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	锂离子电池正极材料Na_3V_2(PO_4)_2F_3的原位XRD及固体核磁共振研究; In situ XRD and solid state NMR characterization of Na_3V_2(PO_4)_2F_3 as cathode material for lithium-ion batteries
	郝小罡 ; 刘子庚 ; 龚正良 ; 文闻 ; 谈时 ; 杨勇
	2012
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 MAS SS-NMR synchrotron in situ XRD Na3V2(PO4)2F3 ion-exchange lithim-ion batteries
英文摘要	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(MASSS-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.; 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 ex situ 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.; 国家重点基础研究发展规划(973计划)(2007CB209702&2011CB935903);国家自然科学基金(20873115)的资助
语种	zh_CN
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/106681]
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Na_3V_2(PO_4)_2F_3的原位XRD及固体核磁共振研究, In situ XRD and solid state NMR characterization of Na_3V_2(PO_4)_2F_3 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Na_3V_2(PO_4)_2F_3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Na_3V_2(PO_4)_2F_3的原位XRD及固体核磁共振研究".(2012).

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