A fast synthesis of Li3V2(PO4)3 crystals via glass-ceramic processing and their battery performance
A fast synthesis of Li3V2(PO4)3 crystals via glass-ceramic processing and their battery performance
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DOI：
10.1016/j.jpowsour.2011.06.094
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发表时间：
2011-11
影响因子：
9.2
通讯作者：
K. Nagamine;T. Honma;T. Komatsu
中科院分区：
文献类型：
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作者：
K. Nagamine;T. Honma;T. Komatsu
采用微晶玻璃法合成了锂离子电池正极材料Li_3V_2（PO_4）_3。采用熔融淬冷法制备了组成为37.5Li2O-25 V2 O 5 -37.5P2O5（mol%）的玻璃，并在N2或7%H2/Ar气氛中，分别加入10wt%葡萄糖和不加葡萄糖对前驱体玻璃进行晶化。结果表明，在700°C，7%H2/Ar气氛中，用葡萄糖热处理30 min即可得到结晶良好的Li 3V 2（PO 4）3。电池性能测试表明，前驱体玻璃在1μAcm− 2倍率下的放电容量为14 mAhg − 1，含Li 3V 2（PO 4）3的微晶玻璃在700°C、7%H2/Ar中用葡萄糖制备的容量为117- 126 mAhg −1（理论容量的约96%），与热处理时间无关。本研究提出微晶玻璃工艺是一种快速合成Li 3V 2（PO 4）3晶体的方法。
A synthesis of Li3V2(PO4)3being a potential cathode material for lithium ion batteries was attempted via a glass-ceramic processing. A glass with the composition of 37.5Li2O–25V2O5–37.5P2O5(mol%) was prepared by a melt-quenching method and precursor glass powders were crystallized with/without 10wt% glucose in N2or 7%H2/Ar atmosphere. It was found that heat treatments with glucose at 700°C in 7%H2/Ar can produce well-crystallized Li3V2(PO4)3in the short time of 30min. The battery performance measurements revealed that the precursor glass shows the discharge capacity of 14mAhg−1at the rate of 1μAcm−2and the glass-ceramics with Li3V2(PO4)3prepared with glucose at 700°C in 7%H2/Ar show the capacities of 117–126mAhg−1(∼96% of the theoretical capacity) which are independent of heat treatment time. The present study proposes that the glass-ceramic processing is a fast synthesizing route for Li3V2(PO4)3crystals.