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Full-ceramic diaphragm for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and ceramic diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of easy shrinkage, decomposition, and thermal stability of diaphragms at high temperatures, and achieve the elimination of safety issues and good electrolyte Wettability, effect of increasing porosity

Active Publication Date: 2020-07-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymeric binder in the ceramic coating also has the defects of easy shrinkage and decomposition at high temperature, which becomes an unfavorable factor affecting the thermal stability of the separator

Method used

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  • Full-ceramic diaphragm for lithium ion battery and preparation method thereof
  • Full-ceramic diaphragm for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP) are mixed uniformly at a certain mass ratio of 40:55:0.2:0.8:4, molded, and dried at 75°C; The dried molded sample was placed in a muffle furnace and calcined to 810° C., the heating rate was 6° C. / min, and the temperature was maintained for 10 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium-ion batteries.

[0014] The all-ceramic diaphragm for lithium-ion batteries has a porosity of 56.3%, a liquid absorption rate of 193%, and a discharge specific capacity of 91.8mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 2

[0016] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP) are mixed uniformly at a certain mass ratio of 50:45:0.4:0.6:4, molded, and dried at 75°C; The dried molded sample was placed in a muffle furnace and calcined to 830° C., the heating rate was 5° C. / min, and the temperature was maintained for 9 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium-ion batteries.

[0017] The all-ceramic separator for lithium-ion batteries has a porosity of 57.9%, a liquid absorption rate of 202%, and a discharge specific capacity of 92.1mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 3

[0019] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), N,N-dimethylformamide (DMF) are mixed uniformly at a certain mass ratio of 55:40:0.5:0.5:4, molded, 75°C Drying; the dried molded sample was placed in a muffle furnace and calcined to 840°C, the heating rate was 4°C / min, and kept for 8 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium ion batteries.

[0020] The all-ceramic separator for lithium-ion batteries has a porosity of 52.4%, a liquid absorption rate of 183%, and a discharge specific capacity of 89.8mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

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Abstract

The invention relates to a full-ceramic diaphragm for a lithium ion battery and a preparation method thereof, and belongs to the field of diaphragm materials. According to the method, natural porous mineral diatomite is used as a main raw material, lithium carbonate and a small amount of titanium dioxide are added, a small amount of binder is used, high-temperature calcination is performed after compression molding, and the full-ceramic diaphragm for the lithium ion battery taking titanium-doped lithium silicate as the main component can be obtained. The thermal stability temperature of the full-ceramic diaphragm exceeds 800 DEG C, so that the problem of short circuit and fire in the battery caused by thermal shrinkage deformation of the diaphragm of the traditional lithium ion battery iseffectively avoided, and the safety of the lithium ion battery is remarkably improved. The full-ceramic diaphragm is high in porosity and large in liquid absorption rate, the titanium-doped lithium silicate component in the diaphragm can promote dissociation of lithium salt in electrolyte of the lithium ion battery, lithium ion transmission is promoted, and the capacity retention ratio of the battery during large-current charging and discharging and long-time operation is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and relates to a high-temperature-resistant, power-type lithium-ion battery diaphragm suitable for high-current charging and discharging and a preparation method thereof. Background technique: [0002] The wide application of lithium-ion batteries has promoted the development of electric vehicles, and the separator, which is the core component of the battery, is ushering in a new round of development peak. The diaphragm used in the power lithium-ion battery is obviously different from the ordinary lithium-ion battery diaphragm. The former provides power for vehicles such as vehicles and needs to provide higher voltage, greater power and more electricity. Therefore, the diaphragm is proposed higher requirements. At present, commercial lithium-ion battery separator materials are mainly porous polyolefins such as polyethylene (PE), polypropylene / polyethylene (PP / PE) films, et...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/491
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
Inventor 薛兵杨阔李冬妮李晔李芳菲雒锋
Owner JILIN UNIV
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