采用微乳液法合成了 Fe0.94 Mn0.06 PO4@MCNT 钠离子电池正极材料。采用 XRD 和 SEM/EDS对材料的结构、表面形貌及成分进行了分析。采用电化学测量方法对组装的钠离子电池进行恒流充放电和电化学阻抗谱的测试。结果表明,Fe0.94 Mn0.06 PO4@MCNT复合材料以0.1,0.2,0.5和1.0 C 倍率在电化学窗口1.5~4.2 V 充放电,放电比容量分别达160.6,147.9,137.5和106.8 mAh/g。Fe0.94 Mn0.06 PO4@MCNT 电化学性能比 FePO4@MCNT 和纯的 Fe-PO4有明显提高。
Fe0.94 Mn0.06 PO4@MCNT was prepared by micro-emulsion technique.The structure of sample was ana-lyzed by XRD.The analysis of morphology and composition were carried by SEM/EDS,the electrochemical per-formance of assembled sodium ion battery was tested by galvanostatic discharge/charge tests and electrochemi-cal impedance spectra (EIS).The result show that the discharge specific capacity of this cathode material was up to 160.6,147.9,137.5,106.8 mAh/g at 0.1,0.2,0.5,1 C in electrochemical window of 1.5-4.2 V.Compared with FePO4@MCNT and FePO4 ,there was obvious improvement in electrochemical performance.
参考文献
[1] | Takahashi M;Ohtsuka H;Akuto K;Sakurai Y .Confirmation of long-term cyclability and high thermal stability of LiFePO4 in prismatic lithium-ion cells[J].Journal of the Electrochemical Society,2005(5):A899-A904. |
[2] | Feng Z;Wang F .Rearch status of LiFePO4 cathode mate-ial for lithium-ion battery[J].Journal of Functional Mate-rials,2011,42(4):581-584. |
[3] | Yu K H;Yang X;Cheng Y Z .Thermal analysis and two-directional air flow thermal management for lithium-ion battery pack[J].Journal of Power Sources,2014,70(2):193-200. |
[4] | Tarascon, J.-M. .Key challenges in future Li-battery research[J].Philosophical transactions of the Royal Society. Mathematical, physical, and engineering sciences,2010(1923):3227-3241. |
[5] | Doubaji S;Valvo M;Saadoune I et al.Synthesis and characterization of a new layered cathode material for sodi-um ion batteries[J].Journal of Power Sources,2014,26(61):275-281. |
[6] | Liu X Z;Wang X .High stable post-spinel NaMn2 O4 cath-ode of sodium ion battery[J].J Mater Chem A,2014,36(2):14822-14828. |
[7] | Xu S J;Zhang J X;Liu Y .A maize-like FePO4@MCNT nanowire composite for sodium-ion batteries via a microe-mulsion technique[J].J Mater Chem A,2014,20(2):7221-7226. |
[8] | Miller;Clayton T .The US geological survey mineral re-sources[R].USA:USGS,2010. |
[9] | Padhi AK.;Masquelier C.;Okada S.;Goodenough JB.;Nanjundaswamy KS. .EFFECT OF STRUCTURE ON THE FE3+/FE2+ REDOX COUPLE IN IRON PHOSPHATES[J].Journal of the Electrochemical Society,1997(5):1609-1613. |
[10] | Allen, JL;Jow, TR;Wolfenstine, J .Analysis of the FePO4 to LiFePO4 phase transition[J].Journal of solid state electrochemistry,2008(7/8):1031-1033. |
[11] | Reale P.;Scrosati B.;Delacourt C.;Wurm C.;Morcrette M.;Masquelier C. .Synthesis and thermal behavior of crystalline hydrated iron(III) phosphates of interest as positive electrodes in Li batteries[J].Chemistry of Materials,2003(26):5051-5058. |
[12] | S. M. Zhang;J. X. Zhang;S. J. Xu;X. J. Yuan;B. C. He.Li ion diffusivity and electrochemical properties of FePO_4 nanoparticles acted directly as cathode materials in lithium ion rechargeable batteries[J].Electrochimica Acta,2013:287-293. |
[13] | Yang X;Zhang S M;Zhang J X .The study on synthesis and modification for iron phosphate[J].Functional Ma-terials Letters,2011,42(3):323-328. |
[14] | Chung S Y;Bloking J T;Chiang Y M .Electro-nically conductive phospho-olivines as lithium storage el-ectro-des[J].NATURE MATERIALS,2002,23(1):123-128. |
[15] | 刘爱芳,刘亚菲,胡中华,高歌,雷磊.金属离子掺杂LiMnPO4的电化学性能研究[J].功能材料,2010(07):1144-1146,1149. |
[16] | Zhang S M;Zhang J X .Synthesis and electrochemical performances of nano-particle FePO4 and Ce-doped Fe-PO4 cathode materials for lithium ion batteries by micro-emulsion method[J].Materials Science Forum,2013,35(3):743-744. |
[17] | Goodenough J B.Cathode materials for secondary lithium batteries[A].Honolulu:The American Electrochemical Socie-ty,1999:456-461. |
[18] | Tsang S;Chen Y;Harris P et al.A simple chemical method of opening and filling carbon nanotubes[J].Sci-ence,1994,23(3):1899-1993. |
[19] | Thostenson E T;Li C Y;Chou T W et al.Nanocom-posites in context compos[J].Sci Technol,2005,65(34):491-516. |
[20] | Tan L Y;Tang Q L .Mesoporous LiFePO4 microspheres embedded homogeneously with 3D CNT conductive net-works for enhanced electrochemical performance[J].Electrochimica Acta,2014,137(1):344-351. |
[21] | Bae J H .Evaluation of cleanness and physical properties of W/O microemulsion[J].Korean Chemical Engineer-ing Research,2002,40(6):769-777. |
[22] | Lago R;Tsang S;Lu K Y .Filling carbon nanotubes with small palladium metal crystallites:the effect of sur-face acid groups[J].Journal of the Chemical Society,1995,25(3):1355-1356. |
[23] | Yongjin Fang;Lifen Xiao;Jiangfeng Qian;Xinping Ai;Hanxi Yang;Yuliang Cao .Mesoporous Amorphous FePO4 Nanospheres as High-Performance Cathode Material for Sodium-Ion Batteries[J].Nano letters,2014(6):3539-3543. |
[24] | Shannon B Y;Baur N H .Revised effective ionic radii and systematic studies of interatomie distances in halides and chaleogenides central research and development department,experimental station,the effective ionic radii of shannon &prewitt[J].Acta Cryst,1976,23(35):751-767. |
[25] | Qi Fan;Lixu Lei;Gui Yin;Yanfeng Chen;Yueming Sun.Direct growth of FePO_4/graphene hybrids for Li-ion and Na-ion storage[J].Electrochemistry communications,2014:120-123. |
[26] | Shi Ming Zhang;Jun Xi Zhang;Suo Jiong Xu;Xu Jie Yuan;Tian Tan .Synthesis, morphological analysis and electrochemical performance of iron hydroxyl phosphate as a cathode material for lithium ion batteries[J].Journal of Power Sources,2013(Dec.1):274-279. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%