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Tuning the solubility of polysulfides for constructing practical lithium-sulfur battery

Journal of Energy Chemistry 2024年第8期95卷 611-617,I0013页

作者： Jiapeng Li Jianlong Cong Haijin Ji Ting Shi Lixia Yuan Yunhui Huang State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Li-S batteries are regarded as one of the most promising candidates for next-generation battery systems with high energy density and low ***,the dissolution-precipitation reaction mechanism of the sulfur(S)cathode enhances the kinetics of the redox processes of the insulating sulfu r,which also arouses the notorious shuttle effect,leading to serious loss of S species and corrosion of Li *** get a balance between the shuttle restraining and the kinetic property,a combined strategy of electrolyte regulation and cathode modification is proposed via introducing 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoroprpyl ether(HFE)instead of 1,2-dimethoxyethane(DME),and seS_(7)instead of S_*** introduction of HFE tunes the solvation structure of the LiTFSI and the dissolution of intermediate polysulfides with se doping(LiPSses),and optimize the interface stability of the Li anode *** minor se substitution compensates the decrease in kinetic due to the decreased solubility of *** this way,the Li-seS_(7)batteries deliver a reversible capacity of 1062 and 1037 mAh g^(-1)with 2.0 and 5.5 mg seS_(7)cm^(-2)loading condition,***,an electrolyte-electrode loading model is established to explain the relationship between the optimal electrolyte and cathode *** makes more sense to guide the electrolyte design for practical Li-S batteries.

关键词： Li-S batteries Lithium polysulfides Solubility Shuttle effect Interface se doping

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Thermoelectric performance of p-type zone-melted se-doped Bi_(0.5)Sb_(1.5)Te_3 alloys

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Rare Metals 2018年第4期37卷 308-315页

作者： Ren-Shuang Zhai Ye-Hao Wu Tie-Jun Zhu Xin-Bing Zhao State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University

For zone-melted （ZM） bismuth telluride-based alloys, which are widely commercially available for solidstate cooling and low-temperature power generation around room temperature, introducing point defects is the chief approach to improve their thermoelectric performance. Herein, we report the multiple effects of se doping on thermoelectric performance of p-type Bi0.5Sb1,5Te3-xsex ＋ 3 wt% Te ZM ingots, which increases carrier concentration, reduces lattice thermal conductivity and deteriorates the carrier mobility. As a result, the peak figure of merit （ZT） is shifted to a higher temperature and a high ZT 1.2 at 350 K is obtained, due to the reduced thermal conductivity and suppressed intrinsic conduction. Further, decreasing Sb content is followed to optimize the room temperature performance and a ZT - 1.1 at 300 K is obtained. These results are significant for designing and optimizing the thermoelectric performance of commercial Bi0.5Sb1.5Te3＋ 3 wt% Te ZM alloys.

关键词： Thermoelectric materials Bismuth telluride Zone melting se doping Bi0.5Sb1.5Te3

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Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by se： An experimental and theoretical study

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Nano Research 2016年第1期9卷 117-127页

作者： Haiyu Fang Je-Hyeong Bahk Tianli Feng Zhe Cheng Amr M. S. Mohammed Xinwei Wang Xiulin Ruan Ali Shakouri Yue Wu School of Chemical Engineering Purdue University West Lafayette IN 47907 USA Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USA School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA Department of Mechanical Engineering Iowa State University Ames IA 50011 USA Department of Chemical and Biological Engineering Iowa State University Ames IA 50011 USA

We report the investigation of the thermoelectric properties of large-scale solution-synthesized Bi2Te3 nanocomposites prepared from nanowires hot- pressed into bulk pellets. A third element, se, is introduced to tune the carrier concentration of the nanocomposites. Due to the se doping, the thermoelectric figure of merit （ZT） of the nanocomposites is significantly enhanced due to the increased power factor and reduced thermal conductivity. We also find that thermal transport in our hot-pressed pellets is anisotropic, which results in different thermal conductivities along the in-plane and cross-plane directions. Theoretical calculations for both electronic and thermal transport are carried out to establish fundamental understanding of the material system and provide directions for further ZT optimization with adjustments to carrier concentration and mobility.

关键词： Bi2Te3 se doping solution synthesis nanostructure thermoelectric

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