Visualization of crystal plane selectivity for irreversible phase transition in MnO@C anode.,Chemical Communications

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Visualization of crystal plane selectivity for irreversible phase transition in MnO@C anode.
Chemical Communications ( IF 4.3 ) Pub Date : 2020/02/24 , DOI: 10.1039/d0cc00373e
Tong Zhou ₁ , Liang Chang , Weiqin Li , Chao Li , Wenjuan Yuan , Cuihua An , Jun Luo

Affiliation

Transition metal oxides are widely regarded as one of the most promising candidates for lithium-ion battery (LIB) anodes. However, the mechanisms of irreversible reactions occurring during the charging/discharging process are still controversial. In this study, the atomic structural transitions of the MnO@C anode upon lithiation/delithiation at the first cycle of charging and discharging are elucidated. Based on the quantities of Li embedded and released in different states, the anisotropy of the crystal plane of lithiation/delithiation in MnO is directly observed. We determine that lithium ions can be completely inserted into/extracted from MnO(220), while this cannot be achieved in MnO(200), which is the main reason for capacity degradation. This study reveals the reaction mechanisms and structural evolution in the electrochemical reactions of MnO@C anode materials during lithiation and delithiation. Additionally, it also provides guidance for the fabrication and optimization of MnO-based materials for LIBs in the future.

中文翻译：

MnO @ C阳极不可逆相变的晶面选择性可视化。

过渡金属氧化物被广泛认为是锂离子电池（LIB）阳极最有希望的候选材料之一。然而，在充电/放电过程中发生的不可逆反应的机理仍然是有争议的。在这项研究中，阐明了在充电和放电的第一个循环中锂化/脱锂时MnO @ C阳极的原子结构转变。基于在不同状态下嵌入和释放的Li的数量，可以直接观察到MnO中锂化/脱锂晶面的各向异性。我们确定锂离子可以完全插入MnO（220）或从中提取，而MnO（200）则无法实现，这是容量降低的主要原因。这项研究揭示了MnO @ C阳极材料在锂化和脱锂过程中的电化学反应的反应机理和结构演变。此外，它还为将来用于LIB的MnO基材料的制造和优化提供指导。

更新日期：2020-03-31

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