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不同包碳方式对LiFePO4/C微观结构及电化学性能的影响 被引量：1

Effect of Different Carbon-coating Ways on the Microstructure and Electrochemical Performance of LiFePO_4/C Cathodes
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摘要 综合利用碳-硫测试、XRD、SEM、BET、拉曼光谱、EIS及扣式电池测试等分析技术手段,对LiFePO4/C制备过程中原位包碳与非原位包碳(分别记为LFP-1、LFP-2)的研究结果表明,在碳含量、相结构一致的前提下,LFP-1为10μm左右带孔的大颗粒,LFP-2为由100nm左右小颗粒组成的类球状颗粒,前者的电荷转移电阻(Rct)、倍率性能、循环性能优于后者,这归结于不同的包碳方式导致的LiFePO4/C微观结构的不同,从而使拉曼光谱结果中LFP-1的ID/IG和Asp3/Asp2低于LFP-2,即前者石墨化程度高于后者。从而表明,碳的包裹情况对改善LiFePO4/C的电化学性能有重要的影响。该结果对提高橄榄石类锂离子电池正极材料的综合性能有重要意义。 Through comparative studying on LiFePO4/C preparation process of adding carbon source in precursor and pre-sintered material, marked as LFP-1 （in-situ carbon coating） and LFP-2 respectively, by means of C-S test, XRD, SEM, BET, Raman, the effects of carbon content, morphology, particle size and surface carbon structure on the electrochemical performance of LiFePO4/C cathodes were investigated. SEM images showed that particle sizes of LFP-I and LFP-2 are about 10μm and 100nm respectively. The EIS and galvnostatic charge- discharge tests indicated that LFP-1 has lower charge transfer resistance （R,） , better rate and cycle performance than that of LFP-2, which can be attributed to the different microstructure and the higher degree of graphitized carbon of LiFePQ/C. Raman spectroscopic analysis showed that the ratio of the I D/IG; and A ,3/A,2 of LFP-1 is lower that of LFP-2, which means the degree of graphitized carbon of LFP-1 is higher than that of LEP-2. These results have important significance for improving the overall performance of olivine cathode materials for lithium ion batteries.
作者 黄勇平 陈征 闫东伟 吴建民 武英 况春江 周少雄 陈英 韩伟
机构地区 钢铁研究总院 安泰科技股份有限公司研发中心 北京宏福源科技有限公司研发中心 迪肯大学功能纳米材料研究与创新研究所
出处 《化学通报》 CAS CSCD 北大核心 2014年第6期527-533,共7页 Chemistry
基金 国家高技术研究发展计划(863计划)项目(2013AA032002) 安泰科技股份有限公司技创项目(2011JA02GYF和2013JA02PYF)资助
关键词 原位包碳 石墨化程度 电化学性能 锂离子电池 LiFePO4/C, In-situ carbon coating, Graphitization degree, Electrochemical performance, Lithiumion batteries
分类号 TM912 [电气工程—电力电子与电力传动]
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参考文献32

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化学通报
2014年 第6期

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