A simple, cheap soft synthesis routine for LiFeP04 using iron(III) raw material
A simple, cheap soft synthesis routine for LiFeP04 using iron(III) raw material
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DOI：
10.1016/j.jpowsour.2007.02.002
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发表时间：
2007-05-01
影响因子：
9.2
通讯作者：
Zhang, K. L.
中科院分区：
文献类型：
--
作者：
Wang, L. N.;Zhang, Z. G.;Zhang, K. L.
以聚乙二醇（PEG）为还原剂和碳源，通过LiOH中心点H2O和FePO 4中心点4 H（2）O的简单流变相反应（RPR）合成了有序橄榄石结构的LiFePO 4。将所需量的水加入到起始材料中以形成流变学前体，并在700 ℃下分解以直接形成结晶相LiFePO 4，而无需球磨、制备中间体、预烧结和后沉积处理。通过扫描电子显微镜（SEM）和光学粒度分析仪对平均粒径约为216 nm的细颗粒进行了检测。在0.1C（17 mA g（-1））倍率下，首次放电容量达到157 mAh g（-1），并且在室温下以1、2和3C倍率循环40次后，该材料表现出优异的比容量、充放电效率和循环效率。简单、廉价的工艺以及优异的高速率性能使得这种RPR方法在商业上可行。(c)2007 Elsevier B. V.保留所有权利。
An order olivine structure LiFePO4 was synthesized with a simple theological phase reaction (RPR) of LiOH center dot H2O and FePO4 center dot 4H(2)O in the presence of PEG as a reductive agent and carbon source. A required amount of water was added to the starting materials to form the theological precursor and decomposed at 700 degrees C to form the crystalline phase LiFePO4 directly, without ball-milling, preparation of intermediates, pre-sintering and post-deposition treatment. Fine particles with an average particle size about 216 nm are examined by scanning electron microscopy (SEM) and optical particle size analyzer. An initial discharge capacity of 157 mAh g(-1) was achieved for the as-prepared LiFePO4 material with a rate of 0.1C (17 mA g(-1)), what's more, this material shows excellent specific capacity, charge-discharge efficiency and cycle efficiency at high current rates, almost no capacity loss can be observed up to 40 cycles with the rate of 1, 2 and 3C at room temperature. The simple, cheap process as well as the excellent high-rate performance makes this RPR method feasible commercially. (c) 2007 Elsevier B.V. All rights reserved.