Li2Co1- x M x PO4F (M = Fe, Mn) 正极材料的合成与电化学性能。

Synthesis and electrochemical performance of Li2Co1- x M x PO4F (M = Fe, Mn) cathode materials.

机构信息

Department of Chemistry, Moscow State University, Moscow 119991, Russia.

出版信息

Beilstein J Nanotechnol. 2013 Dec 9;4:860-7. doi: 10.3762/bjnano.4.97. eCollection 2013.

DOI:10.3762/bjnano.4.97

PMID:24367755

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3869263/

Abstract

In the search for high-energy materials, novel 3D-fluorophosphates, Li2Co1- x Fe x PO4F and Li2Co1- x Mn x PO4F, have been synthesized. X-ray diffraction and scanning electron microscopy have been applied to analyze the structural and morphological features of the prepared materials. Both systems, Li2Co1- x Fe x PO4F and Li2Co1- x Mn x PO4F, exhibited narrow ranges of solid solutions: x ≤ 0.3 and x ≤ 0.1, respectively. The Li2Co0.9Mn0.1PO4F material demonstrated a reversible electrochemical performance with an initial discharge capacity of 75 mA·h·g(-1) (current rate of C/5) upon cycling between 2.5 and 5.5 V in 1 M LiBF4/TMS electrolyte. Galvanostatic measurements along with cyclic voltammetry supported a single-phase de/intercalation mechanism in the Li2Co0.9Mn0.1PO4F material.

摘要

在寻找高能材料的过程中，合成了新型三维氟磷酸盐 Li2Co1- x Fe x PO4F 和 Li2Co1- x Mn x PO4F。X 射线衍射和扫描电子显微镜被用来分析所制备材料的结构和形态特征。在 Li2Co1- x Fe x PO4F 和 Li2Co1- x Mn x PO4F 两个体系中，固溶度范围都很窄：x ≤ 0.3 和 x ≤ 0.1。Li2Co0.9Mn0.1PO4F 材料在 2.5 至 5.5 V 之间循环时，在 1 M LiBF4/TMS 电解液中以 C/5 的电流速率循环，具有初始放电容量为 75 mA·h·g(-1) 的可逆电化学性能。恒电流测量和循环伏安法支持 Li2Co0.9Mn0.1PO4F 材料中单相脱嵌插机制。