材料科学
阴极
电化学
扩散
化学工程
容量损失
锂(药物)
兴奋剂
离子
多孔性
纳米技术
电极
复合材料
光电子学
化学
内分泌学
工程类
物理化学
物理
有机化学
热力学
医学
作者
Guojie Chen,Haocheng Ji,Hui Fang,Jingjun Zhai,Zhewen Ma,Wenxin Ji,Yinchao Wang,Yuxiang Huang,Lele Liu,Wenxin Tong,Wen Zeng,Yinguo Xiao
标识
DOI:10.1021/acsami.3c06375
摘要
Sodium-ion batteries (SIBs) have garnered extensive attentions in recent years as a low-cost alternative to lithium-ion batteries. However, achieving both high capacity and long cyclability in cathode materials remains a challenge for SIB commercialization. P3-type Na0.67Ni0.33Mn0.67O2 cathodes exhibit high capacity and prominent Na+ diffusion kinetics but suffer from serious capacity decay and structural deterioration due to stress accumulation and phase transformations upon cycling. In this work, a dual modification strategy with both morphology control and element doping is applied to modify the structure and optimize the properties of the P3-type Na0.67Ni0.33Mn0.67O2 cathode. The modified Na0.67Ni0.26Cu0.07Mn0.67O2 layered cathode with hollow porous microrod structure exhibits an excellent reversible capacity of 167.5 mAh g-1 at 150 mA g-1 and maintains a capacity above 95 mAh g-1 after 300 cycles at 750 mA g-1. For one thing, the specific morphology shortens the Na+ diffusion pathway and releases stress during cycling, leading to excellent rate performance and high cyclability. For another, Cu doping at the Ni site reduces the Na+ diffusion energy barrier and mitigates unfavorable phase transitions. This work demonstrates that the electrochemical performance of P3-type cathodes can be significantly improved by applying a dual modification strategy, resulting in reduced stress accumulation and optimized Na+ migration behavior for high-performance SIBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI