共搜索到213条信息，每页显示10条信息，共22页。用时：0小时0分0秒249毫秒

• La和F复合掺杂对LiMn₂O₄高倍率性能的影响

  来源： 《功能材料2013年第19期》——王弯 王婷 朱丁 陈云贵

  La和F复合掺杂对LiMn2O4高倍率性能的影响王弯,王婷,朱丁,陈云贵四川大学材料科学与工程学院摘 要:采用分段高温氧化固相法合成了掺杂La3+,F-的锂离子电池正极材料LiLa x Mn2-x F x O4-x(x=0,0.01,0.02和0.05).结果发现,在小于等于1C时,掺杂与否对其放电容量影响不大;在210C时,掺杂可明显改善倍率性能;在15C时,掺杂量也显示出重要影响,未掺杂的LiMn2O4的高倍率放电能力仅为4%,而掺杂x=0.02的达到56%.XRD物相,CV循环伏安和EIS电化学阻抗分析支撑了倍率性能的实验结果,当不出现第二相时,随掺杂量增加,电荷转移电阻,阳极和阴极反应极化逐渐减小,反应可逆性逐渐增大,但当x=0.05出现第二相时,电荷转移电阻,阳极和阴极反应极化又开始增大......

• 碳纳米管改性锰酸锂电化学性能的研究

  来源： 《材料导报2015年第2期》——孙晓刚 岳立福 彭清林 吴小勇 庞志鹏

  碳纳米管改性锰酸锂电化学性能的研究孙晓刚,岳立福,彭清林,吴小勇,庞志鹏南昌大学机电工程学院摘 要:以多壁碳纳米管(Multi-walled carbon nanotubes,MWCNTs)为主要添加相,协同超导乙炔炭黑(SP),对锰酸锂进行电化学改性.对MWCNTs进行预处理,采用扫描电子显微镜观察MWCNTs的微观形貌.掺杂不同质量比的导电剂,制成电池并以恒流充放电方法测试其电化学性能.结果表明,碳包覆后电池的初始充放电比容量都有所下降,掺入1%(质量分数,下同)MWCNTs后的LiMn2O4的首次充放电效率为96.51%,不可逆容量最小,初始放电比容量为116.42mAh/g,经20次循环后容量保持率仍达96.2%,使用复合碳源掺杂时,当m(MWCNTs)∶m(SP)=1∶2时,首次充放电效率达......

• 基于离子交换机理的尖晶石型LiMn₂O₄脱/嵌锂模拟

  来源： 《材料导报2017年第12期》——纪志永 黄智辉 袁俊生 李非 周俊奇

  基于离子交换机理的尖晶石型LiMn2O4脱/嵌锂模拟纪志永,黄智辉,袁俊生,李非,周俊奇摘 要:基于离子交换机理,以ICSD(The Inorganic Crystal Structure Database)中LiMn2O4的结构数据为基础,利用Materials Studio软件包中Visualizer模块和CASTEP模块构建并优化了尖晶石型LiMn2O4和HMn2O4以及λ-MnO2的晶体结构,并通过对比涉及各自晶体结构的系统能值,晶胞参数,键长及键角等的变化,初步验证了离子筛提锂过程是自发吸热过程;分别通过对LiMn2O4和HMn2O4添加H和Li,模拟考察了脱锂和嵌锂(即酸洗和吸附)过程中的活性原子位及H和Li的迁移轨迹,得出8a位置Li和H的离子性较强,脱锂为H置换四面体8a位置Li,并与......

• Bi和F复合掺杂对LiMn₂O₄结构及电化学性能的影响

  来源： 《材料科学与工程学报2012年第5期》——刘金练 麦发任 吴显明 李雷勇 施雯

  Bi和F复合掺杂对LiMn2O4结构及电化学性能的影响刘金练1,麦发任1,吴显明1,2,李雷勇1,施雯11. 吉首大学化学化工学院2. 湘西自治州矿产与新材料技术创新服务中心摘 要:采用固相法合成LiMn2-xBixO4-yFy(x=0,0.03;y=0,0.05,0.1),通过X-射线衍射,扫描电子显微镜,恒电流充放电及循环伏安等技术分析检测合成材料的结构,形貌及电化学性能.结果表明:合成的LiMn2-xBixO4-yFy均为尖晶石结构,无杂相,颗粒表面光滑,大小均匀.常温下以0.2C倍率循环30次,LiMn1.97Bi0.03O3.95F0.05容量保持率为90.88%,远高于未改性LiMn2O4的86.51%,常温及55℃下以1 C倍率循环100次......

• Copolymerization-Assisted Preparation of Porous LiMn₂O₄ Hollow Microspheres as High Power Cathode of Lithium-ion Batteries

  来源： 《JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第8期》——Zhimin Zou Zhaojin Li Hui Zhang Xiaohui Wang Chunhai Jiang

  Copolymerization-Assisted Preparation of Porous LiMn2O4 Hollow Microspheres as High Power Cathode of Lithium-ion BatteriesZhimin Zou1,Zhaojin Li2,Hui Zhang2,Xiaohui Wang2,Chunhai Jiang11. Fujian... of Metal Research, Chinese Academy of Sciences摘 要:Porous LiMn2O4 hollow microspheres were facilely prepared by incorporation of Li and Mn elements into a spherical......

• Influence of Sc³⁺ on LiMn₂O₄ cathode materials at elevated temperature

  来源： 《Journal of Rare Earths2008年第5期》——刘慧勇 邓干群 郭永榔

  Influence of Sc3+ on LiMn2O4 cathode materials at elevated temperature刘慧勇,邓干群,郭永榔摘 要:Sc3+-doped lithium manganese oxides were synthesized by solid-state... discharge capacity after 50th cycle at a constant current of 50 m/g, and the reversibility of LiSc0.02Mn1.98O4 was improved in comparison with pure LiMn2O4 at 50 °C. EIS indicated that film deposition......

• Capacity fading of spinel LiMn₂O₄ during cycling at elevated temperature

  来源： 《International Journal of Minerals Metallurgy and Materials2002年第3期》——Yanbin Chen and Qingguo LiuLaboratory of Solid State Ionics, University of Science and Technology Beijing, Beijing , China (Received --)

  Capacity fading of spinel LiMn2O4 during cycling at elevated temperatureYanbin Chen and Qingguo LiuLaboratory of Solid State Ionics, University of Science and Technology Beijing, Beijing 100083, China (Received 2001-09-20)摘 要:A normal spinel LiMn2O4 as cathode material for lithium-ion cells was cycled galvanostatically (0.2C) at 55℃. To determine......

• Preparation and characterization of LiAl_xMn_2-xO₄ for a supercapacitor in aqueous electrolyte

  来源： 《International Journal of Minerals Metallurgy and Materials2009年第1期》——Yun Xue,Ye Chen,Mi-lin Zhang,and Yong-de Yan College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin ,China

  . The capacity and cycle perform-ance can be improved by doping Al. The composition of x=0.1 has the maximum special capacitance of 160 F·g-1,which is 1.37 times that of LiMn2O4 electrode. The capacitance......

• LiMn₂O₄/CNTs and LiNi_0.5Mn_1.5O₄/CNTs Nanocomposites as High-Performance Cathode Materials for Lithium-Ion Batteries

  来源： 《Acta Metallurgica Sinica2015年第1期》——杨文彪 Ha Tran Nguyen Anh Tuan Luu Man Van Tran Phung Loan My Le

  were fabricated from LiMn2O4(LMO), doped spinel LiNi0.5Mn1.5O4, and purified CNTs via solid-state reaction. The structure and morphology of the electrode were characterized using XRD, SEM, and TEM......

• Structure and electrochemical properties of LiLa_xMn_2-xO₄ cathode material by the ultrasonic-assisted sol-gel method

  来源： 《International Journal of Minerals Metallurgy and Materials2009年第1期》——Ting-feng Yi) ,Yan-rong Zhu) ,and Xin-guo Hu) ) School of Chemistry and Chemical Engineering,Anhui University of Technology,Maanshan ,China ) Department of Applied Chemistry,Harbin Institute of Technology,Harbin ,China

  + in the spinel and the doped materials with La3+ have a larger lattice constant compared with pristine LiMn2O4. FT-IR indicates that the absorption peak of Mn3+-O and Mn4+-O bonds has a red and blue......