摘要锂离子电池是新时代的高效储能材料,广泛应用于各电子器件中。有研究表明,目前实际生产的负极电极容量不足,而新型负极电极充放电过程中的容量衰减严重。尖晶石型钛酸锂(Li4Ti5O12)用作新型的绿色电极材料近年来受到广泛的关注。Li4Ti5O12在锂离子的脱-嵌过程中晶体结构能文持稳定,锂离子嵌入前后均为尖晶石结构,晶格常数变化非常小,体积变化<1%,平衡电位高，并且其平台容量高达总容量的85%。然而常规LTO的广泛应用受到其固有的绝缘特性和低电化学动力学限制。本文以石墨烯与钛酸锂材料的复合结合导电网状结构理论为基础，研究石墨烯的掺杂量对尖晶石型石墨烯电化学性能的影响，在钛酸锂负极材料中分别掺杂体积分数为1.5%，3%，4.5%的石墨烯，组装成电池并测量样品电池的循环性能，倍率性能，阻抗，容量等电化学性能。29718
毕业论文关键词：锂离子电池；钛酸锂；掺杂石墨烯；电化学性能
Abstract
Lithium ion battery has been used as high rate energy storage material nowadays, it has widespread application in electron device. It’s reported that, currently, the electric capacity of traditional anodic electrode production is lower than we except and electric capacity of new anodic electrode production severe attenuation in discharge cycle. Spinel type lithium titanate (Li4Ti5O12) has garnered a lot of attention as a new energy storage material for it’s stable chemical properties and low lattice constant change which lower than 1% as the platform capacity higher than 85%. However, the widespread application of conventional LTO is limited by its poor power performance resulted from its inherent insulating character and the low electrochemical kinetic process.
In this work we report a research that the impact of hybridized mass fraction of graphene in Li4Ti5O12 which based on Hierarchical carbon-based conductive network theory. We use Li4Ti5O12 as the anode of lithium ion batteries which hybridized with 1.5%wt 3%wt and 4.5wt graphene. And test electrochemical performance of these battery include EIS, capacity cycle and rate performance.
Key words: electrochemical property Lithium ion battery; Spinel lithium titanate; graphene hybridized
目 录
摘 要 - 1 -
1.1. 研究背景 - 2 -
1.2. 锂离子电池简介 - 3 -
1.2.1. 电解液 - 5 -
1.2.2. 隔膜 - 5 -
1.2.3. 正极材料 - 5 -
1.2.4. 负极材料 - 6 -
1.3. 尖晶石型钛酸锂(Li4Ti5O12) - 8 -
1.4. 石墨烯简介 - 10 -
1.5. 石墨烯在电化学中的应用 - 10 -
1.6. Li4Ti5O12的石墨烯掺杂改性 - 11 -
2. 锂离子电池负极的制备与检测方案 - 12 -
2.1. 球磨制备原料超细粉 - 12 -
2.2. 激光粒度分析 - 12 -
2.3. 喷雾干燥法制备Li4Ti5O12前驱体 - 12 -
2.4. 固相合成法合成C-LTO\G - 13 -
2.5. XRD分析 - 13 -
2.6. 扫描电子显微镜 - 13 -
2.7. 容量测试 - 14 -
2.8. 阻抗测试 - 14 -
2.9. 循环测试 - 14 -
3. 实验流程 - 15 -
3.1. 试验药品 - 15 -
3.2. C-LTO的制备流程 - 15 -
3.3. 电极片的制作 - 16 -
3.4. 电池的组装 - 17 -
4. 实验结果与讨论 - 17 -
4.1. 扫描电子显微镜 - 17 -
4.2. 激光粒度测试 - 18 -
4.3. X射线衍射测试 - 18 - 石墨烯掺杂钛酸锂材料电化学性能研究:http://www.751com.cn/huaxue/lunwen_25068.html