摘 要
Li3V2 (PO4)3 / C 是使用溶胶-凝胶法合成的一种
电极材料。对合成的最佳条件是在氩流动
650C 焙烧 4
h。XRD 表明,Li3V2(PO4)3 / C 颗粒杂质相不成功的
合成。扫描电镜和透射电镜结果表明
Li3V2(PO4)3 / C
粉粒径变小和更好的同质性可以用这种方法生产的。电
化学测试显示
Li3V2(PO4)3 / C 取得了具有良好的电
化学容量、循环能力之间的
3.0 和 4.8 V,例如泄流能力
Li3V2(PO4)3 /碳复合材料在 650 年合成为 4 h℃是
191.7 mAh / g 在第一期,and160.6mAh / g 在第
50 周期 28 马/ g 电流密度。即保留率的放电容量约为
82%。
关键词:磷酸盐 锂离子电池 正极材料 电化学性能
ABSTRACT
Monoclinic Li
3
V
2
(PO
4
)
3
/C cathode material were synthesized by a sol-gel method.
The optimum condition for the synthesis of Li
3
V
2
(PO
4
)
3
are calcinations at 650°C for 4h
under argon flow. XRD revealed that Li
3
V
2
(PO
4
)
3
/C particles without the impurity phase
were successfully synthesized . SEM and TEM results showed Li
3
V
2
(PO
4
)
3
/C powder
with smaller particle size and better homogeneity could be produced by this method.
The electrochemical tests showed that the Li
3
V
2
(PO
4
)
3
/C obtained had a good
electrochemical capacity and cycle ability between 3.0 and 4.8V, For example
the
discharge capacity of Li3V2(PO4)3 /carbon composite synthesized at 650
℃ for 4h was 191.7mAh/g
in the first cycle,
and160.6mAh/g in the 50th cycle at 28mA/g current density. Namely, the
retention rate of discharge capacity is about 82%.
Key words: vanadium-based phosphate; Lithium-iom batteries; Cathode material;
Electrochemical performance
1