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Nitrogen/sulfur co-doped hollow carbon nanofiber anode obtained from polypyrrole with enhanced electrochemical performance for Na-ion batteries

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Science Bulletin 2018年第2期63卷 126-132页

作者： Zhigao Luo Sainan Liu Yangshen Cai Shi Li Anqiang Pan Shuquan Liang School of Materials Science and Engineering Central South University Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University

Polypyrrole and sulfur derived hollow carbon nanofibers co-doped with nitrogen/sulfur are synthesized and applied as the anode for Na-ion batteries(NIBs). Successful doping of hollow carbon nanofiber with nitrogen and sulfur is confirmed by X-ray photoelectron spectroscopy, scanning and tunneling electron microscopy. Further analysis certifies that sulfur doping has a significant impact in improving the elecctrochemical performance of the carbon-based anodes for NIBs. The obtained N-doped hollow carbon nanofiber and N/S co-doped hollow carbon nanofiber exhibit similar morphologies but different electrochemical behavior. As expected, the N/S co-doped hollow carbon nanofiber anode exhibits enhanced electrochemical performance, including high specific capacity, outstanding long-term stability, and good rate stability.

关键词：电气化学阳极 Na 性能电池离子碳硫

Building Ultra-Stable and Low-Polarization Composite Zn Anode Interface via Hydrated Polyzwitterionic Electrolyte Construction

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Nano-Micro Letters 2022年第6期14卷 99-115页

作者： Qiong He Guozhao Fang Zhi Chang Yifang Zhang Shuang Zhou Miao Zhou Simin Chai Yue Zhong Guozhong Cao Shuquan Liang Anqiang Pan School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083People’s Republic of China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA

Aqueous zinc metal batteries are noted for their costeffectiveness,safety and environmental friendliness.However,the water-induced notorious issues such as continuous electrolyte decomposition and uneven Zn electrochemical deposition remarkably restrict the development of the long-life zinc metal batteries.In this study,zwitterionic sulfobetaine is introduced to copolymerize with acrylamide in zinc perchlorate(Zn(ClO;);)solution.The designed gel framework with hydrophilic and charged groups can firmly anchor water molecules and construct ion migration channels to accelerate ion transport.The in situ generated hybrid interface,which is composed of the organic functionalized outer layer and inorganic Clcontaining inner layer,can synergically lower the mass transfer overpotential,reduce water-related side reactions and lead to uniform Zn deposition.Such a novel electrolyte configuration enables Zn//Zn cells with an ultra-long cycling life of over 3000 h and a low polarization potential(~0.03 V)and Zn//Cu cells with high Coulombic efficiency of 99.18%for 1000 cycles.Full cells matched with MnO;cathodes delivered laudable cycling stability and impressive shelving ability.Besides,the flexible quasi-solid-state batteries which are equipped with the anti-vandalism ability(such as cutting,hammering and soaking)can successfully power the LED simultaneously.Such a safe,processable and durable hydrogel promises significant application potential for long-life flexible electronic devices.

关键词： Quasi-solid electrolyte interface Polyzwitterionic hydrogel electrolytes High performance Manganese dioxides Zinc metal anodes

Suppressing by-product via stratified adsorption effect to assist highly reversible zinc anode in aqueous electrolyte

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Journal of Energy Chemistry 2021年第4期30卷 549-556页

作者： Miao Zhou Shan Guo Guozhao Fang Hemeng Sun Xinxin Cao Jiang Zhou Anqiang Pan Shuquan Liang School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083HunanChina

The development of promising zinc anodes mainly suffers from their low plating/stripping coulombic efficiencies when using aqueous electrolyte,which are mainly associated with the interfacial formation of irreversible by-products.It is urgent to develop technologies that can solve this issue fundamentally.Herein,we report an artificial Sc_(2)O_(3) protective film to construct a new class of interface for Zn anode.The density functional theory simulation and experimental results have proven that the interfacial side reaction was inhibited via a stratified adsorption effect between this artificial layer and Zn anode.Benefiting from this novel structure,the Sc_(2)O_(3)-coated Zn anode can run for more than 100 cycles without short circuit and exhibit low voltage hysteresis,and the coulombic efficiency increases by 1.2%.Importantly,it shows a good application prospect when matched with two of popular manganese-based and vanadium-based cathodes.The excellent electrochemical performance of the Sc_(2)O_(3)-coated Zn anode highlights the importance of rational design of anode materials and demonstrates a good way for developing high-performance Zn anodes with long lifespan and high efficiency.

关键词： Zn anode Artificial protective film Stratified adsorption Interfacial reaction Zn4SO4(OH)6·H2O by-products

Tuning Interface Bridging Between MoSe2 and Three‑Dimensional Carbon Framework by Incorporation of MoC Intermediate to Boost Lithium Storage Capability

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Nano-Micro Letters 2020年第12期12卷 146-158页

作者： Jing Chen Yilin Luo Wenchao Zhang Yu Qiao Xinxin Cao Xuefang Xie Haoshen Zhou Anqiang Pan Shuquan Liang School of Materials Science and Engineering Central South UniversityChangsha 410083HunanPeople’s Republic of China Energy Interface Technology Group National Institute of Advanced Industrial Science and Technology1‑1‑1UmezonoTsukuba 305‑8568Japan Institute for Superconducting and Electronic Materials School of MechanicalMaterialsMechatronics and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongWollongongNSW 2500Australia Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071People’s Republic of China

Interface engineering has been widely explored to improve the electrochemical performances of composite electrodes,which governs the interface charge transfer,electron transportation,and structural stability.Herein,MoC is incorporated into MoSe2/C composite as an intermediate phase to alter the bridging between MoSe2-and nitrogen-doped three-dimensional(3D)carbon framework as MoSe2/MoC/N–C connection,which greatly improve the structural stability,electronic conductivity,and interfacial charge transfer.Moreover,the incorporation of MoC into the composites inhibits the overgrowth of MoSe2 nanosheets on the 3D carbon framework,producing much smaller MoSe2 nanodots.The obtained MoSe2 nanodots with fewer layers,rich edge sites,and heteroatom doping ensure the good kinetics to promote pseudo-capacitance contributions.Employing as anode material for lithium-ion batteries,it shows ultralong cycle life(with 90%capacity retention after 5000 cycles at 2 A g−1)and excellent rate capability.Moreover,the constructed LiFePO4//MoSe2/MoC/N–C full cell exhibits over 86%capacity retention at 2 A g−1 after 300 cycles.The results demonstrate the effectiveness of the interface engineering by incorporation of MoC as interface bridging intermediate to boost the lithium storage capability,which can be extended as a potential general strategy for the interface engineering of composite materials.

关键词： Interface engineering Porous carbon framework MoSe2 nanodots MoC Heterostructure Battery

Metal-organic framework-derived porous shuttle-like vanadium oxides for sodium-ion battery application

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Nano Research 2018年第1期11卷 449-463页

作者： Yangsheng Cai Guozhao Fang Jiang Zhou Sainan Liu Zhigao Luo Anqiang Pan Guozhong Cao I Shuquan Liang School of Materials Science and Engineering Central South University Changsha 410083 China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University Changsha 410083 China Department of Materials and Engineering University of Washington Seattle WA 98195-2120 USA

Vanadium oxides with a layered structure are promising candidates for both lithium-ion batteries and sodium-ion batteries （SIBs）. The self-template approach, which involves a transformation from metal-organic frameworks （MOFs） into porous metal oxides, is a novel and effective way to achieve desirable electrochemical performance. In this stud~ porous shuttle-like vanadium oxides （i.e., V205, V203/C） were successfully prepared by using MIL-88B （V） as precursors with a specific calcination process. As a proof-of-concept application, the as- prepared porous shuttle-like VaOdC was used as an anode material for SIBs. The porous shuttle-like V203/C, which had an inherent layered structure with metallic behavior, exhibited excellent electrochemical properties. Remarkable rate capacities of 417, 247, 202, 176, 164, and 149 mAh.g-1 were achieved at current densities of 50, 100, 200, 500, 1,000, and 2,000 mA.g-1, respectively. Under cycling at 2 A.g-1, the specific discharge capacity reached 181 mAh.g-1, with a low capacity fading rate of 0.032% per cycle after 1,000 cycles. Density functional theory calculation results indicated that Na ions preferred to occupy the interlamination rather than the inside of each layer in the V203. Interestingly, the special layered structure with a skeleton of dumbbell-like V-V bonds and metallic behavior was maintained after the insertion of Na ions, which was beneficial for the cycle performance. We consider that the MOF precursor of MIL-88B （V） can be used to synthesize other porous V-based materials for various applications.

关键词： vanadium oxides,metal-organic frameworks,porous structure,density functional theory（DFT） calculation,sodium-ion batteries

pan-cancer tumor-infiltrating T cells: A great hallmark in cancer immunology research

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Chinese Journal of Cancer Research 2022年第2期34卷 115-116页

作者： anqiang Wang Zhaode Bu Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Center of Gastrointestinal CancerPeking University Cancer Hospital&InstituteBeijing 100142China

As one of the most promising tools for deep analyses of tumor characteristics, single-cell RNA sequencing(sc RNAseq) is well welcomed for the great advantages of analyzing tumor features at single cell levels(1). Howe... 详细信息

关键词： cancer tumor infiltrating

Tuning crystal structure and redox potential of NASICON-type cathodes for sodium-ion batteries

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Nano Research 2020年第12期13卷 3330-3337页

作者： Xuemei Ma Xinxin Cao Yifan Zhou Shan Guo Xiaodong Shi Guozhao Fang Anqiang Pan Bingan Lu Jiang Zhou Shuquan Liang School of Material Science and Engineering Central South UniversityChangsha410083China Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha410083China School of Physics and Electronics Hunan UniversityChangsha410082China

Sodium superionic conductor(NASICON)-type compounds have been regarded as promising cathodes for sodium-ion batteries(SIBs)due to their favorable ionic conductivity and robust structural stability.However,their high cost and relatively low energy density restrict their further practical application,which can be tailored by widening the operating voltages with earth-abundant elements such as Mn.Here,we propose a rational strategy of infusing Mn element in NASICON frameworks with sufficiently mobile sodium ions that enhances the redox voltage and ionic migration activity.The optimized structure of Na3.5Mn0.5V1.5(PO4)3/C is achieved and investigated systematically to be a durable cathode(76.6%capacity retention over 5,000 cycles at 20 C)for SIBs,which exhibits high reversible capacity(113.1 mAh·g^−1 at 0.5 C)with relatively low volume change(7.6%).Importantly,its high-areal-loading and temperature-resistant sodium ion storage properties are evaluated,and the full-cell configuration is demonstrated.This work indicates that this Na3.5Mn0.5V1.5(PO4)3/C composite could be a promising cathode candidate for SIBs.

关键词： sodium superionic conductor(NASICON)-type crystal structure cathode material full cell sodium ion battery

Biodegradable composite polymer as advanced gel electrolyte for quasi-solid-state lithium-metal battery

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eScience 2022年第5期2卷 494-508页

作者： Simin Chai Yangpu Zhang Yijiang Wang Qiong He Shuang Zhou Anqiang Pan School of Material Science and Engineering Central South UniversityChangsha410083HunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha410083HunanChina

The development of low-cost and eco-friendly gel polymer electrolytes (GPEs) with a wide window, ideal compatibility, and structural stability is an effective measure to achieve safe high-energy-density lithium-metal batteries. Herein, a biodegradable composite polyacrylonitrile/poly-L-lactic acid nanofiber membrane (PAL) is synthesized and used as a robust skeleton for GPEs. The 3D nanofiber membrane (PAL-3-C12) prepared with an adjusted weight ratio of polyacrylonitrile (pan)/poly-L-lactic acid (PLLA) and spinning solution concentration delivers decent thermal stability, biodegradability, and liquid electrolyte absorbability. The “passivation effect” of pan upon lithium metal is effectively alleviated by hydrogen bonds formed in the PAL chains. These advantages enable PAL GPEs to work stably to 5.17 V while maintaining high ionic conductivity as well as excellent corrosion resistance and dielectric properties. The interfacial compatibility of optimized GPEs promotes the stable operation of a Li||PAL-3-C12 GPEs||Li symmetric battery for 1000 h at 0.15 mA cm^(−2)/0.15 mA h cm^(−2), and the LiFePO4 full cell retains capacity retention of 97.63% after 140 cycles at 1C.

关键词： 3D nanofiber membrane Polymer membrane skeleton Gel polymer electrolyte Electrospinning method Lithium metal battery

Vanadium-modified hard carbon spheres with sufficient pseudographitic domains as high-performance anode for sodium-ion batteries

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Carbon Energy 2023年第2期5卷 12-23页

作者： Fuping Chen Yujie Di Qiong Su Dongming Xu Yangpu Zhang Shuang Zhou Shuquan Liang Xinxin Cao Anqiang Pan School of Material Science and Engineering Central South UniversityChangshaHunanChina School of Physics and Chemistry Hunan First Normal UniversityChangshaHunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangshaHunanChina

Hard carbons are promising anode materials for sodium-ion batteries.To meet practical requirements,searching for durable and conductive carbon with a stable interface is of great importance.Here,we prepare a series of vanadiummodified hard carbon submicrospheres by using hydrothermal carbonization followed by high-temperature pyrolysis.Significantly,the introduction of vanadium can facilitate the nucleation and uniform growth of carbon spheres and generate abundant V-O-C interface bonds,thus optimizing the reaction kinetic.Meanwhile,the optimized hard carbon spheres modified by vanadium carbide,with sufficient pseudographitic domains,provide more active sites for Na ion migration and storage.As a result,the HC/VC-1300 electrode exhibits excellent Na storage performance,including a high capacity of 420 mAh g^(-1) at 50mA g^(-1) and good rate capability at 1 A g^(-1).This study proposes a new strategy for the synthesis of hard carbon spheres with high tap density and emphasizes the key role of pseudographitic structure for Na storage and interface stabilization.

关键词： anode materials hard carbon sodium-ion batteries stable interface vanadium carbide