Lithium Germanate (Li₂GeO₃): A High-Performance Anode Material for Lithium-Ion Batteries

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• 作者：Dr. Md Mokhlesur Rahman ; Irin Sultana ; Dr. Tianyu Yang ; Dr. Zhiqiang Chen ; Dr. Neeraj Sharma ; Dr. Alexey M. Glushenkov and Prof. Ying Chen
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：December 23, 2016
• 年：2016
• 卷：55
• 期：52
• 页码：16059-16063
• 全文大小：4317K
• ISSN：1521-3773

文摘

A simple, cost-effective, and easily scalable molten salt method for the preparation of Li₂GeO₃ as a new type of high-performance anode for lithium-ion batteries is reported. The Li₂GeO₃ exhibits a unique porous architecture consisting of micrometer-sized clusters (secondary particles) composed of numerous nanoparticles (primary particles) and can be used directly without further carbon coating which is a common exercise for most electrode materials. The new anode displays superior cycling stability with a retained charge capacity of 725 mAh g⁻¹ after 300 cycles at 50 mA g⁻¹. The electrode also offers excellent rate capability with a capacity recovery of 810 mAh g⁻¹ (94 % retention) after 35 cycles of ascending steps of current in the range of 25–800 mA g⁻¹ and finally back to 25 mA g⁻¹. This work emphasizes the importance of exploring new electrode materials without carbon coating as carbon-coated materials demonstrate several drawbacks in full devices. Therefore, this study provides a method and a new type of anode with high reversibility and long cycle stability.