Study on the influence of particle composition on the performance of lithium slurry batteries

doi:10.19799/j.cnki.2095-4239.2022.0537

Abstract

Abstract:

Based on the filling effect between large and small particles, we designed seven grading systems using two sizes of active particles and studied the performance of the slurry systematically. The particle size distribution, surface area, particle morphology, electrical conductivity, sedimentation rate, electrochemical impedance spectrum, and charging and discharging properties of the slurry were analyzed using a laser particle size analyzer, conductivity meter, specific surface area measuring instrument, scanning electron microscope (SEM), sedimentation test, and electrochemical test. The results indicate that the particle distribution is a single peak close to the normal distribution. The particles have either macroporous or nonporous structures. The small particles are typical single-crystal structures, and the large particles comprise spherical particles with relatively larger diameters. The SEM images of 3∶7 and 0∶10 samples show that a large particle is surrounded by small particles and a conductive agent, forming a complete continuous three-dimensional conductive network. The conductivity of slurry formed by large particles is 41.80 mS/cm, and that of slurry formed by small particles can be as high as 123.39 mS/cm. The 3∶7 sample's sedimentation and settling rates are the smallest, and the particle distribution is closer to Fuller's grading curve of densely packed particles. The 0.1 C specific discharge capacity of the 3∶7 and 5∶5 samples reached 194.88 and 187.38 mAh/g, respectively, with actual specific capacities 10% and 5% higher than the commercial typical values, and the first cycle charging-discharging efficiencies were as high as 90.54% and 87.96%, respectively. Moreover, the best cycling performance of 83.63% capacity retention after 250 cycles was provided by the 3∶7 sample. In summary, the 3∶7 sample showed the most effective filling effect and best electrochemical performance. In this study, we could realize the best particle ratio grading system, providing an essential reference for particle gradation systems with excellent performance.

Key words: grain composition, lithium slurry, battery, fuller's grading curve

CLC Number:

TM 911

Guihong GAO, Shenshen LI, Fuyuan LIU, Xiangkun WU, Yanxia LIU. Study on the influence of particle composition on the performance of lithium slurry batteries[J]. Energy Storage Science and Technology, 2023, 12(2): 329-338.

Figures/Tables 12

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序号	样品组成(大粒径∶小粒径)	大粒径622/%	小粒径622/%	KB/%	CNT/%	分散剂/%
1	10∶0 9∶1 7∶3 5∶5 3∶7 1∶9 0∶10	50	0	1	0.3	48.7
2		45	5
3		35	15
4		25	25
5		15	35
6		5	45
7		0	50

项目	电极浆料
项目	10∶0	9∶1	7∶3	5∶5	3∶7	1∶9	0∶10
测试点1	41.41	45.43	62.7	65.96	76.62	1∶9	123.2
测试点2	41.43	45.33	62.67	66.72	76.62	63.08	123.3
测试点3	41.56	45.31	62.75	67.15	76.61	63.12	123.3
测试点4	41.67	45.48	62.78	67.8	76.62	63.16	123.3
测试点5	41.75	45.41	62.73	68.33	76.82	63.33	123.3
测试点6	41.86	45.4	62.73	68.36	76.81	63.45	123.4
测试点7	41.87	45.33	62.75	68.58	76.8	63.49	123.4
测试点8	41.94	45.35	62.76	69.04	77.01	63.71	123.5
测试点9	42.03	45.28	62.79	69.49	77.02	63.81	123.5
标准差	0.222	0.093	0.036	1.188	0.172	63.85	0.104

参数	10∶0	9∶1	7∶3	5∶5	3∶7	1∶9	0∶10
D10/μm	6.23	5.16	4.32	3.46	3.27	3.12	3.21
D50/μm	10.0	9.41	7.55	7.01	6.38	5.45	5.28
D90/μm	15.7	15.6	13.71	13.10	11.20	9.16	8.37
比表面积/(m²/kg)	641.2	735.3	872.6	1003	1083	1213	1226

大粒径∶小粒径质量比	R_s/Ω	R_ct/Ω
10∶0	1.49	99.09
9∶1	4.87	55.44
7∶3	1.38	54.96
5∶5	0.88	51.07
3∶7	1.93	51.91
1∶9	7.11	67.09
0∶10	0.54	75.38

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