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海南省智慧养老发展现状、问题及其对策

经济研究导刊 2024年第6期 105-108页

作者：涂艳谢丽菁唐建荣海南经贸职业技术学院海口571127 海南大学应用科技学院海南儋州571737

智慧养老作为新兴的养老服务形式,具有良好的发展前景。海南省智慧养老市场潜力较大,有关政策正逐步完善,依托自由贸易港发展良机和政策试点,智慧养老动力强劲。但同时也面临服务体系不完善、产品供需存在偏差、制度环境待优化以及发展... 详细信息

智慧养老作为新兴的养老服务形式,具有良好的发展前景。海南省智慧养老市场潜力较大,有关政策正逐步完善,依托自由贸易港发展良机和政策试点,智慧养老动力强劲。但同时也面临服务体系不完善、产品供需存在偏差、制度环境待优化以及发展阶段需要进阶等问题。针对这些问题,提出了健全服务体系、畅通沟通渠道、完善政策措施、提升老龄事业发展质量等建议。

关键词：海南自贸港智慧养老智慧养老产品线上平台人才队伍

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Utilizing the capacity below 0 V to maximize lithium storage of hard carbon anodes

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Particuology 2023年第12期83卷 169-177页

作者： Qianlei Liu Liqin Dai lijing xie Zonglin Yi Mingxin Song Yafeng Fan Guohua Sun Fangyuan Su Cheng-Meng Chen CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China University of Chinese Academy of Sciences Beijing100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Compared with conventional graphite anode,hard carbons have the potential to make reversible lithium storage below 0 V accessible due to the formation of dendrites is ***,under certain conditions of high currents and lithiation depths,the irreversible plated lithium occurs and then results in the capacity ***,we systematically explore the true reversibility of hard carbon anodes below 0 *** identify the lithiation boundary parameters that control the reversible capacity of hard carbon *** the boundary capacity is controlled below 400 mAh g−1 with current density below 50 mA g−1,no lithium dendrites are observed during the lithiation *** with the discharge cut-off voltage to 0 V,this boundary provides a nearly twice reversible capacity with the capacity retention of 80%after 172 *** results of characterization and finite element model reveal that the large reversible capacity below 0 V of hard carbon anodes is mainly benefited from the dual effect of lithium intercalation and reversible lithium *** the lithium intercalation,the over-lithiation induces the quick growth of lithium dendrites,worsening the electrochemical *** work enables insights of the potentially low-voltage performance of hard carbons in lithium-ion batteries.

关键词： Low voltage Li intercalation Reversible capacity Li dendrites Hard carbon

Cellulose nanofiber separator for suppressing shuttle effect and Li dendrite formation in lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第4期31卷 736-744页

作者： Jingxue Li Liqin Dai Zhefan Wang Hao Wang lijing xie Jingpeng Chen Chong Yan Hong Yuan Hongliang Wang Chengmeng Chen Center of Biomass Engineering/College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

Lithium-sulfur battery(LSB) has high energy density but is limited by the polysulfides shuttle and dendrite growth during cycling. Herein, a free-standing cellulose nanofiber(CNF) separator is designed and fabricated in isopropanol/water suspension through vacuum filtration progress. CNFs with abundant polar oxygen-containing functional groups can chemically immobilize the polysulfides, and suppress the formation of the dendrites by controlling the surface morphology of the SEI on lithium metal in LSB. The isopropanol content in a suspension can fine-tune the pore structure of the membrane to achieve optimal electrochemical performance. The prepared separator displays integrated advantages of an ultrathin thickness(19 μm), lightweight(0.87 mg cm^(-2)), extremely high porosity(98.05%), and decent electrolyte affinity. As a result, the discharge capacity of the LSB with CNF separator at the first and 100 th cycle is 1.4 and 1.3 times that of PP separator, respectively. Our research provides an environmentalfriendly and facile strategy for the preparation of multifunctional separators for LSBs.

关键词： Cellulose Separator Lithium-sulfur battery Shuttle effect Growth of dendrite

Modeling high-speed cutting of SiC_(p)/Al composites using a semi-phenomenologically based damage model

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Chinese Journal of Aeronautics 2021年第8期34卷 218-229页

作者： Junfeng XIANG lijing xie Feinong GAO School of Civil Aviation Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of TechnologyBeijing 100081China

In this paper,we attempts to investigate cutting mechanisms in high-speed cutting of Al6061/Si C_(p)/15p composites using a semi-phenomenologically based damage model in the equivalent homogeneous material(EHM)*** combining macroscale EHM modeling and underlying microscale physical mechanisms,a feasible semi-phenomenological plastic model is proposed for prediction of cutting forces and chip morphology during high-speed turning Al6061/Si C_(p)/15p *** model incorporates the modified Weibull weakest-link effect to represent the strain-based damage evolution in large *** proposed semi-phenomenological constitutive model is implemented by compiling material subroutines into cutting finite element(FE)*** effects of the critical shear stresses on chip formation that depend on the toolchip frictional coefficient are accounted for in the cutting FE *** chip formation mechanism affecting material removal behaviors during high-speed turning is further *** capabilities of the proposed constitutive model are evaluated by comparing cutting forces and chip morphologies between experiments and simulations at different cutting speeds associated with strain *** EHM-based and microstructure-based models are further compared in both computational efficiency and *** simulation results show that the developed semiphenomenological constitutive formalism and cutting model are promising and efficient tools for further investigation of dynamic mechanical and cutting behaviors of particle-reinforced composites with different volume fraction and particle size.

关键词： Chip morphology Damage evolution High-speed cutting Semi-phenomenological plasticity SiC_(p)/Al composites

Effect of N-doping-derived solvent adsorption on electrochemical double layer structure and performance of porous carbon

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Journal of Energy Chemistry 2023年第5期80卷 120-127,I0004页

作者： Zhe-Fan Wang Cheng Tang Qian Sun Ya-Lu Han Zhi-Jian Wang lijing xie Shou-Chun Zhang Fang-Yuan Su Cheng-Meng Chen CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina University of Chinese Academy of Sciences Bejing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBejing 100084Chind

N-doped porous carbon has been extensively investigated for broad electrochemical *** performance is significantly impacted by the electrochemical double layer(EDL),which is material dependent and hard to *** understanding of doping-derived EDL structure hinders insight into the structure-performance relations and the rational design of high-performance ***,we analyzed the mass and chemical composition variation of EDL within electrochemical operation by electrochemical quartz crystal microbalance,in-situ X-ray photoelectron spectroscopy,and time-offlight secondary ion mass *** found that N-doping triggers specifically adsorbed propylene carbonate solvent in the inner Helmholtz plane(IHP),which prevents ion rearrangement and enhances the migration of ***,this specific adsorption accelerated solvent decomposition,rendering rapid performance degradation in practical *** work reveals that the surface chemistry of electrodes can cause specific adsorption of solvents and change the EDL structure,which complements the classical EDL theory and provide guidance for practical applications.

关键词： Carbon materials Electrochemical double layer Electrochemical quartz crystal microbalance In-situ X-ray photoelectron spectroscopy N-doping

Design of core-shell nickel oxide/silicon carbide whiskers towards excellent microwave absorption property

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Chinese Journal of Chemical Engineering 2021年第9期34卷 208-216页

作者： Jingpeng Chen Ge Song Zhuo Liu lijing xie Shoushun Zhang Chengmeng Chen CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China University of Chinese Academy of Sciences Beijing 100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Toward the increasingly serious problem of electromagnetic wave pollution,the development of absorbing material with the properties of the light,thin,wide,strong,and multiple applications scenarios is still a huge ***,the core-shell nickel oxide/silicon carbide whiskers(NiO/SiCw)with variational NiO morphologies(tulle-,flower,and rod-like)were designed and fabricated via a facile prehydrothermal method and post-annealing *** the NiO shell morphology,it can effectively be controlled by the proportion of Ni(NO_(3))_(2)·6H_(2)O,NH_(4)Cl,and CO(NH_(2))_(2).The structure of NiO/SiCw samples was investigated by XRD,SEM,XPS,TEM,and N2 *** to other morphologies of NiO,the flower-like NiO/SiCw possess a porous structure and large surface area that can benefit from the multiple reflections and attenuation of the *** an absorber,the composite with the flower-like NiO/SiCw filler loading of 50%manifests a superior microwave attenuation capability due to its special porous structure,good impedance matching,and large dielectric loss induced from heterojunction interfacial *** minimum reflection loss of flower-like NiO/SiCw is up to-56.8 dB with a thickness of 1.9 mm,and the maximum effective absorption bandwidth(EAB)reaches 5.17 *** as-prepared flower-like NiO/SiCw with strong absorption,thin thickness,and width EAB can meet the potential requirements for microwave absorption materials under oxidation environments.

关键词： Flower-like NiO/SiCw Dielectric loss Interfacial polarization Microwave absorption

Porous NiCo_2O_4 nanowires supported on carbon cloth for flexible asymmetric supercapacitor with high energy density

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Journal of Energy Chemistry 2018年第1期27卷 195-202页

作者： Huifang Zhang Dengji Xiao Qian Li Yuanyuan Ma Shuxia Yuan lijing xie Chengmeng Chen Chunxiang Lu CAS Key Laboratory of Carbon Materials Institute of Cool ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina University of Chinese Academy of Sdences Beijing 100049China National Engineering Laboratory for Carbon Fiber Technology Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina

Recently, binary metal oxides have been considerably researched for energy storage since it can provide higher electrical conductivity and electrochemical activity than single components. Besides, rational arrays structure design can effectively enhance the utilization of active material. In this article, we synthesis a porous NiCo_2O_4 nanowires arrays, which were intimate contact with flexible carbon cloth（CC）by a facile hydrothermal reaction and calcination treatment. The rational array structures of NiCo_2O_4 facilitate the diffusion of electrolyte and effectively increase the utilization of active material. The asobtained NiCo_2O_4@CC electrode exhibits a high capacitance of 1183 mF cm^（-2） and an outstanding capacitance retention of 90.4% after 3000 cycles. Furthermore, a flexible asymmetric supercapacitor（ASC）using NiCo_2O_4@CC as positive electrode and activated carbon cloth（ACC） as negative electrode was fabricated, which delivers a large capacitance of 750 mF cm^（-2）（12.5 F cm^（-3））, a high energy density of 0.24 mWh cm^（-2）（3.91 mWh cm^（-3））, as well as excellent cycle stability under different bending *** remarkable results suggest that as-assembled NiCo_2O_4@CC//ACC ASC is a promising candidate in flexible energy storage applications.

关键词： All solid-stateNiCo2O4 nanowires Carbon cloth Activated carbon cloth Asymmetric supercapacitor

Structural evolution of carbon aerogel microspheres by thermal treatment for high–power supercapacitors

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Journal of Energy Chemistry 2018年第2期27卷 439-446页

作者： Feng Li lijing xie Guohua Sun Fangyuan Su Qingqiang Kong Yufang Cao Xiangyun Guo Chengmeng Chen CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 Shanxi China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 07000I Shanxi China

In this work, a series of carbon aerogel microspheres（CAMs） with tailored pore structures were successfully prepared via a sol-gel method and subsequent heat-treatment at various temperatures from 600 to 1600 ℃. The effects of heat-treatment temperature（HTT） on the CAM microstructure were systematically investigated by physical and chemical characterization. The electrical conductivity increased by up to 250 S/cm and mesopores with high electrolyte accessibility developed in the CAM with increasing HTT. However, the specific surface area（SSA） decreased for HTTs from 1000 to 1600 ℃. The results show that these two factors should be finely balanced for further applications in high power *** CAMs carbonized at 1000 ℃ had the highest SSA（1454 m^2/g）, large mesoporous content（20%） and favorable conductivity（71 S/cm）. They delivered a high energy density of 38.4 Wh/kg at a power density of 0.17 kW/kg. They retained an energy density of 25.5 Wh/kg even at a high power density of 10.2 kW/kg,and a good rate capability of 84% after 10,000 cycles. This performance is superior to, or at least comparable to, those of most reported carbon materials.

关键词： Carbon aerogel microspheres Heat-treatment temperature Physical/chemical changes Conductivity Supercapacitor

Structure evolution of oxygen removal from porous carbon for optimizing supercapacitor performance

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Journal of Energy Chemistry 2020年第12期29卷 396-404页

作者： Siting Yuan Xianhong Huang Hao Wang lijing xie Jiayao Cheng Qingqiang Kong Guohua Sun Cheng-Meng Chen CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

The presence of oxygen functional groups is detrimental to the capacitive performance of porous carbon electrode in organic electrolyte. In this regards, hydrogen thermal reduction has been demonstrated effective approach in removing the unstable surface oxygen while maintaining the high porosity of carbon matrix. However, the exact evolution mechanism of various oxygen species during this process, as well as the correlation with electrochemical properties, is still under development. Herein, biomass-based porous carbon is adopted as the model material to trace its structure evolution of oxygen removal under hydrogen thermal reduction process with the temperature range of 400–800 °C. The optimum microstructure with low oxygen content of 0.90% and proper pore size distribution was achieved at 700°C. XPS, TPRMS and Boehm titration results indicate that the oxygen elimination undergoes three distinctive stages(intermolecular dehydration, hydrogenation and decomposition reactions). The optimum microstructure with low oxygen content of 0.90% and proper pore size distribution was achieved at 700 °C. Benefiting from the stable electrochemical interface and the optimized porous structure, the as-obtained HAC-700 exhibit significantly suppressed self-discharge and leak current, with improved cycling stability, which is attributable to the stabilization of electrochemical interface between carbon surface and electrolyte. The result provides insights for rational design of surface chemistry for high-performance carbon electrode towards advanced energy storage.

关键词： Starch-based activated carbon Oxygen functional groups Hydrogen thermal reduction Structural evolution Organic electrolytes Electrochemistry