Y~(3+)掺杂Li_4Ti_5O_(12)负极材料的电荷输运特性及电化学性能研究
Transport characteristics and electrochemical properties of Y~(3+)doped Li_4Ti_5O_(12)as anode material
查看参考文献30篇
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文摘
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以Li_2CO_3与锐钛矿型TiO_2为原料,六水合硝酸钇(Y(NO_3)_3·6H_2O)为钇源,采用球磨辅助固相法合成了Li_4Ti_(5-x)Y_xO_(12)(x=0,0.05,0.10,0.15,0.20)负极材料。通过X射线衍射分析(XRD)、扫描电镜(SEM)、能谱仪(EDS)与X射线光电子能谱(XPS)分别对材料的物相与形貌进行表征分析,并利用电化学工作站对材料的电化学性能与电荷输运特性进行测试。结果表明,Y~(3+)掺杂没有影响尖晶石型Li_4Ti_5O_(12)(LTO)材料的尖晶石结构,x=0.15时,Li_4Ti_(4.85)Y_(0.15)O_(12)样品的离子与电子电导率分别为2.68×10~(-7) S·cm~(-1)和1.49×10-9 S·cm~(-1),比本征材料提升了1个数量级,表现出良好的电荷输运特性。电化学测试表明,Li_4Ti_(4.85)Y_(0.15)O_(12)样品在0.1C倍率首次放电比容量可达171mAh·g~(-1),且在10C与20C高倍率下仍然拥有102mAh·g~(-1)和79mAh·g~(-1)的较高比容量,循环200周次后容量保持率分别为92.6%和89.1%,表现出良好的倍率特性。 |
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其他语种文摘
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Li_4Ti_(5-x)Y_xO_(12)(x=0,0.05,0.10,0.15,0.20)anode materials were synthesized by ball milling assisted solid-state method used Li_2CO_3and anatase TiO_2as raw materials and yttrium nitrate (Y(NO_3)_3·6H_2O)as yttrium source.The phase and morphology of the materials were characterized by X-ray diffraction(XRD),scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS)and X-ray photoelectron spectroscopy(XPS),respectively.The electrochemical performance and transport characteristics of the materials were tested and analyzed by an electrochemical workstation.The results show that there is no effect of Y~(3+) doping on the spinel structure of LTO material.When x=0.15,the ion and electronic conductivities of the Li_4Ti_(4.85)Y_(0.15)O_(12)sample are 2.68×10~(-7) S·cm~(-1) and 1.49×10-9 S·cm~(-1),respectively,which are an order of magnitude higher than that of the intrinsic LTO,and present good transport characteristics.Electrochemical tests show that a first discharge capacity of Li_4Ti_(4.85)Y_(0.15)O_(12)sample can reach 171mAh·g~(-1) at 0.1Crate.The sample still has a higher specific capacity of 102mAh·g~(-1) and 79mAh·g~(-1) at a high rate of 10Cand 20C, respectively.After 200cycles,the capacity retention rates are 92.6%and 89.1%respectively,showing good magnification characteristics. |
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来源
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材料工程
,2022,50(10):102-110 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.000209
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关键词
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掺杂
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钛酸锂
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电导率
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稀土离子
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高倍率
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地址
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1.
河北大学电子信息工程学院, 河北省类脑神经器件与系统重点实验室, 河北, 保定, 071002
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国网河北省电力有限公司电力科学研究院, 石家庄, 050021
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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电工技术 |
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基金
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天津市重点研究开发项目
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河北省自然科学基金
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文献收藏号
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CSCD:7340278
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