Full-ceramic lithium ion battery diaphragm and preparation method thereof

A technology of lithium-ion batteries and ceramics, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of high temperature easy shrinkage, decomposition, and affecting the thermal stability of the diaphragm, so as to eliminate safety problems and eliminate internal short circuits in the battery , Promote the effect of lithium ion transport

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Diatomaceous earth, lithium hydroxide, lanthanum oxide, methyl cellulose, and distilled water are mixed uniformly in a mass ratio of 88:7:0.1:0.4:4.5, molded, dried at 80°C for 4 hours, and calcined in a muffle furnace to 500°C. Insulate for 6 hours, and the heating rate is 9°C / min; the obtained calcined sample is soaked in 0.05mol / L hydrochloric acid for 10 minutes, rinsed with distilled water until neutral, and dried at 100°C for 8 hours to obtain the all-ceramic lithium-ion battery separator.

[0014] The all-ceramic lithium-ion battery separator has a porosity of 53.5%, a liquid absorption rate of 179%, and a discharge specific capacity of 92.9mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 2

[0016] Diatomaceous earth, lithium hydroxide, lanthanum oxide, hydroxypropyl methylcellulose, and distilled water are mixed uniformly in a mass ratio of 88:7:0.2:0.3:4.5, molded, dried at 80°C for 4 hours, and calcined in a muffle furnace to 520°C, keep warm for 5 hours, and the heating rate is 8°C / min; the obtained calcined sample is soaked in 0.05mol / L hydrochloric acid for 10 minutes, rinsed with distilled water until neutral, and dried at 100°C for 8 hours to obtain the all-ceramic lithium-ion battery separator .

[0017] The all-ceramic lithium-ion battery separator has a porosity of 51.4%, a liquid absorption rate of 168%, and a discharge specific capacity of 90.1mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 3

[0019] Diatomaceous earth, lithium hydroxide, cerium oxide, hydroxyethyl cellulose, and distilled water are mixed uniformly in a mass ratio of 88:7:0.3:0.2:4.5, molded, dried at 80°C for 4 hours, and calcined in a muffle furnace to 540°C , kept warm for 4 hours, and the heating rate was 7°C / min; the obtained calcined sample was soaked in 0.05mol / L hydrochloric acid for 10 minutes, rinsed with distilled water until neutral, and dried at 100°C for 8 hours to obtain the all-ceramic lithium-ion battery separator.

[0020] The all-ceramic lithium-ion battery separator has a porosity of 54.6%, a liquid absorption rate of 189.0%, and a discharge specific capacity of 96.6mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

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Abstract

The invention relates to a full-ceramic lithium ion battery diaphragm and a preparation method thereof, and belongs to the field of diaphragm materials. According to the method, diatomite is used as amain raw material, lithium hydroxide is matched, a small amount of rare earth elements are doped, an organic binder is used for molding, and the full-ceramic lithium ion battery diaphragm taking silicon dioxide and lithium silicate as main components is formed after high-temperature calcination. The diaphragm is excellent in thermal stability, and the safety problem that a traditional lithium ionbattery diaphragm shrinks and deforms due to heating to cause short circuit and fire in a battery is thoroughly solved. Meanwhile, the diaphragm has the characteristics of good electrolyte affinity,high porosity and large liquid absorption capacity, the mass transfer efficiency of lithium ions in the battery is effectively promoted, and the capacity retention ratio of the battery during high-current charging and discharging and long-time operation is improved.

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 development of electric vehicles has put forward higher requirements for power lithium-ion batteries. As an important component of lithium-ion batteries, the diaphragm material has an important impact on the usability and safety of batteries. At present, commercial lithium-ion battery separator materials are mainly porous polyolefins such as polyethylene (PE), polypropylene / polyethylene (PP / PE) films, etc. Although polyolefin separators have many advantages for lithium-ion batteries, their Problems such as low porosity and poor wettability to the electrolyte are not conducive to high-current charging and discharging of power batteries and capacity retention for long-term ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
Inventor 薛兵李晔李冬妮杨阔李芳菲雒锋
Owner JILIN UNIV
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