Preparation method and application of porous SiO2 microspheres for lithium ion battery diaphragm
A lithium-ion battery and separator technology, which is applied in the field of preparation of porous SiO2 microspheres, can solve the problems of lower gas permeability, achieve the effect of improved ion conductance and simple operation
Inactive Publication Date: 2020-02-07
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
By coating porous silica particles, the conductivity of lithium ions is improved, but the gas permeability of the PP-based film coated with porous silica particles is 205s, although compared with the PP-based film coated with non-porous silica particles film, the air permeability value has decreased (that is, the air permeability has been improved), but its air permeability still has a lot of room for improvement compared with the original air permeability of the uncoated base film
Method used
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Embodiment 1
[0056] (1) Preparation of spherical SiO 2 Particles: Mix 5mLTEOS and 5mL ethanol to obtain mixture 1; add mixture 1 to a mixed solvent composed of 3mL ammonia water, 15mL ethanol and 4mL water to obtain mixture 2; heat mixture 2 to 50 degrees, first stir at 1100rpm for 10min, then turn to Stir at 400rpm for 2 hours, centrifuge, and wash to obtain spherical SiO 2 particles;
Embodiment 2
[0058] The difference between this example and Example 1 is that in (1) TEOS is 1 mL, and ammonia water is 1 mL; in (1), mixture 2 is heated to 25 degrees, and the rest are the same as in Example 1.
Embodiment 3
[0060] The spherical SiO prepared by embodiment 1 2 Add 0.5g of particles into 50g of water, add 1g of PVP, heat up to 90 degrees, reflux for 2 hours, then add 1g of 2mol / L NaOH solution after cooling down to room temperature, stir for 30 minutes, centrifuge and wash to obtain porous SiO 2 Microspheres.
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Abstract
The invention provides a preparation method and application of porous SiO2 microspheres for a lithium ion battery diaphragm, which belong to the technical field of battery diaphragm coating. The preparation method for the porous SiO2 microspheres for the lithium ion battery diaphragm comprises the following steps of: preparing spherical SiO2 particles, adding the prepared spherical SiO2 particlesinto water, adding a protective agent, adding an alkaline solution, conducting stirring, conducting centrifuging and cleaning after etching for a certain time and acquiring a porous SiO2 microspheres.In addition, the invention also provides application of the porous SiO2 microspheres for the lithium ion battery diaphragm, and the application comprises the following steps of: taking a certain amount of porous SiO2 microspheres, dispersing the porous SiO2 microspheres by using a dispersing agent, adding a certain amount of a binder, preparing a coating solution, and coating a base membrane by using the coating solution. The porous SiO2 microspheres prepared by the preparation method disclosed by the invention are simple to prepare, and the coated diaphragm is good in air permeability and good in thermal stability, and has a good application prospect.
Description
technical field [0001] The invention belongs to the technical field of battery diaphragm coating, and in particular relates to a porous SiO used for a lithium-ion battery diaphragm 2 Preparation method and application of microspheres. Background technique [0002] In recent years, with the rapid development of electric vehicles and portable electronic products and the use of large lithium-ion power batteries, the lithium battery industry has developed rapidly. Due to the expansion of application fields and increase in demand, the shape and size of batteries are changing, and lithium secondary batteries are required to have better durability and safety than existing small batteries. [0003] From the perspective of lithium battery safety, more and more battery companies have begun to turn their attention to the field of diaphragm coating modification to produce composite lithium-ion battery diaphragms. The existing coated diaphragms are mainly coated with PP, PE and non-wov...
Claims
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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/409Y02E60/10
Inventor 王海辉王素清薛健
Owner SOUTH CHINA UNIV OF TECH
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