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Effects of polydopamine modification on self-grown Cu O cube anodes in lithium-ion batteries

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Science China(Technological Sciences) 2016年第4期59卷 667-672,1-4页

作者： HAO LiHua WU LiQiong JIA ZhiQi ZHAO YongXiang LI XinHeng College of Chemistry and Chemical Engineering Shanxi University State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research Institute of LICP Lanzhou Institute of Chemical Physics (LICP)

We report the synthesis of Cut cubes with well-defined size and shape by thermal treatments of Cu2O cubes. Polydopamine （PDA） is introduced to modify the Cut cubes by the in-situ polymerization of the dopamine precursor. The initial specific ca- pacity of the lithium-ion batteries using the Cut cubes as anodes increases about 10 times at a 0.5 C rate as a result of the modification of PDA. The overall specific capacity for 100 cycles also increases effectively due to the introduction of PDA. So PDA as surface modifying agent significantly improves the electrochemical performance of the Cut anodes.

关键词： lithium anode materials copper oxides polydopamine modification specific capacity in-situ polymerization

Effect of strain on electrochemical performance of Janus MoSSe monolayer anode material for Li-ion batteries: First-principles study

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Chinese Physics B 2021年第4期30卷 394-401页

作者： Guoqing Wang Wenjing Qin Jing Shi Department of Physics Jiangxi Normal UniversityNanchang 330022China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

First-principles calculations are performed to investigate the effect of strain on the electrochemical performance of Janus MoSSe *** calculation focuses on the specific capacity,intercalation potential,electronic structure,and migration behavior of Li-ion under various strains by using the climbing-image nudged elastic band *** result shows that the specific capacity is nearly unchanged under *** interestingly,the tensile strain can cause the intercalation potential and Li-ion migration energy barrier increase in MoSSe monolayer,whereas the compressive strain can lead to the intercalation potential and energy barrier ***,the rate performance of the MoSSe anode is *** analyzing the potential energy surface of MoSSe surface and equilibrium adsorption distance of Li-ion,we explain the physical origin of the change in the intercalation potential and migration energy *** increase of MoSSe potential energy surface and the decrease of adsorption distance caused by tensile strain are the main reason that hinders Li-ion migration.

关键词： Janus Mo SSe monolayer strain effect specific capacity migration behavior

Electrochemical performance of nickel hydroxide doped with multi-wall carbon nanotubes

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 249-252页

作者：李延伟尹周澜姚金环赵卫民刘长久钟胜奎 School of Chemistry and Chemical Engineering Central South University College of Chemistry and Bioengineering Guilin University of Technology

Nickel hydroxide doped with multi-wall carbon nanotubes(MCNTs)was synthesized by chemical coprecipitation method. The MCNTs doped nickel hydroxide was used as the electrochemical active material in the positive electrodes of rechargeable alkaline *** powder X-ray diffraction(XRD)analysis shows that the addition of MCNTs induces more structural defect within the crystal lattice of the nickel *** cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS) tests demonstrate the better reaction reversibility and lower electrochemical impedance of MCNTs doped nickel hydroxide as compared with the pure nickel *** charge/discharge tests show that MCNTs addition can improve the specific discharge capacity and increase the discharge voltage of the nickel hydroxide electrode.

关键词： nickel hydroxide carbon nanotube Ni/MH batteries specific capacity electrochemical impedance spectroscopy

Lithium-ion modified cellulose as a water-soluble binder for Li-O2 battery

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Frontiers in Energy 2022年第3期16卷 502-508页

作者： Chenyi Hu Aiming Wu Fengjuan Zhu Liuxuan Luo Fan Yang Guofeng Xia Guanghua Wei Shuiyun Shen Junliang Zhang Institute of Fuel Cells School of Mechanical EngineeringMOE Key Laboratory of Power and Machinery EngineeringShanghai Jiao Tong UniversityShanghai200240China SJTU-Paris Tech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai200240China

An environment-friendly,water-soluble,and cellulose based binder(lithium carboxymethyl cellulose,CMC-Li)was successfully synthesized by using Li+to replace Na+in the commercial sodium carboxymethyl cellulose(CMC-Na).Li-O2 batteries based on the CMC-Li binder present enhanced discharge specific capacities(11151 mAh/g at 100 mA/g)and a superior cycling stability(100 cycles at 200 mA/g)compared with those based on the CMC-Na *** enhanced performance may originate from the electrochemical stability of the CMC-Li binder and the ion-conductive nature of CMC-Li,which promotes the diffusion of Li+in the cathode and consequently retards the increase of charge transfer resistance of the cathode during *** results show that the water-soluble CMC-Li binder can be a green substitute for poly(vinylidene fluoride)(PVDF)binder based on organic solvent in the lithium oxygen batteries(LOBs).

关键词： cellulose binder specific capacity cyclability lithium-oxygen batteries

Improving the charge kinetics through in-situ growth of NiSe nanoparticles on g-C_(3)N_(4)nanosheets for efficient hybrid supercapacitors

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Journal of Energy Chemistry 2023年第12期87卷 304-313,I0008页

作者： Somnath R.Khaladkar Oshnik Maurya Girish Gund Bhavesh Sinha Deepak Dubal R.R.Deshmukh Archana Kalekar Department of Physics Institute of Chemical Technology(ICT)MatungaMumbai 400019MaharashtraIndia Department of Physics Mahatma Phule ArtsScience and Commerce CollegePanvel 410206MaharashtraIndia National Center for Nanoscience and Nanotechnology University of MumbaiMumbai 400032MaharashtraIndia Centre for Materials Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbane QLD 4000Australia

Nickel selenide(NiSe)has been a promising positive electrode for hybrid supercapacitors due to its multiple oxidation states,tunability,and high specific ***,sluggish ion transfers and particle agglomeration hamper its electrochemical *** the present study,we have grown NiSe nanoparticles on two-dimensional(2D)graphitic carbon nitride(g-C_(3)N_(4))nanosheets to realize three-dimensional(3D)*** 2D support,high nitrogen content,and features of g-C_(3)N_(4)enhanced the specific capacity of the NiSe/g-C_(3)N_(4)nanocomposite *** resulting nanocomposite shows a specific capacity of 320 mA h g^(-1)at a current density of 1 A g^(-1),which is considerably higher than pristine ***,the hybrid supercapacitor(HSC)device was fabricated using NiSe/g-C_(3)N_(4)composite as positive and activated carbon(AC)as negative *** cell delivered an energy density of 52.5 Wh kg^(-1)at a power density of 1488 W kg^(-1)with excellent cyclic stability of 84.9%over 8000 *** electrochemical performance enhancement corresponds to a 3D structure,high electrochemical active sites,and improved charge transportation at the electrode/electrolyte ***,the present work offers an easy approach and architectural design for high-performance HSC.

关键词： Nickel selenide Graphitic carbon nitride Nanocomposite specific capacity Hybrid supercapacitor

Durable K-ion batteries with 100% capacity retention up to 40,000 cycles

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Carbon Energy 2024年第5期6卷 201-212页

作者： Xianlu Lu Zhao Liang Zhi Fang Dongdong Zhang Yapeng Zheng Qiao Liu Dingfa Fu Jie Teng Weiyou Yang Institute of Micro/Nano Materials and Devices Ningbo University of TechnologyNingboZhejiangChina College of Materials Science and Engineering Hunan UniversityChangshaChina College of Mechanical and Vehicle Engineering Hunan UniversityChangshaChina

Currently,the major challenge in terms of research on K-ion batteries is to ensure that they possess satisfactory cycle stability and specific capacity,especially in terms of the intrinsically sluggish kinetics induced by the large radius of K+***,we explore high-performance K-ion half/full batteries with high rate capability,high specific capacity,and extremely durable cycle stability based on carbon nanosheets with tailored N dopants,which can alleviate the change of volume,increase electronic conductivity,and enhance the K+ion *** as-assembled K-ion half-batteries show an excellent rate capability of 468 mA h g^(−1) at 100 mA g^(−1),which is superior to those of most carbon materials reported to ***,the as-assembled half-cells have an outstanding life span,running 40,000 cycles over 8 months with a specific capacity retention of 100%at a high current density of 2000 mA g^(−1),and the target full cells deliver a high reversible specific capacity of 146 mA h g^(−1) after 2000 cycles over 2 months,with a specific capacity retention of 113%at a high current density of 500 mA g^(−1),both of which are state of the art in the field of K-ion *** study might provide some insights into and potential avenues for exploration of advanced K-ion batteries with durable stability for practical applications.

关键词： carbon nanosheet cycle stability K-ion batteries rate performance specific capacity

Stabilizing surface chemistry and texture of single-crystal Ni-rich cathodes for Li-ion batteries

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Journal of Materials Science & Technology 2022年第30期125卷 192-197页

作者： Zhaofeng Yang Ling Chen Huawei Zhu Yihua Zhu Hao Jiang Chunzhong Li Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

The single-crystalline Ni-rich cathodes are believed to help improve the safety of Li-ion batteries(LIBs),however,the ion-diffusion limits their high-rate performance owing to large single-crystal ***,a dual-modification strategy of surface Li_(2)TiO_(3)-coating and bulk Ti-doping has been performed to achieve high-rate single crystal LiNi_(0.83)Co_(0.12)Mn_(0.05)O_(2)(NCM)*** Li-ion conductive Li_(2)TiO_(3) coating layer facilitates the Li-ion transfer and prevents the electrolyte ***,the robust Ti-O bonds stabilize the cubic close-packed oxygen framework and mitigate the Li/Ni *** synergy endows the dual-modified NCM with enhanced de-/lithiation reaction kinetics and stable surface chemistry.A high specific capacity of 128 mAh g^(-1) is delivered even at 10 C with an extended cycle *** finding is reckoned to pave the way for developing high energy density LIBs for long-range electric vehicles.

关键词： NCM811 Single-crystal Dual-modification specific capacity Li-ion batteries

Electrochemical properties of vanadium pentoxide xerogel films

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Journal of Central South University of Technology 2005年第5期12卷 561-566页

作者：张勇胡信国刘玉文程玉山 Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China 2. Jiangmen JJJ Battery Co Ltd Jiangmen 529000 China Jiangmen JJJ Battery Co Ltd Jiangmen 529000 China

Vanadium pentoxide xerogel（VXG） films were prepared by rapid quenching, then corn type 2016 size lithium rechargeable batteries were assembled and tested with the VXG film electrodes and lithium anodes. Electrochemical impedance spectroscopy（EIS） analysis result reveals the expected response for intercalation, except that there is almost no Warburg （diffusion） component. Analyses results of cyclic voltammetry（CV）, constant discharge （CD） and discharge-charge（DC） indicate that the sample achieves a high initial discharge specific capacity of approximate 400 mA·h/g and a corresponding efficiency of 97 % in the voltage diapason of 1.5 - 4.0 V with a draining current of 60 mA/g. Its preservation ratio of capacity still keeps as high as 85 % even after 100 cycles. The good electrochemical performance indicates that VXG film material is a promising cathode for lithium rechargeable batteries.

关键词： vanadium pentoxide xerogel films electrochemical impedance spectroscopy specific capacity lithium rechargeable batteries

Effect of lead foam grid on performance of lead-acid battery

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Journal of Harbin Institute of Technology(New Series) 2005年第1期12卷 95-100页

作者：戴长松王殿龙胡信国姜兆华阎志刚 Dept. of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Shuang Deng Power Sources Group.Co.Ltd. Nanjing 210016 China

In order to increase the specific energy and specific power of a lead-acid battery, lead foam grid was prepared by electrodepositing Pb-Sn alloy on a copper foam substrate and used as negative current collector for a lead acid battery whose capacity was limited by the negative plate. Comparing the effect of the cast grid, under the same conditions, the mass of lead foam grid decreases by 35%, and the area of lead foam contacted with active material increases by about 20 times. Under 2 h rate discharge condition, with a high current （3 0 I2） e and low-temperature （-10 ℃, I2） discharge system, the lead foam grid markedly boosts the discharge performance of lead acid battery. It increases not only the negative electrode mass specific capacity by 27%,37% and 29%,but also the utilization efficiency of the negative active material by 5%. Compared with the negative electrode of cast grid, XRD and SEM results show that after 20 cycles at the state of charge, the sponge lead in the negative lead foam electrode has smaller crystals and less PbSO4 on its surface. Meanwhile, at the state of full discharge, the PbSO4 crystals are smaller and occur less on the surface of lead foam electrode. This indicates its active material reacts more uniformly.

关键词： lead acid battery negative active material grid material lead foam specific capacity