锂离子电池(LIBS)具有容量密度高、寿命长、无记忆效应等优点,在便携式电子设备、储能 设备和动力发电等方面得到了广泛的应用,随着在P-HEVs等方面的应用深入,开发更加高效环保 的锂离子动力电池变得更加迫切[1].
锂离子电池是当今国际公认的理想化学能源,具有体积小、电容量大、电压高等优点,被广泛用于 移动电话、手提电脑等电子产品[1,2].电极材料对锂离子电池的能量密度、安全性和寿命有着重要的影响.作为聚阴离子型锂离子电池正极材料,单斜结构Li3V2(P04)3因具有结构稳定、循环性能优良及安全性能好等优点而日益为人们所关注[3].但由于存在影响其电化学性能的低电导率问题,因 此提高电导率已成为研究这种材料
层状三元氧化物复合正极材料LiNi0.5Co0.2Mn0.3O2充分综合了 LiCoO2优异的循环性能、 LiMnO2较低的原料成本以及LiNiO2突出的高比容量等优点,是目前极具发展前景的正极材料之一.然而,该材料在长周期循环及大电流密度下的容量衰减严重,极大地制约了其商业化应用[1-3].
The olivine-type LiFeP04 is one of the most promising cathode materials for lithium-ion battery owing to its high operating voltage(～3.4V vs Li/Li+),large theoretical capacity(-170 mA h g-1) and envir
Lithium-ion batteries(LIBs) have attracted increased attention for energy storage development due to the immense demand from portable electronics,(hybrid) electric vehicles and stationary electrical e
LiMnP04(LMP),possessing a moderate working voltage compatible to the present electrolyte systems,can provide a higher energy density than LiFePO4 on account of its higher redox potential of Mn3+/Mn2+(
锂离子电池已经广泛应用在手机,笔记本电脑等移动电子设备.同时锂离子电池具有在电动汽 车和大规模储能装置的应用前景.但是传统锂离子电池正极材料无法满足人们对高比容量,高倍率 性能的电池的需求.因而,钒基氧化物作为高比容量的锂离子电池正极材料成为了研究热点.同时 钒基氧化物展现出其应用于下一代钠离子电池电池的潜力.
With an escalating energy crisis and greenhouse gas emission issue, green energy sources and electric vehicles have received a large amount of attention. High energy and high power rechargeable lithiu
过渡金属氧化物材料在二次电池的电极材料中应用广泛,如正极材料LiMO2,NaMO2,(M=Ni,Co,Mn,Fe,V等),负极材料MOx(M=Ni,Co,Fe).因为梯度材料可集合单个材料的优点,取得优异的综合性能,最近得到研究者的广泛关注[1].在镍钴锰三元材料中,内核高镍,表面高锰或者高铝的材料可以同时取得优异的比容量和循环稳定性.在本文中,离子置换方法被用来构建具有Ni,Mn,以及Al浓度梯
The development of environment-friendly and high energy density cathode materials is highly desired for the clean and sustainable Li-ion batteries(LIBs) system. To take advantage the effect of oxygen-