Effect of binary composite conductive agent on the performance of lithium slurry battery

doi:10.19799/j.cnki.2095-4239.2023.0505

Abstract

Abstract:

Electronic conduction is a key factor limiting the performance of lithium (Li) slurry batteries with suspensions as electrodes. In this study, new conductive agents, including carbon nanotubes (CNTs) and graphene (Gen), were mixed with conventional conductive agents, incorporating Ketjen black and Cabot carbon black (Cabot), in different proportions to form a novel binary conductive agent. The effects of the binary conductive agents on the performance of Li slurry batteries were investigated using methods, such as scanning electron microscopy, slurry sedimentation rate, electrical conductivity, electrochemical impedance spectroscopy, and electrochemical performance tests. The results show CNTs wrapped around the surface of active particles, forming numerous conductive sites, while carbon black surrounded the active particles and CNTs to create a conductive path with wider coverage. Furthermore, carbon black adhered to the surface of Gen, enhancing its vertical conductivity. Nonetheless, Gen exhibited agglomeration and uneven dispersion. The slurry containing Gen possesses a low initial sedimentation rate but displays good liquid absorption and retention capabilities, maintaining a stable sedimentation rate of 3.10% over a long term. The slurry with the conductive composite of 1%Cabot+0.3%CNTs presents a high electrical conductivity of 124.75 mS/cm, and the half-cell's electrochemical transfer impedance is calculated as 42 Ω. In addition, the composite presents a discharge specific capacity of 171.06 mAh/g, an initial charge-discharge efficiency as high as 86.01%, and a capacity retention of 92.78% after 230 cycles.

Key words: binary, composite conductive agent, lithium slurry battery, electrical properties

CLC Number:

TM 911

Guihong GAO, Fuyuan LIU, Shenshen LI, Xiangkun WU, Yanxia LIU. Effect of binary composite conductive agent on the performance of lithium slurry battery[J]. Energy Storage Science and Technology, 2023, 12(11): 3299-3306.

Figures/Tables 9

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No.	NCM622/%	KB/%	CNTs/%	Cabot /%	Gen/%	分散剂/%
1#	50	1	0.3	—	—	48.7
2#		—	0.3	1	—	48.7
3#		1	—	—	0.5	48.5
4#		—	—	1	0.5	48.5

电池编号	充电比容量/(mAh/g)	放电比容量/(mAh/g)	首次充放电效率/%
1#	200.01	172.09	86.04
2#	198.89	171.06	86.01
3#	177.98	149.43	83.96
4#	197.35	166.34	84.29

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