Effect of carbon-coated aluminum foil on high energy density LiFePO4 power battery

doi:10.19799/j.cnki.2095-4239.2022.0397

Abstract

Abstract:

This studies the influence of different carbon-coated aluminum foils on high-energy-density LiFePO₄ power batteries. The effect of graphite + Carbon black (GC) and Carbon black (C) as current collectors on the electrochemical performance in lithium iron phosphate soft pack batteries. The physical property comparison shows that the appearance of the GC scheme is dark grey, alternately undulating after being compounded by graphite and Carbon black, and has a fluffy structure with large pore size. On the other hand, the appearance of the C scheme is black, composed of nanoscale C particles, showing a loose structure with a small pore size. The results show that the bonding strength of GC composite coating is 1.18 times that of C coating. Electrochemical performance results show that the two schemes' first coulombic efficiency and discharge platform are consistent.In contrast, the charge transfer impedance of the GC scheme is negligible. The GC scheme improves the cycle performance at room and high temperatures while the C coating in plan C is improved in large magnification and low-temperature performance. The advantage of the composite carbon-coated layer may depend on the structural design advantage, improving the electron transport ability and thermal conductivity in the plane direction.

Key words: Li-ion battery, LiFePO₄, carbon-coated aluminum foil

CLC Number:

TM 912.9

Kaibo ZHANG, Kaili JIA, Xiaoming XU, Tao ZENG, Youbao XUE, Liu WAN, Zongliang ZHAO. Effect of carbon-coated aluminum foil on high energy density LiFePO₄ power battery[J]. Energy Storage Science and Technology, 2022, 11(12): 3741-3747.

Figures/Tables 11

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References 21

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方案	厚度/μm	铝箔面密度/(g/m²)	涂层面密度/(g/m²)	抗拉强度/(N/mm²)	延展率/%
GC	13+2	35.1	0.8	203.42	3.45
C	13+2	35.1	0.8	215.77	3.57

方案	外观颜色	涂炭层体系	片径或粒径/μm	正极片碾压后剥离力/N
GC	深灰色	石墨+炭黑	12～20 (石墨)	6.63
C	黑色	炭黑	20～80 (炭黑)	5.61

方案	放电容量/Ah	首次效率/%	容量/mAh	电压平台/V	内阻/mΩ
GC	2.16	93.16	148.5	3.249	7.63
C	2.15	93.22	147.8	3.248	7.58

方案	R_s/mΩ	R_SEI/mΩ	R_ct/mΩ
GC	5.76	23.32	47.35
C	5.82	24.96	56.45

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Effect of carbon-coated aluminum foil on high energy density LiFePO₄ power battery

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