Manganese Metaphosphate Mn(PO3)2 as a High‐Performance Negative Electrode Material for Lithium‐Ion Batteries,ChemElectroChem

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Manganese Metaphosphate Mn(PO3)2 as a High‐Performance Negative Electrode Material for Lithium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/celc.202000389
Qingbo Xia _{1,

2} , Pierre J. P. Naeyaert ₁ , Maxim Avdeev _{1,

2} , Siegbert Schmid ₁ , Hongwei Liu ₃ , Bernt Johannessen ₄ , Chris D. Ling ₁

Affiliation

We report a novel negative conversion electrode material, manganese (II) metaphosphate Mn(PO₃)₂. This compound can be synthesized by a facile solid‐state method, and after carbon‐coating delivers an attractively high reversible capacity of 477 mAh/g at 0.1 C and 385 mAh/g at 1 C. We investigated the reaction mechanism with a combination of ex situ X‐ray absorption spectroscopy, in situ X‐ray diffraction, and high‐resolution transmission electron microscopy. We observed a direct conversion process by monitoring the first discharge in operando , in which Mn(PO₃)₂ reacts with Li to give fusiform Mn nanograins a few Ångstroms in width, embedded in a matrix of lithium conducting LiPO₃ glass. Due to the fine nanostructures of the conversion products, this conversion reaction is completely reversible.

中文翻译：

偏磷酸锰Mn（PO3）2作为锂离子电池的高性能负极材料

我们报告了一种新型的负转换电极材料，偏磷酸锰（II）Mn（PO ₃）₂。该化合物可以通过简便的固态方法合成，碳包衣后在0.1 C时具有极高的可逆容量，即477 mAh / g，在1 C时具有385 mAh / g。我们研究了以下反应机理：非原位X射线吸收光谱，原位X射线衍射和高分辨率透射电子显微镜。我们观察到的直接转换过程通过监测第一放电在operando，其中的Mn（PO ₃）₂与锂起反应，使纤丝状锰纳米晶粒宽几埃，嵌入锂导电LiPO ₃玻璃基质中。由于转化产物的精细纳米结构，该转化反应是完全可逆的。

更新日期：2020-07-05

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