评价不同煅烧温度下层状NaxMn0.5Co0.5O2的电化学性能

IF 2.8 Q2 ENGINEERING, CHEMICAL
L. Nguyen, V. Nguyen, Doan My Ngoc Nguyen, Minh Kha Le, V. Tran, M. Le
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引用次数: 0

摘要

P型层状氧化物由于其高比容量和倍率能力,最近成为钠离子电池(NIBs)的有前途的候选者。本工作阐明了在650、800和900°C下煅烧x~1的层状正极材料NaxMn0.5Co0.5O2(NMC)的结构和电化学性能。XRD衍射表明,NMC材料在中温下具有从P3型向P2型层状结构的相变,具有双相P3/P2。评价了不同相的钠储存行为。结果表明,温度的升高提高了比容量和循环稳定性。P2-NMC在100次循环后表现出最高的初始容量156.9 mAh·g−1,容量保持率为76.2%,优于仅149.3 mAh·g-1的初始放电容量和P3-NMC每循环严重的容量衰减,表明在较高的煅烧温度下具有较高的结构稳定性。不太稳定的结构也有助于P3相在高电流密度下的快速退化。因此,高温P2相在钠存储性能方面仍然是最好的。此外,通过循环伏安法(CV)计算了钠的扩散系数,证明了两相的协同作用促进了钠离子的迁移。硬碳||P2-NMC在25次循环后的容量为80.9 mAh·g−1,容量保持率为63.3%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating Electrochemical Properties of Layered NaxMn0.5Co0.5O2 Obtained at Different Calcined Temperatures
P-type layered oxides recently became promising candidates for Sodium-ion batteries (NIBs) for their high specific capacity and rate capability. This work elucidated the structure and electrochemical performance of the layered cathode material NaxMn0.5Co0.5O2 (NMC) with x~1 calcined at 650, 800 and 900 °C. XRD diffraction indicated that the NMC material possessed a phase transition from P3- to P2-type layered structure with bi-phasic P3/P2 at medium temperature. The sodium storage behavior of different phases was evaluated. The results showed that the increased temperature improved the specific capacity and cycling stability. P2-NMC exhibited the highest initial capacity of 156.9 mAh·g−1 with capacity retention of 76.2% after 100 cycles, which was superior to the initial discharge capacity of only 149.3 mAh·g−1 and severe capacity fading per cycle of P3-NMC, indicating high robust structure stability by applying higher calcination temperature. The less stable structure also contributed to the fast degradation of the P3 phase at high current density. Thus, the high temperature P2 phase was still the best in sodium storage performance. Additionally, the sodium diffusion coefficient was calculated by cyclic voltammetry (CV) and demonstrated that the synergic effect of the two phases facile the sodium ion migration. Hard carbon||P2-NMC delivered a capacity of 80.9 mAh·g−1 and 63.3% capacity retention after 25 cycles.
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来源期刊
ChemEngineering
ChemEngineering Engineering-Engineering (all)
CiteScore
4.00
自引率
4.00%
发文量
88
审稿时长
11 weeks
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