Optimization design of conductive agent based on ternary lithium-ion battery

doi:10.19799/j.cnki.2095-4239.2024.0998

Abstract

Abstract:

Conductive agents are crucial components of lithium-ion batteries, directly affecting internal resistance, rate capability, capacity, and cycle stability. To investigate the impact of different types and proportions of conductive agents on the electrochemical performance of ternary lithium-ion batteries, this study utilized three conductive agents (Super P, L-MWCNTs, and S-MWCNTs) with NCM622 as the cathode active material. Three types of button cells were prepared with a mass ratio of cathode active material to conductive agent to binder set at 8∶1∶1. Electrochemical tests, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge-discharge tests, were conducted to assess the effects of various conductive agents on the electrochemical performance of ternary lithium-ion batteries, with the aim of optimizing conductive agent selection. Based on the results, S-MWCNTs, which exhibited the best electrochemical performance, were further employed to explore the impact of varying conductive agent proportions on battery performance, thereby optimizing the balance between conductive agent content and electrode mass-specific capacity. The results indicated that batteries using S-MWCNTs demonstrated lower impedance, higher discharge specific capacity, and superior rate performance and cycle stability. Furthermore, cells with varying S-MWCNT proportions showed significant performance differences, particularly evident during high-rate charge-discharge cycles. This study highlights the importance of selecting and optimizing conductive agents to enhance battery performance, providing a reference for future optimization of conductive agent content in ternary lithium-ion batteries.

Key words: conductive agent, MWCNT, selection of conductive agent, lithium-ion battery, electrochemical performance

CLC Number:

TM 911

Shuaibo ZENG, Yongyi LI, Jing PENG, Zixing HE, Zhuojian LIANG, Wei XU, Lingxiao LAN, Xinghua LIANG. Optimization design of conductive agent based on ternary lithium-ion battery[J]. Energy Storage Science and Technology, 2025, 14(3): 1187-1197.

Figures/Tables 8

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References 13

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比容量/(mAh/g)	0.1C		0.2C		0.5C		1C		2C		3C
比容量/(mAh/g)	充电	放电	充电	放电	充电	放电	充电	放电	充电	放电	充电	放电
Super P	112	110.9	103.2	98.6	78.5	77	57.5	56.7	43.8	42.9	26.1	25.7
L-MWCNT	140.2	133.8	122.7	120.6	101.9	101	81	80.2	55.7	55	33.7	33.4
S-MWCNT	145.1	136.5	123.6	121.7	111.8	101.4	82.2	81.6	58.2	57.7	37.2	36.7

比容量/(mAh/g)	0.1C		0.2C		0.5C		1C		2C		3C
比容量/(mAh/g)	充电	放电	充电	放电	充电	放电	充电	放电	充电	放电	充电	放电
8.5∶0.5∶1	138.3	136.4	120.5	118.7	93.5	92.8	66	65.8	16.5	16.7	0.6	0.7
8.3∶0.7∶1	139	134	125	123.4	104.4	103.5	82.2	81.6	50.9	50.5	22.1	22.2
8∶1∶1	145.1	136.5	123.6	121.7	111.8	101.4	82.2	81.6	58.2	57.7	37.2	36.7

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