Synthesis of Li3PO4-doped Li(Ni0.5Co0.2Mn0.3)O2 by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries

Zhang Rui; WU Yuanxin; HE Yunwei; AI Changchun

doi:10.11949/j.issn.0438-1157.20150562

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Synthesis of Li₃PO₄-doped Li(Ni_0.5Co_0.2Mn_0.3)O₂ by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries

更新时间：2025-12-10

- Synthesis of Li₃PO₄-doped Li(Ni_0.5Co_0.2Mn_0.3)O₂ by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries
- CIESC Journal Issue 8, Pages: 3177-3182(2015)
- 作者机构：
  
  1. 武汉工程大学化工与制药学院,湖北,武汉,430073
  2. 武汉工程大学化学与环境工程学院,湖北,武汉,430073
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150562
  CLC： M912.9
- Online First：05 August 2015，
  
  Published：05 August 2015
- 稿件说明：
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Zhang Rui, WU Yuanxin, HE Yunwei, et al. Synthesis of Li₃PO₄-doped Li(Ni_0.5Co_0.2Mn_0.3)O₂ by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries[J]. CIESC Journal, 2015, (8): 3177-3182. DOI: 10.11949/j.issn.0438-1157.20150562.
DOI：

Zhang Rui, WU Yuanxin, HE Yunwei, et al. Synthesis of Li₃PO₄-doped Li(Ni_0.5Co_0.2Mn_0.3)O₂ by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries[J]. CIESC Journal, 2015, (8): 3177-3182. DOI: 10.11949/j.issn.0438-1157.20150562. DOI：

摘要

采用氢氧化物共沉淀法制备了锂离子电池正极材料前驱体(Ni0.5Co0.2Mn0.3)(OH)2

并用流变相反应法合成了Li3PO4掺杂的Li(Ni0.5Co0.2Mn0.3)O2锂离子电池正极材料。运用X射线粉末衍射和恒电流充放电对产物进行了结构和电化学性能的表征

结果表明Li3PO4掺杂的Li(Ni0.5Co0.2Mn0.3)O2具有标准的层状α-NaFeO2结构

样品为1 μm左右的片状一次颗粒聚集而成的类球形二次颗粒。掺杂1%(质量分数)Li3PO4的Li(Ni0.5Co0.2Mn0.3)O2锂离子电池在0.1C的倍率下首次放电比容量达到188.6 mA·h·g-1(2.2～4.6 V vs Li+/Li)

30次循环后容量保持率为 92.9%。循环伏安、交流阻抗测试表明Li3PO4的掺杂可减少充放电过程中电解液和电极之间的电荷传递电阻和锂离子扩散电阻

减小极化作用

从而提升了Li(Ni0.5Co0.2Mn0.3)O2材料的电化学性能。

Abstract

LiNixCoyMnzO2 (0＜x＜1

0＜y＜1

0＜z＜1) has become prosperous materials for the next generation of rechargeable lithium ion battery due to the synergistic effect of the three elements and their higher discharge voltage platform and charge-discharge capacity

but the cycle stability still need to be improved. The Ni0.5Co0.2Mn0.3(OH)2 precursor was synthesized by using the method of hydroxide co-precipitation and the lithium phosphate doped Li(Ni0.5Co0.2Mn0.3)O2 powders prepared by rheological phase reaction. The crystal structure and electrochemical performance of Li3PO4 doped Li(Ni0.5Co0.2Mn0.3)O2 powders were measured by X-ray diffraction (XRD)

energy dispersive X-ray spectroscopy (EDS)

galvanostatic charge-discharge

cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The result indicated that Li(Ni0.5Co0.2Mn0.3)O2 doped with Li3PO4 powders maintained the laminated structure of α-type-NaFeO2

and the spherical powders were agglomerated with primary particles around 1 μm. The initial discharge capacity of Li(Ni0.5Co0.2Mn0.3)O2 powders doped with 1% (mass) Li3PO4 was 188.6 mA·h·g-1 (2.2—4.6 V vs Li+/Li)

and maintained 92.9% after 30 cycles at 0.1C. Moreover

CV results showed that oxidation and reduction potential of Li(Ni0.5Co0.2Mn0.3)O2 powders doped with 1% Li3PO4 were 3.98 and 3.64 V

the polarization of the sample was 0.34 V. The EIS tests showed that the charge transfer resistance and Warburg resistance of Li(Ni0.5Co0.2Mn0.3)O2 powders doped with 1% Li3PO4 were 36.7 and 0.08661 Ω. So that

Li3PO4 components can reduce the charge transfer resistance and Li+ diffusion resistance between electrode and electrolyte

and decrease the effect of polarization

thus promote the electrochemical performance of Li(Ni0.5Co0.2Mn0.3)O2.

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