水热法制备树叶状LiFePO<sub>4</sub>/C复合正极材料

引用本文: 云强, 周园, 海春喜, 申月, 李翔, 张丽娟, 李松, 丁秀萍. 水热法制备树叶状LiFePO₄/C复合正极材料[J]. 无机化学学报, 2015, (5): 880-887. doi: 10.11862/CJIC.2015.128 shu

Citation: YUN Qiang, ZHOU Yuan, HAI Chun-Xi, SHEN Yue, LI Xiang, ZHANG Li-Juan, LI Song, DING Xiu-Ping. Hydrothermal Synthesis of Leaf-like LiFePO₄/C Cathode Composites[J]. Chinese Journal of Inorganic Chemistry, 2015, (5): 880-887. doi: 10.11862/CJIC.2015.128 shu

水热法制备树叶状LiFePO₄/C复合正极材料

云强 ^1,2, ,
周园 ^{1,
,} ,
海春喜 ^1, ,
申月 ^1, ,
李翔 ^1,2, ,
张丽娟 ^1,2, ,
李松 ^1,2, ,
丁秀萍 ^1,

1.
1 中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;
2.
2 中国科学院大学, 北京 100049

通讯作者: 周园 zhouy@isl.ac.cn

基金项目:
国家高技术研究发展计划(863)(No.2013AA110100) (863)(No.2013AA110100)

国家重点基础研究发展计划(973)(No.2014CB660806) (973)(No.2014CB660806)

中国科学院“西部之光”人才培养计划(No.Y412041007) (No.Y412041007)

2014年西宁市科技项目(No.2014-6-24)资助。 (No.2014-6-24)

摘要: 采用柠檬酸辅助水热法合成了高分散性树叶状LiFePO₄/C复合正极材料。利用X射线衍射、傅里叶红外光谱、扫描电镜、高分辨率透射电镜和选区电子衍射分析了材料的形貌结构。结果表明,柠檬酸对树叶状LiFePO₄/C复合材料的形成具有促进作用。该材料的最大暴露晶面为(010)晶面,且分散性较好。与颗粒状LiFePO₄/C材料相比,该材料呈现出更高的放电比容量和更好的倍率性能,在0.1C和5C倍率下,放电比容量分别为158和126mAh·g^-1,其原因是由于锂离子沿[010]方向的扩散距离缩短,从而使锂离子扩散系数显著增大。

关键词:

材料科学;水热合成;电化学;LiFePO₄/C;树叶状;柠檬酸

English

Hydrothermal Synthesis of Leaf-like LiFePO₄/C Cathode Composites

1.
1 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
2.
2 University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: 周园 zhouy@isl.ac.cn

Received Date: 27 January 2015
Fund Project:
国家高技术研究发展计划(863)(No.2013AA110100)

国家重点基础研究发展计划(973)(No.2014CB660806)

中国科学院“西部之光”人才培养计划(No.Y412041007)

2014年西宁市科技项目(No.2014-6-24)资助。

Abstract: Highly-dispersed LiFePO₄/C composite with micro-leaf structure was synthesized by a facile citric acid-assisted hydrothermal method in this study. Crystal structure and morphology of samples were investigated by XRD, FTIR, SEM, HR-TEM and selected area electron diffraction (SAED). The characterization results indicate that citric acid accelerates the formation of leaf-like LiFePO₄/C composite. The as-prepared leaf-like LiFePO₄/C composite with an enlarged (010) plane has high dispersibility. By comparing the electrochemical properties of the LiFePO₄/C particles in our study, the LiFePO₄/C micro-leaves exhibit larger discharge capacity and better rate performance, which deliver a discharge capacity of 158 mAh·g^-1 at 0.1C and 126 mAh·g^-1 at 5C. The enhanced performance perhaps is attributed to the reduced Li-ion diffusion paths along the [010] direction and larger Li-ion diffusion coefficient.

Key words:

materials science;hydrothermal synthesis;electrochemistry;LiFePO₄/C;micro-leaf;citric acid

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沈阳化工大学材料科学与工程学院沈阳 110142

水热法制备树叶状LiFePO₄/C复合正极材料

通讯作者: 周园 zhouy@isl.ac.cn

English

Hydrothermal Synthesis of Leaf-like LiFePO₄/C Cathode Composites

Corresponding author: 周园 zhouy@isl.ac.cn

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中国化学会秘书处

水热法制备树叶状LiFePO4/C复合正极材料

通讯作者: 周园 zhouy@isl.ac.cn

English

Hydrothermal Synthesis of Leaf-like LiFePO4/C Cathode Composites

Corresponding author: 周园 zhouy@isl.ac.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

水热法制备树叶状LiFePO₄/C复合正极材料

Hydrothermal Synthesis of Leaf-like LiFePO₄/C Cathode Composites

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs