Despite the intriguing merits of lithium-sulfur(Li-S) systems, they still suffer from the notorious‘‘shuttling-effect" of polysulfides. Herein, carbon materials with rational tailoring of morphology and pores w...Despite the intriguing merits of lithium-sulfur(Li-S) systems, they still suffer from the notorious‘‘shuttling-effect" of polysulfides. Herein, carbon materials with rational tailoring of morphology and pores were designed for strong loading/adsorption with the controlling of energy-storage ability.Through rational tailoring, it is strongly verified that such engineering of evolutions result in variational of sulfur immobilization in the obtained carbon. As expected, the targeted sample delivers a stable capacity of 925 m Ah g^(-1) after 100 loops. Supporting by the "cutting-off" manners, it is disclosed that mesopores in carbon possess more fascinated traits than micro/macropores in improving the utilization of sulfur and restraining Li_(2)S_x(4≤x≤8). Moreover, the long-chain polysulfide could be further consolidated by auto-doping oxygen groups. Supported by in-depth kinetic analysis, it is confirmed that the kinetics of ion/e-transfer during charging and discharging could be accelerated by mesopores, especially in stages of the formation of solid S_(8) and Li_(2)S, further improving the capacity of ion-storage in Li-S battery. Given this, the elaborate study provide significant insights into the effect of pore structure on kinetic performance about Li-storage behaviors in Li-S battery, and give guidance for improving sulfur immobilization.展开更多
Bismuth oxyhalide(BiOCl)holds promising potential as the anode for sodium-ion batteries(SIBs)due to its high theoretical capacity and unique layered structure.However,its practical applications are hindered by challen...Bismuth oxyhalide(BiOCl)holds promising potential as the anode for sodium-ion batteries(SIBs)due to its high theoretical capacity and unique layered structure.However,its practical applications are hindered by challenges such as large volume variations during cycling,the ambiguous Na^(+)-storage mechanism,and complex synthesis methods.Here,we present a facile and scalable strategy to fabricate a high-performance BiOCl nanosheets anode for SIBs.Through comprehensive in-situ and ex-situ microscopic characterizations and electrochemical analysis,we reveal that the sodiation/desodiation process of the BiOCl nanosheets anode leads to the formation of metallic Bi and Na_(3)OCl.The metallic Bi acts as an active material for Na^(+)storage in subsequent cycles,while the formed Na_(3)OCl enhances the stability of the solidelectrolyte interphase(SEI)layer and facilitates Na^(+)transport.Additionally,the metallic Bi gradually transforms into a nanoporous structure during cycling,improving Na^(+)transport and mitigating volume variations.As a result,the BiOCl nanosheets anode exhibits outstanding electrochemical performance,with impressive rate capability and cycling stability.Furthermore,full cells paired with the Na_(3)V_(2)(PO_(4))_(3)(NVP)cathode and pre-cycled BiOCl nanosheets anode also demonstrate a superior rate and cycling performance.This work offers valuable insight into the development of highperformance anodes for advanced SIBs.展开更多
基金financially supported by National National Key Research and Development Program of China (2019YFC1907801, 2018YFC1900305, 2018YFC1901601, 2018YFC1901602)the Natural Science Foundation of China (52004334, 51622406, 51634009 and U1704252)+4 种基金National 111 Project (No. B14034)the National Key R&D Program of China (2018YFC1901901)the Collab-orative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources, Found of State Key Laboratory of Mineral Processing (BGRIMM-KJSKL-2017-13)the Fundamental Research Funds for the Central Universities of Central South University (2019zzts1712020zzts203)the Hunan Provincial Innovation Foundation for Postgraduate (CX20190227)。
文摘Despite the intriguing merits of lithium-sulfur(Li-S) systems, they still suffer from the notorious‘‘shuttling-effect" of polysulfides. Herein, carbon materials with rational tailoring of morphology and pores were designed for strong loading/adsorption with the controlling of energy-storage ability.Through rational tailoring, it is strongly verified that such engineering of evolutions result in variational of sulfur immobilization in the obtained carbon. As expected, the targeted sample delivers a stable capacity of 925 m Ah g^(-1) after 100 loops. Supporting by the "cutting-off" manners, it is disclosed that mesopores in carbon possess more fascinated traits than micro/macropores in improving the utilization of sulfur and restraining Li_(2)S_x(4≤x≤8). Moreover, the long-chain polysulfide could be further consolidated by auto-doping oxygen groups. Supported by in-depth kinetic analysis, it is confirmed that the kinetics of ion/e-transfer during charging and discharging could be accelerated by mesopores, especially in stages of the formation of solid S_(8) and Li_(2)S, further improving the capacity of ion-storage in Li-S battery. Given this, the elaborate study provide significant insights into the effect of pore structure on kinetic performance about Li-storage behaviors in Li-S battery, and give guidance for improving sulfur immobilization.
基金supported by the National Natural Science Foundation of China(52122211 and 52072323)the Frontier Exploration Projects of Longmen Laboratory(LMQYTSKT008)+2 种基金the Shenzhen Technical Plan Project(JCYJ20220818101003008)the“Double-First Class”Foundation of Materials and Intelligent Manufacturing Discipline at Xiamen Universitythe support of the Nanqiang Young Top-notch Talent Fellowship at Xiamen University.
文摘Bismuth oxyhalide(BiOCl)holds promising potential as the anode for sodium-ion batteries(SIBs)due to its high theoretical capacity and unique layered structure.However,its practical applications are hindered by challenges such as large volume variations during cycling,the ambiguous Na^(+)-storage mechanism,and complex synthesis methods.Here,we present a facile and scalable strategy to fabricate a high-performance BiOCl nanosheets anode for SIBs.Through comprehensive in-situ and ex-situ microscopic characterizations and electrochemical analysis,we reveal that the sodiation/desodiation process of the BiOCl nanosheets anode leads to the formation of metallic Bi and Na_(3)OCl.The metallic Bi acts as an active material for Na^(+)storage in subsequent cycles,while the formed Na_(3)OCl enhances the stability of the solidelectrolyte interphase(SEI)layer and facilitates Na^(+)transport.Additionally,the metallic Bi gradually transforms into a nanoporous structure during cycling,improving Na^(+)transport and mitigating volume variations.As a result,the BiOCl nanosheets anode exhibits outstanding electrochemical performance,with impressive rate capability and cycling stability.Furthermore,full cells paired with the Na_(3)V_(2)(PO_(4))_(3)(NVP)cathode and pre-cycled BiOCl nanosheets anode also demonstrate a superior rate and cycling performance.This work offers valuable insight into the development of highperformance anodes for advanced SIBs.
