类球形快离子导体Li_(0.1)Ce_xCa_(0.9-x)TiO_3的制备及其在固态电解质中的应用
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- 英文论文题名：Preparation Of Sphere-like Fast Ion Conductor Li_(0.1)Ce_xCa_(0.9-x)TiO_3 And Its Application In Solid Polymer Electrolyte
- 论文作者：肖围 ; 缪畅 ; 王脂胭
- 英文论文作者：Wei Xiao ; Chang Miao ; Zhiyan Wang ; College of Chemistry and Environmental Engineering ; Yangtze University
- 年：2016
- 作者机构：长江大学化学与环境工程学院;
- 论文关键词：快离子导体 ; 固态电解质 ; 喷雾干燥 ; 锂离子电池
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：TM912;O631
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：190k
- 原文格式：D
- 会议级别：全国
摘要
本文首先通过喷雾干燥成功制备了Li_(0.1)Ce_xCa_(0.9-x)TiO_3前躯体粉末,将其置于空气气氛下700°C恒温6h,即可得到类球形快离子导体Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3颗粒材料,后通过固相法合成PVDF-HFP基全固态聚合物电解质(SPE)。理化性能测试结果表明:当加入的Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3与基体PVDF-HFP质量比为1:1时,所制备的SPEs具有均一的表面形貌和良好的热稳定性;此时对应的室温离子电导率高达0.2037 mS cm-1,且电导率与温度的倒数符合Arrhenius关系式;所组装的Li/SPE/Li模拟电池在5天内,其界面阻抗值能快速从650Ωcm~(-1)稳定在1050Ωcm~(-1),电化学稳定窗口高达5.5 V,对应的的锂离子迁移数为0.363。将所制备的SPEs组装成Li/SPE/LiCoO_2扣式电池进行电池性能测试,其也表现出优异的循环和倍率性能,1.0 C下循环100次,其放电比容量为104.8 mA h g~(-1),2.0 C循环200次,其放电比容量保持率仍然高达88.35%。
Li_(0.1)Ce_xCa_(0.9-x)TiO_3 was prepared by spray-drying combining with sintering processes, and the sphere-like fast ion conductor Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3 was obtained after being calcined 6 h at 700 °C in air atmosphere. Then the sample was employed to fabricate PVDF-HFP-based solid polymer electrolytes(SPEs). Performance results show that the SPE has uniform surface and excellent thermal stability when the weight ratio of Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3 to PVDF-HFP is up to 1:1, the ionic conductivity can be up to 0.2037 mS cm~(-1) and the reciprocal temperature vs. ionic conductivity follows Arrhenius relationship. The interfacial resistance of the Li/SPE/Li cell can rapidly increase to a steady value, and the SPE can be stable at 5.5 V. When the SPE is used as an electrolyte material for lithium ion battery, the cell presents excellent rate and cyclic performance, which can be attributed to the improved ionic conductivity at room temperature and lithium ion transference number.
Li_(0.1)Ce_xCa_(0.9-x)TiO_3 was prepared by spray-drying combining with sintering processes, and the sphere-like fast ion conductor Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3 was obtained after being calcined 6 h at 700 °C in air atmosphere. Then the sample was employed to fabricate PVDF-HFP-based solid polymer electrolytes(SPEs). Performance results show that the SPE has uniform surface and excellent thermal stability when the weight ratio of Li_(0.1)Ce_(0.1)Ca_(0.5)TiO_3 to PVDF-HFP is up to 1:1, the ionic conductivity can be up to 0.2037 mS cm~(-1) and the reciprocal temperature vs. ionic conductivity follows Arrhenius relationship. The interfacial resistance of the Li/SPE/Li cell can rapidly increase to a steady value, and the SPE can be stable at 5.5 V. When the SPE is used as an electrolyte material for lithium ion battery, the cell presents excellent rate and cyclic performance, which can be attributed to the improved ionic conductivity at room temperature and lithium ion transference number.
引文
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[3]An,Q.;Rider,A.N.;Thostenson,E.T.Carbon.2012,50:4132.