| 黄勇平,陈征,闫东伟,武英,况春江,周少雄,陈英,韩伟.化学通报,2014,77(6):527-534. |
| 不同包碳方式对LiFePO4/C微观结构及电化学性能的影响 |
| Effect of different carbon-coating ways on the microstructure and electrochemical performance of LiFePO4/C cathodes |
| 投稿时间：2014-01-09 修订日期：2014-02-26 |
| DOI： |
| 中文关键词: LiFePO4/C 原位包碳 石墨化程度 电化学性能 锂离子电池 |
| 英文关键词:LiFePO4/C In-situ carbon coating Graphitization degree Electrochemical performance Lithium ion batteries. |
| 基金项目:国家高技术研究发展计划（863计划） |
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| 中文摘要: |
| 综合利用C-S测试、XRD、SEM、BET、Raman、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Raman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。 |
| 英文摘要: |
| Comparative study on LiFePO4/C preparation process of adding carbon source in precursor and pre-sintered, marked as LFP-1(in-situ carbon coating) and LFP-2, respectively. The effects of carbon content, morphology, particle size and surface carbon structure on the electrochemical performance of LiFePO4/C cathodes were studied by means of C-S test, XRD, SEM, BET, Raman. SEM images show that particle size of the LFP-1 and LFP-2 are about 10μm and 100nm respectively. The EIS and galvnostatic charge-discharge tests indicate that the LFP-1 has lower charge transfer resistance Rct, better rate and cycle performance than that of LFP-2, which can be contributed to the different microstructure and the higher degree of graphitized carbon of LiFePO4/C. Raman spectroscopic analysis shows that the ratio of the ID/IG and Asp3/Asp2 of LFP-1 is lower that of LFP-2, which results in the higher degree of graphitized carbon of LFP-1. This result has important significance to improve the overall performance of olivine cathode materials for lithium ion batteries. |
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