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Journal of Rare Earths 2015年第7期33卷 783-790页

作者：赵汪蒋利军武媛方叶建华袁宝龙李志念刘晓鹏王树茂 Energy Materials and Technology Research Institute General Research Institute for Nonferrous Metals

The isothermal desorption kinetics of the 1.1MgH2-2LiNH2-0.1LiBH4 system were improved by addition of LaNi4.5Mn0.5 alloy. The hydrogen desorption peak temperature of the sample containing LaNi4.5Mn0.5 reduced by approximately 5 K and the activation energy reduced by 9%. The results of isothermal dehydrogenation kinetics analysis implied that the isothermal desorption process at initial stage was controlled by the phase boundary mechanism. Moreover, the cycle performance of the materials was extended. The growth and agglomeration of the sample particles caused the deterioration of kinetics during de-/hydrogenation cycles, and then resulted in an incomplete desorption/absorption reaction which were responsible for the capacity fading. The cracking and pulverization of LaNi4.5Mn0.5 alloy had an obvious effect on preventing the composites aggregating, and the fine alloy particles could enhance the catalytic effect of the alloy, thus effectively offsetting part of the deterioration of kinetics caused by particles growth.

关键词： hydrogen storage materials Li-Mg-B-N-H hydride LaNi4.5Mn0.5 cycle performance rare earths

Construction of Cu-Zn Co-doped layered materials for sodium-ion batteries with high cycle stability

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Chinese Chemical Letters 2024年第5期35卷 441-446页

作者： Xiping Dong Xuan Wang Zhixiu Lu Qinhao Shi Zhengyi Yang Xuan Yu Wuliang Feng Xingli Zou Yang Liu Yufeng Zhao Institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

Due to its high operational voltage and energy density,P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2) has become a leading cathode material for sodium-ion batteries(SIBs),which is an ideal option for large-scale energy ***,the practical application of P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2) is limited by the capacity constraints and unwanted phase transitions,presenting significant challenges to the widespread application of *** address these challenges and optimize the electrochemical properties of the P2 phase cathode material,this study proposes a Cu and Zn co-doped strategy to improve the electrochemical *** incorporation of Cu/Zn can stabilize the P2-phase structure against P2-O2 phase transitions,thus enhancing its electrochemical *** as-obtained P2-type Na0.67[Ni_(0.3)Mn_(0.58)Cu_(0.09)Zn_(0.03)]O_(2) cathode material shows an impressive cycling stability,maintaining 80%capacity retention after 1000 cycles at 2 *** cyclic voltammetry(CV)tests show that the Cu^(2+)/Cu^(3+)redox reaction is also involved in charge compensation during the charge/discharge process.

关键词： Sodium-ion batteries Cathode material cycle performance Cu/Zn co-doped P2-type Na_(0.67)Ni_(0.3)Mn_(0.7)O_(2)

Electrochemical and structural performances of Li[Ni_(0.133)Li_(0.2)Co_(0.133)Mn_(0.533)]O_(2)material during different cycle potential windows

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Rare Metals 2022年第8期41卷 2664-2679页

作者： Jun-Qiang Li Yun-Jie Yang Jing Pang Research and Development Center for Vehicle Battery and Energy Storage General Research Institute for Nonferrous MetalsBeijing100088China Beijing Institute of Chemical Reagents Beijing102607China

The effects of cycle potential window on electrochemical behaviors,structural characteristics,and surface changes in Li[Ni_(0.133)Li_(0.2)Co_(0.133)Mn_(0.533)]O_(2)(or 0.5 Li_(2)MnO_(3)·0.5 Li(Co_(0.333)Ni_(0.333)Mn_(0.333))O2)in lithium-ion battery were *** flat charge potential plateaus,~3.9 and~4.5 V,are observed in the initial charge curves of the *** changes in specific capacity and columbic efficiency are presented at~4.5 V during the first *** specific peaks show an obvious shift with the increase in charge cutoff *** the charge cutoff potential is above4.4 V,the cycle performance decreases with the increase in charge cutoff potentials.A film with the composition of C and O elements is observed on the cycled composite particle.

关键词： Lithium-ion battery Li-rich solid solution material Charge cutoff potential cycle potential window cycle performance

Enhancing the reversible capacity and cycle stability of lithium-ion batteries with Li-compensation material Li_(6)CoO_(4)

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Science China Materials 2022年第3期65卷 620-628页

作者： Ziyu Na Chao Lai Jiang Zhou Hongzhou Zhang Dawei Song Xixi Shi Lianqi Zhang Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Materials Jiangsu Normal UniversityXuzhou 221116China Tianjin Lishen Battery Joint-stock Co.Ltd. Huayuan Science&Technology ParkTianjin 300074China

High-capacity anode materials,such as SiO and Si/C,are considered promising candidates for high-energydensity lithium-ion ***,the low initial Coulombic efficiency of these anode materials induced by side reactions(forming Li_(2)O and lithium silicate)and the formation of solid electrolyte interface film reduces the active Liions and causes low-discharge *** a Li-compensation material in the cathode or anode is an effective strategy to overcome this *** most used Li-compensation material is the stabilized lithium metal ***,this strategy has high safety risks,high costs,and is challenging to ***,the Li-compensation material of Li_(6)CoO_(4) is synthesized and *** preparation conditions,stability in the air,delithiation mechanism,and structural transformation are analyzed and *** tests reveal that the discharge capacity and capacity retention of the full pouch cells(3-Ah)with Li_(6)CoO_(4) additive is significantly ***,the reason for such improvement is *** work provides an effective strategy of Li-compensating technology to enhance the electrochemical performance of lithium-ion batteries.

关键词： lithium-ion batteries Li-compensation Li_(6)CoO_(4) Coulombic efficiency cycle performance

Hydrogen absorption-desorption cycle decay mechanism of palladium nanoparticle decorated nitrogen doped graphene

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Progress in Natural Science:Materials International 2021年第4期31卷 514-520页

作者： Jiao Li Chaonan Jin Ruijun Qian Chaoling Wu Yao Wang Yigang Yan Yungui Chen Department of Advanced Energy Materials College of Materials Science and Engineering Sichuan University Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Institute of New Energy and Low-Carbon Technology Sichuan University

As a hydrogen storage material, palladium nanoparticle decorated nitrogen doped graphene(Pd/N-r GO) has drawn much attention owing to its high absorption capacity at moderate conditions. However, its hydrogen absorption-desorption cycle performance, which is essential for their practical application, has been rarely studied. In this paper, a simple and convenient high temperature thermal reduction method was used to synthesize nitrogen-doped graphene decorated with Pd nanoparticles(Pd/N-r GO). Taken it as a representative, the hydrogen absorption-desorption cycle performance of Pd/N-r GO was investigated. The results showed that after three cycles the hydrogen storage capacity dropped from 2.9 wt% to 0.8 wt% at 25C and 4 MPa pressure. It was found that the palladium nanoparticles shed from Pd/N-RGO sheet after cycle performance test, and then agglomerated. These phenomena will weaken the hydrogen spillover effect, leading to the decrease of hydrogen storage capacity. Meanwhile, decreased defects reduce the hydrogen absorption sites, which will thus deteriorate the hydrogen storage capacity.

关键词： cycle performance Hydrogen storage Hydrogen spillover effect Agglomeration Defects

Studies on Spinel LiMn_2O_4 Cathode Material Synthesized from Different Mn Sources

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Chinese Journal of Chemical Engineering 2004年第1期12卷 124-127页

作者：唐致远冯季军彭亚宁 School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China School of Chemistry and Chemical Engineering Jinan University Jinan 250022 China

The spinel LiMn2O4 cathode material was synthesized with the solid-state reaction method. Four manganese compounds including electrolytic manganese dioxide (EMD), MnCO3, Mn3O4 and nano-EMD were used as Mn sources while LiOH·H2O was used as the uniform Li source. The crystal structure characteristics of these samples produced were investigated by means of XRD, SEM, particle size distribution analysis and specific surface area testing. Their electrochemical properties were also studied by comparing their specific capacity, charge and discharge efficiency and cycle performance.

关键词： Mn sources structure particle size capacity cycle performance

Confining Li_(2)O_(2) in tortuous pores of mesoporous cathodes to facilitate low charge overpotentials for Li-O_(2) batteries

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Journal of Energy Chemistry 2021年第4期30卷 55-61页

作者： Yin Zhou Yong Zhao Zhenjie Liu Zhangquan Peng Li Wang Wei Chen Department of Chemistry National University of Singapore3 Science Drive 3117543Singapore Institute for Advanced Study and Department of Physics Nanchang UniversityNanchang 330031JiangxiChina National University of Singapore(Suzhou)Research Institute Suzhou 215123JiangsuChina State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina Department of Physics National University of Singapore2 Science Drive 3117542Singapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207FujianChina

Achieving low charge overpotentials represents one of the most critical challenges for pursuing highperformance lithium-oxygen(Li-O_(2))***,we propose a strategy to realize low charge overpotentials by confining the growth of lithium peroxide(Li_(2)O_(2))inside mesoporous channels of cathodes(CMK-8).The CMK-8 cathode with tortuous pore structures can extend the diffusion distance of lithium superoxide(LiO_(2))in the mesoporous channels,facilitating the further reduction of LiO_(2) to lithium peroxide(Li_(2)O_(2))inside the pores and preventing them to be diffused out of the ***,Li_(2)O_(2) is trapped in the mesoporous channels of CMK-8 cathodes,ensuring a good Li_(2)O_(2)/CMK-8 contact *** CMK-8 electrode exhibits a low charge overpotential of 0.43 V and a good cycle life for 72 cycles with a fixed capacity of 500 m Ah g^(-1) at 0.1 A g^(-1).This study proposes a strategy to achieve a low charge overpotential by confining Li_(2)O_(2) growth in the mesoporous channels of cathodes.

关键词： Lithium-oxygen CMK-8 cathode Charge overpotential Lithium superoxide cycle performance

Mechanism for capacity fading of 18650 cylindrical lithium ion batteries

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Transactions of Nonferrous Metals Society of China 2017年第7期27卷 1602-1607页

作者： Jian-liang CHENG Xin-hai LI Zhi-xing WANG Hua-jun GUO School of Metallurgy and Environment Central South University Changsha 410083 China

The mechanism for capacity fading of18650lithium ion full cells under room-temperature(RT)is *** capacity loss of18650cells is about12.91%*** cells after cycles are analyzed by XRD,SEM,EIS and *** measurement shows an overall increase in the cell resistance upon ***,it also presents anincreased charge-transfer resistance(Rct)for the cell cycled at *** test shows that the reversibility of lithium ioninsertion/extraction reaction is *** capacity fading for the cells cycled can be explained by taking into account the repeatedfilm formation over the surface of anode and the side *** products of side reactions deposited on separator are able toreduce the porosity of *** a result,the migration resistance of lithium ion between the cathode and anode would beincreased,leading the fading of capacity and potential.

关键词： 18650 lithium ion battery capacity fading cycle performance

Study on environmentally friendly refrigerant R13I1/R152a as an alternative for R134a in automotive air conditioning system

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Chinese Journal of Chemical Engineering 2022年第4期35卷 292-299页

作者： Nuochen Zhang Yuande Dai Linghao Feng Biao Li School of Mechanical and Electrical Engineering Nanchang UniversityNanchang 330031China

Aiming at solving the problem of high global warming potential of R134 a,a new mixed refrigerant R13 I1/R152 a(molar fraction ratio of 35:65)with no ozone depletion potential and low global warming potential was proposed as a substitute for R134 a in automotive air *** computational models for the thermodynamic properties of R13 I1/R152 a were established by using the PR(Peng-Robinson)equation of state combined with the vdW mixing *** on these models,the cycle performance of this working fluid was calculated,which was also compared with that of R134 a and R1234 yf under the different operating *** results show that R13 I1/R152 a is a near azeotropic refrigerant whose temperature glide is approximately 0,and the saturated vapor pressure curve of which is equivalent to that of R134 ***,compared to R134 a,R13 I1/R152 a has an average 5.7%improvement in coefficient of performance as well as similar volumetric cooling *** average coefficient of performance and volumetric cooling capacity of R13 I1/R152 a are significantly higher than those of R1234 yf by 13.8%and12.0%,***,the average discharge temperature of R13 I1/R152 a is approximately13.3 K higher than that of R134 a,but it is also within reasonable ***,the application of the proposed refrigerant R13 I1/R152 a in automotive air conditioning system is technically feasible.

关键词： Binary mixture Vapor liquid equilibria Thermodynamic properties R13I1/R152a cycle performance

Application of diatomite as an effective polysulfides adsorbent for lithium-sulfur batteries

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Journal of Energy Chemistry 2017年第6期26卷 1267-1275页

作者： Zhong Li Nan Zhang Yubao Sun Hanzhong Ke Hansong Cheng Sustainable Energy Laboratory Faculty of Material Science and ChemistryChina University of Geosciences(Wuhan)Wuhan 430074HubeiChina

The lithium–sulfur batteries show the great potential to be the most promising candidate for high energy applications. However, the shuttling of soluble polysulfides deteriorates the battery performance tremendously. To suppress the diffusion of soluble polysulfides, diatomite that has abundant natural three-dimensional ordered pores is incorporated into the cathode to trap polysulfides. The composite cathode material(S-DM-AB for short), including sulfur(S), diatomite(DM), and acetylene black(AB) is prepared by an impregnation method. For comparison, another composite cathode material(S-AB for short) including sulfur and acetylene black is also prepared by the same method. The battery with S-DMAB composite cathode material delivers a discharge capacity of 531.4 m Ah/g after 300 cycles at 2 C with a capacity retention of 51.6% at room temperature. By contrast, the battery with S-AB composite cathode material delivered a capacity of only 196.9 m Ah/g with a much lower capacity retention of 18.6% under the same condition. The addition of diatomite in the cathode is proved to be a cheap and effective way to improve the life time of the lithium sulfur batteries.

关键词： Lithium–sulfur batteries Diatomite Adsorbent cycle performance