检索结果-南通市图书馆

基于li10GeP12S2全固态电池关键材料的热稳定性研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

储能科学与技术 2025年

作者：张文杰任东生吴宇芮新宇刘翔冯旭宁卢兰光北京理工大学材料学院清华大学车辆与运载学院北京航空航天大学材料科学与工程学院

全固态锂电池具有宽工作温域、高能量密度和高功率密度等优势，是最具有潜力的下一代储能候选电池之一。硫化物电解质li10GeP12S2（LGPS）凭借其超高的锂离子电导率 (1×10-3S cm-1)吸引了研究者的广泛关注。不幸的是，高能量密度体系下... 详细信息

全固态锂电池具有宽工作温域、高能量密度和高功率密度等优势，是最具有潜力的下一代储能候选电池之一。硫化物电解质li10GeP12S2（LGPS）凭借其超高的锂离子电导率 (1×10-3S cm-1)吸引了研究者的广泛关注。不幸的是，高能量密度体系下的LGPS全固态电池关键材料的热稳定性并没有被报道。本文研究了硫化物固态电解质LGPS分别与正极 (liNi0.92Co0.04Mn0.04O2，NCM92)、负极（SiC）的热稳定性。通过差示扫描量热法（DSC）和同步热分析-质谱联用技术（STA-MS），分析了硫化物固态电解质、正极、负极以及其混合物的产热产气特性。在产热产气分析的基础上，利用扫描电子显微镜（SEM）结合能谱分析（EDS）技术、X射线衍射（XRD）和X射线光电子能谱（XPS）对不同温度下的产物成分进行了深入分析。当温度升高至200oC时，NCM92正极发生相变，释放大量氧气，与硫化物电解质发生轻微反应，生成P2Sx和微量SO2。当温度升高至310oC时，LGPS和正极混合样品发生剧烈放热反应，生成金属氧化物、金属硫化物和磷酸盐等。本研究揭示了NCM92|LGPS|SiC全固态电池关键材料的热稳定性，为全固态锂电池的材料选择和安全优化设计提供理论支持。

关键词：全固态锂电池 li GeP S 高能量密度热稳定性

Ce掺杂对liCoO2电子结构及li+迁移影响的第一性原理研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

功能材料 2025年

作者：张旭昀于馥瑶王勇谭秀娟东北石油大学机械科学与工程学院

liCoO2作为锂离子电池正极材料具有优异的体积能量密度。但其在高电压条件下的结构稳定性差,这会导致liCoO2的性能下降。稀土元素掺杂是改良liCoO2性能的有效手段,但掺杂改性机理目前在原子与电子尺度层面尚需进一步明确。本文采用第一... 详细信息

liCoO2作为锂离子电池正极材料具有优异的体积能量密度。但其在高电压条件下的结构稳定性差,这会导致liCoO2的性能下降。稀土元素掺杂是改良liCoO2性能的有效手段,但掺杂改性机理目前在原子与电子尺度层面尚需进一步明确。本文采用第一性原理计算方法,研究了Ce掺杂对liCoO2电子结构及li+迁移性质的影响机理。结果表明,Ce掺杂显著扩大了晶胞体积,降低了晶胞内的电荷密度,减少相互作用的强度,使晶胞更加稳定。liCoO2在Ce掺杂后由半导体特性转变为金属性,增加了载流子密度,提高了材料的导电性能。经过Ce掺杂后,li+的迁移势垒相比未掺杂时降低了93.12%。这主要是因为Ce掺杂导致li层厚度增加,使得锂离子更容易发生迁移,从而提升电池的功率密度和循环寿命。

关键词：稀土掺杂锂离子电池电子结构 li 迁移第一性原理

Effect of Crystallinity on Electrochemical Insertion/Extraction of li in Transition Metal Oxides Part Ⅱ: TiO_2, V_2O_5 and MoO_3

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第1期16卷 5-14页

作者： Tomoki TSUMURA and Michio INAGAKI (Graduate School of Engineering, Hokkaido University Kita-ku, Sapporo, 060-8628, Japan) Graduate School of Engineering Hokkaido University Kita-ku Sapporo 060-8628 Japan NARD Institute Ltd. Amagasaki 660-0805 2 Nishinagasu Japan Aichi Institute of Technology Yakusa Toyota 470-0392 Japan

Electrochemical insertion/extraction of li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and showed a wide range of crystallinity. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materials on electrochemical li insertion/extraction pedermance was discussed. These three transition metal oxides were classified as one group on the basis of whether the crystallinity of these oxides affects to the performance or not; liMn_2O_4 and liCo_(0.5)O_2 belongs to the former group and TiO_2, V_2O_5 and MoO_3 to the latter.

关键词： li Effect of Crystallinity on Electrochemical Insertion/Extraction of li in Transition Metal Oxides Part V2O5 and MoO3

EFFECTS OF SMALL ADDITIONS OF Mg AND Ag ON PRECIPITATION PROCESS OF Al-Cu-li-(Mg)-(Ag)-Zr ALLOYS

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1998年第3期8卷 2-7页

作者： Ziqiao, Zheng Biping, Huang Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｅｒｎａｒｙＡｌＣｕＭｇａｌｏｙｓｗｉｔｈｈｉｇｈＣｕ∶Ｍｇｍａｓｓｒａｔｉｏｓ，ｓｍａｌａｄｄｉｔｉｏｎｓｏｆＭｇｐｒｏｍｏｔｅｔｈｅｐｒｅｃｉｐｉｔａｔｉｏｎｏｆｓｔｒｅｎｇｔ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｅｒｎａｒｙＡｌＣｕＭｇａｌｏｙｓｗｉｔｈｈｉｇｈＣｕ∶Ｍｇｍａｓｓｒａｔｉｏｓ，ｓｍａｌａｄｄｉｔｉｏｎｓｏｆＭｇｐｒｏｍｏｔｅｔｈｅｐｒｅｃｉｐｉｔａｔｉｏｎｏｆｓｔｒｅｎｇｔｈｅｎｉｎｇｐｈａｓｅｓｗｈｉｃｈ...

关键词： Al li alloys microstructure precipitation silver magnesium

A dendrite-free li plating host towards high utilization of li metal anode in li–O_2 battery

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第7期64卷 478-484页

作者： Chao li Jishi Wei Panlong li Wenfei Tang Wuliang Feng Jingyuan liu Yonggang Wang Yongyao Xia Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Fudan University

The intense interest of li–O_2 battery stems from its ultrahigh theoretical energy density, but its application is still hindered by the issues of li anode. Herein, RuO_2-CNTs composite, a conventional O_2 cathode catalyst in li–O_2 battery, is first utilized as an anode host for dendrite-free li plating/stripping with high Coulombic efficiency. It is demonstrated that such excellent plating/stripping performance arises from the lithiophilicity characteristic of Ru nanoparticles(that is derived from the in-situ electrochemical conversion from RuO_2 to Ru/li_2O) and buffer space provided by CNTs. Furthermore, the RuO_2-CNTs electrode pre-deposited with limited li(RuO_2-CNTs@li anode) is coupled with a RuO_2-CNTs catalytic cathode to form a li–O_2 full cell, which displays an extended cycle life with dramatically improved energy *** achieved cell shows a high stability of 200 cycles with RuO_2-CNTs@li anode(1 mg li) that sheds light on the efficient utilization of li anode in li–O_2 batteries.

关键词： li metal anode li utilization li-O2 battery Dendrite-free High energy density

Quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor(li_(0.84)Fe_(0.16))OHFeSe

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第5期36卷 90-97页

作者： C.Chen Q.liu T.Z.Zhang D.li P.P.Shen X.L.Dong Z.-X.Zhao T.Zhang D.L.Feng State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908 National Laboratory of Superconductivity Institute of PhysicsChinese Academy of SciencesBeijing 100190 Hefei National Laboratory for Physical Science at Microscale CAS Center for Excellence in Quantum Information and Quantum Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026

The Major ana zero mode(MZM), which manifests as an exotic neutral excitation in superconductors, is the building block of topological quantum computing. It has recently been found in the vortices of several iron-based superconductors as a zero-bias conductance peak in tunneling spectroscopy. In particular, a clean and robust MZM has been observed in the cores of free vortices in(li_(0.84)Fe_(0.16))OHFeSe. Here using scanning tunneling spectroscopy, we demonstrate that Major ana-induced resonant Andreev reflection occurs between the STM tip and this zero-bias bound state,and consequently, the conductance at zero bias is quantized as 2e^2/h. Our results present a hallmark signature of the MZM in the vortex of an intrinsic topological superconductor, together with its intriguing behavior.

关键词： OHFeSe Quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor MZM li STM Fe

Effect of Sintering Temperature and Zinc Content on Some Properties of li-Zn Ferrites

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第5期12卷 329-334页

作者： A.M.El-Saird (Inorganic Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)S.B.Hanna(Refractories and Building Materials Dept., National Research Centre, Dokki, Cairo, Egypt) Inorganic Chemistry Dept. National Research Centre Dokki Cairo Egypt Refractories and Building Materials Dept. National Research Centre Dokki Cairo Egypt

li-Zn mixed ferrites with composition formula Znxli0.5-x/2Fe2.5-x/2O4 (0.2≤x≤0.8) were prepared by the usual ceramic method in 1000~1150℃. The effects of Zn substitution and sintering temperature on the formation, densification, microstructure and a.c. electrical conductivity have been studied. Under the effect of changing the firing temperature and Zn content, high sintered li-Zn ferrite bodies are achieved. More fine structure bodies having high electrical resistance are obtained at high Zn content

关键词： li BDH Effect of Sintering Temperature and Zinc Content on Some Properties of li-Zn Ferrites Zn

Preparation of li-B Alloy and Study of Its Microstructure and Discharge Characteristics

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第6期16卷 581-584页

作者： Zhijian liU, Zhiyou li, Wei DUAN, Xuanhui QU, Baiyun HUANG and Siqi ZHANG (State Key Laboratory for Powder Metallurgy , Central-South University of Technology, Changsha 410083, China) [Manuscript received November 2, 1999] State Key Lab. for Powder Metall. Central South Univ. of Technol. Changsha 410083 China

A li-B alloy has been prepared using a pretreated amorphous B powder and pure li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated- Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the li7B6 would be more finely distributed in the metal li by means of intensified stirring. The discharge characteristic of the li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.

关键词： li Preparation of li-B Alloy and Study of Its Microstructure and Discharge Characteristics

Electronic Structures and Adsorption of li-Doped Graphenes for CO

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2015年第3期32卷 101-104页

作者：刘晓娟曹文强黄子瀚袁杰房晓勇曹茂盛 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 School of life and Environmental Sciences Minzu University of China Beijing 100081 Department of Physics School of Sciences Minzu University of China Beijing 100081

We research the adsorption geometries graphene （li-GR） before and after CO and electronic structures of pristine graphene （p-GR） and li-doped adsorption by first-principles. The adsorption energies Ead of CO on p-GR and li-GR are calculated. The results demonstrate that Ead of CO on li-GR is from -3.3 eV to -3.5 eV, meanwhile Q is up to 0.13e, which indicate that strong electrostatic attractions occur between CO and li-GR, while CO is physically adsorbed on p-GR. The obvious accumulated charge in electron density difference and increasing carrier density suggest that the conductivity of li-GR is improved considerably after CO adsorp- tion. An adsorption mechanism is also proposed. Our results provide a path to achieving CO sensors with high performance.

关键词： li Electronic Structures and Adsorption of li-Doped Graphenes for CO GR