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Solid state synthesis and characterization of iron(Ⅱ) pyrophosphate Fe_2P_2O_7

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Chinese Chemical Letters 2007年第12期18卷 1525-1527页

作者： Zheng Wei Xiao Guo Rong Hu zhong dong peng Ke Du Xu Guang Gao School of Metallurgical Science and Engineering Central South University Changsha 410083 China

Offwhite pure Fe2P207 was synthesized through solid phase reaction using Fe203 and NH4H2PO4 in argon atmosphere. The reaction products of Fe203 and NHaH2PO4 at a series of temperatures from 400 to 900 ℃ were characterized by XRD. Comparison and analysis of XRD patterns of resultant products indicated well-crystallized Fe2P207 could be obtained over 630 ℃ and Fe2P207 prepared at 700 ℃ was triclinic in cell type. Comparison of the cell parameters proved that the as-prepared Fe2P207 belonged to β- Fe2P207 in crystal phase and SEM showed its size distribution was 0.5-2 μm.

关键词： Preparation Solid phase reaction Characterization

Pure LiFePO4 with high energy density prepared by water quenching treatment

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Chinese Chemical Letters 2007年第10期18卷 1256-1260页

作者： Xu Guang Gao Guo Rong Hu zhong dong peng Ke Du Xin Rong Deng School of Metallurgical Science and Engineering Central South University Changsha 410083 China

A compound ＂vacuum firing and water quenching＂ technique was presented in the synthesis of LiFeP04 cathode powder. The sample was prepared by heating the we-decomposed precursor mixtures sealed in vacuum quartz-tube, followed by water quenching at the sintering temperature. The results indicate that using the ＂fast quenching＂ treatment can succeed in controlling overgrowth of the grain size of final product and improving its utilization ratio of active material. The sample synthesized by this technique has the high reversible discharge specific capacity and good cyclic electrochemical performance.

关键词： Li-ion battery Cathode material LiFePO4 Water quenching

Synthetic LiFePO4/C without using inert gas

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Chinese Chemical Letters 2007年第3期18卷 337-340页

作者： Guo Rong Hu Xu Guang Gao zhong dong peng Ke Du Yan Jun Liu School of MetaUurgical Science and Engineering Central South University Changsha 410083 China

LiFePO4/C was synthesized by high temperature solid-state method with cheap Fe2O3, LiH2PO4 and glucose as raw materials in absence of inert gas. The sample had ordered olivine-type structure other impurities characterized by the test of X-ray diffraction （XRD）. The charge-discharge test showed the sample could demonstrate 120.5 mAh/g at 0.2C rate with good cyclic capability. The powder microeleetrode cyclic voltammetry test indicated that the redox process of the sample had good reversibility.

关键词： Li-ion batty Cathode material LiFePO4/C Inert gas

Synthesis and electrochemical performance of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2 as a concentration-gradient cathode material for lithium batteries

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Chinese Chemical Letters 2014年第6期25卷 883-886页

作者： Long-Wei Liang Ke Du zhong-dong peng Yan-Bing Cao Guo-Rong Hu School of Metallurgy and Environment Central South University

A well-ordered and spherical LiNi0.6Co0.2Mn0.2O2 cathode material was successfully synthesized from Ni and Mn concentration-gradient precursors via co-precipitation. The crystal structure, morphology and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and charge-discharge tests. The material delivered an initial discharge capacity of 174.3 mAh/g at 180 mA/g （1 C rate） between 2.8 and 4.3 V and more than 93.1% of that was retained after 100 cycles. In addition, it also exhibited excellent rate capability, high cut-off voltage and temperature performance.

关键词： Lithium secondary batterie sLiNi0.6Co0.2Mn0.2O2 Concentration-gradient Electrochemical performance

Synthesis of spherical LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 cathode materials for lithium-ion batteries by a co-oxidation-controlled crystallization method

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Chinese Chemical Letters 2011年第9期22卷 1099-1102页

作者： Wan Min Liu Guo Rong Hu zhong dong peng Ke Du Yan Bing Cao Qiang Liu School of Metallurgical Science and Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Hunan Institute of Engineering Xiangtan 411104 China

Spherical LiNi0.8Co0.15Al0.05O2 OOH precursor prepared by a co-oxidation-controlled crystallization method, was used to synthesize LiNi0.5Co0.15Al0.05O2. The obtained LiNi0.8Co0.15Al0.05O2 materials showed excellent electrochemical performance, with an initial discharge capacity of 193.5 mAh/g and capacity retention of 95.1% after 50 cycles when cycled at 0.2 C rate between 2.8 and 4.3 V.

关键词： Li-ion battery Cathode material LiNi0.8Co0.15Al0.05O2 Co-oxidation-controlled crystallization

Microwave synthesis of Li_2FeSiO_4 cathode materials for lithium-ion batteries

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Chinese Chemical Letters 2009年第8期20卷 1000-1004页

作者： zhong dong peng Yan Bing Cao Guo Rong Hu Ke Du Xu Guang Gao Zheng Wei Xiao School of Metallurgical Science and Engineering Central South University Changsha 410083 China

A novel synthetic method of microwave processing to prepare Li2FeSiO4 cathode materials is adopted. The Li2FeSiO4 cathode material is prepared by mechanical ball-milling and subsequent microwave processing. Olivin-type Li2FeSiO4 sample with uniform and fine particle sizes is successfully and fast synthesized by microwave heating at 700 ℃ in 12 rain. And the obtained Li2FeSiO4 materials show better electrochemical performance and microstructure than those of Li2FeSiO4 sample by the conventional solidstate reaction. ？2009 Yan Bing Cao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Li-ion battery Cathode material Microwave synthesis Li2FeSiO4

Synthesis and characterization of phosphate-modified LiMn_2O_4 cathode materials for Li-ion battery

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Chinese Chemical Letters 2010年第11期21卷 1382-1386页

作者： Qing Lai Jiang Ke Du Yan Bing Cao zhong dong peng Guo Rong Hu Ye Xiang Liu School of Metallurgical Science and Engineering Central South University Changsha 410083 China

LiMn2O4 spinel cathode materials were modified with 2 wt.%Li-M-PO4（M=Co,Ni,Mn） by polyol synthesis *** phosphate surface-modified LiMn2O4 cathode materials were physically characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and energy dispersive X-ray spectroscopy（EDS）.The charge-discharge test showed that the cycling and rate capacities of LiMn2O4 cathode materials were significantly enhanced by stabilizing the electrode surface with phosphate.

关键词： Li-ion battery Cathode materials Spinel LiMn2O4 Phosphate Polyol synthesis method

Some Rotundities of Orlicz–Lorentz Spaces

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1893-1919页

作者： Wan zhong GONG peng WANG Department of Mathematics Anhui Normal UniversityWuhu 241000P.R.China

K-UR,K-LUR and K-R are the generalizations of UR,LUR and R respectively,which are of great significance in Banach space *** in Orlicz–Lorentz function spaceΛ_(ϕ,ω)^(◦)[0,γ)equipped with the Orlicz norm,the research methods of K-UR,K-LUR and K-R are much more complicated than those of UR,LUR and *** this paper we obtain some criteria of K-UR,K-LUR and K-R ofΛ_(ϕ,ω)^(◦)[0,γ)by means of the norm of dual space and H_(μ)property ofΛ_(ϕ,ω)^(◦)[0,γ).

关键词： Orlicz-Lorentz space Orlicz norm k-uniform rotundity locally k-uniform rotundity krotundity

New Results in Cooperative Adaptive Optimal Output Regulation

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Journal of Systems Science & Complexity 2024年第1期37卷 253-272页

作者： dong Yuchen GAO Weinan JIANG zhong-Ping State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819China Department of Electrical and Computer Engineering Tandon School of EngineeringNew York UniversityBrooklynNY 11201USA

This paper investigates the cooperative adaptive optimal output regulation problem of continuous-time linear multi-agent *** the multi-agent system dynamics are uncertain,solving regulator equations and the corresponding algebraic Riccati equations is challenging,especially for high-order *** this paper,a novel method is proposed to approximate the solution of regulator equations,i.e.,gradient descent *** is worth noting that this method obtains gradients through online data rather than model information.A data-driven distributed adaptive suboptimal controller is developed by adaptive dynamic programming,so that each follower can achieve asymptotic tracking and disturbance ***,the effectiveness of the proposed control method is validated by simulations.

关键词： Adaptive dynamic programming cooperative output regulation gradient descent method multi-agent systems.