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One Step Ball-Milling Synthesis of LiFePO_ 4 Nanoparticles as the Cathode Material of Li-Ion Batteries

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 687-690页

作者： ai xinping LI Hai LI Xiaoyan LIAO Qinli LIU Bingdong YANG Hanxi College of Chemistry and Molecular Science Wuhan University Wuhan 430072 China Fenghua Lithium Battery Co. Ltd. Zhaoqing 526040 Guangdong China

A one-step synthetic method was used to synthesize Olivline LiFePO4 powders by direct ball milling the stoichiometric mixture of Fe, Li3PO4 , and FePO4 powders. XRD and TEM measurements revealed that the as-prepared LiFePO4 powder have a homogeneous Olivine structure and a uniform size distribution of ca. 50 nm. Based on this material, a LiFePO4/C composite was prepared and used for the cathode material of Li-ion batteries. The charge-discharge experiments demonstrated that the LiFePO4/C composite material has a high capacity of 132 mAh/g at 0.1 C and a quite highrate capability of 95 mAh/g at 1 C. This new ball-milling method may provide a completely green synthetic route for preparing the materials of this type cost-effectively and in large volume.

关键词： LiFePO4 cathode material ball millings onestep synthesis green synthesis

Investigation of Ru(phen)_3^(2+)-Hydrazine-Ce(Ⅳ) Chemiluminescence System and Its Analytical Application

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 672-676页

作者： SHI Bo＇an ZENG Danyun JI Xinghu XI Juan ai xinping HE Zhike College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei China Department of Chemistry and Chemical Engineering Huhei Institute for Nationalities Enshi 445000 HubeiChina

It was observed that hydrazine could enhance the chemiluminescence （CL） intensity of tris-（1,10 phenanthroline）ruthenium（Ⅱ）（Ru（ phen）3^2＋）- Cerium（ Ⅳ ） ice（ Ⅳ ）） system, based on which, a novel CL system, Ru（phen）3^2＋ Hydrazine-Ce（Ⅳ）, was established. This CL system was investigated and employed to detect hydrazine. Under the optimum experimental conditions, the linear range and detection limit of the proposed method are 2.0× 10^-6-2.0×10^-3g·L^-1 and 1. 8×10^-6g·L^-1, respectively. For 1. 5 × 10^-5, 1.5×10^-4 and 1.2×10^-3 g·L^-1 hydrazine, the relative standard deviation （RSD） is 2.9%, 2.2% and 3. 1%, respectively （n= 11）. The proposed method has been used to detect the content of hydrazine in the synthetic samples with satisfactory results.

关键词： tris-( 1, 10-phenanthroline) ruthenium ( Ⅱ ) chemiluminescene hydrazine

Boosting rate and cycling performance of K-doped Na_(3)V_(2)(PO_(4))_(2)F_(3) cathode for high-energy-density sodium-ion batteries

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Green Energy & Environment 2022年第6期7卷 1253-1262页

作者： Jiexin Zhang YangYang Lai Peng Li Yanxia Wang Faping Zhong Xiangming Feng Weihua Chen Jianjun Liu xinping ai Hanxi Yang Yuliang Cao Engineering Research Center of Organosilicon Compounds&Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China National Engineering Research Center of Advanced Energy Storage Materials Hunan410205China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou450001China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences1295 Dingxi RoadShanghai200050China

As a promising cathode material,Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)has attracted wide attention for sodium-ion batteries(SIBs)because of its high operating voltage and high structural ***,the low intrinsic electronic conductivity and insufficient Na ion mobility of NVPF limit its ***,K-doping NVPF is prepared through a facile ball-milling combined calcination *** effects of K-doping on the crystal structure,kinetic properties and electrochemical performance are *** results demonstrate that the Na_(2.90)K_(0.10)V_(2)(PO_(4))_(3)F_(3)(K0.10-NVPF)exhibits a high capacity(120.8 mAh g^(-1) at 0.1 C),high rate capability(66 mAh g^(-1) at 30 C)and excellent cycling performance(a capacity retention of 97.5%at 1 C over 500 cycles).Also,the occupation site of K ions in the lattice,electronic band structure and Na-ion transport kinetic property in K-doped NVPF are investigated by density functional theory(DFT)calculations,which reveals that the K-doped NVPF exhibits improved electronic and ionic conductivities,and located K^(+) ions in the lattice to contribute to high reversible capacity,rate capability and cycling ***,the K-doped NVPF serves as a promising cathode material for high-energy and high-power SIBs.

关键词： Potassium doping Na_(3)V_(2)(PO_(4))_(2)F_(3) Cathode materials Sodium ion batteries Long-term stability

An advanced low-cost cathode composed of graphene-coated Na_(2.4)Fe_(1.8)(SO_(4))_(3) nanograins in a 3D graphene network for ultra-stable sodium storage

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Journal of Energy Chemistry 2021年第3期30卷 564-570页

作者： Yongjin Fang Qi Liu Xiangming Feng Weihua Chen xinping ai Liguang Wang Liang Wang Zhiyuan Ma Yang Ren Hanxi YangYuliang Cao College of Chemistry and Molecular Sciences Engineering Research Center of Organosilicon Compounds&Materials of Ministry of EducationWuhan UniversityWuhan 430072HubeiChina Department of Physics City University of Hong KongTat Chee AvenueKowloonHong KongChina College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001HenanChina X-ray Science Division Advanced Photon SourceArgonne National Laboratory9700 South Cass AvenueLemontIL 60439USA

Iron-based electrodes have attracted great attention for sodium storage because of the distinct cost ***,exploring suitable iron-based electrodes with high power density and long duration remains a big ***,a spray-drying strategy is adopted to construct graphene-coated Na_(2.4)Fe_(1.8)(SO_(4))_(3) nanograins in a 3D graphene microsphere *** unique structural and compositional advantages endow these electrodes to exhibit outstanding electrochemical properties with remarkable rate performance and long cycle *** analyses further explain the outstanding electrochemical properties from the structural aspect.

关键词： Na_(2.4)Fe_(1.8)(SO_(4))_(3) Polyanions Spray-drying Cathode Sodium-ion batteries

Boosting the sodium storage performance of Prussian blue analogues via effective etching

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Science China Chemistry 2023年第11期66卷 3154-3160页

作者： Yanan Zhao Jian Peng Kean Chen Laibing Luo Hui Chen Hang Zhang Shulei Chou Xiangmin Feng Weihua Chen Ruoyu Cao xinping ai Yongjin Fang Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusSquires WayNorth Wollongong 2522Australia Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Prussian blue analogues(PBAs)have gained significant popularity as cathode materials for sodium-ion batteries(SIBs)due to their remarkable features such as high capacity and convenient ***,PBAs usually suffer from kinetic problems during the electrochemical reactions due to sluggish Na~+diffusion in the large crystals,resulting in low-capacity utilization and inferior rate *** this study,we present a facile etching method aiming at activating the sodium storage sites and accelerating the Na~+transport of Na_2NiFe(CN)_6(denoted as NaNiHCF)by precisely controlling its morphologies.A progressive corner passivation phenomenon occurred in NaNiHCF during the etching process,which led to a substantial augmentation of the specific surface area as the morphology transitioned from a standard cube to a dice ***,by controlling the etching time,the obtained NaNiHCF-3 electrode exhibited boosted electrochemical performance with high reversible capacity of 83.5mAh g~(-1)(98.2%of its theoretical capacity),superior rate capability(71.2 mAh g~(-1)at 10 C),and stable cycling life-span at different *** experimental and computational methods reveal the remarkably reversible structural evolution process and improved Na~+diffusion *** believe that this work can serve as an indispensable reference to tailor the structure of PBAs to obtain improved electrochemical performance.

关键词： Prussian blue analogues Na_2NiFe(CN)_6 cathode materials etching sodium-ion batteries

Amorphous NaVOPO_(4)as a High-Rate and Ultrastable Cathode Material for Sodium-Ion Batteries

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CCS Chemistry 2021年第10期3卷 2428-2436页

作者： Yongjin Fang Jiexin Zhang Faping Zhong Xiangming Feng Weihua Chen xinping ai Hanxi Yang Yuliang Cao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072 2National Engineering Research Center of Advanced Energy Storage Materials Changsha 410205 3College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001

The low cost and profusion of sodium resources make sodium-ion batteries(SIBs)a potential alternative to lithium-ion batteries for grid-scale energy storage ***,the use of conventional cathode materials for Na-ion intercalation/deintercalation cannot satisfy the requirements of high-powered and long lifespan performance due to multiphase transition and lattice confinement.

关键词： amorphous NaVOPO_(4) cathod e materials polyanion single-phase-like mechanism sodium-ion batteries

Improved Initial Charging Capacity of Na-poor Na0.44MnO2 via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries

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Chemical Research in Chinese Universities 2021年第2期37卷 274-279页

作者： ZHOU Xi Lai Yangyang WU Xiangjiang CHEN Zhongxue ZHONG Faping Al xinping YANG Hanxi CAO Yuliang Engineering Research Center of Organosilicon Compounds and Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072P.R.China Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan430072P.R.China National Engineering Research Center of Advanced Energy Storage Materials Hunan410205P.R.China

Sodium-ion batteries(SIBs)are promising for grid-scale energy storage applications due to the natural abundance and low cost of *** various Na insertion cathode materials,Na0.44MnO2 has attracted the most attention because of its cost effectiveness and structural ***,the low initial charge capacity for Na-poor Na0.44MnO2 hinders its practical ***,we developed a facile chemical presodiated method using sodiated biphenly to transform Na-poor Na0.44MnO2 into Na-rich *** presodiation,the initial charge capacity of Na0.44MnO2 is greatly enhanced from 56.5 mA·h/g to 115.7 mA·h/g at 0.1 C(1 C=121 mA/g)and the excellent cycling stability(the capacity retention of 94.1%over 200 cycles at 2 C)is *** presodiation strategy would open a new avenue for promoting the practical applications of Na-poor cathode materials in sodium-ion batteries.

关键词： Sodium-ion battery Na0.44MnO2 Chemical presodiation Sodium biphenyl Initial charge capacity

Enabling an intrinsically safe and high-energy-density 4.5 V-class Li-ion battery with nonflammable electrolyte

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InfoMat 2020年第5期2卷 984-992页

作者： Ziqi Zeng Xingwei Liu Xiaoyu Jiang Zhenjie Liu Zhangquan Peng Xiangming Feng Weihua Chen Dingguo Xia xinping ai Hanxi Yang Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhanChina State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilinChina College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhouChina Key Lab of Theory and Technology for Advanced Batteries Materials College of EngineeringPeking UniversityBeijingChina

Developing nonflammable electrolyte with a wide electrochemical window has become an urgent demand for high-energy-density and high-safe lithium-ion batteries(LIBs).Herein,a fluorinated nonflammable phosphate electrolyte is developed to construct a safe 4.5 V-class LIB(Si-SiC-C/0.35Li2MnO3-0.65LiNi0.5Mn0.5O2).The proposed fluorinated phosphate electrolyte,0.8 M LiPF6/tris(2,2,2-trifluoroethyl)phosphate(TFEP)+5 vol%fluoroethylene carbonate(FEC)+5 vol%vinylene carbonate(VC),is not only completely nonflammable but also exhibits excellent oxidative/reductive stability on 0.35Li2MnO30.65LiNi0.5Mn0.5O2 cathode and Si-SiC-C *** in situ differential electrochemical mass spectrometry and X-ray photoelectron spectroscopy proved that TFEP-based electrolyte does not decompose into gases but forms a high-quality electrode-electrolyte interface on cathode surface at high working *** 4.5 V-class LIBs using 0.8 M LiPF6 TFEP-based nonflammable electrolyte shed some light on potential application for high-safe and low-cost larger-scale energy storage.

关键词： high energy density lithium-ion battery nonflammable electrolyte safety

3D Localization for Multiple AUVs in Anchor-Free Environments by Exploring the Use of Depth Information

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1051-1053页

作者： Yichen Li Wenbin Yu xinping Guan the Department of Automation Shanghai Jiao Tong UniversityShanghai 200240 the Key Laboratory of System Control and Information Processing Ministry of Education of ChinaShanghai Jiao Tong UniversityShanghai 200240China

Dear Editor,This letter investigates the cooperative localization problem for multiple autonomous underwater vehicles(AUVs)in underwater anchor-free environments,where AUV localization errors grow without bound due to the accumulated errors in inertial measurements(termed accumulated errors hereafter)and the lack of anchors(with known positions).

关键词： AUVs underwater hereafter