期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 3, 页码 3793-3804出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17080
关键词
P2-Na0.67Ni0.33Mn0.67O2; Sn substitution; polypyrrole coating; sodium-ion batteries; cathode material
资金
- National Natural Science Foundation of China [21938005, 21573147]
- Science AMP
- Technology Commission of Shanghai Municipality [19DZ1205500]
- Natural Science Foundation of Shanghai [19ZR1424600]
- Zhejiang Key Research and Development Program [2020C01128]
In this study, the combination of slight Sn substitution and PPy coating on Na0.67Ni0.33Mn0.63Sn0.04O2@PPy (3.3 wt %) composite material showed excellent cycling stability, indicating a promising approach for achieving superior cycling stability for high-voltage layered transition metal oxides.
P2-Na0.67Ni0.33Mn0.67O2 presents high working voltage with a theoretical capacity of 173 mAh g(-1). However, the lattice oxygen on the particle surface participates in the redox reactions when the material is charged over 4.22 V. The resulting oxidized oxygen aggravates the electrolyte decomposition and transition metal dissolution, which cause severe capacity decay. The commonly reported cation substitution methods enhance the cycle stability by suppressing the high voltage plateau but lead to lower average working voltage and reduced capacity. Herein, we stabilized the lattice oxygen by a small amount of Sn substitution based on the strong Sn-O bond without sacrificing the high voltage performance and further protected the particle surface by polypyrrole (PPy) coating. The obtained Na0.67Ni0.33Mn0.63Sn0.04O2@PPy (3.3 wt %) composite showed excellent cycling stability with a reversible capacity of 137.6 (10) and 120.0 mAh (100 mA g(-1)) with a capacity retention of 95% (10 mA g(-1), 50 cycles) and 82.5% (100 mA g(-1), 100 cycles), respectively. The present work indicates that slight Sn substitution combined with PPy coating could be an effective approach to achieving superior cycling stability for high-voltage layered transition metal oxides.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据