首页|Clarification of the dispersion mechanism of cathode slurry of lithium-ion battery under effects of both poly vinylidene fluoride/carbon black ratio and mixing time

Clarification of the dispersion mechanism of cathode slurry of lithium-ion battery under effects of both poly vinylidene fluoride/carbon black ratio and mixing time

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This paper presents the effects of both poly vinylidene fluoride(PVDF)/carbon black(CB)ratio(mPVDF∶mCB)and mixing time t on the dispersion mechanism of the cathode slurry of lithium-ion battery(LIB).The dispersion mechanism is deduced from the electrochemical,morphological and theological properties of the cathode slurry by using electrical impedance spectroscopy(EIS),scanning electron microscopy and rheology methods,respectively.From the perspective of EIS method,static simulation models are established in the COMSOL Multiphysics software;meanwhile,the simulated results are used to verify the correctness of the electrochemical properties of the cathode slurry.As a result,the following conclusions are able to be obtained.Firstly,in the case of the mass ratio mPVDF∶mCB=5∶10,LiCoO2 particles are completely coated by the mixture of CB and PVDF to form a stable polymer gel structure.Higher or lower mPVDF∶mCB leads to the larger impedance and worse dispersion status for the cathode slurry.Secondly,when t=6 min,a good gel-like conductive network structure is formed by coating the thinner evenly dispersed CB-PVDF double layer around LiCoO2 particles.Finally,a strategy regarding to both mPVDF∶mCB and t in experimental scale is proposed,which has the capability of improving the performance of LIB.

Cathode slurryDispersion mechanismLithium-ion battery(LIB)

Zhilong Wang、Zhenzhen Zhao、Ye Yang、An Zhang、Xiayi Liu、Tong Zhao、Yahui Cui

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School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048,China

国家自然科学基金国家自然科学基金陕西省重点研发计划Ministry of Education's"Chunhui Plan"Collaborative Research projectScience and Technology Program of Xi'an

52006176621014382022kw-1820220049122GXFW0095

2024

10.1016/j.partic.2023.08.020

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.88(5)
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