LiFePO4 synthesized by hydrothermal method from Li3PO4 and its modification

ZHANG Weixin; ZHAO Fei; WANG Qiang; YANG Zeheng

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LiFePO₄synthesized by hydrothermal method from Li₃PO₄and its modification

更新时间：2025-12-10

- LiFePO₄synthesized by hydrothermal method from Li₃PO₄and its modification
- CIESC Journal Issue 10, Pages: 2719-2725(2010)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
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- Online First：05 October 2010，
  
  Published：05 October 2010
- 稿件说明：
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ZHANG Weixin, ZHAO Fei, WANG Qiang, et al. LiFePO₄synthesized by hydrothermal method from Li₃PO₄and its modification[J]. CIESC Journal, 2010, (10): 2719-2725.
DOI：

ZHANG Weixin, ZHAO Fei, WANG Qiang, et al. LiFePO₄synthesized by hydrothermal method from Li₃PO₄and its modification[J]. CIESC Journal, 2010, (10): 2719-2725. DOI：

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。

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 108.7mAh·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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