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
CN111477819AActive Publication Date: 2020-07-31JILIN UNIV
10 Cites 3 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JILIN UNIV
Publication Date
2020-07-31

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More