Boosting LiMn2O4 Diffusion Coefficients and Stability via Fe/Mg Doping and MWCNT Synergistically Modulating Microstructure

IF 3.9 Q2 NANOSCIENCE & NANOTECHNOLOGY
Natasha Ross, S. Willenberg, Thando Juqu, E. Carleschi, Bryan P. Doyle
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Abstract

The dissolution of manganese and its deposition on the anode surface cause poor cycling stability in lithium-ion batteries. To alleviate these issues, this study probes the electrochemical activity of highly crystalline and cation-adjusted lithium manganese oxide (LMO) carbon spinel composite obtained via a modified sol-gel synthesis procedure. The pristine LMO cathode was functionalized with a Fe and Mg alloy and fused with purified multiwalled carbon nanotubes (MWCNTs) to form a catalytically stabilized LiMn1.98Fe0.01Mg0.01O4/MWCNT (LMO-FeMg/MWCNT) framework. High-resolution SEM analysis showed well-dispersed particles in the nanometer size range. The electrochemical characteristics of the novel composite materials yielded favourable electrochemical results with diffusion coefficients of 1.91 × 10−9 cm2·s−1 and 5.83 × 10−10 cm2·s−1 for LMO-FeMg and LMO-FeMg/MWCNT, respectively. This improvement was supported by impedance studies which showed a considerable Rct reduction of 0.27 Ω and 0.71 Ω. The cation stabilized system outperformed the pristine LMO material with specific capacities around 145 mAh·g−1, due to an enhancement in electrochemical activity and structural stability.
通过掺杂铁/镁和 MWCNT 协同调节微结构提高锰酸锂扩散系数和稳定性
锰的溶解及其在负极表面的沉积会导致锂离子电池循环稳定性差。为了缓解这些问题,本研究采用改良的溶胶-凝胶合成工艺,探究了高结晶性和阳离子调整型锂锰氧化物(LMO)碳尖晶石复合材料的电化学活性。原始 LMO 正极被铁和镁合金功能化,并与纯化的多壁碳纳米管(MWCNT)融合,形成催化稳定的锰酸锂 1.98Fe0.01Mg0.01O4/MWCNT (LMO-FeMg/MWCNT)框架。高分辨率 SEM 分析表明,颗粒在纳米级范围内分散良好。新型复合材料的电化学特性产生了良好的电化学结果,LMO-FeMg 和 LMO-FeMg/MWCNT 的扩散系数分别为 1.91 × 10-9 cm2-s-1 和 5.83 × 10-10 cm2-s-1。阻抗研究证实了这一改进,阻抗研究显示 Rct 显著降低了 0.27 Ω 和 0.71 Ω。由于电化学活性和结构稳定性的提高,阳离子稳定体系的比容量超过了原始 LMO 材料,约为 145 mAh-g-1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Nanotechnology
Journal of Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-
CiteScore
5.50
自引率
2.40%
发文量
25
审稿时长
13 weeks
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