| 锂离子电池正极材料Na3V2(PO4)2F3的原位XRD及固体核磁共振研究; In situ XRD and solid state NMR characterization of Na3V2(PO4)2F3 as cathode material for lithium-ion batteries | |
| 郝小罡 ; 刘子庚 ; 龚正良 ; 文闻(中国科学院上海应用物理研究所) ; 谈时 ; 杨勇 | |
| 2012-01 | |
| 关键词 | MAS SS-NMR 同步辐射原位XRD Na3V2(PO4)2F3 离子交换 锂离子电池 synchrotron in situ XRD Na3V2(PO4)2F3 ion-exchange lithim-ion batteries |
| 英文摘要 | 通讯作者, E-mail: yyang@xmu.edu.cn; [中文文摘]采用溶胶凝胶法制备Na3V2(PO4)2F3/C 复合材料, 该材料具有优异的电化学循 环性能和倍率性能. 利用电化学原位同步辐射X 射线衍射(XRD)及魔角旋转固体核磁共 振(MAS SS-NMR)技术研究了Na3V2(PO4)2F3 材料充放电过程中结构变化过程及Li/Na 嵌 入-脱出反应. 研究结果表明, Na3V2(PO4)2F3的电极反应按嵌入-脱出反应机理进行, 充放 电过程中材料具有优异的结构稳定性. 我们还发现Na3V2(PO4)2F3 与电解液接触后与电 解液中的Li+发生部分交换反应形成LixNa3-xV2(PO4)2F3. 在首次充电时, Li+和结构中Na1 位置的Na+共同从晶格中脱出; 而首次放电过程中, Na+和Li+共同嵌入到晶格中; 充放电 过程中发生的是Li+和Na+的共嵌入-脱出反应.[英文文摘]In this work, Na3V2(PO4)2F3/C composite fluorophosphate cathode material is synthesized by a sol-gel process. The as prepared material shows excellent electrochemical performance. A capacity of 125 mAh/g of the material is obtained at the current density of 150 mA/g. When cycling at the current density of 3000 mA/g, it still delivers a capacity of 110 mAh/g (88% of the initial capacity at 150 mA/g). The charging and discharging mechanism of this material is investigated by synchrotron-based in situ XRD and ex situ MAS SS-NMR. In situ XRD results indicate a single phase electrochemical delithiation/lithiation process and the material shows excellent structure stability during charge/discharge process. The exsitu MAS SS-NMR results show that Li-Na exchange happens when Na3V2(PO4)2F3 contacts with electrolyte, and the charge/discharge mechanism is: Li+ and Na+ in the Na1 site are deintercalated from the structure in the first charge process; Li+ and Na+ are co-intercalated in the structure in the following discharge process. |
| 语种 | 中文 |
| 出版者 | 《中国科学：化学》编辑部 |
| 内容类型 | 期刊论文 |
| 源URL | [http://dspace.xmu.edu.cn/handle/2288/14770]  |
| 专题 | 化学化工－已发表论文 |
| 推荐引用方式 GB/T 7714 | 郝小罡,刘子庚,龚正良,等. 锂离子电池正极材料Na3V2(PO4)2F3的原位XRD及固体核磁共振研究, In situ XRD and solid state NMR characterization of Na3V2(PO4)2F3 as cathode material for lithium-ion batteries[J],2012. |
| APA | 郝小罡,刘子庚,龚正良,文闻,谈时,&杨勇.(2012).锂离子电池正极材料Na3V2(PO4)2F3的原位XRD及固体核磁共振研究.. |
| MLA | 郝小罡,et al."锂离子电池正极材料Na3V2(PO4)2F3的原位XRD及固体核磁共振研究".(2012). |
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