Li-O_2电池阴极催化剂LaFeO_3纳米粒子的制备及电化学性能研究
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- 英文论文题名：LaFeO_3 nanoparticle as electrocatalysts of non-aqueous Li-O_2 batteries
- 论文作者：张晓茹 ; 许跃峰 ; 陈媛 ; 黄令 ; 李君涛 ; 孙世刚
- 英文论文作者：Xiaoru Zhang ; Y.F.Xu ; Y.Chen ; L.Huang ; J.T.Li ; S.G.Sun ; Department of Chemistry ; University of Xiamen ; College of Energy ; University of Xiamen
- 年：2016
- 作者机构：厦门大学化学化工学院化学系;厦门大学能源学院;
- 论文关键词：Li-O_2电池 ; 钙钛矿 ; 阴极催化剂 ; LaFeO_3纳米粒子
- 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-第三十分会：化学电源
- 语种：中文
- 分类号：O643.36;TQ133.3
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 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：372k
- 原文格式：D
- 会议级别：全国
摘要
非水体系的Li-O_2电池基于Li和O_2生成Li_2O_2的可逆反应,可提供高达3505wh/kg的理论比能量,在动力电池和储能电池领域受到很高的重视。然而,不导电化合物Li_2O_2在阴极的堆积,极易造成电池在高电流密度或深度充放电条件下极化过大,循环效率偏低,无法长期循环。对氧析出反应(OER)和氧还原反应(ORR)具有双功能催化活性的阴极催化剂是解决问题的关键。由混合金属氧化物构成的钙钛矿材料,成本低廉,电子/离子导电性优良,电化学稳定性高,结构易于调控,催化活性高,已被证明在碱性条件下同时具有ORR和OER双功能催化活性,目前也逐步地被研究应用于非水体系。本研究采用溶胶凝胶法,以柠檬酸为络合剂,将金属硝酸盐溶解在乙二醇和水的混合溶液中,通过调控pH和焙烧条件,得到LaFeO_3纳米粒子。经SEM表征,LaFeO_3纳米粒子呈100 nm左右的椭球形形貌。以该材料作为阴极组装成Li-O_2电池,实验结果显示:当控制放电容量为500mAh g~(-1)、以50mAg~(-1)的电流密度进行充放电,可以在较低的充电电压下实现30周的稳定循环。
Aprotic Li-oxygen batteries based on the reversible reaction of Li and O_2 to form Li_2O_2 can theoretically deliver an energy density of 3505 wh/kg,which received high attention in power batteries and energy storage batteries.However,the reversible chemistry with a high current efficiency over several cycles has not yet been achieved due to the deposition of nonconducting discharge products Li_2O_2.Here,we report the synthesis of LaFeO_3 nanoparticle with 100 nm ellipsoid shape.This oxide shows promising catalytic activity,the batteries can demonstrate 30 stable cycles at a current density of 50 mA g~(-1),with a fixed capacity of 500 mAh g~(-1).This good performance can attribute to both intrinsic property of LaFeO_3 and its highly active nanostructure.
Aprotic Li-oxygen batteries based on the reversible reaction of Li and O_2 to form Li_2O_2 can theoretically deliver an energy density of 3505 wh/kg,which received high attention in power batteries and energy storage batteries.However,the reversible chemistry with a high current efficiency over several cycles has not yet been achieved due to the deposition of nonconducting discharge products Li_2O_2.Here,we report the synthesis of LaFeO_3 nanoparticle with 100 nm ellipsoid shape.This oxide shows promising catalytic activity,the batteries can demonstrate 30 stable cycles at a current density of 50 mA g~(-1),with a fixed capacity of 500 mAh g~(-1).This good performance can attribute to both intrinsic property of LaFeO_3 and its highly active nanostructure.
引文
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