| LiNi0.6Co0.2Mn0.2O2单晶的简易制备及其电化学性能 | |
| Single-Crystal LiNi0.6Co0.2Mn0.2O2: Facile Preparation and Electrochemical Performance | |
| 摘要: 以Ni0.6Co0.2Mn0.2(OH)2和LiOH·H2O为前驱体，在LiOH·H2O不过量的条件下，采用简单的固相焙烧法，在910℃下制备出单晶LiNi0.6Co0.2Mn0.2O2(NCM622)。所得材料无需水洗、烘干、退火等处理，可直接用于电极浆料的制备。电化学测试表明，所得NCM622单晶具有较高的比容量和优异的循环稳定性。在0.1C电流下的首次放电比容量达到181.2mAh·g-1，0.3C下的首次放电比容量为174.4 mAh·g-1。在0.3C的电流密度下，经过300次循环，放电比容量为150.7mAh·g-1，容量保持率为86.4%，经500次循环后，放电比容量仍有141.2 mAh·g-1，容量保持率为81.0%。该电化学性能优于850℃下焙烧的多晶NCM622和940、960℃下焙烧的较大尺寸的单晶NCM622，表明910℃是制备单晶NCM622的合理温度。研究表明，单晶NCM622在循环过程中可保持结构稳定性。 | |
| 关键词: 高镍材料 单晶 正极 固相焙烧 锂离子电池 电化学 | |
| 基金项目: 华友新能源科技(衢州)有限公司与浙江大学联合项目资助。 | |
| Abstract: Single-crystal LiNi0.6Co0.2Mn0.2O2 (NCM622) was prepared by a facile solid-state calcination method at 910 ℃ using Ni0.6Co0.2Mn0.2(OH)2 and LiOH·H2O as the precursors with no excess of LiOH·H2O. As-obtained material can be used to make electrode slurry directly with no need to wash, dry, and anneal. Electrochemical tests showed that the single-crystal NCM622 has a high specific capacity and a long cycle life. The first discharge capacity of the sample was 181.2 mAh·g-1 at 0.1C and 174.4 mAh·g-1 at 0.3C. Under a current density of 0.3C, the sample delivered a discharge capacity of 150.7 mAh·g-1 after 300 cycles with a capacity retention of 86.4%. After 500 cycles at 0.3C, a relatively high discharge capacity of 141.2 mAh·g-1 was still maintained with a capacity retention of 81.0%. The electrochemical performance of single-crystal NCM622 prepared at 910 ℃ was better than that of polycrystalline NCM622 prepared at 850 ℃ and large-size single-crystal NCM622 prepared at 940 and 960 ℃, indicating that the reasonable calcination temperature for single crystal NCM622 was 910 ℃. The results show that the structural stability of single-crystal NCM622 can be maintained during repeated cycling. | |
| Keywords: high nickel material single crystal cathode solid-state calcination lithium-ion battery electrochemistry | |
| 投稿时间：2021-11-25 修订日期：2022-01-04 | |
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| 陆勇刚,向波,汪镇涛,张鹏,陈芳,谢健,赵新兵.LiNi0.6Co0.2Mn0.2O2单晶的简易制备及其电化学性能[J].无机化学学报,2022,38(4):569-577. | |
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