Influences of electrode structure on the electrical performances of lithium-ion capacitor

doi:10.19799/j.cnki.2095-4239.2021.0168

Abstract

Abstract:

Activated carbon cathode and graphite anode were prepared using dry and wet processes, respectively. The 066090-type flexible packing lithium-ion capacitor (LIC) monomer was made, which the anode was pre-lithiation by charging and discharging at constant current with a theoretical lithiation depth of 85%. Scanning electron microscopy, peeling strength, and electrical performance tests were used to investigate the effects of the dry and wet coating processes on the electrode structure and morphology, bonding performance, and electrical performances. The effects of electrode structure on flexible packing LIC capacity, internal resistance, endurance, cycling, and low-temperature performance were described. The results reveal that sufficient fibrous structures of the binder are observed in the dry electrode, and the carbon particles have close contact. The bulk density of the dry electrode increase by more than 8% compared with that of the wet coating electrode, and its peel strength is more than 50% higher than that of the wet coating electrode. When the areal density ratio of activated carbon cathode to graphite anode is 1, the initial capacity and internal resistance of the flexible packing LIC are 645 F and 25.5 mΩ at the potential range 2.2—3.8 V, respectively, both of which are higher than those of the wet coating electrode. The capacity of the flexible packing LIC assembled with dry electrode maintains above 97% after 1000 h endurance test, maintaining 88% after 100,000 cycles, and maintaining 76% at -30 ℃, which are superior to those of the products assembled with wet coating electrode. This research will help promote the use of dry electrodes in LIC products and serve as an experimental foundation for the research and development of high-performance LICs.

Key words: lithium-ion capacitor, perforated foil, pre-lithiation, dry electrode

CLC Number:

TM 911

Yimin GUO, Dechao GUO, Qiwen ZHANG, Chao LONG, Fengrong HE. Influences of electrode structure on the electrical performances of lithium-ion capacitor[J]. Energy Storage Science and Technology, 2021, 10(6): 2106-2111.

Figures/Tables 6

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Table 1

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Table 3

References 16

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集流体	电极名称	厚度/μm	面密度/(g/m²)	体积密度/(g/cm³)	剥离强度/(N/cm)
涂炭铝箔	干法正极	220	130.3	0.672	0.75
涂炭铜箔	干法负极	100	129.8	1.475	0.88
涂炭铝箔	湿法涂布正极	220	119.9	0.618	0.49
涂炭铜箔	湿法涂布负极	100	119.7	1.360	0.59

电极类型	正极面密度/(g/m²)	负极面密度/(g/m²)	正极面密度/负极面密度	初始容量/F	内阻/mΩ
干法电极	130.3	129.8	1.00	645	25.5
湿法涂布电极	119.9	119.7	1.00	592	24.5

电极类型	温度/℃	容量/F	内阻/mΩ
干法电极	25	645	25.5
干法电极	-30	490	221.8
湿法电极	25	592	24.5
湿法电极	-30	423	252.3

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