Degradation kinetics of ultra⁃high molecular⁃weight polyethylene for wet⁃process separator of lithium⁃ion battery

doi:10.19491/j.issn.1001-9278.2024.12.004

Abstract

Abstract:

The paper reported an investigation on the degradation kinetics of ultra⁃high molecular⁃weight polyethylene （PE⁃UHMW） used for wet⁃process separator of lithium⁃ion battery under different conditions such as temperature， synthetic oil concentration， and shear force. A degradation rate curve was fitted to obtain a kinetic model suitable for the degradation behavior of PE⁃UHMW. The degradation kinetics of PE⁃UHMW at various temperatures and white oil concentrations was consistent with the first⁃order kinetic model； however， its degradation kinetics under a shear stress conformed to the second⁃order kinetic model. The degradation rate of PE⁃UHMW increased with an increase in the temperature and shear force； however， its degradation rate was reduced by the addition of white oil.

Key words: lithium battery wet?process separator, ultra?high molecular weight polyethylene, degradation kinetics model

CLC Number:

TQ325.1⁺2

SONG Ruiming, LYU Huaixing, ZHANG Wenlong, LI Bin, LI Hui. Degradation kinetics of ultra⁃high molecular⁃weight polyethylene for wet⁃process separator of lithium⁃ion battery[J]. China Plastics, 2024, 38(12): 24-28.

Figures/Tables 12

Fig.1. Degradation rate curves of PE⁃UHMW at different temperatures

Fig.2. Fitting curves of quasi⁃first⁃order kinetic model of PE⁃UHMW degradation at different temperatures

Fig.3. Fitting curves of quasi⁃second⁃order kinetic model of PE⁃UHMW degradation at different temperatures

温度/℃	ln（C_∞-C_t ）-t线性回归方程	R²	C_∞	K₁
140	y=-0.010 01x+4.516 0	0.942 7	91.47	0.010 01
160	y=-0.081 65x+5.397 5	0.926 2	220.9	0.081 65
180	y=-0.083 24x+4.971 9	0.901 3	144.3	0.083 24

Tab.1. Quasi⁃first⁃order kinetic model parameters of PE⁃UHMW degradation rate curves at different heat treatment temperatures

Fig.4. Degradation rate curves of PE⁃UHMW at different white oil dosages

Fig.5. Fitting curves of quasi⁃first⁃order kinetic model of PE⁃UHMW at different white oil dosages

Fig.6. Quasi⁃second⁃order kinetic model fitting curves of PE⁃UHMW at different mineral oil dosages

矿物油

剂量/%

ln（C_∞-C_t）-t线性

回归方程

R²

K₁

Tab.2. Parameters of the quasi⁃first⁃order kinetic model of PE⁃UHMW degradation at different white oil dosages

Fig.7. Degradation rate curve of PE⁃UHMW under shear force

Fig.8. Fitting curve of quasi⁃first⁃order kinetic model of PE⁃UHMW under shear force

Fig.9. Fitting curve of quasi⁃second⁃order kinetic model of PE⁃UHMW under shear force

温度/℃	n/C_n ⁃n线性回归方程	R²	C_∞	K₂
140	y=0.019 34x+0.444 57	0.990 8	51.71	0.000 84
160	y=0.015 98x+0.265 44	0.999 4	62.58	0.000 96
180	y=0.016 31x+0.171 22	0.999 4	61.31	0.001 55

Tab.3. Parameters of the quasi⁃second⁃order kinetic model of PE⁃UHMW degradation under shear force

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