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Bimetallic CoNiSe_(2)/C nanosphere anodes derived from Ni-Co-metal-organic framework precursor towards higher lithium storage capacity

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Chinese Chemical Letters 2023年第2期34卷 534-541页

作者： Weifan Zhang Lei Wang Guochun Ding Yuejia Yang Guang Yang Jing Xu Ningning Xu Lingling Xie Qing Han Limin Zhu Xiaoyu Cao Jianmin Ma School of Chemistry and Chemical Engineering Henan University of TechnologyZhengzhou 450001China School of Environmental Engineering Henan University of TechnologyZhengzhou 450001China Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City Henan University of TechnologyZhengzhou 450001China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

Through uncomplicated carbonation process,a carbon-embedded CoNiSe_(2)/C nanosphere was synthesized from Ni-Co-MOF (metal-organic framework) precursor whose controllable structure and synergistic effect of bimetallic Ni/Co brought CoNiSe_(2)/C anodes with high specific surface area (172.79 m^(2)/g) and outstanding electrochemical ***_(2)/C anodes obtained reversible discharge capacities of850.9 mAh/g at 0.1 A/g after cycling for 100 *** addition,CoNiSe_(2)/C exhibits excellent cycle stability and reversibility in the rate test at a current density of 0.1–2.0 A/*** the current density returns to 0.5 A/g for 150 cycles,its discharge ratio the capacity is 330.8 m Ah/*** impedance spectroscopy (EIS) tests suggested that CoNiSe_(2)/C anodes had a lower charge transfer impedance of 130.02Ωafter 30 ***-situ X-ray diffraction (XRD) tests confirmed the alloying mechanism of CoNiSe_(2)/C which realized higher lithium storage *** work affords substantial evidence for the extension of bimetallic selenides in secondary batteries,promoting the development of bimetallic selenides in anode materials for LIBs.

关键词： MOFs Bimetallic compound CoNiSe_(2)/C anode nanosphere lithium-ion batteries lithium storage performance

Ge nanoparticles uniformly immobilized on 3D interconnected porous graphene frameworks as anodes for high-performance lithium-ion batteries

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Journal of Energy Chemistry 2022年第6期31卷 161-173,I0005页

作者： Yao Chen Yuming Zou Xiaoping Shen Jingxia Qiu Jiabiao Lian Jinrui Pu Sheng Li Fei-Hu Du Shang-Qi Li Zhenyuan Ji Aihua Yuan School of Material Science and Engineering School of Chemistry and Chemical EngineeringInstitute for Energy ResearchJiangsu UniversityZhenjiang 212013JiangsuChina School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China School of Environmental&Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

Germanium(Ge), an alloy-type anode material for lithium-ion batteries(LIBs), possesses many advantages such as high theoretical capacity and decent electrical conductivity. Nevertheless, its application is restricted by tremendous volume variation and tardy reaction kinetic during discharge/charge *** this paper, the Ge/3DPG composites with Ge nanoparticles uniformly dispersed in 3D interconnected porous graphene(3DPG) skeleton are successfully prepared using a template-assisted in-situ reduction method. The unique 3D interconnected porous graphene can not only enhance the electronic conductivity and reaction kinetics of the materials, but also provide sufficient buffer space to effectively mitigate the volume expansion during cycling and strengthen the structural integrity. Moreover, the small-sized Ge nanoparticles in close conjunction with the 3D graphene can boost the surface-controlled reaction of the electrode, which contributes to a fast charge–discharge rate capability. The Ge/3DPG composite with optimized Ge/graphene mass ratio delivers high reversible specific capacity(1102 mAh g^(-1) after 100 cycles at 0.2 C), outstanding rate capability(494 mAh g^(-1) at 5 C), and admirable cycling stability(85.3% of capacity retention after 250 cycles at 0.5 C). This work provides a significant inspiration for the design and fabrication of advanced Ge-based anode materials for next-generation highperformance LIBs.

关键词： Germanium nanoparticles 3D porous graphene Composites Anode materials lithium storage performance

Metal oxyacid salts-confined pyrolysis towards hierarchical porous metal oxide@carbon(MO@C)composites as lithium-ion battery anodes

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Nano Research 2023年第5期16卷 6903-6913页

作者： Huizhong Xu Chang Gao Zhaoyang Cheng Linghui Kong Wei Li Xiaochen Dong Jianjian Lin Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science Ministry of Education(MOE)Shandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Engineering Research Center of High performance Polymer and Molding Technology Ministry of EducationQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211800China

Transition metal oxides(TMOs)have been thought of potential anodic materials for lithium-ion batteries(LIBs)owing to their intriguing ***,the limited conductivity and drastic volume change still hinder their practical ***,a metal oxyacid salts-confined pyrolysis strategy is proposed to construct hierarchical porous metal oxide@carbon(MO@C,MO=MoO_(2),V_(2)O_(5),WO_(3))composites for solving the aforementioned problems.A water-evaporation-induced self-assembly mechanism has been put forward for fabricating the MO@polyvinyl pyrrolidone(PVP)@SiO_(2)*** the following pyrolysis and etching process,small MO nanoparticles can be successfully encapsulated in the hierarchical porous carbon *** from the synergistic effect of MO nanoparticles and highly conductive carbon framework,MO@C composites show excellent electrochemical *** example,the as-obtained MoO_(2)@C composite exhibits a large discharge capacity(1513.7 mAh·g^(−1)at 0.1 A·g^(−1)),good rate ability(443.5 mAh·g^(−1)at 5.0 A·g^(−1)),supernal long-lived stability(669.1 mAh·g^(−1)after 1000 cycles at 1.0 A·g^(−1)).This work will inspire the design of novel anode materials for high-performance LIBs.

关键词： transition metal oxides hierarchical porous carbon framework anode materials lithium storage performance

Self-template synthesis of peapod-like MnO@N-doped hollow carbon nanotubes as an advanced anode for lithium-ion batteries

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Rare Metals 2023年第3期42卷 929-939页

作者： Yan-Ping Liu Chen-Xi Xu Wen-Qing Ren Li-Ying Hu Wen-Bin Fu Wei Wang Hong Yin Bin-Hong He Zhao-Hui Hou Liang Chen Key Laboratory of Hunan Province for Advanced Carbon-Based Functional Materials School of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyang 414006China College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta 30332USA

The exploration of low-cost and high-performance transition metal oxides/carbon(TMOs/C)-based anodes to replace commercial graphite is still a huge challenge for the development of lithium-ion batteries(LIBs).In this work,MnO@N-doped hollow carbon nanotubes(MnO@NHCNT-v,v refers to the adding volume of pyrrole)hybrids are successfully prepared by a facile selftemplate strategy using Mn3O4 nanotubes(Mn3O4 NT)and pyrrole(PY)as the *** morphology,structure and composition of these MnO@NHCNT-v samples are systematically *** the effect of PY adding amounts on the synthesis of MnO@NHCNT-v samples is also *** results show that the Mn_(3)O_(4) NT works as a self-template,which releases Mn3+and guides the growth of polypyrrole(PPY)on Mn_(3)O_(4) ***,it is demonstrated that the synthesis of MnO@NHCNTv hybrids can be well regulated by the added PY *** a result,MnO@NHCNT-1 hybrid not only makes a good balance on the proportion of MnO and carbon matrix but also simultaneously obtains unique peapod-like structure and successful N doping in NHCNT,resulting in good electrical contact between the two components,enhanced chemical binding by Mn-N-C bonds and enough void space inside its *** from these merits,the resulting MnO@NHCNT-1 hybrid exhibits outstanding cycling stability and rate capability when used as a LIBs *** work offers a good guidance on the design and preparation of low-price and high-performance TMOs/C-based LIBs anodes.

关键词： Self-template strategy Peapod-like structure N doping MnO@N-doped hollow carbon nanotubes(MnO@NHCNT) lithium storage performance

A novel Mo-based oxide β-SnMoO4 as anode for lithium ion battery

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Chinese Chemical Letters 2020年第1期31卷 210-216页

作者： Huiwen Zheng Hailin Zhang Yu Fan Ge Ju Hongbin Zhao Jianhui Fang Jiujun Zhang Jiaqiang Xu NEST Lab Department of ChemistryCollege of SciencesShanghai UniversityShanghai 200444China College of Sciences&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China Shanghai CENAT New Energy Co. Ltd.Shanghai 201815China

Recently,the development of new electrode materials for lithium-ion batteries(LIBs)has received intensive *** an important family of inorganic materials,mixed Mo-based transition metal oxides system is focused as anode *** the present work,a simple route has been adopted for the synthesis of layered-flake-likeβ-SnMo04 Nano-assemblies,which have been explored as potential anode materials for the first time in lithium-ion battery(LIB).Overall,the current reports on metal molybdate as anode materials are still *** the anode material for LIBs,it was observed that the fabricated anode is capable of delivering a steady state capacity of almost 400 mAh/g up to 300 cycles under the influence of200 mA/g current ***,the anode material is suitable for use as a rated capacity anode because of its high current density *** present study can be further extended for the generation of a wide variety of other novel materials for multidisciplinary energy related applications.

关键词： β-SnMoO4 nanomaterials Nanoflake structure lithium storage performance Novel anode material LIBs

Boosting the high-rate performance and cycling life of NaTi_(2)(PO_(4))_(3) anode by forming N-doped carbon coating derived from polyacrylonitrile

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ChemPhysMater 2023年第4期2卷 315-322页

作者： Huan Yang Zhongnian Yang Yujun Bai Wenjing Du Yuheng Wang Jiru Xian Department of Chemical Engineering and Safety Binzhou UniversityBinzhou 256603China Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250061China Henan Key Laboratory of Electronic Ceramic Materials and Application Henan Engineering Laboratory of Functional Inorganic Nonmetallic MaterialsCollege of Materials EngineeringHenan University of EngineeringZhengzhou 451191China

Poor electron conductivity is the key issue influencing the rate capability of NaTi_(2)(PO_(4))_(3)(NTP).Hence,herein,polyacrylonitrile(PAN)was utilized as a NTP modifier by simply mixing NTP in a liquid PAN suspension,followed by sintering at 850℃ for 5 *** product with a PAN/NTP mass ratio of 0.3 delivered splendid rate capabilities(achieving lithiation capacities of 282.9,243.0,207.1,173.1,133.5,and 257.5 mAh g^(−1) at 0.1,0.2,0.4,0.8,1.6,and 0.1 A^(−1),respectively)and excellent long cycling life(capacity retention of 165.5 mAh g^(−1) after 1200 cycles at 0.5 A g−1).Based on detailed structural and compositional characterizations,as well as cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS),the uniform N-doped carbon coating stemming from PAN carbonization around the NTP particles promoted electron transfer,while the oxygen vacancies induced by N-doping in NTP facilitated Li+*** boosted and well matched electronic and ionic conductivities give rise to the optimized electrochemical performance.

关键词： NaTi_(2)(PO_(4))_(3) Carbon coating N-doping Polyacrylonitrile lithium storage performance