Influences of electrode structure on the electrical properties of （NMC+AC）/HC hybrid capacitor

doi:10.19799/j.cnki.2095-4239.2021.0702

Abstract

Abstract:

A hybrid capacitor is a novel form of energy storage device that combines the advantages of both a lithium secondary battery and a supercapacitor. It is widely used in the field of electrochemical energy storage. The electrode materials of hybrid capacitors include those electrode materials used in lithium-ion secondary batteries and supercapacitors, contributing to the "cross structure" formed in the hybrid capacitor. (NCM + AC) hybrid-positive and hard carbon-negative electrodes were prepared using dry and wet processes, respectively, and the 064060 flexible packing hybrid capacitors were assembled. The features of the two electrode architectures are extensively examined, as well as their effects on the performance of the flexible packing hybrid capacitor. The findings of the experiments demonstrate that the dry electrode has a lot of PTFE fiber structures and that the particles in the raw material are closer together. Under the same thickness, the dry electrode has higher loading active material, higher volume density, and smaller ohmic and polarization resistances than the wet electrode. In comparison with those of the wet electrode product, the capacity and energy density of the dry electrode product rise by >20% in the same volume of flexible packaging product. Under the condition of the same ratio of positive to negative electrode in areal density and in discharge capacity, the life of high-and low-temperature, cycle, rate charge-discharge, and high-temperature endurance tests of dry electrode products are better than those of wet electrode products. Dry electrode preparation is solventless, environmentally friendly, and cost-effective, and its PTFE fiber can securely connect NCM and AC, making it ideal for hybrid capacitor electrode preparation.

Key words: hybird capacitor, dry electrode, wet electrode, energy density, polarization resistance

CLC Number:

TM 911

Fengrong HE, Qiwen ZHANG, Dechao GUO, Yimin GUO, Xiaodong GUO. Influences of electrode structure on the electrical properties of （NMC+AC）/HC hybrid capacitor[J]. Energy Storage Science and Technology, 2022, 11(7): 2051-2058.

Figures/Tables 11

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材料型号	粒径/μm			振实密度/(g/cm³)	比表面积/(m²/g)	0.2C容量/(mAh/g)	效率/%
材料型号	D10	D50	D90	振实密度/(g/cm³)	比表面积/(m²/g)	0.2C容量/(mAh/g)	效率/%
YP-50F	1.91	5.42	10.32	0.41	1600	40	98
P450	5.74	9.80	16.1	2.59	0.28	164.5	>85.5
Type2	2.83	5.00	7.52	0.97	6.00	350	>83

电极名称	厚度/μm	面密度/(g/m²)	体积密度/(g/cm³)	方阻/(mΩ/sq)	剥离强度/(N/cm)
干法正极	145	245	1.96	1.2	1.32
干法负极	187	185	1.07	1.0	1.07
湿法正极	145	204	1.63	2.1	0.95
湿法负极	175	155	0.96	1.3	0.85

产品编号	单体容量/F	单体内阻/mΩ	存储能量/Wh	能量密度/(Wh/kg)	功率密度/(kW/kg)	质量/g
HSC-SF	1050	8.8	1.42	59.2	5.54	24
HSC-GF	1310	8.5	1.77	70.9	5.51	25

产品编号	温度/℃	单体容量/F	单体内阻/mΩ
HSC-SF	25	1050	8.8
	-25	895	21.7
	55	1072	8.3
HSC-GF	25	1310	8.5
	-25	1179	18.9
	55	1355	8.0

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