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Electrochemical properties of carbon-coated LiFePO_4 and LiFe_(0.98)Mn_(0.02)PO_4 cathode materials synthesized by solid-state reaction

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Rare Metals 2012年第2期31卷 145-149页

作者： lin, Ying Zeng, Baozhi lin, yingbin Li, Xiaowei Zhao, Guiying Zhou, Ting Lai, Heng Huang, Zhigao Department of Physics Fujian Normal University Fuzhou 350007 China

Olivine structured LiFePO 4 /C (lithium iron phosphate) and Mn 2+ -doped LiFe 0.98 Mn 0.02 PO 4 /C powders were synthesized by the solid-state reaction. The effects of manganese partial substitution and different carbon content coating on the surface of LiFePO 4 were considered. The structures and electrochemical properties of the samples were measured by X-ray diffraction (XRD), cyclic voltammetry (CV), charge/discharge tests at different current densities, and electrochemical impedance spectroscopy (EIS). The electrochemical properties of LiFePO 4 cathodes with x wt.% carbon coating (x= 3, 7, 11, 15) at =0.2C, 2C (1C= 170 mAh·g 1 ) between 2.5 and 4.3 V were investigated. The measured results mean that the LiFePO 4 with 7 wt.% carbon coating shows the best rate performance. The discharge capacity of LiFe 0.98 Mn 0.02 PO 4 /C composite is found to be 165 mAh·g 1 at a discharge rate, = 0.2C, and 105 mAh·g 1 at =2C, respectively. After 10 cycles, the discharge capacity has rarely fallen, while that of the pristine LiFePO 4 /C cathode is 150 mAh·g 1 and 98 mAh·g 1 at =0.2 and 2C, respectively. Compared to the discharge capacities of both electrodes above, the evident improvement of the electrochemical performance is observed, which is ascribed to the enhancement of the electronic conductivity and diffusion kinetics by carbon coating and Mn 2+-substitution.

关键词： lithium ion batteries LiFePO 4 carbon coating Mn-doping

Modification of Li_(3)PO_(4) layer effectively boosting lithium storage and thermal safety performance for LiCoO_(2) batteries

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Journal of Energy Chemistry 2024年第12期99卷 615-626页

作者： Weijun Zhang Caifang Qiu Zhongfeiyu lin Guiying Zhao Yingying Liu Pengcheng Wang yingbin lin Zhigao Huang Jiaxin Li College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFujian Normal UniversityFuzhou 350117FujianChina Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117FujianChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117FujianChina

To meet the demand for high-performance LiCoO_(2) batteries,it is necessary to overcome challenges such as interface degradation and rapid capacity degradation caused by changes in bulk structure,especially under deep delithiation and high temperature *** ion conductive coating layer of Li_(3)PO_(4) has been directly modified on the surface of LiCoO_(2) particles using magnetron sputtering method,significantly improving the lithium storage performance of LiCoO_(2)@Li_(3)PO_(4) *** to pure LiCoO_(2),the modified LiCoO_(2) sample exhibits obviously better cycle life and high-temperature ***,under the conditions of 2 and 1 C,the LiCoO_(2)@Li_(3)PO_(4) electrode delivers excellent cycling performance at high voltage of 4.5 V,with capacity retention rates of 89.7%and 75.7%at room temperature and high temperature of 45℃,being far greater than those of 12.3%and 29.1%for bare LiCoO_(2) *** is discovered that the Li_(3)PO_(4) coating layer not only effectively enhances interface compatibility and suppresses the irreversible phase transition of LiCoO_(2),but also further improves the Li^(+)transport kinetics and significantly reduces battery polarization,ultimately enabling the modified LiCoO_(2) electrode to exhibit excellent lithium storage performance and thermal safety characteristics under high voltage ***,such effective modified strategy can undoubtedly provide an important academic inspiration for LiCoO_(2) implication.

关键词： LiCoO_(2)cathode Li_(3)PO_(4)surface modification Electrochemical performance Pouch full battery Thermal safety performance

Boosting the cell performance of the SiO_(x)@C anode material via rational design of a Si-valence gradient

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Carbon Energy 2022年第2期4卷 129-141页

作者： Jianming Tao Zerui Yan Jiangshao Yang Jiaxin Li yingbin lin Zhigao Huang Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center College of Physics and EnergyFujian Normal UniversityFuzhouChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials FuzhouChina Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering FuzhouChina

Relieving the stress or strain associated with volume change is highly desirable for high-performance SiOx anodes in terms of stable solid electrolyte interphase(SEI)-film ***,a Si-valence gradient is optimized in SiOx composites to circumvent the large volume strain accompanied by lithium insertion/***_(x)@C annealed at 850℃ has a gentle Si-valence gradient along the radial direction and excellent electrochemical performances,delivering a high capacity of 506.9 mAh g^(−1) at 1.0 A g^(−1) with a high Coulombic efficiency of~99.8%over 400 *** with the theoretical prediction,the obtained results indicate that the gentle Si-valence gradient in SiO_(x)@C is useful for suppressing plastic deformation and maintaining the inner connection integrity within the SiO_(x)@C ***,a gentle Si-valence gradient is expected to form a stress gradient and affect the distribution of dangling bonds,resulting in local stress relief during the lithiation/delithiation process and enhanced Li-ion kinetic ***,the lowest interfacial stress variation ensures a stable SEI film at the interface and consequently increases cycling ***,rational design of a Si-valence gradient in SiOx can provide further insights into achieving high-performance SiOx anodes with large-scale production.

关键词： lithium-ion battery SEI film growth SiO_(x)@C stress valence gradient

Boosting K-ion kinetics by interfacial polarization induced by amorphous MoO_(3-x)for MoSe_(2)/MoO_(3-x)@rGO composites

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Journal of Materials Science & Technology 2022年第20期115卷 232-240页

作者： Jiangshao Yang Liwen Liu Daoyi Wang Jianming Tao Yanming Yang Jiaxin Li yingbin lin Zhigao Huang College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China

Promoting interfacial reaction kinetics is highly desirable for achieving high-performances of anode material in alkali-ion ***,flower-like MoSe_(2)/MoO_(3-x)@r GO composites are fabricated by a facile solvothermal method involving a thermal-treatment at 800°*** evaluated as an anode material for potassium ion batteries,MoSe_(2)/MoO_(3-x)@r GO delivers 248.2 m A h g^(-1)after 50 cycles at 0.2 A g^(-1) with a capacity retention of 84.6%and 182.9 m A h g^(-1)after 150 cycles at 1.0 A g^(-1) with a capacity retention of almost 61.2%,superior to those of bare MoSe_(2)or MoSe_(2)@r GO *** from electrochemical measurements,the amorphous MoO_(3-x)containing oxygen vacancies could not only effectively buffer the self-aggregation of MoSe_(2)nanosheets but also provides lots of accessible active sites for potassium ion ***,the open channels in the amorphous MoO_(3-x) phase lead to easier ion hopping and smaller diffusion ***,the built-in electric field at the interface would be beneficial for electron transfer and K-ion migration across the hetero-junction ***,larger dielectric polarization induced by the high relative permittivity of amorphous MoO_(3-x) would reduce charge transfer resistance and enhance K-ion migration across electric *** work provides new insight into the enhanced performance of anode material coated by an amorphous layer with large relative permittivity.

关键词： Potassium ion batteries MoSe_(2) Amorphous Work function Heterojunction interface

Enhancing interfacial Li+transport and dielectric properties in poly(ethylene oxide)-based all-solid electrolytes via inactive g-C_(3)N_(4)nanosheets filler incorporation

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Journal of Materials Science & Technology 2024年第16期183卷 184-192页

作者： Zhixuan Li Weijian Zhang Yue Chen Qiaoquan lin Long Zhang Jianming Tao Oleg V.Kolosov Jiaxin Li yingbin lin Zhigao Huang College of Physics and Energy Fujian Normal UniversityFujian Provincial Key Laboratory of Quantum Manipulation and New Energy MaterialsFuzhou 350117China Fujian Provincial Engineering Technical Research Centre of Solar-Energy Conversion and Stored Energy Fuzhou 350117China Fujian Provincial Collaborative Innovation Centre for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China Physics Department Lancaster UniversityLancaster LA14YBUK The Faraday Institution Quad OneBecquerel AvenueHarwell CampusDidcotOX110RAUK

The advancement of all-solid-state Li metal batteries(ASSLMBs)faces a major challenge in the growth of lithium dendrites on the anode-electrolyte *** this study,we propose a dual-filler approach using poly(ethylene oxide)(PEO)-based solid polymer electrolytes(SPEs)that combine Li_(1.4)Al_(0.4)Ti_(1.6)(PO_(4))_(3)(LATP)ion-conductive particles with graphitic carbon nitride(g-C_(3)N_(4))*** through sec-ond harmonic resonance enhanced electrostatic force microscopy and critical current density(CCD)tests reveal that the g-C_(3)N_(4)additives form nano-capacitors at the SPE-lithium interface,effectively reducing sudden changes in current *** distribution of relaxation time constant(DRT)measurements confirms that the g-C_(3)N_(4)filler suppresses uncontrolled Li dendrite growth,effectively mitigating battery aging caused by anode interfacial ***,X-ray photoelectron spectroscopy(XPS)anal-ysis indicates that the nitrogen-containing organic groups in g-C_(3)N_(4)are reduced to form a stable interfa-cial layer with lithium *** a result of these enhancements,the electrolyte demonstrates remarkable interfacial stability in Li/Li symmetrical cells at 0.65 mA/cm2 and delivers promising performance in assembled Li-LiFePO4 batteries,achieving a reversible capacity of 121.6 mAh/g at 1 C after 200 *** findings highlight the potential of dual-filler PEO-based SPEs for promoting interfacial lithium-ion transport in all-solid-state Li metal batteries.

关键词： Lithium metal anode Lithium dendrite Dielectric force microscopy All-solid-state electrolyte Lithium ion batteries

Scalable synthesized high-performance TiO_(2)-Si-C hybrid anode for lithium batteries

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Journal of Energy Chemistry 2023年第2期77卷 348-358,I0009页

作者： Liao Shen Chengjie Xu Jingguo Gao Jianming Tao Qiaobao Zhang Yue Chen yingbin lin Zhigao Huang Jiaxin Li College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFujian Normal UniversityFuzhou 350117FujianChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117FujianChina Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117FujianChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina

At present,developing a simple strategy to effectively solve the shackles of volume expansion,poor conductivity and interface compatibility faced by Si-C anode in lithium batteries(LIBs)is the key to its ***,low-cost nano-Si powders were prepared from Si-waste of solar-cells by sanding treatment,which can effectively reduce the commercialization cost for Si-C ***,micro-nano structured Gr@Si/C/TiO_(2) anode materials with graphite(Gr)as the inner core,TiO_(2)-doped and carbon-coated Si as the outer coating-layer,were synthesized at kilogram-scale per milling *** characterization results indicate that TiO_(2)-doped carbon layer can improve the interface compatibility with the electrolyte,further promote the reduction of electrode polarization,and finally enhance the battery performance for the Gr@Si/C/TiO_(2) ***,Gr@Si/C/TiO_(2) composites can output excellent LIB performance,especially with high initial coulombic efficiency(ICE)of 82.51%and large average reversible capacity of~810 mA h g^(-1) at 0.8 A g^(-1) after 1000 ***,Gr@Si/C/TiO_(2)‖NCM811 pouch full cells deliver impressive performance especially with high energy density of~489.3 W h kg^(-1) based on the total weight of active materials,suggesting its promising application in the high performance LIBs.

关键词： Lithium-ion batteries Si-C anodes Kilogram-scale preparation Interface compatibility Electrochemical mechanism

Easily Obtaining Excellent Performance High-voltage LiCoO_(2)via Pr_(6)O_(11)Modification

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Energy & Environmental Materials 2023年第2期6卷 34-44页

作者： Yongcong Huang Chenjie Xu Jingguo Gao Liao Shen Qian Liu Guiying Zhao Qingshui Xie yingbin lin Jiaxin Li Zhigao Huang College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFujian Normal UniversityFuzhou 350117China Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China State Key Laboratory for Physical Chemistry of Solid Surfaces Fujian Key Laboratory of Materials GenomeCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China

Developing an effective method to synthesize high-performance high-voltage LiCoO_(2) is essential for its industrialization in lithium batteries(LIBs).This work proposes a simple mass-produced strategy for the first time,that is,negative temperature coefficient thermosensitive Pr_(6)O_(11) nanoparticles are uniformly modified on LiCoO_(2) to prepare LiCoO_(2)@Pr_(6)O_(11)(LCO@PrO)via a liquid-phase mixing combined with annealing *** at 274 mA g−1,the modified LCO@PrO electrodes deliver excellent 4.5 V high-voltage cycling performance with capacity retention ratios of 90.8%and 80.5%at 25 and 60℃,being much larger than those of 22.8%and 63.2%for bare LCO *** effective strategies were used to clearly unveil the performance enhancement mechanism induced by Pr_(6)O_(11) *** is discovered that Pr_(6)O_(11) can improve interface compatibility,exhibit improved conductivity at elevated temperature,thus enhance the Li^(+)diffusion kinetics,and suppress the phase transformation of LCO and its resulting mechanical *** 450 mAh LCO@PrO‖graphite pouch cells show excellent LIB performance and improved thermal safety ***,the energy density of such pouch cell was increased even by~42%at 5 *** extremely convenient technology is feasible for producing high-energy density LIBs with negligible cost increase,undoubtedly providing important academic inspiration for industrialization.

关键词： high-voltage LiCoO_(2) pouch cell Pr_(6)O_(11)modification simple massproduction thermal safety

Studies on Pervaporation Separation of Ethanol/Water Mixtures with Membranes of Polypropylene Sulfonate Salts

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Chemical Research in Chinese Universities 1990年第4期6卷 386-390页

作者： lin Shaokun, Xu yingbin and lin Shangan (Institute of Polymer Science, Zhongshan University, Guangzhou, 510275)

Sulfonated polypropylene membranes loaded with different kinds of counter-ions were prepared by heterogeneous chiorosulfonation reaction of polypropylene membrane followed by hydrolysis and ion-exchange reaction. The membranes obtained were used for selective separation of ethanol/water mixtures by pervaporation. The effects of counter-ion species, ion-exchange capacity, solution composition, thickness of membrane and temperature on the separation behavior of the membranes were investigated. Microstructure and morphology of the membranes were examined by X-ray and SEM as well.

关键词： Pervaporation separation Membranes Polypropylene sulfonate

Unraveling the evolution of Cathode-Solid electrolyte interface using operando X-ray Photoelectron spectroscopy

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Advanced Powder Materials

Advanced Powder Materials 2024年第3期3卷 48-55页

作者： Wenhao Zhong Jianming Tao Yue Chen Richard G.White Long Zhang Jiaxin Li Zhigao Huang yingbin lin College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fuzhou 350117China Thermo Fisher Scientific Imberhorne LaneEast GrinsteadWest SussexRH191UBUK

Understanding the evolution of the solid electrolyte-electrode interface is currently one of the most challenging obstacles in the development of solid-state batteries(SSBs).Here,we develop an X-ray Photoelectron Spectroscopy(XPS)that allows for operando measurement during *** on theoretical analysis and the modulated electrode and detector co-grounding mode,the displacement of binding energy can be correlated with the surface electrostatic potential of the material,revealing the charge distribution and composition evolution of the space charge layer between the cathode and the *** the investigation of typical LiCoO_(2)(LCO)/Li6PS5Cl(LPSC)/Li-In batteries,we observed the static potential difference and oxidative decomposition between LPSC and LCO,and the effectiveness of the linbO3 coating in reducing potential difference and inhibiting the diffusion of Co and oxidation of S ***,our study also revealed that the potential drop between lini0⋅8Co0⋅1Mn0⋅1O_(2) and LPSC is smaller than that of LCO,whilst that between Li3InCl6 and LCO remains near *** proposed operando XPS method offers a novel approach for real-time monitoring of interface potential and species formation,providing rational guidance for the interface engineering in SSBs.

关键词： Solid-state batteries Space charge layer X-ray photoelectron spectroscopy Cathode Solid electrolyte