羧甲基壳聚糖水性粘结剂改性及其在磷酸铁锂正极的应用研究

李  勇; 仲皓想; 赵欣悦; 邵  丹; 张灵志

doi:10.3969/j.issn.2095-560X.2015.03.011

新能源进展 >

2015 , Vol. 3 >Issue 3: 226 - 230

DOI: https://doi.org/10.3969/j.issn.2095-560X.2015.03.011

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羧甲基壳聚糖水性粘结剂改性及其在磷酸铁锂正极的应用研究

李勇 ,
仲皓想 ,
赵欣悦 ,
邵丹 ,
张灵志

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1. 中国科学院广州能源研究所，广州 510640；
2. 中国科学院大学，北京 100049

李勇（1988-），男，硕士研究生，主要从事锂离子电池正极水系粘结剂的研究。

收稿日期: 2015-03-17

修回日期: 2015-03-31

网络出版日期: 2015-06-30

基金资助

广东省中国科学院全面战略合作专项（2013B091300017）；
广州市科技计划项目（2014Y2-00219）；
浙江省舟山市科技计划项目（2014C11021）；
浙江舟山群岛新区科技创业领军团队（201301）；
广东省特支计划科技创新领军人才项目（2014TX01N014）

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Modification of Carboxymethyl Chitosan as Water Soluble Binder for Lithium Iron Phosphate Cathode in Lithium-ion Batteries

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1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2015-03-17

Revised date: 2015-03-31

Online published: 2015-06-30

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摘要

羧甲基壳聚糖（C-CTS）作为磷酸铁锂（LiFePO4, LFP）正极水系粘结剂的两种改性方式分别是：（1）与聚环氧乙烷（PEG）共混制备C-CTS/PEG复合粘结剂；（2）在C-CTS/PEG混合体系中，以三羟甲基丙烷-三[3-(2-甲基吖丙啶基)丙酸酯]（XR-104）作为交联剂制备可交联的C-CTS/PEG/XR-104水系粘结剂。本文考察了不同C-CTS/PEG质量比复合粘结剂对LFP正极的电化学性能的影响，C-CTS/PEG的优化重量比为3∶1，此时LFP正极表现出最佳的循环稳定性。电池在0.5 C下充放电测试，140次循环后容量保持率为99%。采用差示扫描量热法（DSC）、傅里叶红外光谱仪（FTIR）和溶解实验等研究C-CTS/PEG与XR-104的交联反应，当交联剂XR-104的重量为C-CTS的1%时，LFP正极表现出最佳的电化学性能。

关键词： 羧甲基壳聚糖; 锂离子电池; 磷酸铁锂; 改性

本文引用格式

李勇 , 仲皓想 , 赵欣悦 , 邵丹 , 张灵志 . 羧甲基壳聚糖水性粘结剂改性及其在磷酸铁锂正极的应用研究[J]. 新能源进展, 2015 , 3(3) : 226 -230 . DOI: 10.3969/j.issn.2095-560X.2015.03.011

Abstract

Carboxymethyl chitosan (C-CTS) was modified in two different methods as water soluble binder for LiFePO4 (LFP) cathode: (1) blending C-CTS with polyethylene oxide (PEG) to prepare the composite binder (C-CTS/PEG), (2) using trimethylolpropane tris(2-methyl-1-aziridinepropionate) (XR-104) as a crosslinker in C-CTS/PEG blending system to prepare crosslinkable water soluble binder (C-CTS/PEG/XR-104). The electrochemical performances of LFP cathode with C-CTS/PEG composite binders of different weight ratios were investigated. LFP cathode exhibited the best cycle stability when using an optimized weight ratio of 3:1 for C-CTS/PEG binder, showing a capacity retention of 99% after 140 cycles at 0.5 C. Differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and dissolution experiments were employed to study the cross-linking reaction between C-CTS/PEG and XR-104. It was found that LFP cathode with optimal amount of 1% XR-104 crosslinker showed the best rate capability.

Key words： carboxymethyl chitosan; lithium ion battery; lithium iron phosphate; modification

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