Novel synthesis of Mn3(PO4)2·3H2O nanoplate as a precursor to fabricate high performance LiMnPO4/C composite for lithium-ion batteries
Novel synthesis of Mn3(PO4)2·3H2O nanoplate as a precursor to fabricate high performance LiMnPO4/C composite for lithium-ion batteries
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DOI：
10.1039/c5ra19121a
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发表时间：
2015-11
期刊：
影响因子：
3.9
通讯作者：
Kaipeng Wu;Guo-rong Hu;Zhongdong Peng;Zhijian Zhang;Yanbing Cao;K. Du
中科院分区：
文献类型：
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作者：
Kaipeng Wu;Guo-rong Hu;Zhongdong Peng;Zhijian Zhang;Yanbing Cao;K. Du
以乙醇为引发剂，采用新型沉淀法合成了Mn3(PO4)2·3H2O前驱体，并通过湿球磨和热处理相结合的方法将其锂化成LiMnPO4/C复合材料。合成的前驱体呈片状，具有纳米厚度。将Mn3(PO4)2·3H2O、NH4H2PO4、Li2CO3和葡萄糖的球磨混合物进行热处理后，可得到结晶良好、纯度高的LiMnPO4，粒径约为100 nm，碳包覆层厚度为2 nm。在650°C下制备的LiMnPO4/C复合材料在0.05C时的放电容量为141.7 mA h g - 1，在1C时为119.9 mA h g - 1，在5C时为88.7 mA h g - 1。同时，在0.5℃下循环100次后仍能保持95.2%的初始容量，具有较好的循环稳定性。该方法可为先进锂离子电池正极材料LiMnPO4/C的开发提供参考。
Mn3(PO4)2·3H2O precursor was synthesized by a novel precipitation process using ethanol as initiator, and was lithiated to LiMnPO4/C composite via a combination of wet ball-milling and heat treatment. The as-synthesized precursor was plate-shaped with nanosize thickness. After heat treatment of the ball-milled mixture of Mn3(PO4)2·3H2O, NH4H2PO4, Li2CO3 and glucose, the well crystallized and highly pure LiMnPO4 with the particle size of about 100 nm and the carbon coating layer of 2 nm was obtained. The LiMnPO4/C composite fabricated at 650 °C delivers discharge capacities of 141.7 mA h g−1 at 0.05C, 119.9 mA h g−1 at 1C and 88.7 mA h g−1 at 5C. Meanwhile, it can retain 95.2% of the initial capacity after 100 cycles at 0.5C, revealing a quite good cycling stability. The method described in this work could be helpful in the development of LiMnPO4/C cathode materials for advanced lithium-ion batteries.