CIESC Journal ›› 2010, Vol. 61 ›› Issue (10): 2719-2725.
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ZHANG Weixin; ZHAO Fei; WANG Qiang; YANG Zeheng
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张卫新;赵飞;王强;杨则恒
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 FeSO48226;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.
Key words: Li3PO4;水热法;LiFePO4, 改性
Li3PO4;水热法;LiFePO4,
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℃、24 h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1 C(150 mA.g-1)电流放电,放电比容量达140.7 mAh·g-1;对材料进行Cu 2+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1 C倍率的放电比容量为150.3 mAh·g-1,10 C倍率的放电比容量为108.7 mAh·g-1, 在-30℃条件下的放电比容量依然达到97 mAh·g-1。
关键词: Li3PO4;水热法;LiFePO4, 改性
ZHANG Weixin, ZHAO Fei, WANG Qiang, YANG Zeheng. LiFePO4 synthesized by hydrothermal method from Li3PO4 and its modification[J]. CIESC Journal, 2010, 61(10): 2719-2725.
张卫新, 赵飞, 王强, 杨则恒. 基于Li3PO4水热法制备LiFePO4及其改性 [J]. 化工学报, 2010, 61(10): 2719-2725.
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