高容量锂电池负极材料TiNb2O7的合成及其机理

doi:10.11901/1005.3093.2019.568

材料研究学报

2020, Vol. 34

Issue (5): 385-391 DOI: 10.11901/1005.3093.2019.568

研究论文

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高容量锂电池负极材料TiNb₂O₇的合成及其机理

谢礼兰(

), 杨冬升, 凌静

贵州师范大学材料与建筑工程学院贵阳 550001

Synthesis and Formation Mechanism of Lithium Battery High-Capacity Anode Material TiNb₂O₇

XIE Lilan(

), YANG Dongsheng, LING Jing

School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550001, China

引用本文:

谢礼兰, 杨冬升, 凌静. 高容量锂电池负极材料TiNb₂O₇的合成及其机理[J]. 材料研究学报, 2020, 34(5): 385-391.
Lilan XIE, Dongsheng YANG, Jing LING. Synthesis and Formation Mechanism of Lithium Battery High-Capacity Anode Material TiNb₂O₇[J]. Chinese Journal of Materials Research, 2020, 34(5): 385-391.

全文: PDF(4315 KB) HTML

摘要:

将TiNb₂O₇的前驱体在不同温度(400℃、800℃、900℃、1000℃和1100℃)煅烧，用固相合成法制备TiNb₂O₇负极材料并对其样品进行了TG-DSC、XRD和SEM表征和电化学性能测试。结果表明：在900℃煅烧前驱体，锐钛矿与Nb₂O₅反应的主要产物为Ti₂Nb₁₀O₂₉。Ti₂Nb₁₀O₂₉与金红石反应生成了TiNb₂O₇，生成纯单斜相TiNb₂O₇的最佳条件为在1100℃煅烧6 h。TiNb₂O₇负极材料在0.2C电流密度时初始容量为278.4 mAh/g，初始库伦效率为82.9%。TiNb₂O₇具有良好的倍率容量，在1C循环100次后容量保持率为89%。

关键词 ：材料合成与加工工艺, 锂离子电池, 固相法, TiNb₂O₇, 电化学性能

Abstract：

The precursor of TiNb₂O₇ is prepared via solid-phase synthesis with anatase and Nb₂O₅ as raw materials and then calcinated at 400℃, 800℃, 900℃, 1000℃ and 1100℃ respectively in air to prepare TiNb₂O₇ as electrode materials. The prepared materials are characterized by means of thermo-gravimetric analyzer, differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical test. The results show that the main reaction products of anatase and Nb₂O₅ at 900℃ is Ti₂Nb₁₀O₂₉. TiNb₂O₇ is obtained by the reaction of Ti₂Nb₁₀O₂₉ and rutile. The optimum calcination condition of pure monoclinic TiNb₂O₇ is 1100℃ for 8 h. TiNb₂O₇ anode material has an initial capacity of 278.4 mAh/g at 0.2C and the initial coulombic efficiency is 82.9%. In the meantime, TiNb₂O₇ has a good rate capacity, which can still reach 89% after 100 cycles at 1C rate.

Key words： synthesizing and processing technics for materials lithium-ion battery solid-phase synthesis TiNb₂O₇ electrochemical performance

收稿日期: 2019-12-05

ZTFLH:

TM912.9

基金资助:贵州省科技厅-贵州师范大学联合基金(LKS[2009]30)

作者简介: 谢礼兰，女，1979年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.568 或 https://www.cjmr.org/CN/Y2020/V34/I5/385

图1 TiNb2O7前驱体的TG-DSC曲线

图2 在不同温度合成的TiNb2O7的XRD图谱

表1 在不同温度合成的样品的XRD无标定量分析数据

图3 在900℃保温8 h和在1100℃保温8 h样品的X射线Rietveld精修图谱

表2 TiNb2O7 和 Ti2Nb10O29的晶格参数

图4 前驱体、在不同温度煅烧的TiNb2O7粉末的扫描电子显微镜图像及其相应的放大图像

图5 TiNb2O7电极的0.8-2.5 V电化学性能

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