The demand on low-carbon emission fabrication technologies for energy storage materials is increasing dramatically with the global interest on carbon neutrality.As a promising active material for metal-sulfur batterie...The demand on low-carbon emission fabrication technologies for energy storage materials is increasing dramatically with the global interest on carbon neutrality.As a promising active material for metal-sulfur batteries,sulfur is of great interest due to its high-energy-density and abundance.However,there is a lack of industry-friendly and low-carbon fabrication strategies for high-performance sulfur-based active particles,which,however,is in critical need by their practical success.Herein,based on a hail-inspired sulfur nano-storm(HSN)technology developed in our lab,we report an energy-saving,solvent-free strategy for producing core-shell sulfur/carbon electrode particles(CNT@AC-S)in minutes.The fabrication of the CNT@AC-S electrode particles only involves low-cost sulfur blocks,commercial carbon nanotubes(CNT)and activated carbon(AC)micro-particles with high specific surface area.Based on the above core-shell CNT@AC-S particles,sulfur cathode with a high sulfur-loading of 9.2 mg cm^(-2) delivers a stable area capacity of 6.6 mAh cm^(-2) over 100 cycles.Furthermore,even for sulfur cathode with a super-high sulfur content(72 wt%over the whole electrode),it still delivers a high area capacity of 9 mAh cm^(-2) over50 cycles in a quasi-lean electrolyte condition.In a nutshell,this study brings a green and industryfriendly fabrication strategy for cost-effective production of rationally designed S-rich electrode particles.展开更多
采用过氧化氢在常温常压下对模拟含硫废水进行受控氧化,探讨了受控氧化过程对单质硫收率的影响,并对氧化过程中固相产物的形态特性进行了研究.结果表明,在过氧化氢投加量为9 m L·L-1、初始p H为6、反应时间为10min条件下,将反应体...采用过氧化氢在常温常压下对模拟含硫废水进行受控氧化,探讨了受控氧化过程对单质硫收率的影响,并对氧化过程中固相产物的形态特性进行了研究.结果表明,在过氧化氢投加量为9 m L·L-1、初始p H为6、反应时间为10min条件下,将反应体系氧化还原电位(ORP)控制在(30±5)m V时能较好实现含硫废水的受控氧化,此时单质硫收率达76.35%,当体系ORP由(-50±5)m V升高至(50±5)m V时,副产物S2O2-3收率显著下降,由26.54%下降至5.32%.X射线衍射分析表明,氧化过程中的固相产物主要为正交晶系斜方硫;扫描电子显微镜分析表明,液相中的单质硫由多个极小的颗粒聚集而成,其粒径由纳米级逐渐增大至微米级.同时,通过向反应体系中加入分散剂证明了单质硫颗粒增大的主要原因是颗粒间发生了团聚.展开更多
采用简单的微波辅助的方法成功制备了硫/膨胀石墨复合材料。膨胀石墨可以用作锂硫电池中阴极的微型容器及集流体。通过控制硫与膨胀石墨的配比成功控制了复合材料中硫颗粒的大小。当硫与膨胀石墨的比例为10∶1时,可以得到相对较均匀的...采用简单的微波辅助的方法成功制备了硫/膨胀石墨复合材料。膨胀石墨可以用作锂硫电池中阴极的微型容器及集流体。通过控制硫与膨胀石墨的配比成功控制了复合材料中硫颗粒的大小。当硫与膨胀石墨的比例为10∶1时,可以得到相对较均匀的硫颗粒。同时研究了不同条件下所制样品的锂硫电池性能。结果表明,硫的含量与硫颗粒的大小对锂硫电池的容量非常重要。当硫与膨胀石墨的比例为10∶1时,在0.1C放电速率下,复合材料具有最高的放电容量1 020 m Ah·g^(-1)。展开更多
将2D纳米片NiFeP生长在Ketjen Black ECP-600JD炭黑(KB)上制备出花球颗粒状NiFeP/KB电催化剂,再将其与纳米硫颗粒按适当比例均匀混合制备出锂硫电池的正极。这种S/NiFeP/KB正极在0.1C下首次放电比容量为1454.5 mAh/g,循环200次后仍有821...将2D纳米片NiFeP生长在Ketjen Black ECP-600JD炭黑(KB)上制备出花球颗粒状NiFeP/KB电催化剂,再将其与纳米硫颗粒按适当比例均匀混合制备出锂硫电池的正极。这种S/NiFeP/KB正极在0.1C下首次放电比容量为1454.5 mAh/g,循环200次后仍有821.1 mAh/g,在2C下300次循环后比容量为639.9 mAh/g,容量保持率达74.7%;使用NiFeP/KB电催化剂能提高电池中多硫化锂的氧化、还原反应速率,从而改善锂、硫反应动力学。展开更多
基金supported by the Double First-Class Construction Funds of Sichuan University and National Natural Science Foundation of China(NNSFC)financial support from the National Science Foundation of China(51873126,51422305,51721091)。
文摘The demand on low-carbon emission fabrication technologies for energy storage materials is increasing dramatically with the global interest on carbon neutrality.As a promising active material for metal-sulfur batteries,sulfur is of great interest due to its high-energy-density and abundance.However,there is a lack of industry-friendly and low-carbon fabrication strategies for high-performance sulfur-based active particles,which,however,is in critical need by their practical success.Herein,based on a hail-inspired sulfur nano-storm(HSN)technology developed in our lab,we report an energy-saving,solvent-free strategy for producing core-shell sulfur/carbon electrode particles(CNT@AC-S)in minutes.The fabrication of the CNT@AC-S electrode particles only involves low-cost sulfur blocks,commercial carbon nanotubes(CNT)and activated carbon(AC)micro-particles with high specific surface area.Based on the above core-shell CNT@AC-S particles,sulfur cathode with a high sulfur-loading of 9.2 mg cm^(-2) delivers a stable area capacity of 6.6 mAh cm^(-2) over 100 cycles.Furthermore,even for sulfur cathode with a super-high sulfur content(72 wt%over the whole electrode),it still delivers a high area capacity of 9 mAh cm^(-2) over50 cycles in a quasi-lean electrolyte condition.In a nutshell,this study brings a green and industryfriendly fabrication strategy for cost-effective production of rationally designed S-rich electrode particles.
文摘采用简单的微波辅助的方法成功制备了硫/膨胀石墨复合材料。膨胀石墨可以用作锂硫电池中阴极的微型容器及集流体。通过控制硫与膨胀石墨的配比成功控制了复合材料中硫颗粒的大小。当硫与膨胀石墨的比例为10∶1时,可以得到相对较均匀的硫颗粒。同时研究了不同条件下所制样品的锂硫电池性能。结果表明,硫的含量与硫颗粒的大小对锂硫电池的容量非常重要。当硫与膨胀石墨的比例为10∶1时,在0.1C放电速率下,复合材料具有最高的放电容量1 020 m Ah·g^(-1)。
