Citation: ZHU Lei, JIA Di, CHEN Jun-Chao, JIANG Xiao-Biao, WU Yong-Min, PENG Lu-Ming, TANG Wei-Ping. Synthesis and Properties of LiFePO₄/LiNi_0.8Co_0.15Al_0.05O₂ Composite Cathode Material Modificated by Graphene for Lithium Ion Battery[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(8): 1501-1510. doi: 10.11862/CJIC.2018.190 shu

Synthesis and Properties of LiFePO₄/LiNi_0.8Co_0.15Al_0.05O₂ Composite Cathode Material Modificated by Graphene for Lithium Ion Battery

1.
State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources(SISP), Shanghai 200245, China
2.
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China

Corresponding author: PENG Lu-Ming, tangwp@sina.cn TANG Wei-Ping, luming@nju.edu.cn
Received Date: 19 April 2018
Revised Date: 19 May 2018

Figures(9)

The LiFePO₄-Graphene/LiNi_0.8Co_0.15Al_0.05O₂ composite for lithium ion batteries has been prepared by a two-step dry-mixing and ball-milling procedure to achieve high capacity and high security of LiNi_0.8Co_0.15Al_0.05O₂. The crystalline structure, morphology and electrochemical performance were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectronic spectroscopy (XPS) and electrochemical tests. With the addition of graphene, the LiFePO₄ nanoparticles can cover the surface of LiNi_0.8Co_0.15Al_0.05O₂ tightly, further protecting LiNi_0.8Co_0.15Al_0.05O₂ from the side reaction with electrolyte, increasing the utilization of active materials and enhancing the cycling performance. The conductive networks consisted of LiNi_0.8Co_0.15Al_0.05O₂, LiFePO₄ and graphene can facilitate electron infiltration and transport, thus improving the rate performance. The LiFePO₄-Graphene/LiNi_0.8Co_0.15Al_0.05O₂ composite with 20% (w/w) LiFePO₄ content exhibits a reversible capacitance up to 202.5 mAh·g^-1 at 0.1C, good rate capability with 160.5 mAh·g^-1 at 3C, and an excellent long-term cycling stability with 91.9% capacity retention after 100 cycles at 50℃, which is much better than 72.9% of the pristine LiNi_0.8Co_0.15Al_0.05O₂ and 82.0% of the LiFePO₄/LiNi_0.8Co_0.15Al_0.05O₂ composite.
- lithium ion battery,
- LiNi_0.8Co_0.15Al_0.05O₂,
- LiFePO₄,
- graphene
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Properties of LiFePO4/LiNi0.8Co0.15Al0.05O2 Composite Cathode Material Modificated by Graphene for Lithium Ion Battery

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Properties of LiFePO₄/LiNi_0.8Co_0.15Al_0.05O₂ Composite Cathode Material Modificated by Graphene for Lithium Ion Battery