| 基于Li_3PO_4水热法制备LiFePO_4及其改性 |
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| 引用本文： | 张卫新,赵飞,王强,杨则恒.基于Li_3PO_4水热法制备LiFePO_4及其改性[J].化工学报,2010,61(10):2719-2725. |
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| 作者姓名： | 张卫新 赵飞 王强 杨则恒 |
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| 作者单位： | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室 |
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| 基金项目： | 国家自然科学基金，安徽省教育厅创新团队计划项目 |
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| 摘 要： | 以自制Li3PO4为前驱体,在水热条件下与FeSO4.7H2O反应制备得到纯相LiFePO4,并通过碳包覆和Cu2+掺杂对其进行了有效改性,获得了适合高电流密度放电的LiFePO4正极材料。采用X射线衍射(XRD)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)对产物进行了物相和形貌表征。实验研究了水热反应温度对产物的形貌及其电化学性能的影响,同时探讨了掺杂Cu2+对材料常温和低温电化学性能的影响。结果表明:在200℃、24h水热条件下制得的产物,经碳包覆后的复合材料LiFePO4/C(LFP200/C),以1C(150mA.g-1)电流放电,放电比容量达140.7mAh.g-1;对材料进行Cu2+掺杂得到的Cu-LFP200/C材料的放电比容量及倍率性能得到进一步提高,常温下1C倍率的放电比容量为150.3mAh.g-1,10C倍率的放电比容量为108.7mAh.g-1,在-30℃条件下的放电比容量依然达到97mAh.g-1。
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| 关 键 词： | Li3PO4 水热法 LiFePO4 改性 |
LiFePO4 synthesized by hydrothermal method from Li3PO4 and its modification |
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| ZHANG Weixin,ZHAO Fei,WANG Qiang,YANG Zeheng.LiFePO4 synthesized by hydrothermal method from Li3PO4 and its modification[J].Journal of Chemical Industry and Engineering(China),2010,61(10):2719-2725. |
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| Authors: | ZHANG Weixin ZHAO Fei WANG Qiang YANG Zeheng |
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| Abstract: | LiFePO4, as cathode material of lithium ion batteries, which was suitable for discharge at high current density, was prepared by carbon-coating and Cu2+-doping modification of pure LiFePO4 synthesized from self-prepared Li3PO4 and FeSO4&;#8226;7H2O at hydrothermal condition.The effects of hydrothermal temperature on electrochemical property and its phase composition, structure and morphology, characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM)and scanning electron microscopy (SEM), were studied.The electrochemical performance of Cu 2+ -doped samples at room and low temperature was also investigated.The results show that the carbon-coating composite LiFePO4/C (LFP/C)synthesized hydrothermally at 200℃ for 24 h is of specific capacity of 140.7 mAh·g-1 under discharge current density of 1C (150 mA·g-1）. The performance could be further improved after LFP200/C was doped by Cu 2+ , i.e.the specific capacity was 150.3mAh·g-1 and 108.7mAh·g-1 at room temperature with discharge current density 1 C and 10 C, and 97 mAh·g-1 at -30℃, respectively. |
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| Keywords: | Li3PO4 LiFePO4 |
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