不稳定的相转移而导致循环寿命缩短。在此，通过模拟生物自愈过程纤维蛋白溶解，我们引入了一种外源性愈合剂多硫化物，以实现硫微粒 (SMiP) 阴极的稳定运行。获得了优化的容量（~3.7 mAh cm-2），在 5.6 mg(S) cm-2 的高硫负载下，2000 次循环后几乎没有衰减。惰性 SMiP 由多硫化物的增溶作用激活，而不稳定的相转移由多硫化物的空间异质性减轻介导，从而诱导固体化合物的均匀成核和生长。对愈合过程以及空间异质性的全面理解可以进一步指导新型愈合剂（例如碘锂）的设计，以开发高性能可充电电池。
更新日期：2017-03-28
中文翻译：
具有前所未有的长循环寿命的修复高负载硫电极：空间异质性控制
自愈能力有助于生物系统保持其生存能力并延长其寿命。同样，自修复也有利于下一代二次电池，因为高容量电极材料，尤其是氧或硫等正极，由于不可逆和不稳定的相转移而导致循环寿命缩短。在此，通过模拟生物自愈过程纤维蛋白溶解，我们引入了一种外源性愈合剂多硫化物，以实现硫微粒 (SMiP) 阴极的稳定运行。获得了优化的容量（~3.7 mAh cm-2），在 5.6 mg(S) cm-2 的高硫负载下，2000 次循环后几乎没有衰减。惰性 SMiP 由多硫化物的增溶作用激活，而不稳定的相转移由多硫化物的空间异质性减轻介导，从而诱导固体化合物的均匀成核和生长。对愈合过程以及空间异质性的全面理解可以进一步指导新型愈合剂（例如碘锂）的设计，以开发高性能可充电电池。
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