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国家自然科学基金(50371007)

作品数:7 被引量:100H指数:4
相关作者:仇卫华赵海雷高玲李玥林久更多>>
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7 条 记 录,以下是 1-10
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Li_4Ti_5O_(12)作为锂离子电池负极材料电化学性能被引量:45
2005年
采用固相法合成了锂钛复合氧化物Li4Ti5O12研究了保温时间对其结构及电化学性 能的影响.结果表明,保温时间为2,4h时样品的循环性能比较好,在80mA/g充放电下,30次 循环后的比容量可高达159mAh/g.
高玲仇卫华赵海雷
关键词:锂离子电池负极材料复合氧化物
锂离子电池用硅薄膜负极材料的研究
<正>近几年来,研究最广泛的锂离子电池负极材科是石墨以及各种碳材料,但研究表明,传统的碳材料存在比容量低、安全性差和高倍率充放电不理想等缺点。因此寻找高比容量、高安全性和优良循环性能的锂离子电池负极材料成为人们的研究方向...
郭洪赵海雷尹朝丽仇卫华李福燊
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Heat treatment effect on electrochemical properties of spinel Li_4Ti_5O_(12)被引量:11
2008年
Anode material Li4Ti5O12 was prepared at 800℃ by a solid-state reaction, followed by heat-treatment at 600℃ for different times (0, 2, 8, and 12 h). The effects of heat-treatment time on the particle morphology, rate-capability, and electrode kinetic process of the Li4Ti5O12 electrode, and on the lithium ion diffusion coefficient inside the Li4Ti5O12 electrode were investigated. Proper heat treatment could smoothen the particle surface of Li4Ti5O12 particles and increase the rate-capability of the electrode. Overlong heat treatment might cause particle aggregation and hence result in a poor electrode kinetic process. A sample with 8 h of heat treatment showed the best rate-capability and the lowest electrode reaction resistance. Heat treatment for 2-8 h does not significantly change the lithium ion diffusion coefficient inside the Li4Ti5O12 electrode, whereas, 12-h treatment results in a lower lithium ion diffusion coefficient.
LI Yue ZHAO Hailei TIAN Zhihong QIU Weihua LI Xue
Electrochemical characteristics of CoSn_x alloy composite anode for lithium-ion rechargeable batteries被引量:2
2006年
Nano/micro-scaled CoSnx alloy powders synthesized via carbothermal reduction at 800 ℃ with different compositions were characterized for anode materials in Li-ion battery. The synthesized spherical CoSnx particles show a loose nano/micro sized particle structural characteristic, which is apparently favorable for the improvement of cycling stability. The prepared CoSn3 alloy composite electrode exhibits a low initial irreversible capacity of ca.130 mAh·g-1 and a high specific capacity of ca.440 mAh·g-1 at constant current density of 100 mA·g-1. The relatively large particle size is considered to be the main reason for the lower irreversible capacity of CoSn3 electrode.
GUO Hong ZHAO Hailei JIA Xidi QIU Weihua
Effect of the synthesis method of SnSb anode materials on their electrochemical properties被引量:1
2007年
SnSb alloy powders for the anode of Li-ion batteries were synthesized by two kinds of reduction precipitation methods: solution titration and rapid mixing. Two kinds of SnSb alloy powders showed different phase compositions and particle morphologies although the same starting materials were used. The SnSb alloy electrode synthesized by titration exhibits high reversible specific capacity and good cycling stability, whereas the rapid-mixing sample shows high irreversible capacity and fast capacity fade. The broad particle size distribution of SnSb powders synthesized by titration is considered to be responsible for the improvement of cycling stability. The initial charge-discharge efficiency exceeding 80% has been obtained for the titration sample. The electrochemical reaction process of two kinds of synthesized SnSb composite electrodes was characterized by cyclic voltammetry and AC impedance techniques.
Chaoli Yin Hailei Zhao Hong Guo Xianliang Huang Weihua Qiu
关键词:ANODE
钒掺杂对Li_4Ti_5O_(12)性能的影响被引量:16
2006年
采用固相反应法合成了锂离子电池负极材料Li4-xVxTi5O12(x=0,0.1,0.2),研究了钒掺杂对其晶格结构、相组成和颗粒形貌以及电化学性能的影响。结果表明:钒的掺杂增大了Li4-xVxTi5O12的晶胞参数,降低了晶格的规整度,增大了合成Li4-xVxTi5O12的颗粒度;同时随着钒掺杂量的增加,Li4-xVxTi5O12在高倍率下的循环稳定性增加,电极极化程度变小。Li4Ti5O12在3.0C下的比容量衰减迅速,但Li4-xVxTi5O12(x=0.1,0.2)在3.0C下仍保持很好的循环稳定性。钒的掺杂降低了Li4Ti5O12的比容量,这与钒在晶格中的存在形式以及掺杂试样较大的颗粒度有直接关系。
赵海雷林久仇卫华李玥
关键词:锂离子电池负极材料LI4TI5O12掺杂
锂离子电池锡铜合金负极材料的制备及性能的研究
合金负极商业化应用的一个最大障碍是它在充放电过程中会引起较大的体积变化,这将导致材料的粉化进而引起容量的迅速衰减.一种有效的解决途径是形成金属间化合物M′M,其中M为活性相,能够与金属锂发生反应:M′为非活性相,不与锂反...
贾喜娣赵海雷何见超陈敬波仇卫华
关键词:锂离子电池负极
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Effect of Y-doping on the electrical conductivity of SrTiO3 anode material for solid oxide fuel cells
<正>Solid oxide fuel cell (SOFC) as an all-ceramic power generation system has attracted more attention due to ...
Li Xue
关键词:ANODE
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合成温度对Li_4Ti_5O_(12)电化学性能的影响被引量:41
2004年
采用固相法合成了锂钛复合氧化物Li4Ti5O12,研究了煅烧温度对其结构及电化学性能的影响。结果表明:煅烧温度为700℃和800℃时,样品的循环性能比较好,在85mA/g的电流密度下,30次循环后的比容量可达155mAh/g。
高玲仇卫华赵海雷
关键词:比容量电流密度合成温度煅烧温度固相法复合氧化物
SnSb复合负极材料的合成和电化学性能被引量:4
2006年
采用液相化学还原法,制备了锂离子电池用SnSb复合负极材料。通过SEM、XRD和恒流充放电实验,研究了反应溶液浓度对SnSb合金相组成、颗粒形貌和电化学性能的影响;研究了粘结剂PVDF含量对电极循环稳定性的影响。在氯化物和还原剂NaBH4浓度分别为0.04 mol/L和0.10 mol/L时,得到的产物中金属间化合物(SnSb相)的含量最高,制备的电极循环性能也相对较好;当PVDF的含量为10%(质量比)时,制备的电极在200 mA/g的电流下循环稳定性较好。
尹朝丽赵海雷郭洪仇卫华
关键词:锂离子电池负极电化学性能
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