涂炭铝箔对高能量密度LiFePO4 动力电池的影响

doi:10.19799/j.cnki.2095-4239.2022.0397

摘要/Abstract

摘要：

探究不同涂炭层的涂炭铝箔对高能量密度磷酸铁锂(LiFePO₄)动力电池的影响，以石墨+炭黑(GC)和炭黑(C)两种涂炭体系的涂炭铝箔制作的磷酸铁锂软包电池作为研究对象，评估了两种不同涂炭层对锂离子电池电化学性能的影响。物性对比结果显示，GC方案外观为深灰色，石墨与炭黑复合后具有大孔径的蓬松状结构，而C方案外观为黑色，由纳米级炭黑颗粒组成，呈现小孔径疏松状结构。结果显示GC复合涂炭层的黏结力为炭黑涂层的1.18倍。电化学性能结果表明，两种方案的首次库仑效率和放电平台一致性高，而GC方案的电荷转移阻抗更小。GC方案复合涂炭层更有利于提高电池的常温和高温循环性能，而C方案炭黑涂炭层可改善电池的大倍率和低温性能。

关键词: 锂离子电池, 磷酸铁锂, 涂炭铝箔

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

中图分类号:

TM 912.9

张凯博, 贾凯丽, 徐晓明, 曾涛, 薛有宝, 万柳, 赵宗良. 涂炭铝箔对高能量密度LiFePO₄ 动力电池的影响[J]. 储能科学与技术, 2022, 11(12): 3741-3747.

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.

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参考文献 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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涂炭铝箔对高能量密度LiFePO₄ 动力电池的影响

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

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