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[1]俞娟,杨帅,孔伟,等.LiFePO4改性聚酰亚胺凝胶碳化材料的制备及其电化学性能[J].南京工业大学学报(自然科学版),2019,41(04):403-410.[doi:10.3969/j.issn.1671-7627.2019.04.001]
 YU Juan,YANG Shuai,KONG Wei,et al.Preparation and electrochemical performance of LiFePO4 modified polyimide gel carbonized material[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2019,41(04):403-410.[doi:10.3969/j.issn.1671-7627.2019.04.001]
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LiFePO4改性聚酰亚胺凝胶碳化材料的制备及其电化学性能()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
41
期数:
2019年04期
页码:
403-410
栏目:
出版日期:
2019-07-24

文章信息/Info

Title:
Preparation and electrochemical performance of LiFePO4 modified polyimide gel carbonized material
文章编号:
1671-7627(2019)04-0403-08
作者:
俞娟1杨帅2孔伟2王瑶13王晓东13黄培13
1. 南京工业大学 先进聚合物材料研究所,江苏 南京 211800; 2. 火箭军驻长征航天控制工程公司军代室,北京 100071; 3. 南京工业大学 材料化学工程国家重点实验室,江苏 南京 211800
Author(s):
YU Juan1YANG Shuai2KONG Wei2WANG Yao13WANG Xiaodong13HUANG Pei13
1. Institute of Advanced Polymer Materials, Nanjing Tech University, Nanjing 210009, China; 2. Army Representative Office of the PLA Rocket Force in Long March Aerospace Control Engineering Company, Beijing 100071, China; 3. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211800, China
关键词:
磷酸铁锂 聚酰亚胺凝胶 碳化材料 电化学性能
Keywords:
LiFePO4 polyimide gel carbonized material electrochemical performance
分类号:
TQ323.7
DOI:
10.3969/j.issn.1671-7627.2019.04.001
文献标志码:
A
摘要:
以FeSO4、LiOH和NH4H2PO4为原料,控制反应物物质的量之比n(Li+):n(Fe2+):n(PO3+4)=3:1:1,采用水热法制备磷酸铁锂(LiFePO4)颗粒,并对合成工艺进行优化; 以LiFePO4为填料,将LiFePO4加入聚酰亚胺(PI)凝胶材料中,采用高温热解工艺制备LiFePO4改性聚酰亚胺凝胶碳化材料。通过傅里叶变换红外光谱仪(FT-IR)、X线衍射仪(XRD)、扫描电子显微镜(SEM)、比表面积孔隙分析仪及电化学工作站对LiFePO4的结构、形貌及复合材料的电化学性能进行表征。LiFePO4颗粒的最优制备条件如下:加料顺序为LiOH、NH4H2PO4、抗坏血酸(C6H8O6)、FeSO4,FeSO4的浓度为0.2 mol/L,n(C6H8O6)/n(Fe2+)=0.5,反应温度为160 ℃,反应时间为3 h。结果表明:在最优条件下制备的LiFePO4颗粒呈现规则的球型结构,一致性较好,表面较为光滑; 以PI改性凝胶碳化材料作为电极,其比电容达到152.5 F/g,随着电流密度增加,比电容保持率为88.5%(从152.5 F/g变化到135 F/g),表现出较好的电化学稳定性。采用此电极材料构成的充放电装置,具有较小的内阻,且表现出较好的离子扩散效应。
Abstract:
The hydrothermal method was used to synthetize LiFePO4 nanoparticles with the raw materials of FeSO4, LiOH and NH4H2PO4, which mole ratio was n(Li+):n(Fe2+):n(PO3+4)of 3:1:1, and the composite material of LiFePO4 modified polyimide gel carbonized material was prepared by the pyrolysis of LiFePO4 and polyimide(PI)gel. The chemical structure of LiFePO4 and electrochemical properties of the composite material were characterized by Fourier transform infrared spectrum(FT-IR), X ray diffraction(XRD), scanning electron microscope(SEM), surface area analyzer and electrochemical workstation. The preparation of LiFePO4 particles in the best conditions were as follows: the addition order of LiOH, NH4H2PO4, ascorbic acid(C6H8O6), with n(C6H8O6)/n(Fe2+)=0.5, 2 mol/L FeSO4, reaction temperature of 160 ℃, and reaction time of 3 h.The morphology of LiFePO4 particle expressed regular spherical structure with good consistency and smooth surface under the optimal conditions. The LiFePO4 modified polyimide gel carbonized materials showed excellent electrochemical stability as the electrode with the specific capacitance of 152.5 F/g, and with the increase of the current density, the specific capacitance still maintained 88.5%(from 152.5 F/g to 135 F/g). The charge-discharge device formed by the above material had low resistance and better ion diffusion effect.

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备注/Memo

备注/Memo:
收稿日期:2018-12-18
作者简介:俞娟(1985—),女,E-mail:yu_juanjuan@126.com; 黄培(联系人),教授,E-mail:phuang@njtech.edu.cn.
引用本文:俞娟,杨帅,孔伟,等.LiFePO4改性聚酰亚胺凝胶碳化材料的制备及其电化学性能[J].南京工业大学学报(自然科学版),2019,41(4):403-410..
更新日期/Last Update: 2019-07-20