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最近,包覆氧化物进行表面修饰的方法已成功应用于改善锂离子电池阴极材料的容量稳定性。本文中,我们通过V2O5溶胶结合提拉法制备了V2O5多孔薄膜,并利用原子层沉积法对其包覆Al2O3原子层。V2O5多孔薄膜的电化学性质受包覆层厚度的影响,我们研究了不同薄膜厚度下的修饰效果。结果显示,原子层沉积法包覆不同厚度Al2O3原子层对锂离子电池的循环稳定性都有所改善,经10个ALD包覆循环的样品表现出最好的修饰效果。在此基础上,我们讨论探索了包覆Al2O3对容量及稳定性增强的机理。
Recently, methods for surface modification of oxide coatings have been successfully applied to improve the capacity stability of cathode materials for lithium-ion batteries. In this paper, we prepared a V2O5 porous film by V2O5 sol-assisted Czochralski method and coated it with Al 2 O 3 by atomic layer deposition. The electrochemical properties of V2O5 porous films are affected by the thickness of the coating, and we studied the effect of modification at different film thicknesses. The results show that the atomic layer deposition of different thickness Al 2 O 3 atomic layer on the lithium-ion battery cycle stability has improved, after 10 ALD coated cycle samples showed the best modification effect. On this basis, we discussed and explored the mechanism of the enhanced capacity and stability of the coated Al2O3.