无模板水热法一步制备锐钛矿TiO_2空心球及其储锂性能
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- 英文论文题名：Template-free Hydrothermal Method of Anatase TiO_2 Hollow Spheres for Lithium Storage
- 论文作者：师帅 ; 陈阳 ; 崔晓莉 ; 江志裕
- 英文论文作者：Shuai Shi ; Yang Chen ; Xiaoli Cui ; Zhiyu Jiang ; Fudan University
- 年：2016
- 作者机构：复旦大学;
- 论文关键词：锂离子电池 ; 二氧化钛 ; 空心球结构
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：O646;O614.411
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：374k
- 原文格式：D
- 会议级别：全国
摘要
二氧化钛(TiO_2)具有良好的嵌锂脱锂性能,较低的成本及环境友好等特性,被认为是一种具有发展前景的锂离子电池负极材料。而空心球结构材料具有极大的比表面积,较低的密度,使得空心球结构的TiO_2材料具有更快的锂离子传输能力。本文以钛酸四正丁酯为前驱体,在碳酸氢铵的存在下通过一种新型的无模板剂的水热法一步合成了具有空心球结构的TiO_2。钛酸丁酯与碳酸氢铵受热分解后的水蒸汽发生水解反应,在氨气与二氧化碳气氛下,形成空心球结构的TiO_2,并且无需经过退火即可得到锐钛矿晶型的TiO_2。所得空心球直径在1-4μm之间(图1),在300mA g~(-1)电流密度下,该空心球结构的TiO_2100次充放电循环后比容量仍有142.8mA h g~(-1)(图1)。本文制备方法成本较低,操作简便,该方法也为制备其他电极材料的制备提供了新的思路。
Hollow structural TiO_2 possess high specific surface area, which is beneficial to the fast transport of Li ions. In this work, TiO_2hollow microspheres were successfully synthesized by employing tetrabutyl orthotitanate as a precursor via a template-free hydrothermal method with the presence of NH_4HCO_3at250℃. Anatase phase can be directly obtained without any post annealing. The diameter of hollow TiO_2 particles is in range of 1.0-4.0 μm(Fig. 1). A high reversible capacity of 142.8mA h g~(-1) at 300 mA g~(-1) after 100 cycles can be achieved for the hollow TiO_2 microspheres(Fig. 1). Considering the features of low cost and simple preparation, the proposed template-free method would have bright prospects for synthesizing other electrode materials.
Hollow structural TiO_2 possess high specific surface area, which is beneficial to the fast transport of Li ions. In this work, TiO_2hollow microspheres were successfully synthesized by employing tetrabutyl orthotitanate as a precursor via a template-free hydrothermal method with the presence of NH_4HCO_3at250℃. Anatase phase can be directly obtained without any post annealing. The diameter of hollow TiO_2 particles is in range of 1.0-4.0 μm(Fig. 1). A high reversible capacity of 142.8mA h g~(-1) at 300 mA g~(-1) after 100 cycles can be achieved for the hollow TiO_2 microspheres(Fig. 1). Considering the features of low cost and simple preparation, the proposed template-free method would have bright prospects for synthesizing other electrode materials.
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