先进二次电池电极材料的构效关系
文献类型：研究报告
| 作者 | 闫霄 |
| 完成日期 | 2016 |
| 关键词 | 锂离子电池 钠离子电池 电极材料 微观结构 电化学 |
| 学科主题 | 能源化学 |
| 文献子类 | 专题报告 |
| 英文摘要 | 电极材料是锂（钠）离子先进二次电池的“心脏”，其电化学性能直接决定电池的性能。本报告旨在通过对电极材料的合理设计来提高材料的电化学性能，建立材料的微观结构与电化学性能的构效关系。 本文的主要结论是： 1. 以蔗糖和聚偏氟乙烯为碳源和氟源，通过简单的方法制备了氟掺杂碳包覆的磷酸锰铁锂（LiMn0.75Fe0.25PO4/C-F）纳米板正极材料。设计的材料具有快速的锂离子和电子传导路径，表现出优异的脱嵌锂性能。在高倍率20 C下，可逆比容量达到130.3 mA h g-1。 2. 通过搅拌水热的方法合成了拉长的弯曲的青铜矿二氧化钛/锐钛矿二氧化钛（TiO2-B/Anatase）纳米线复合材料。在设计的材料结构中：主相TiO2-B沿利于锂离子传输的<110>晶面进行生长；TiO2-B与Anatase能在界面处形成利于电子传输的异质结构。通过调控TiO2-B与Anatase的比例制备了具有优异脱嵌锂性能的复合材料，高倍率30 C下，材料的可逆比容量高达145.7 mA h g-1。 3. 作为搅拌水热方法的扩展，我们又采用了相同的方法合成了由纳米管自组装而成的麻绳状NaHTi2O4(OH)2纳米材料。在材料的结构中含有：拉长的一维纳米管；超薄的管壁；大量的-OH基团；大的比表面积；麻绳状的结构。这些结构特征利于钠离子和电子的传输。作为钠离子电池负极材料，材料表现出优异的倍率性能，50 C倍率下可逆比容量达到80 mAh g-1。; Electrode materials are the “critical factor” for lithium (sodium) ion batteries, and its electrochemical performance directly determines the performance of batteries. The aim of this report is to improve the electrochemical performance of the materials by the reasonable design of the electrode materials, and to establish the relationship between the microstructure and the electrochemical properties of the materials. Solutions presented in this article can be summarized as follows: 1. A novel composite of LiMn0.75Fe0.25PO4 (LMFP) nanoplates with fluorine-doped carbon layer which is synthesized via a facile method using hybrid sucrose and polyvinylidene fluoride as carbon and fluorine sources. The designed structure provide ideal pathways for rapid electron and lithium ion transport. As cathode for lithium ion battery, material exhibits excellent performance (130.3 mA h g-1 at an ultrahigh rate current density of 20 C).2. TiO2-bronze/anatase TiO2 hybrid nanowires are successfully prepared through a facile stirring hydrothermal method, which have elongated bending wire morphology and a heterojunction structure with TiO2-bronze and anatase TiO2 nanocrystal. As anode for lithium ion battery, materials exhibit excellent performance (145.7 mA h g-1 at a higher rate of 30 C).3. As an extension of stirring hydrothermal method, in this section were synthesize a novel compound of twine-like NaHTi2O4(OH)2 nanotubes. The material have unique structures containing that elongated one-dimensional nanotubes, ultrathin tubes wall, large surface area, large number of –OH group as well as twine-like winding body, which are beneficial to ion transfer and electron transport during electrochemical energy storage process. As anode for sodium ion battery, NaHTi2O4(OH)2 demonstrates excellent electrochemical capability (80 mAh g-1 at high current rate of 50 C). |
| 源URL | [http://ir.qibebt.ac.cn/handle/337004/9806]  |
| 专题 | 青岛生物能源与过程研究所_先进界面技术团队 |
| 推荐引用方式 GB/T 7714 | 闫霄. 先进二次电池电极材料的构效关系. 2016. |
入库方式： OAI收割
来源：青岛生物能源与过程研究所
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