Kinetics and Structural Investigation of Layered Li9V3(P2O7)3(PO4)2 as a Cathode Material for Li‐Ion Batteries,ChemElectroChem

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Kinetics and Structural Investigation of Layered Li9V3(P2O7)3(PO4)2 as a Cathode Material for Li‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-03 , DOI: 10.1002/celc.201700734
Prasanth Balasubramanian ₁ , Marilena Mancini ₁ , Holger Geßwein ₂ , Dorin Geiger ₃ , Peter Axmann ₁ , Ute Kaiser ₃ , Margret Wohlfahrt-Mehrens ₁

Affiliation

Cathode materials with improved safety and energy densities are required for developing next‐generation Li‐ion battery technology. Among different phosphate‐based materials, layered Li₉V₃(P₂O₇)₃(PO₄)₂ (LVPP) has recently been explored as a high‐voltage cathode. We report the feasibility of multi‐electron reactions and the influence of crystallite size on the electrode kinetics. The mechanism of Li extraction/insertion during charge and discharge is investigated and the structural transformations at high voltages are studied by means of in situ and ex situ analysis. The changes induced by electrochemical Li extraction are found to be reversible during cycling in the potential window of 2–4.6 V, whilst voltage profile changes and capacity fading is observed by charging up to 4.8 V, owing to irreversible phase transition and reduction of the interlayer distance. The findings can be applied for optimizing material synthesis as well as the working conditions in Li‐ion battery applications.

中文翻译：

层状Li9V3（P2O7）3（PO4）2作为锂离子电池正极材料的动力学和结构研究

开发下一代锂离子电池技术需要具有改善的安全性和能量密度的阴极材料。在不同的磷酸盐基材料中，层状Li ₉ V ₃（P ₂ O ₇）₃（PO ₄）₂（LVPP）最近被探索为高压阴极。我们报告了多电子反应的可行性以及微晶尺寸对电极动力学的影响。研究了锂在充放电过程中的引出/插入机理，并通过原位和异位分析研究了高压下的结构转变。发现电化学Li提取引起的变化在2–4.6 V的电势窗口中循环期间是可逆的，而由于不可逆的相变和中间层的减少，通过充电至4.8 V可以观察到电压曲线的变化和容量衰减。距离。这些发现可用于优化材料合成以及锂离子电池应用中的工作条件。

更新日期：2017-11-03

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