摘要：The practical application of high-energy lithium–sulfur battery is plagued with two deadly *** is the“shuttle effect”originated from the sulfur cathode,and the other is the low Coulombic efficiency and security issues arising from the lithium metal *** addressing these issues,we propose a novel silicon-sulfurized poly(acrylonitrile)full *** this lithium metal-free system,the Li source is pre-loaded in the cathode,using a nitrogen evolution reaction(NER)to implant Li+into the silicon/carbon *** poly(acrylonitrile)based on a solid–solid conversion mechanism can fundamentally circumvent the“shuttle effect”.Meanwhile,the silicon/carbon anode can achieve more efficient utiliza-tion and higher security when compared with the Li metal *** full cell used in this technology can deliver a capacity of 1169.3 mAh g^(-1),and it can be stabilized over 100 cycles,implying its excellent elec-trochemical ***,the practical pouch cell with a high sulfur loading of 4.2 mg cm^(-2)can achieve a high specific energy of 513.2 Wh *** mechanism of the NER in cathode has also been investigated and analyzed by in situ ***,this battery design completely conforms to the current battery production technology because of the degassing of gasbag,resulting in a low manufactur-ing *** work will open the avenue to develop a lithium metal-free battery using the NER.

摘要：Fabrication of efficient solid luminogens with tunable emission is both fundamentally significant and technically important. Herein, based on our previous strategy for the construction of efficient and multifunctional solid luminogens through the combination of diverse aggregation-induced emission （ALE） units with other functional moieties, a group of luminophores with electron donor-acceptor （D-A） structure and typical intramolecular charge transfer （ICT） characteristics, namely CZ-DCDPP, DPA-DCDPP and DBPA-DCDPP were synthesized and investigated. The presence of twisting and AlE-active 2,3- dicyano-S,6-diphenylpyrazine （DCDPP） moiety endows them highly emissive in the solid states, whereas the introduction of arylamines with varied electron-donating capacity and different conjugation render them with tunable solid emissions from green to red. While CZ-DCDPP and DPA-DCDPP solids exhibit distinct mechanochromism, both DPA-DCDPP and DBPA-DCDPP solids can generate efficient red emission. Owing to their high efficiency, remarkable thermal and morphological stabilities and moreover red emission, they are promising for diverse optoelectronic and biological applications.

摘要：高容量材料对于实现锂离子电池高能量密度至关重要.本文通过一种新颖、简便的冷冻干燥与原位镁热还原相结合的方法,以二氧化硅和氧化石墨烯为原料制备了一种高度分散的三维石墨烯包裹多孔纳米硅复合负极材料(P-Si@rGO).该材料具有许多吸引人的特性:高度分散和被单独包覆的硅颗粒,硅和石墨烯之间紧密的Si–O–C相互作用,硅结构的多孔设计以及高孔隙率.这些优点显著增强了电极的反应动力学,赋予了复合材料更大的电接触面积和足够的缓冲空间以应对硅在锂化/脱锂过程中的体积变化,最终使P-Si@rGO获得优异的循环稳定性.本文研究了复合材料的相组成和微观结构对其电化学性能的影响,分析了电极在循环后期容量增加的原因,为硅基负极的功能化演变提供了新的思路.