NASICON-Structured NaSn2(PO4)3 with Excellent High-Rate Properties as Anode Material for Lithium Ion Batteries

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• 作者：Pu Hu ; Jun Ma ; Tianshi Wang ; Bingsheng Qin ; Chuanjian Zhang ; Chaoqun Shang ; Jianghui Zhao ; Guanglei Cui
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：October 13, 2015
• 年：2015
• 卷：27
• 期：19
• 页码：6668-6674
• 全文大小：483K
• ISSN：1520-5002

文摘

Advanced Li-ion batteries with high rate properties are in high demand and have generated much attention in the research community. Here, we present a simple sol鈥揼el and solid-state reaction to synthesize NASICON-structured NaSn₂(PO₄)₃ as anode material for lithium-ion batteries. The obtained material exhibits excellent cycling performance and high rate capacity for half cell and LiFePO₄/NaSn₂(PO₄)₃ full cell. Cyclic voltammograms (CV) and galvanostatic intermittent titration technique (GITT) were used to analyze the kinetics and thermodynamics of the electrode. Morphology and structure evolution of the NaSn₂(PO₄)₃ electrode after cycling were explored by transmission electron microscopy (TEM). These results showed nanoscale Sn was uniformly dispersed in the lithium phosphate matrix during the first discharge. It is proposed that the enhanced properties are attributed to the 鈥渋n situ鈥?formation of the ionic conductor as protective matrices, which prevents the aggregation of nanoparticles during the cycling and provides Li⁺ diffusion channels in the electrode for fast electrochemical reaction.