Li3V2(PO4)3/C microspheres with high tap density and high performance synthesized by a two-step ball milling combined with the spray drying method
Li3V2(PO4)3/C microspheres with high tap density and high performance synthesized by a two-step ball milling combined with the spray drying method
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DOI：
10.1016/j.matlet.2013.10.040
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发表时间：
2014-01
影响因子：
3
通讯作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Fan Lv;Jie-qun Liu
中科院分区：
文献类型：
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作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Fan Lv;Jie-qun Liu
采用两步球磨结合喷雾干燥法合成了Li3V2(PO4)3/C微球。 XRD结果表明，样品呈单斜Li3V2(PO4)3相，未检测到杂质相。 SEM 和 TEM 结果表明，Li3V2(PO4)3/C 微球（直径 1–3 µm）由均匀分布的纳米颗粒（直径 50–200 nm）组成，纳米颗粒被纳米碳层（1–2 nm 厚）涂覆和互连。样品的振实密度高达1.49 g cm−3。在3.0-4.3 V电位范围内，样品在1C、10C和20C倍率下的放电比容量分别为124.4、108.6和89.5 mAh g−1，并表现出优异的循环性能。
Li3V2(PO4)3/C microspheres are synthesized by a two-step ball milling combined with spray drying method. XRD results reveal that the sample exhibits a single monoclinic Li3V2(PO4)3phase, and no impurity phases are detected. SEM and TEM results indicate that the Li3V2(PO4)3/C microspheres (diameter 1–3 μm) are composed of uniformly distributed nanoparticles (diameter 50–200 nm), and the nanoparticles are coated and inter-connected by nano carbon layers (1–2 nm thick). The tap density of the sample is as high as 1.49 g cm−3. In the potential range of 3.0–4.3 V, the sample exhibits specific discharge capacities of 124.4, 108.6 and 89.5 mAh g−1at 1C, 10C and 20C rates, respectively, and shows excellent cycling performance.