阴极
法拉第效率
电化学
材料科学
电池(电)
钠离子电池
兴奋剂
离子
相(物质)
结构稳定性
功率密度
氧化物
化学工程
分析化学(期刊)
化学
电极
热力学
光电子学
色谱法
功率(物理)
物理化学
有机化学
冶金
工程类
物理
结构工程
作者
Jingkai Zhou,Jing Liu,Yanyan Li,Zhongjun Zhao,Pengfei Zhou,Xiaozhong Wu,Xusheng Tang,Jin Zhou
标识
DOI:10.1016/j.jcis.2023.02.001
摘要
The P2/O3 biphasic layered oxide (NaxMn1-yMyO2, M: doping elements) is a cathode family with great promise for sodium-ion batteries (SIBs) because of their tunable electrochemical performance and low cost. However, the ultrahigh initial coulombic efficiency (ICE) and inferior cycling performance of P2/O3-NaxMn1-yMyO2 need to be improved for practical application. Herein, Ni/Cu co-doped P2/O3-Na0.75Mn1-yNiy-zCuzO2 materials are well-designed. The ultrahigh ICE can be restrained by altering the ratio of P2/O3 via adjusting Ni content, and the structural stability can be improved by Cu doping via enlarging parameter c of O3 phase and suppressing irreversible P2-O2 phase transformation. The optimal P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 delivers a capacity of 142.4 with ICE of 107.8%, superior capacity retention in the temperature range of -40 ∼ 30 °C, and rate performance of 95.9 mAh g-1 at 1.2 A g-1. The overall storage mechanism of P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 is revealed by the combination of electrochemical profiles, in situ X-ray diffraction, and first-principles calculations. The Na-ion full battery based on P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 cathode can achieve a remarkable energy density of 306.9 Wh kg-1 with a power density of 695.5 W kg-1 at 200 mA g-1. This work may shed light on the rational design of high-performance P2/O3 biphasic layered cathode for SIBs.
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