双替代策略利用阳离子化和组装工艺,在Na-Ion电池的分层氧化物阴极中实现固体溶液反应
Zhijian Huang1, Mingpei Tan1, Ming Liu1
1School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|December 23, 2024
概括
这项研究引入了一种新的正极材料,Na0.67Ni0.18Cu0.10Zn0.05Mn0.67O2 (NNCZM),用于离子电池 (NIB). 与传统的NNM阴极相比,NNCZM材料显示出增强的稳定性和速度能力.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (NIB) 对电网规模的储能充满希望.
- Na0.67Ni0.33Mn0.67O2 (NNM) 阴极材料由于不可逆转的相变而遭受循环稳定性差.
- 这些转换导致电压平原,限制了NIB的性能.
研究的目的:
- 为了合成一种新的阴极材料用于NIB,提高了电化学性能.
- 为了解决NNM阴极的局限性,特别是循环稳定性和速率能力差.
- 研究双离子替代 (Cu2+和Zn2+) 对NNM的结构和电化学特性的影响.
主要方法:
- 合成Na0.67Ni0.18Cu0.10Zn0.05Mn0.67O2 (NNCZM) 通过一个离子化和重组过程.
- 与NNM和固态合成NNCZM (S-NNCZM) 的NNCZM的比较.
- 电化学表征包括放电能力,库伦比效率,循环稳定性和速率能力测试.
主要成果:
- 与S-NNCZM相比,NNCZM表现出更均的元素分布和增强的Na+扩散动力学.
- 对Ni2+进行Cu2+和Zn2+的双替代,防止P2-O2相转换,并消除Na空位排序.
- NNCZM在10mAg-1时达到110.2mAhg-1的放电容量,在200个周期内保持84.1%的容量,在2000mAg-1时达到61.0mAhg-1.
结论:
- 离子化和重组方法产生了优质的NNCZM阴极材料.
- 双阴离子替代有效地提高了基于NNM的阴极的结构稳定性和电化学性能.
- 作为NIB的高性能阴极材料,NNCZM显示出显著的潜力.
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