检索结果-南通市图书馆

Effect of electrolysis voltage on electrochemical reduction of titanium oxide to titanium in molten calcium chloride

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2007年第6期26卷 547-551页

作者： LIU Meifeng lu shigang KAN Surong LI Guoxun General Research Institute for Non-ferrous Metals Beijing 100088 China

The electrochemical reduction of solid TiO2 directly to solid metal is a promising alternative to the current Kroll process. The present work is aimed at studying the effect of electrolysis voltage on the rate of electrochemical reduction. The products of electrochemical reduction of TiO2 and Ti2O were examined using the scanning electron microscopy （SEM） and X-ray diffraction （XRD） techniques. The results show that Ti2O was reduced to low valent titanium oxide at 1.5 -1.7 V, which was the result of ionization of oxygen. TiO2 and Ti20 were reduced to titanium metal at 2.1-3.1 V, which was the co-action of ionization of oxygen and calciothermic reduction. The oxygen content decreased rapidly with voltage increasing from 2.1 to 2.6 V, while it changed little from 2.6 to 3.1 V. The optimized cell voltage was 2.6-3.1 V.

关键词： electrochemical reduction electrolysis voltage molten salt titanium TiO2

磷酸铁锂锂离子电池低温不可逆析锂及其对电池性能衰减的影响

在线全文

学校读者我要写书评

暂无评论

储能科学与技术 2024年第10期13卷 3656-3665页

作者：李义函卢世刚王晶查汪珺戴正航郭奕彤杨泽茜上海大学

锂离子电池低温充放电过程中发生锂的析出-溶解反应，由于不可逆析锂导致生成“死锂”，对电池性能造成影响。本文研究了磷酸铁锂锂离子电池在5 ℃～-12 ℃范围内0.1C充放电过程中锂的析锂-溶解行为，建立了总析锂量和可逆析锂量、不可... 详细信息

锂离子电池低温充放电过程中发生锂的析出-溶解反应，由于不可逆析锂导致生成“死锂”，对电池性能造成影响。本文研究了磷酸铁锂锂离子电池在5 ℃～-12 ℃范围内0.1C充放电过程中锂的析锂-溶解行为，建立了总析锂量和可逆析锂量、不可逆析锂量与充放电温度之间的关联关系；拆解低温充放电后电池，采用SEM、EDX和XPS分析了负极的形貌、元素分布和表面组成，明确了“死锂”在负极表面/内部的分布特征；研究了低温充放电后电池的充放电性能和循环性能，发现低温充放电后电池容量降低，5 ℃充放电后电池较原始样品0.5C循环容量衰减更快，而更低温度充放电后电池循环性能变好。研究得出，电池充放电温度越低，总析锂容量越高且不可逆析锂容量占比越大，而低温充放电后电池容量降低主要归因于不可逆析锂导致的活性锂损失，更低温度下充放电后电池循环性能更好归因于活性锂损失造成负极嵌脱锂最低电位的升高，而5 ℃时循环性能变差则归因于负极元素分布、孔隙结构和表面组成的改变。

关键词：磷酸铁锂锂离子电池低温充放电不可逆析锂负极形貌与元素分布性能衰减

同方期刊数据库

Failure analysis of pouch-type Li–O2 batteries with superior energy density

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第6期29卷 74-82,I0004页

作者： Shangqian Zhao Li Zhang Gangning Zhang Haobo Sun Juanyu Yang shigang lu China Automotive Battery Research Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

Li–O2 batteries have attracted significant interest in the past decade owing to their superior high specific energy density in contrast to conventional lithium ion *** 8.7-Ah Li–O2 pouch cell with768.5 Wh kg^-1 was fabricated and characterized in this investigation and the factors that influenced the electrochemical performance of the Li–O2 pouch cell were *** contrast to coin/Swagelok-type Li–O2 cells,it was demonstrated that the high-loading air electrode,pulverization of the Li anode,and the large-scale inhomogeneity of the large pouch cell are the major reasons for the failure of Li–O2 batteries with Ah *** addition,safety tests of large Li–O2 pouch cells were conducted for the first time,including nail penetration,crushing,and thermal *** was indicated that a self-limiting mechanism is a key safety feature of these batteries,even when *** this study,Li–O2 batteries were investigated in a new size and capacity-scale,which may provide useful insight into the development of practical pouch-type Li–O2 batteries.

关键词： Li–O2 battery Pouch-type cell Energy density Failure analysis Safety tests

Preparation of modified LiMn_(2)O_(4) by solid-state reaction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 71-76页

作者： lu shigang CAI Zhenping JIN Weihua LI Mingxun HUANG Songtao Division of Mineral Resources Metallurgy&MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China

Modified lithium manganese oxides were prepared by solid-state reaction of LiMn_(2)O_(4)and LiCoO_(2)as raw materials.A study was carried out by TG-DSC,XRD,DSC and electrochemical to analyse the reaction process and structural characterization of *** results show that the LiMn_(2)O_(4)reacts chemically with LiCoO_(2)at high *** of Li and partial Co atoms can insert into the LiMn_(2)O_(4)crystal lattice and a newly formed spinel phase-modified LiMn_(2)O_(4)was *** distribution of Co content is even in modified LiMn_(2)O_(4)*** modified LiMn_(2)O_(4)compound exhibits improved cycling stability at room and elevated temperature in comparison with the pure LiMn_(2)O_(4).

关键词： lithium-ion battery spinel LiMn_(2)O_(4) modification process

Preparation of high-purity straight silicon nanowires by molten salt electrolysis

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第1期29卷 171-179,I0006页

作者： Jie Zhang Sheng Fang Xiaopeng Qi Zhanglong Yu Zhaohui Wu Juanyu Yang shigang lu General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. LtdBeijing 100088China

Silicon nanowires of high purity and regular morphology are of prime importance to ensure high specific capacities of lithium-ion batteries and reproducible electrode assembly *** nickel formate as a metal catalyst precursor,straight silicon nanowires(65–150 nm in diameter)were directly prepared by electrolysis from the Ni/SiO2 porous pellets with 0.8 wt%nickel content in molten CaCl2 at 900℃.Benefiting from their straight appearance and high purity,the silicon nanowires therefore offered an initial coulombic efficiency of 90.53% and specific capacity of 3377 m Ah/*** addition,the silicon nanowire/carbon composite exhibited excellent cycle performance,retaining 90.38%of the initial capacity after 100 *** further study on the charge storage performance is still ongoing,these preliminary results demonstrate that nickel formate is an efficient and effective metal catalyst precursor for catalytic preparation of high purity straight silicon nanowires via the molten salt electrolysis,which is suitable for large-scale production.

关键词： Silicon nanowires Electrochemical reduction Silicon dioxide Nickel formate

Review of the electrochemical performance and interfacial issues of high-nickel layered cathodes in inorganic all-solid-state batteries

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1003-1018页

作者： Jing Wang Shangqian Zhao Ling Tang Fujuan Han Yi Zhang Yimian Xia Lijun Wang shigang lu National Power Battery Innovation Center GRINM Group Corporation LimitedBeijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. Ltd.Beijing 100088China Materials Genome Institute Shanghai UniversityShanghai 200444China

All-solid-state batteries potentially exhibit high specific energy and high safety,which is one of the development directions for nextgeneration lithium-ion *** compatibility of all-solid composite electrodes with high-nickel layered cathodes and inorganic solid electrolytes is one of the important problems to be *** addition,the interface and mechanical problems of high-nickel layered cathodes and inorganic solid electrolyte composite electrodes have not been thoroughly *** this paper,the possible interface and mechanical problems in the preparation of high-nickel layered cathodes and inorganic solid electrolytes and their interface reaction during charge–discharge and cycling are *** mechanical contact problems from phenomena to internal causes are also *** contact between the high-nickel cathode and solid electrolyte in space and the ionic conductivity of the solid electrolyte are the prerequisites for the good performance of a high-nickel layered *** interface reaction and contact loss between the high-nickel layered cathode and solid electrolyte in the composite electrode directly affect the passage of ions and electrons into the active *** buffer layer constructed on the high-nickel cathode surface can prevent direct contact between the active material and electrolyte and slow down their interface *** appropriate protective layer can also slow down the interface contact loss by reducing the volume change of the high-nickel layered cathode during charge and ***,the following recommendations are put forward to realize the development vision of high-nickel layered cathodes:(1)develop electrochemical systems for high-nickel layered cathodes and inorganic solid electrolytes;(2)elucidate the basic science of interface and electrode processes between high-nickel layered cathodes and inorganic solid electrolytes,clarify the mechanisms of the interfacial chemical and electrochemical r

关键词： all-solid-state lithium-ion battery high-nickel layered cathode inorganic solid-state electrolyte cathodes and electrolyte interface

Facile construction of a water-defendable Li anode protection enables rechargeable Li-O_(2) battery operating in humid atmosphere

在线全文

学校读者我要写书评

暂无评论

中国化学快报:英文版 2023年第10期34卷 236-241页

作者： Shan Min Xiaoyu Liu Aonan Wang Fanghua Ning Yuyu Liu Jiaqian Qin Jiujun Zhang shigang lu Jin Yi Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghai 200444China Metallurgy and Materials Science Research Institute Chulalongkorn UniversityBangkok 10330Thailand

The rechargeable Li-O_(2) battery endowed with high theoretical specific energy density has sparked intense research interest as a promising energy storage system. However, the intrinsic high activity of Li anode,especially to moisture, usually leads to inferior electrochemical performance of Li-O_(2) battery in humid environments, hindering its widespread application. To settle the trouble of poor moisture tolerance, fabricating a water-proof layer on the Li-metal anode could be an effective tactic. Herein, a facile strategy for constructing an ibuprofen-based protective layer on the Li anode has been proposed to realize highly rechargeable Li-O_(2) battery in humid atmosphere. Due to the in-situ reaction between ibuprofen reagent and metallic Li, the protective layer with a thickness of ~30 μm has been uniformly deposited on the surface of Li anode. Particularly, the protective layer, consisting of a large amount of hydrophobic alkyl group and benzene ring, can significantly resist water ingress and enhance the electrochemical stability of Li anode. As a result, the Li-O_(2) battery based on the protected Li anode achieves a long cycle life of 210 h(21 cycles at 1000 m Ah/g, 200 m A/g) in highly moist atmosphere with relative humidity(RH) of68%. This convenient and efficient strategy offers novel design concept of water-resistant metal anode,and paves the way to the promising future prospect for the high-energy Li-O_(2) battery implementing in the ambient atmosphere.

关键词： Li-O_(2)battery Hydrophobic Li anode protection Humid atmosphere Cycling stability

LiFePO_4/C via fluoride doping

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第6期31卷 573-577页

作者： Gu Yuan Zhang Xiangjun lu shigang Zhao Ting Jiang Danping Yang Rong Wu Aide Gen Res Inst Nonferrous Met R&D Ctr Vehicle Battery & Energy Storage Beijing 100088 Peoples R China

Non-stoichiometric compound fluoride-doped LiFePO4/C cathode materials were synthesized via solid-state reaction using MgF2 and AlF3 as dopant. The fluoride-doped LiFePO4/C samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical testing. The results show that the materials are well crystallized and fluoride doping cannot change the space structure of LiFePO4. Slight amounts of Fe2O3 with no fluoride impurity were detected. Charge-discharge curves show that fluoride-doped samples have higher capacity at low rates compared with undoped LiFePO4/C. AlF3-doped samples have highest capacity at high discharge current. Both doped samples have larger polarization voltage than undoped samples. All samples exhibit good cycle stability.

关键词： lithium-ion batteries cathode materials LiFePO4 fluoride doping

Tin oxide-graphite composite for lithium storage material in lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2003年第3期22卷 226-229页

作者： ZHANG Xiangjun, HUANG Songtao, WU Guoliang, lu shigang, and CAI ZhenpingGeneral Research Institute for Non-ferrous Metals, Beijing 100088, China General Research Institute for Non-ferrous Metals 北京 100088

A SnO-graphite composite material, which can deliver high capacities and good cycling stability compared with unsupported SnO, was described. This material prepared via chemical co-precipitation reaction in the presence of graphite consists of high dispersion of SnO with a size of about several hundred nanometers in the graphite. The phase structure was analyzed by X-ray diffraction (XRD). The morphology and the element distribution were examined by scanning electron microscopy (SEM) equipped with energy spectrum. The results show that the SnO-graphite composites produced by slowly hydrolysis have higher rechargeable capacities than pure graphite and better cycling performance than SnO.

关键词： lithium-ion battery composite co-precipitation tin oxide storage material graphite