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MoS_(2)/MoO_(2) nanosheets anchored on carbon cloth for high-performance magnesium-and sodium-ion storage

Journal of Materials Science & Technology 2023年第12期143卷 43-53页

作者： Hui Wu Zhennan Xiong Yiyang Mao Huihui Zhang Yingying Hu Jun Shen Baofeng Wang Xuebin Yu Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric PowerShanghai 200090China

Developing new types of rechargeable metal-ion batteries beyond lithium-ions,including alkaline ion(such as Na+,K+)and multivalent ion(such as Mg 2+,Zn 2+,Ca 2+and Al 3+)batteries,is progressing quickly towards large-scale energy storage systems.However,the major obstacle to their large-scale applications has been a lack of appropriate electrode materials with reversible metal ions insertion/extraction be-havior,resulting in inferior electrochemical performance.Here we develop a well-designed MoS_(2)/MoO_(2) hybrid nanosheets anchored on carbon cloth(MoS_(2)/MoO_(2)/CC)as electrode materials.This rational de-sign can effectively shorten ion diffusion distance,increase electric conductivity of the electrode,and buffer volume change.Benefiting from the synergistic effect of structural and compositional features,the MoS_(2)/MoO_(2)/CC electrode exhibits high initial reversible capacities(326 mA h g^(−1) at 0.1 A g^(−1) in magnesium-ion storage;1270 mA h g^(−1) at 0.1 A g^(−1) in sodium-ion storage),excellent rate capacities(57 mA h g^(−1) at 10 A g^(−1) in magnesium-ion storage;335 mA h g^(−1) at 5 A g^(−1) in sodium-ion storage)and long-term cycling stability(105 mA h g^(−1) after 600 cycle at 1 A g^(−1) in magnesium-ion storage;208 mA h g^(−1) after 600 cycles at 5 A g^(−1) in sodium-ion storage).We expect that the multi-engineering strategy will provide some valuable insights for the development of other advanced electrode materials for high-performance metal-ion batteries.

关键词： Metal-ion batteries MoS_(2)/MoO_(2)/CC Magnesium and sodium storage high reversibility

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A Tip-Inhibitor Interphase Embedded with Soluble Polysulfides for high-Voltage Li Metal Batteries

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Energy & Environmental Materials 2023年第4期6卷 157-165页

作者： Xueyang Cui Jiancong Cheng Chen Li Zongqiang Sun Kaixuan Li Yajing Wang Xiaoxiang Fan Shuai Tang Xiaodong Lin Ruming Yuan Bingwei Mao Mingsen Zheng Quanfeng Dong State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollaborative Innovation Center of Chemistry for Energy Materials(i-Ch EM)Engineering Research Centre of Electrochemical Technologies of Ministry of EducationCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

The high-voltage battery has now become a goal in order to meet the demands for high energy density.However,the severe side reactions between Li metal and carbonate-based electrolytes in this system result in unstable interphase,leading to non-uniform Li-ion flux and thus aggravating the dendrite growth of Li.The protect interphase,traditional solid electrolyte interface(SEI),is a loose solid layer consisted of many components,which generally does not possess the function of preventing the lithium budding.Herein,based on polysulfide solubility in ester,we proposed a strategy to eliminate the dendrite by constructing a unique SEI in which the dynamic polysulfides were in situ formed and encapsuled.For this purpose,a 2-fluorophenylsulfur pentafluoride(2-FSPF)was employed as an additive in carbonate-based electrolyte that can be decomposed electrochemically during battery operation to form such a polysulfide-rich interphase.These polysulfides with certain fluidity can adhere to dynamically the budding tip of Li metal,as a so-called tip-inhibitor,when the local current density of the tip rising,thus to hinder Li^(+)diffusion toward the tip,resulting in inhibiting the further growth of Li dendrites and leveling the Li deposition.At the current density of 1 mA cm^(-2),the average Coulombic efficiency of Li//Cu cells is as high as 98.39%during 600 cycles,and the stable cycling of Li//Li symmetric cell reaches 3500 h.Furthermore,due to the high anodic stability,the Li//high-voltage LiCoO_(2)(LCO)full cells and Li–O_(2)battery achieve excellent cycle performance with lean electrolyte.

关键词： carbonate-based electrolyte free-dendrite high reversibility high-voltage battery lithium metal anode

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Cross-Linked Hollow Graphitic Carbon as Low-Cost and high-Performance Anode for Potassium Ion Batteries

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Energy & Environmental Materials 2021年第3期4卷 451-457页

作者： Yanhong Feng Suhua Chen Dongyang Shen Jiang Zhou Bingan Lu School of Physics and Electronics Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and DevicesState Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082China School of Materials Science and Engineering Central South UniversityChangsha 410083China

Large-scale and low-cost preparation of carbon-based potassium anode with long life and high capacity is one of the footstones for the development of potassium ion batteries(PIBs).Herein,a low-cost carbon-based material,cross-linked hollow graphitic carbon(HGC),is large scale synthesized to apply for PIBs anode.Its hollow structure can afford sufficient space to overcome the damage caused by the volume expansion of graphitic carbon(GC).While the cross-linked structure forms a compact interconnection network that allows electrons to rapid transfer between different GC frameworks.Electrochemical measurements demonstrated that the HGC anode exhibited low charge/discharge plateau(about 0.25 V and 0.1 V)and excellent specific capacity as high as 298 m A h g^(-1)at the current density of 50 m A g^(-1).And more important,after 200 cycles the capacity of HGC anode still shows 269 m A h g^(-1)(the decay rate of per cycle is only 0.048%).Meanwhile,the use of commercial traditional electrolyte(KPF_(6))and cheap raw materials that provide new hope for trying and realizing the large-scale production of PIBs based on carbon anode materials.

关键词： cross-linked hollow structure graphitic material high reversibility potassium ion battery

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