Effect of V doping on electrochemical properties of LiNi1/3Co1/3Mn1/3O2 as cathode material for lithium-ion battery
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摘要: LiNi1/3Co1/3Mn1/3O2 (LNCM)因其高比容量等优点在动力电池领域受到广泛关注。然而，较差的循环性能和严重的安全问题限制了其应用前景。离子掺杂是提高材料电化学性能的有效方法之一。采用溶胶-凝胶法，以NH4VO3为钒源，成功制备了钒掺杂LiNi1/3-xCo1/3Mn1/3VxO2正极材料。结果表明：LiNi1/3-0.02Co1/3Mn1/3V0.02O2 (LNCM-V)电极材料表现出优秀的储锂性能（0.5 C时， 80次循环后，放电比容量为169 mAh/g）。通过V5+替代LiNi1/3Co1/3Mn1/3O2正极材料中部分Ni2+离子，有效地降低了Li+/Ni2+离子混排，稳定了正极材料的晶体结构，Li+离子的扩散系数得到增加，使Li+脱嵌过程中LNCM-V材料结构变得更加稳定。
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关键词:
- 锂离子电池 /
- 正极材料 /
- LiNi1/3Co1/3Mn1/3O2 /
- 钒掺杂 /
- 电化学性能
Abstract: LiNi1/3Co1/3Mn1/3O2 (LNCM) cathode material with high specific capacity has received extensive attention in power batteries. However, the serious safety issues and poor cycle performance limit its application prospect. Doping is one of the effective methods to boost the electrochemical performance of electrode materials. Vanadium-doped LiNi1/3-xCo1/3Mn1/3VxO2 cathode material was successfully prepared by the sol-gel method using NH4VO3 as vanadium source. The research results show that by replacing some Ni2+ ions in the LiNi1/3Co1/3Mn1/3O2 cathode material by V5+, the cation mixing is effectively reduced, the crystal structure of the cathode material is stabilized, and the diffusion coefficient of Li+ in the lattice increases. And the LiNi1/3-0.02Co1/3Mn1/3V0.02O2 (LNCM-V) electrode material exhibits excellent lithium storage performance (the discharge capacity is 169 mAh/g at 0.5 C after 80 cycles).-
Key words:
- lithium ion battery /
- cathode material /
- LiNi1/3Co1/3Mn1/3O2 /
- V doping /
- electrochemical properties
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图 2 (a, b) LNCM和(c, d) LNCM-V样品的SEM形貌
Figure 2. SEM images of the (a, b) LNCM and (c, d) LNCM-V samples
图 3 (a) LNCM和LNCM-V样品的循环性能，(b) LNCM-V样品的充放电曲线，(c) LNCM和LNCM-V样品的库仑效率，(d) LNCM和LNCM-V样品的倍率性能
Figure 3. (a) Cycle performances of the LNCM and LNCM-V samples, (b) Charge/discharge profiles of the LNCM-V sample, (c) Coulombic efficiency of the LNCM and LNCM-V samples, (d) Rate performance of the LNCM and LNCM-V samples
表 1 LNCM和 LNCM-V样品的晶胞参数
Table 1. Lattice parameters of the LNCM and LNCM-V samples
a/nm c /nm R(I003/I104) LNCM 0.28561 1.4223 1.22 LNCM-V 0.28593 1.4235 1.36 
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