Improving the Electrochemical Performance of Ni-Rich LiNi0.8Co0.1Mn0.1O2 Cathodes by Suitable Sintering Temperature

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Yanyan Li, Xiaobo Hong, Ping Jiang, Jianfei Tu, Zhijun Qiao* and Dianbo Ruan*, 
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Abstract

Ni-rich layered LiNixCoyMnzO2 (NCM, x ≥ 0.6) is one of the most competitive cathode materials due to its high energy density. However, its fast capacity fading, high voltage instability, serious parasitic reactions, phase transitions, and loss of active substances hinder further large-scale applications. In this work, we used the highest sintering temperature for LiNi0.8Co0.1Mn0.1O2 material (named NCM811). NCM811-800 °C which was sintered at 800 °C for 10 h significantly enhanced the materials’ structural stability due to the suppression of the cathode materials degradation during cycling. Correspondingly, NCM811-800 °C shows the best electrochemical performance among four samples, ∼81.3% (161.6 mAh/g) with a rate of 0.5C after 200 cycles, much higher than that of the worst sample NCM811-750 °C, only remaining 89.1 mAh/g (about 48.2% capacity retention). Meanwhile, the rate capacity of NCM811-800 °C also presents superior stability (97.6, 89.9, 81.1, and 43.6% under 0.1, 0.5, 1, 2, and 5C) with improving the structural stability of cathodes. Our work provides a practical method to improve the electrochemical properties of Ni-rich layered structure cathode by suitable sintering temperature.

Abstract Image

合适的烧结温度提高富镍LiNi0.8Co0.1Mn0.1O2阴极的电化学性能
富镍层状LiNixCoyMnzO2 (NCM, x≥0.6)因其高能量密度而成为极具竞争力的正极材料之一。然而,其容量衰减快、电压不稳定、寄生反应严重、相变和活性物质损失等问题阻碍了其进一步大规模应用。在这项工作中,我们使用了LiNi0.8Co0.1Mn0.1O2材料(命名为NCM811)的最高烧结温度。在800℃下烧结10 h的NCM811-800℃,由于抑制了正极材料在循环过程中的降解,显著提高了材料的结构稳定性。相应地,NCM811-800°C在4个样品中表现出最好的电化学性能,在循环200次后,0.5C的倍率下,其电化学性能为~ 81.3% (161.6 mAh/g),远高于最差的NCM811-750°C样品,仅剩余89.1 mAh/g(约48.2%的容量保留)。同时,NCM811-800°C的倍率容量在0.1、0.5、1、2和5C下的稳定性分别为97.6、89.9、81.1和43.6%,提高了阴极的结构稳定性。本研究为提高富镍层状结构阴极的电化学性能提供了一种可行的方法。
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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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