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Applied Mathematics and Mechanics(English Edition) 2023年第2期44卷 189-206页

作者： Yutao SHI chengjun xu Bingbing CHEN Jianqiu ZHOU Rui CAI School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 210000China School of Energy Science and Engineering Nanjing Tech UniversityNanjing 210000China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Flexible solid-state battery has several unique characteristics including high flexibility,easy portability,and high safety,which may have broad application prospects in new technology products such as rollup displays,power implantable medical devices,and wearable *** interfacial mechanical and electrochemical problems caused by bending deformation,resulting in the battery damage and failure,are particularly ***,a fully coupled electro-chemo-mechanical model is developed based on the actual solid-state battery ***-dependent material parameters,stress-dependent diffusion,and potential shift are *** to four bending forms(k=8/mm,0/mm,-8/mm,and free),the results show that the negative curvature bending is beneficial to reducing the plastic strain during charging/discharging,while the positive curvature is ***,with respect to the electrochemical performance,the negative curvature bending creates a negative potential shift,which causes the battery to reach the cut-off voltage earlier and results in capacity *** results enlighten us that suitable electrode materials and charging strategy can be tailored to reduce plastic deformation and improve battery capacity for different forms of battery bending.

关键词： solid-state battery electro-chemo-mechanical coupling model bending deformation phase-transformation plastic deformation

β-MnO_(2) with proton conversion mechanism in rechargeable zinc ion battery

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Journal of Energy Chemistry 2021年第5期30卷 365-373页

作者： Wenbao Liu Xiaoyu Zhang Yongfeng Huang Baozheng Jiang Ziwen Chang chengjun xu Feiyu Kang Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Environment and Material Engineering Yantai UniversityYantai 264005ShandongChina

Rechargeable aqueous zinc ion battery(RAZIB)is a promising energy storage system due to its high safety,and high *** them,manganese oxides with low cost and low toxicity have drawn much ***,the under-debate proton reaction mechanism and unsatisfactory electrochemical performance limit their *** b-MnO_(2) synthesized by hydrothermal method is used to investigate the reaction *** cathode materials for RAZIB,the Zn//b-MnO_(2) delivers 355 mA h g^(-1)(based on cathode mass)at0.1 A g^(-1),and retain 110 mA h g^(-1) after 1000 cycles at 0.2 A g^(-1).Different from conventional zinc ion insertion/extraction mechanism,the proton conversion and Mn ion dissolution/deposition mechanism of b-MnO_(2) is proposed by analyzing the evolution of phase,structure,morphology,and element of b-MnO_(2) electrode,the pH change of electrolyte and the determination of intermediate phase MnO *** ion,as a kind of Lewis acid,also provides protons through the formation of ZHS in the proton reaction *** study of reaction mechanism provides a new perspective for the development of Zn//MnO_(2) battery chemistry.

关键词： Zinc ion battery Manganese dioxide Manganese ion dissolution-deposition Proton conversion

Reversible aqueous zinc-ion battery based on ferric vanadate cathode

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Chinese Chemical Letters 2022年第10期33卷 4628-4634页

作者： Wang Yang Wu Yang Yongfeng Huang chengjun xu Liubing Dong Xinwen Peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China

Rechargeable aqueous zinc-ion batteries have attracted extensive interest because of low cost and high ***,the relationship between structure change of cathode and the zinc ion storage mechanism is still complex and ***,open-structured ferric vanadate(Fe_(2)V_(4)O_(13))has been developed as cathode material for aqueous zinc-ion ***,two zinc ion storage mechanism can be observed simultaneously for the Fe2V4O13 electrode,i.e.,classical intercalation/deintercalation storage mechanism in the tunnel structure of Fe_(2)V_(4)O_(13),and reversible phase transformation from ferric vanadate to zinc vanadate,which is verified by combined studies using various in-situ and ex-situ *** a result,the Fe_(2)V_(4)O_(13) cathode delivers a high discharge capacity of 380 mAh/g at 0.2 A/g,and stable cyclic performance up to 1000 cycles at 10 A/g in the operating window of 0.2-1.6 V with 2 mol/L Zn(CF_(3)SO_(3))_(2) aqueous ***,the assembled Fe_(2)V_(4)O_(13)//Zn flexible quasi-solid-state battery also exhibits a relatively high mechanical strength and good cycling *** findings reveal a new perspective of zinc ion storage mechanism for Fe_(2)V_(4)O_(13),which may also be applicable to other vanadate cathodes,providing a new direction for the investigation and design of zinc-ion batteries.

关键词： Aqueous zinc-ion battery Ferric vanadate cathode Reversible phase transformation Zinc ion storage mechanism Biomass-based flexible quasi-solid-state battery

High-Performance Aqueous Zinc-Ion Batteries Realized by MOF Materials

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Nano-Micro Letters 2020年第11期12卷 126-140页

作者： xuechao Pu Baozheng Jiang Xianli Wang Wenbao Liu Liubing Dong Feiyu Kang chengjun xu Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084People’s Republic of China Tsinghua‑Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518055People’s Republic of China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443People’s Republic of China

Rechargeable aqueous zinc-ion batteries(ZIB s) have been gaining increasing interest for large-scale energy storage applications due to their high safety,good rate capability,and low ***,the further development of ZIB s is impeded by two main challenges:Currently reported cathode materials usually suffer from rapid capacity fading or high toxicity,and meanwhile,unstable zinc stripping/plating on Zn anode seriously shortens the cycling life of *** this paper,metal-organic framework(MOF) materials are proposed to simultaneously address these issues and realize high-performance ZIB s with Mn(BTC) MOF cathodes and ZIF-8-coated Zn(ZIF-8@Zn) *** MOF materials were synthesized,and Mn(BTC) MOF was found to exhibit the best Zn^2+-storage ability with a capacity of 112 mAh g^-***^2+ storage mechanism of the Mn(BTC) was carefully ***,ZIF-8@Zn anodes were prepared by coating ZIF-8 MOF material on Zn *** porous structure of the ZIF-8 coating guided uniform Zn stripping/plating on the surface of Zn *** a result,the ZIF-8@Zn anodes exhibited stable Zn stripping/plating behaviors,with 8 times longer cycle life than bare Zn *** on the above,high-performance aqueous ZIBs were constructed using the Mn(BTC) cathodes and the ZIF-8@Zn anodes,which displayed an excellent long-cycling stability without obvious capacity fading after 900 charge/discharge *** work provides a new opportunity for high-performance energy storage system.

关键词： Zinc-ion battery Metal-organic framework Cathode material Zn anode

Flexible supercapacitors

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Particuology 2013年第4期11卷 371-377页

作者： Shan Shi chengjun xu Cheng Yang Jia Li Hongda Du Baohua Li Feiyu Kang City Key Laboratory of Thermal Management Engineering and Materials Graduate School at ShenzhenTsinghua University State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science & EngineeringTsinghua University

Flexible supercapacitors show a great potential for applications in wearable, miniaturized, portable, large- scale transparent and flexible consumer electronics due to their significant, inherent advantages, such as being flexible, lightweight, low cost and environmentally friendly in comparison with the current energy storage devices. In this report, recent progress on flexible supercapacitors, flexible electrodes and electrolytes is reviewed. In addition, the future challenges and opportunities are discussed.

关键词： Flexible supercapacitorFlexible electrodeCarbon network

Novel Insights into Energy Storage Mechanism of Aqueous Rechargeable Zn/MnO2 Batteries with Participation of Mn2+

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Nano-Micro Letters 2019年第3期11卷 227-239页

作者： Yongfeng Huang Jian Mou Wenbao Liu Xianli Wang Liubing Dong Feiyu Kang chengjun xu Shenzhen Geim Graphene Center Graduate School at ShenzhenTsinghua UniversityShenzhen518055People’s Republic of China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084People’s Republic of China

Aqueous rechargeable Zn/MnO2 zinc-ion batteries(ZIBs)are reviving recently due to their low cost,non-toxicity,and natural ***,their energy storage mechanism remains controversial due to their complicated electrochemical ***,to achieve satisfactory cyclic stability and rate performance of the Zn/MnO2 ZIBs,Mn2+ is introduced in the electrolyte(e.g.,ZnSO4 solution),which leads to more complicated reactions inside the ZIBs ***,based on comprehensive analysis methods including electrochemical analysis and Pourbaix diagram,we provide novel insights into the energy storage mechanism of Zn/MnO2 batteries in the presence of Mn2+.A complex series of electrochemical reactions with the coparticipation of Zn2+,H+,Mn2+,SO42-,and OH-were *** the first discharge process,co-insertion of Zn2+ and H+ promotes the transformation of MnO2 into ZnxMnO4,MnOOH,and Mn2O3,accompanying with increased electrolyte pH and the formation of ZnSO4·3 Zn(OH)2-5 *** the subsequent charge process,ZnxMnO4,MnOOH,and Mn2O3 revert to a-MnO2 with the extraction of Zn2+ and H+,while ZnSO4·3Zn(OH)2·5H2O reacts with Mn2+ to form ZnMn3O7·3 *** the following charge/discharge processes,besides aforementioned electrochemical reactions,Zn2+ reversibly insert into/extract from α-MnO2,ZnxMnO4,and ZnMn3O7·3H2O hosts;ZnSO4·3Zn(OH)2·5 H2O,Zn2Mn3O8,and ZnMn2O4 convert mutually with the participation of Mn2+.This work is believed to provide theoretical guidance for further research on high-performance ZIBs.

关键词： Zinc-ion battery MnO2 cathode Energy storage mechanism Phase evolution

High-performance zinc-ion batteries enabled by electrochemically induced transformation of vanadium oxide cathodes

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Journal of Energy Chemistry 2021年第9期30卷 233-240页

作者： Yang Li Wang Yang Wu Yang Yongfeng Huang Guoxiu Wang chengjun xu Feiyu Kang Liubing Dong College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China Centre for Clean Energy Technology University of Technology Sydney2007 Australia Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Rechargeable aqueous zinc-ion batteries(ZIBs) have become a research hotspot in recent years,due to their huge potential for high-energy,fast-rate,safe and low-cost energy *** realize good electrochemical properties of ZIBs,cathode materials with prominent Zn^(2+) storage capability are highly ***,we report a promising ZIB cathode material based on electrochemically induced transformation of vanadium ***,K_(2) V_6 O_(16)·1.5 H_(2) O nanofibers were synthesized through a simple stirring method at near room temperature and then used as cathode materials for ZIBs in different *** cathode presented superior Zn^(2+) storage capability in Zn(OTf)_(2) aqueous electrolyte,including high capacity of 321 mAh/g,fast charge/discharge ability(96 mAh/g delivered in 35 s), high energy density of 235 Wh/kg and good cycling *** analysis evidenced that in Zn(OTf)_(2) electrolyte,Zn^(2+) intercalation in the first discharge process promoted K_(2) V_6 O_(16)·1.5 H_(2) O nanofibers to transform into Zn_(3+x)V_(2) O_7(OH)_(2)·2 H_(2) O nanoflakes,and the latter served as the Zn^(2+)-storage host in subsequent charge/discharge *** from open-framework crystal structure and sufficiently exposed surface,the Zn_(3+x)V_(2) O_7(OH)_(2)·2_H2 O nanoflakes exhibited high Zn^(2+) diffusion coefficient,smaller charge-transfer resistance and good reversibility of Zn^(2+) intercalation/de-intercalation,thus leading to superior electrochemical *** in ZnS04 aqueous electrolyte,the cathode material cannot sufficiently transform into Zn_(3+x)V_(2) O_7(OH)_(2)·2 H_(2) O thereby corresponding to inferior electrochemical *** mechanism and influencing factors of such a transformation phenomenon was also *** work not only reports a high-performance ZIB cathode material based on electrochemically induced transformation of vanadium oxides,but also provides new insights into Zn^(2+)-storage el

关键词： Zinc-ion battery Cathode material Vanadium oxide Electrochemically induced transformation

Few-layer Ti3C2Tx MXene delaminated via flash freezing for high-rate electrochemical capacitive energy storage

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Journal of Energy Chemistry 2020年第9期29卷 233-240,I0007页

作者： Xianli Wang Liubing Dong Wenbao Liu Yongfeng Huang xuechao Pu Jinjie Wang Feiyu Kang Jia Lia chengjun xu Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Few-layer Ti3C2Tx MXene is synthesized from multi-layered Ti3C2Tx via a flash freezing-assisted delamination *** the flash freezing process,the water molecules in the interlayers of multi-layered MXene are induced to rearrange and produce volume expansion,thus notably expand the MXenes’interlayer distance to form few-layer *** synthesized few-layer Ti3C2Tx MXene nanosheets display a very small thickness(less than 5 Ti3C2 atom-layers)and expanded interlayer ***,the few-layer Ti3C2Tx exhibits enhanced capacitance(255 F g^-1 vs.177 F g^-1 for the multi-layered Ti3C2Tx)and significantly optimized rate capability(150 F g^-1 at 200 mV s^-1 vs.25 F g^-1 for the multi-layered Ti3C2Tx),because redox-active sites in the few-layer MXene are easily accessible to electrolyte ***,an asymmetric supercapacitor is constructed using the few-layer Ti3C2Tx negative electrode and an activated carbon fiber positive *** asymmetric supercapacitor presents a high energy density of 17.9 Wh kg^-1 and a high power density of 14 kW kg^-1,which is inseparable from its wide voltage window of 1.4 V and the good rate performance of the few-layer Ti3C2Tx MXene ***,the flash freezing-assist delamination provides an effective and environmental-friendly strategy to synthesize few-layer MXene materials for high-rate electrochemical energy storage.

关键词： Ti3C2Tx MXene Pseudocapacitance Activated carbon fiber Asymmetric supercapacitor Flash freezing

Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry

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Nano-Micro Letters 2021年第6期13卷 268-283页

作者： Yang Li Wang Yang Wu Yang Ziqi Wang Jianhua Rong Guoxiu Wang chengjun xu Feiyu Kang Liubing Dong College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443People’s Republic of China Centre for Clean Energy Technology University of Technology SydneySydneyNSW 2007Australia Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055People’s Republic of China

Aqueous Zn-ion hybrid supercapacitors(ZHSs)are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance,high safety and low ***,high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional *** porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage,but also optimizes ion transport ***,the cathodes show a high gravimetric capacity of 156 mAh g^(−1),superior rate capability(79 mAh g^(−1)with a very short charge/discharge time of 14 s)and exceptional cycling ***,hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1,a high power density of 15.3 kW kg^(−1)and good anti-self-discharge *** investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn_(4)SO_(4)(OH)_(6)·5H_(2)O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon *** roles of these reactions in energy storage of ZHSs are *** work not only paves a way for high-performance cathode materials of ZHSs,but also provides a deeper understanding of ZHS electrochemistry.

关键词： Zn-ion hybrid supercapacitor Carbon material Fibrous cathode Hierarchical pore structure High-energy

Group VB transition metal dichalcogenides for oxygen reduction reaction and strain-enhanced activity governed by p-orbital electrons of chalcogen

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Nano Research 2019年第4期12卷 925-930页

作者： Shuyang Zhao Ke Wang Xiaolong Zou Lin Gan Hongda Du chengjun xu Feiyu Kang Wenhui Duan Jia Li Guangdong Provincial Key Laboratory of Thermal Management Engineering and Materials Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Shenzhen Geim Graphene Center Division of Energy and Environment Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Tsinghua-Berkeley Shenzhen Institute (TBSI) Tsinghua University Shenzhen 518055 China Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing 100084 China

Developi ng alter native oxyge n reducti on reactio n (ORR) catalysts to replace precious Pt-based metals with abundant materials is the key challe nge of commercial application of fuel cells. Owing to their various compositi ons and tun able electronic properties, transition metal dichalcogenides (TMDs) have the great potential to realize high-efficiency catalysts for ORR. Here, various 3R-phase dichalcogenides of group VB and VIB transition metals (MX2, M = Nb, Ta, Mo, W;X = S, Se, Te) are investigated for ORR catalysts by using density functional theory calculations. The computed over-potentials of group VB TMDs are much less than those of group VIB TMDs. For group VB TMDs, a volcano-type plot of ORR catalytic activity is established on the adsorption energies of *OH, and NbS2 and TaTe2 exhibit best ORR activity with an oveepotential of 0.54 V. To achieve even better activity, strain engineering is performed to tune ORR catalytic activity, and the minimum over-potential of 0.43 V can be realized. We further dem on strate that the shift of p orbital center of surface chalcoge n elements under strain is responsible for tuning the catalytic activity of TMDs.

关键词： transition metal dichalcogenides fuel cells oxygen reduction reaction strain density functional theory (DFT) calculations