Synthesis of LiTi2(PO4)3-acetylene black nanocomposites for lithium ion batteries by the polyvinyl alcohol assisted sol–gel method and ball-milling
Synthesis of LiTi2(PO4)3-acetylene black nanocomposites for lithium ion batteries by the polyvinyl alcohol assisted sol–gel method and ball-milling
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DOI：
10.1016/j.jpowsour.2013.01.091
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发表时间：
2013-07
影响因子：
9.2
通讯作者：
Meng Zhou;Li Liu;Lanhua Yi;Zhenhua Yang;Shangjian Mao;Yunan Zhou;Tingting Hu;Yang Yang-Yang
中科院分区：
文献类型：
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作者：
Meng Zhou;Li Liu;Lanhua Yi;Zhenhua Yang;Shangjian Mao;Yunan Zhou;Tingting Hu;Yang Yang-Yang
采用聚乙烯醇（PVA）辅助溶胶-凝胶法成功合成了磷酸钛锂（LiTi 2（PO 4）3）。为了进一步提高其电化学性能，采用球磨法制备了LiTi_2（PO_4）_3-AB纳米复合材料（乙炔黑的质量分数为5 wt.%，10重量%，15重量%和20重量%）。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对样品进行了表征。通过充放电测试、循环伏安法（CV）、电化学阻抗谱（EIS）和恒电流间歇滴定法（GITT）对样品的电化学性能进行了表征。结果表明，球磨过程使LiTi 2（PO 4）3纳米颗粒与导电乙炔黑形成网络，具有更好的电化学性能。特别地，LiTi 2（PO 4）3-AB纳米复合材料具有15 wt.乙炔黑表现出最佳的电化学性能，其提供最高的比容量和最佳的循环性能。此外，还研究了所制备样品的热力学性质。
Lithium titanium phosphate (LiTi2(PO4)3) has been successfully synthesized by a polyvinyl alcohol (PVA) assisted sol–gel method. To further improve its electrochemical properties, a ball-milling process with various amount of acetylene black (AB) has been used to form LiTi2(PO4)3-AB nanocomposites (the weight ratio of acetylene black is 5wt.%, 10wt.%, 15wt.% and 20wt.%). The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance of the samples is characterized by the charge–discharge test, cyclic voltammetry (CV), electrochemical impedance spectroscopic studies (EIS), and galvanostatic intermittent titration technique (GITT). The results show that the ball-milling process enables LiTi2(PO4)3nanoparticles to network with conductive acetylene black, which offers better electrochemical performance. Especially, LiTi2(PO4)3-AB nanocomposite with 15wt.% acetylene black shows the best electrochemical properties, which delivers the highest specific capacity and the best cycle performance. Besides, the thermodynamics properties of as-prepared samples are also been studied.