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首页> 外文期刊>ACS applied materials & interfaces >Mechanism Study of Carbon Coating Effects on Conversion-Type Anode Materials in Lithium-Ion Batteries: Case Study of ZnMn2O4 and ZnO-MnO Composites
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Mechanism Study of Carbon Coating Effects on Conversion-Type Anode Materials in Lithium-Ion Batteries: Case Study of ZnMn2O4 and ZnO-MnO Composites

机译：锂离子电池转化型阳极材料碳涂层作用的机制研究：ZnMN2O4和ZnO-MnO复合材料的情况研究

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摘要

The carbon coating strategy is intensively used in the modification of conversion-type anode materials to improve their cycling stability and rate capability. Thus, it is necessary to elucidate the modification mechanism induced by carbon coating. For this purpose, bare ZnMn2O4, carbon-derivative-coated ZnMn2O4, and carbon-coated ZnO-MnO composite materials have been synthesized and investigated in-depth. Herein, high-temperature synchrotron radiation diffraction is used to monitor the phase transition from ZnMn2O4 to ZnO-MnO composite during the carbonization process. The electrochemical performance has been evaluated by cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy. The carbon- and carbon-derivative-coated samples display well-improved cycling stability in terms of suppressed electrode polarization, a moderate increase in resistance, and slight capacity variation. The influence of carbon coating on the intrinsic conversion process is investigated by ex situ X-ray absorption spectroscopy, which reveals the evolution of Zn and Mn oxidation states. This result confirms that the strong capacity variation of the bare ZnMn2O4 is induced not only by the reversible charge storage in the solid electrolyte interphase but also by the phase evolution of active materials. Carbon coating is an effective method to prevent the additional oxidation of MnO to Mn3O4, which leads to a stabilization of the main conversion reaction.
机译：碳涂层策略在转换型阳极材料的改性中密集用于改善其循环稳定性和速率能力。因此，有必要阐明通过碳涂层诱导的修饰机制。为此目的，已经合成并研究了裸ZnMN2O4，碳衍生物涂覆的ZnMN2O4和碳涂覆的ZnO-MNO复合材料并深入研究。这里，高温同步辐射衍射用于在碳化过程中监测从ZnMN2O4到ZnO-MnO复合物的相转变。通过循环伏安法，电镀循环和电化学阻抗光谱评估电化学性能。碳和碳衍生物涂覆的样品在抑制电极极化方面显示出良好改善的循环稳定性，抗性的中等增加和略微容量变化。采用原位X射线吸收光谱研究了碳涂层对本质转化过程的影响，揭示了Zn和Mn氧化态的演变。该结果证实，裸ZnMN2O4的强容量变化不仅由固体电解质间相之间的可逆电荷存储而诱导，而且还通过活性材料的相位演化而诱导。碳涂层是防止MnO至Mn3O4的额外氧化的有效方法，这导致了主要转化反应的稳定性。

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