通过双位替代方法,增强超稳定的高Na含量P2型分层阴极材料,以零菌株阴极存储
Xiaoxia Yang1, Suning Wang1,2,3, Hang Li3
1School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, West Xianning Road, 710049, Xi'an, Shaanxi, China.
ACS nano
|September 15, 2023
概括
这项研究使用高含量和替代增强P2型层氧化物用于离子电池 (SIBs). 修改后的阴极表现出超稳定的循环和出色的速率性能,为先进的SIB铺平了道路.
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:
- P2型分层过渡金属 (TM) 氧化物 (NaTMO2) 由于其高速率能力和成本效益,是离子电池 (SIB) 的有希望的阴极材料.
- 然而,像Na+/空位排序和循环过程中的多个相变等固有的问题导致P2-Na的电压稳定性不佳.
研究的目的:
- 为了提高SIB的P2型层氧化物的结构稳定性和电化学性能.
- 为了研究高Na含量和Li双位置换对正极材料性能的影响.
主要方法:
- 合成了一种新的P2型分层氧化物Na0.80Li0.024[Li0.065Ni0.22Mn0.66]O2.
- 采用了高Na含量和Li双站点替代策略.
- 具有结构稳定性,Na-ion存储能力和使用各种技术的电化学性能.
主要成果:
- 联合策略促进了Mn氧化到更高的价值状态,改善了TM和Na离子的局部环境.
- 在循环中实现了近零应变 (ΔV = 0.7%) 操作和固体溶液反应.
- 证明了异常的速率性能 (87%在10°C保持比0.1°C) 和超稳定的循环 (73%在1000次循环后在2°C保持).
结论:
- 高Na含量和Li双位置换有效增强P2型阴极中的结构稳定性和Na-ion储存.
- 开发的材料展示了高性能和持久的离子电池的有希望的潜力.
- 提供了对设计超稳定阴极材料的电子和结构化学的见解,其中包括零应变的Na-ion存储.
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