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用于锂离子电池的Mg/Zr改性LiNiMnO正极的电子-离子传输特性评估

Evaluation of Electronic-Ionic Transport Properties of a Mg/Zr-Modified LiNiMnO Cathode for Li-Ion Batteries.

作者信息

Balducci Leonardo, Darjazi Hamideh, Gonzalo Elena, Cid Rosalía, Bonilla Francisco, Nobili Francesco

机构信息

School of Science and Technology─Chemistry Division, University of Camerino, Via Madonna delle Carceri, ChIP, 62032 Camerino, Italy.

GISEL─Centro di Riferimento Nazionale per i Sistemi di Accumulo Elettrochimico di Energia, INSTM, via G. Giusti 9, 50121 Firenze, Italy.

出版信息

ACS Appl Mater Interfaces. 2023 Dec 6;15(48):55620-55632. doi: 10.1021/acsami.3c10480. Epub 2023 Nov 20.

DOI:10.1021/acsami.3c10480
PMID:37983386
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10711703/
Abstract

There is an enormous drive for moving toward cathode material research in LIBs due to the proposal of zero-emission electric vehicles together with the restriction of cathode materials in design. LiNiMnO (LNMO) attracts great research interests as high-voltage Co-free cathodes in LIBs. However, a more extensive study is required for LNMO due to its poor electrochemical performance, especially at high temperature, because of the instability of the LNMO interface. Herein, we design structural modifications using Mg and Zr to alleviate the above-mentioned drawbacks by limiting Mn dissolution and tailoring interstitial sites (which are shown by structural and electrochemical characterizations). This strategy enhances the cycle life up to 1000 cycles at both 25 and 50 °C. In addition, a thorough characterization by impedance spectroscopy is applied to give an insight into the electronic and ionic transport properties and the intricate phase transitions occurring upon oxidation and reduction.

摘要

由于零排放电动汽车的提议以及阴极材料在设计上的限制，锂离子电池（LIBs）的阴极材料研究面临着巨大的推动。LiNiMnO（LNMO）作为LIBs中的高压无钴阴极吸引了大量研究兴趣。然而，由于LNMO的电化学性能较差，特别是在高温下，由于LNMO界面的不稳定性，因此需要对其进行更广泛的研究。在此，我们设计了使用Mg和Zr的结构改性，通过限制Mn溶解和调整间隙位置（通过结构和电化学表征显示）来缓解上述缺点。该策略在25和50°C下均将循环寿命提高至1000次循环。此外，应用阻抗谱进行全面表征，以深入了解电子和离子传输特性以及氧化和还原时发生的复杂相变。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/76b8/10711703/8a594f53d9ff/am3c10480_0009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/76b8/10711703/8a594f53d9ff/am3c10480_0009.jpg

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本文引用的文献

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Phase transformation mechanism in lithium manganese nickel oxide revealed by single-crystal hard X-ray microscopy.通过单晶硬 X 射线显微镜揭示锂锰镍氧化物中的相变机制。
Nat Commun. 2017 Feb 1;8:14309. doi: 10.1038/ncomms14309.
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Nickel-rich layered lithium transition-metal oxide for high-energy lithium-ion batteries.高能量锂离子电池用富镍层状锂过渡金属氧化物。
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