CN107623098A - A kind of lithium ion battery safety coatings, its application and lithium ion battery - Google Patents
A kind of lithium ion battery safety coatings, its application and lithium ion battery Download PDFInfo
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- CN107623098A CN107623098A CN201610567375.5A CN201610567375A CN107623098A CN 107623098 A CN107623098 A CN 107623098A CN 201610567375 A CN201610567375 A CN 201610567375A CN 107623098 A CN107623098 A CN 107623098A
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Abstract
The invention discloses a kind of lithium ion battery safety coatings, and it is made by vinyl silicane coupling agent, binding agent and polyethylene microballoon by following steps：Toluene and vinyl silicane coupling agent are added to polyethylene microballoon, back flow reaction 20~28 hours, polyethylene powders are made after filtration drying, then mix polyethylene powders with binding agent, successively by being dispersed with stirring obtained safety coatings slurry, by the coated rear formation safety coatings of safety coatings slurry；The invention also discloses the application process of lithium-ion safe coating and corresponding lithium ion battery.Safety coatings of the present invention have heat blocking characteristic, can hinder the transmission of the lithium ion in electrolyte, cause heat production side reaction no longer to occur, and improve the thermal stability property of battery；Safety coatings have excellent organic solvent-resistant characteristic, voltage-resistent characteristic, possess lithium ion battery applicability；Obtained lithium ion battery has high security, the advantages that not smoldering, be not on fire, not burning.
Description
Technical field
The present invention relates to technical field of lithium-ion battery, more particularly, to a kind of lithium ion battery safety coatings, its
Using and lithium ion battery.
Background technology
In recent years, the fast development in the field such as portable type electronic product, electric automobile, energy-accumulating power station, to energy storage skill
Art proposes higher requirement.Lithium ion battery turns into the primary selection in these fields due to its high energy density, and
Its energy density also more and more higher.Along with lithium ion battery energy density more and more higher, the safety problem that it faces is increasingly
Sternness, the terminal for seriously limiting lithium ion battery with high energy density use.The safety problem of lithium ion battery is mainly
Due to caused by battery thermal runaway.Inside battery causes internal temperature of battery persistently to raise, then drawn because abnormal exothermic reaction
Send out heat production side reaction more, cause battery catches fire or even explode, so as to the security of the lives and property of serious threat user.
In order to improve this problem, people improve the security feature of lithium ion battery using various strategies.It is main at present
Using following improved technology：First, improving the heat endurance of barrier film by ceramic coating, avoid causing because of barrier film thermal contraction
Both positive and negative polarity contacts, so as to slow down thermal runaway reaction；Second, using the material with positive temperature coefficient (PTC), imitated using its temperature
Should, internal resistance is improved when temperature raises, so as to block all kinds of side reactions in time, improves the security feature of battery.
Such as Chinese patent publication No. CN104269509A, on January 7 2015 patent disclosure day, a kind of lithium battery is disclosed
With ceramic coating membrane and preparation method thereof, it includes ceramic coating and base material barrier film, and ceramic coating is by aqueous ceramic coating materials
Material even application is made in base material membrane surface, and ceramic coated slurry includes 10~30wt% aluminum oxide, 0.5~3wt%
Bonding agent, 0.2~1.0wt% additive and 0.01~0.1wt% auxiliary agent, aluminum oxide is that particle diameter than D1/D2 is 0.10
~0.20 it is nano alumina powder jointed；The ceramic coating membrane thermal safety of technical scheme improves, electrolyte is moistened
Wet ability is strong, applies the cycle life that battery can be improved on lithium battery；But the barrier film of coated ceramic can only improve
The heat endurance of barrier film, heat production side reaction can not be blocked, therefore improvement is limited, is only capable of solution energy density at present and does not surpass
The safety problem of 200Wh/kg batteries is crossed, can not be widely used.And for example Chinese patent publication No. CN104409681A, patent disclosure
Day is on March 11st, 2015, discloses a kind of preparation method of the electrodes of lithium-ion batteries of coating containing PTC, prepared by this method
Pole piece is multiple coating pole piece, on a current collector before slurry of the coating comprising negative or positive electrode active material, in advance in afflux
Precoated shet of the coating with temperature sensitivity on body；Precoated shet with temperature sensitivity, its composition include binding agent, positive temperature
Section bar material and conductive agent；The weight ratio of binding agent, positive temperature mode material and conductive agent is (2~8)：(1~8)：(0~7)；This
The electrodes of lithium-ion batteries of the coating containing PTC prepared by the method that invention provides, the battery comprising the pole piece have it is good overcharge,
The security features such as short circuit, extruding, acupuncture；But its PTC coating includes a variety of high molecular polymers, its polymeric system not into
It is ripe, and less stable of these polymer in battery context, stability particularly in organic electrolyte and in width
The less stable of electrochemical window, at the same such polymer PTC coating high-volume process when in the presence of certain processing and manufacturing
Difficulty.
The content of the invention
To solve the above problems, the invention provides one kind to have heat blocking characteristic, with higher organic solvent-resistant and resistance to
Voltage performance and the lithium ion battery safety coatings that can be used for lithium battery pole slice and barrier film；
Present invention also offers a kind of application process of lithium ion battery safety coatings and corresponding lithium ion battery.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of lithium ion battery safety coatings, are made by following raw material：0.5~3.5wt% of vinyl silicane coupling agent, glue
2~10wt% of agent is tied, surplus is polyethylene microballoon.
Safety coating is mainly used on the positive/negative plate of lithium ion battery, due under normal circumstances on positive/negative plate just
Negative plate needs to carry out the exchange of lithium ion, i.e., to ensure under normal circumstances lithium ion by property, therefore safety coatings are not
Can be smooth one layer without space, while ensure that under high-temperature condition (about 140 DEG C) one layer can be converted into again can
The coating for preventing lithium ion from passing through；And the tiling of polyethylene microballoon, because spherical structure can not completely attach to, is deposited coated on pole piece
Allow lithium ion in small gap in the arbitrary motion of safety coatings both sides, the passing through property of lithium ion will not be reduced；Meanwhile in height
Under temperature state, polyethylene melts, and forms one layer of fine and close layer structure in pole piece or membrane surface, can play prevention lithium ion
Motion on pole piece both sides, prevent lithium ion battery from producing further high temperature, ensure the security performance of lithium ion battery.
Preferably, polyethylene microballoon is D50=0.2~1 μm of low density polyethylene (LDPE) microballoon.
Low density polyethylene (LDPE) has the fusing point lower than common polythene, and its fusing point can be more preferable closer to 140 DEG C
Guarantee lithium ion battery security performance, safety problem caused by avoiding lithium ion battery temperature too high；And 0.2~1 μm of model
Enclose the microballoon of size ensure under normal circumstances lithium ion can normal through while also can guarantee that in the case of a high temperature faster
The fine and close coating of formation obstructed passing through for lithium ion.
Preferably, vinyl silicane coupling agent is trimethoxyvinyl silane, Triethoxyvinylsilane or three
One kind in tert-butoxy vinyl silanes.
Preferably, binding agent is one or more mixtures in butadiene-styrene rubber, polyacrylamide or Kynoar.
Preferably, binding agent is Kynoar.
Preferably, lithium ion battery safety coatings are made by following steps：Polyethylene microballoon is added to polyethylene microballoon
The toluene that 5~20 times of quality, adds vinyl silicane coupling agent thereto, back flow reaction 20~28 hours at 70~90 DEG C,
Polyethylene powders are made after filtration drying, then mix polyethylene powders with binding agent, successively by being dispersed with stirring obtained peace
Full coating paste, by the coated rear formation safety coatings of safety coatings slurry.
The interface of polyethylene microballoon can be improved by adding vinyl silicane coupling agent, make its in follow-up dispersion process more
Easily scattered, resulting emulsion is also more stable.
A kind of application of lithium ion battery safety coatings, lithium ion battery safety coatings are located at lithium ion battery separator, just
The surface of pole piece or negative plate.
Although this safety coatings can also be applied to the barrier film of battery, because it can ensure lithium under normal circumstances
Ion is by obstructing the characteristic that lithium ion passes through, its effect can be more played applied to positive/negative plate under high temperature.
Preferably, when lithium ion battery safety coatings are applied, the thickness of safety coatings is 0.5~4 μm.
A kind of lithium ion battery, it uses the positive pole for coating lithium ion battery safety coatings as claimed in claim 7 or 8
One or more in piece, negative plate or barrier film, and the gross thickness of safety coatings is no more than on positive plate, negative plate and barrier film
8μm。
The too conference of safety coatings thickness reduce to a certain extent lithium ion under normal circumstances by property, generally
The safety coatings of 0.5 μ m-thick, which have been able to substantially to play a part of in high temperature to obstruct lithium ion, passes through the safety coatings of 2 μ m-thicks
Have been able to completely to play a part of in high temperature to obstruct lithium ion by.
Therefore, the invention has the advantages that：
(1) safety coatings have heat blocking characteristic, can hinder the transmission of the lithium ion in electrolyte, cause heat production pair
Reaction no longer occurs, and improves the thermal stability property of battery；
(2) safety coatings have excellent organic solvent-resistant characteristic, voltage-resistent characteristic, possess lithium ion battery applicability.
Embodiment
Technical scheme is further described with reference to embodiment.
Embodiment 1
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 2
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 3
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 4 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 4
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 5
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The cathode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 4 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 6
The preparation of lithium ion battery safety coatings：The toluene of 5 times of polyethylene microspheres quality, Xiang Qi are added to polyethylene microballoon
Middle addition vinyl silicane coupling agent, back flow reaction 20 hours at 70 DEG C, polyethylene powders are made after filtration drying, then will
Polyethylene powders mix with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silicane coupling agent
0.5wt%, binding agent 2wt%, polyethylene microballoon 97.5wt%, polyethylene microballoon are D50=0.2 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are trimethoxyvinyl silane, and binding agent is butadiene-styrene rubber.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 3.5 μm, barrier film
The barrier film with safety coatings is made in coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 7
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 8
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 9
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 4 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 10
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 11
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The cathode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 4 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 12
The preparation of lithium ion battery safety coatings：The toluene of 12 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 24 hours at 80 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 1wt%, binding agent 5wt%, polyethylene microballoon 94wt%, polyethylene microballoon are D50=0.5 μm of low density polyethylene (LDPE) microballoon,
Vinyl silicane coupling agent is Triethoxyvinylsilane, and binding agent is polyacrylamide.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 3.5 μm, barrier film
The barrier film with safety coatings is made in coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 13
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 14
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 2 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 15
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 4 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 16
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 2 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 17
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The cathode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating is thick
Spend for 4 μm, the barrier film with safety coatings is made in barrier film coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Embodiment 18
The preparation of lithium ion battery safety coatings：The toluene of 20 times of polyethylene microspheres quality is added to polyethylene microballoon, to
Vinyl silicane coupling agent is wherein added, back flow reaction 28 hours at 90 DEG C, polyethylene powders are made after filtration drying, then
Polyethylene powders are mixed with binding agent, successively by being dispersed with stirring obtained safety coatings slurry；Wherein, vinyl silanes are coupled
Agent 3.5wt%, binding agent 10wt%, polyethylene microballoon 86.5wt%, polyethylene microballoon are D50=1 μm of low density polyethylene (LDPE) is micro-
Ball, vinyl silicane coupling agent are three tert-butoxy vinyl silanes, and binding agent is Kynoar.
Safety coatings coat：The anode pole piece with safety coatings is made in positive plate coated safety coating paste, and coating is thick
Spend for 4 μm, the anode pole piece with safety coatings is made in negative plate coated safety coating paste, and coating thickness is 3.5 μm, barrier film
The barrier film with safety coatings is made in coated safety coating paste, and coating thickness is 0.5 μm.
Test the assembling of battery core：Negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Comparative example 1：This comparative example is assembled into flexible packing lithium ion battery using positive pole, negative pole and barrier film, positive/negative plate and
Barrier film is all free of coating；Prepared negative plate, positive plate and barrier film are prepared into battery according to the preparation technology of laminated batteries；
After carrying out preliminary filling, chemical conversion and evacuation to battery, a partial volume and secondary partial volume are carried out respectively, obtain testing battery core.
Comparative example 2：This comparative example is assembled into flexible packing lithium ion battery using positive pole, negative pole and barrier film；Positive/negative plate is not
Provided with coating, barrier film is provided with the existing ceramic coating of 2 μ m-thicks；By prepared negative plate, positive plate and provided with 2 μm of ceramic coatings
Barrier film prepares battery according to the preparation technology of laminated batteries；After carrying out preliminary filling, chemical conversion and evacuation to battery, carry out once respectively
Partial volume and secondary partial volume, obtain testing battery core.
Positive plate and negative plate are made by the following method in above-described embodiment and comparative example：
The preparation of positive plate：By positive electrode active materials and conductive agent (SP), adhesive solution (PVDF) according to mass ratio 93:
3:4 ratio is well mixed, and is coated on aluminium foil, is dried and is rolled, positive electrode active materials used are NMC system activity materials
Material, i.e. nickle cobalt lithium manganate system positive electrode.
The preparation of negative plate：By graphite cathode, conductive agent (SP), thickener (CMC), bonding agent SBR according to 94:2:1.5:
After 2.5 part by weight is mixed evenly, copper foil surface is coated on, by drying and rolling, obtains cathode pole piece.
Performance test：
All embodiments and comparative example inner walkway and safety test are tested；The inner walkway state of battery core is 50%
SOC states, safety test state are 100%SOC states.Safety test experiment includes pin prick test and hotbox test.
It is as shown in table 1 with test result：
Experiment conclusion：Safety coatings involved in the present invention can be effectively improved the safety of acupuncture characteristic and heat of NMC systems
Case security feature, and DC internal resistance on battery and AC internal Resistance influence to be no more than 20%, possess the bar for improving cell safety
Part.
Claims (9)
1. a kind of lithium ion battery safety coatings, it is characterised in that be made by following raw material：Vinyl silicane coupling agent 0.5~
3.5wt%, 2~10wt% of binding agent, surplus are polyethylene microballoon.
A kind of 2. lithium ion battery safety coatings according to claim 1, it is characterised in that：Described polyethylene microballoon is
D50=0.2~1 μm of low density polyethylene (LDPE) microballoon.
A kind of 3. lithium ion battery safety coatings according to claim 1, it is characterised in that：Described vinyl silanes are even
Connection agent is one kind in trimethoxyvinyl silane, Triethoxyvinylsilane or three tert-butoxy vinyl silanes.
A kind of 4. lithium ion battery safety coatings according to claim 1, it is characterised in that：Described binding agent is butylbenzene
One or more mixtures in rubber, polyacrylamide or Kynoar.
A kind of 5. lithium ion battery safety coatings according to claim 1 or 4, it is characterised in that：Described binding agent is
Kynoar.
6. a kind of lithium ion battery safety coatings according to claim 1, it is characterised in that be made by following steps：Xiang Ju
Ethene microballoon adds the toluene of 5~20 times of polyethylene microspheres quality, vinyl silicane coupling agent is added thereto, at 70~90 DEG C
Lower back flow reaction 20~28 hours, polyethylene powders are made after filtration drying, then mix polyethylene powders with binding agent, according to
Secondary process is dispersed with stirring obtained safety coatings slurry, by the coated rear formation safety coatings of safety coatings slurry.
A kind of 7. application of lithium ion battery safety coatings according to claim 1, it is characterised in that：Described lithium ion
Cell safety coating is located at the surface of lithium ion battery separator, positive plate or negative plate.
8. the application of lithium ion battery safety coatings according to claim 7, it is characterised in that：Described lithium ion battery
When safety coatings are applied, the thickness of safety coatings is 0.5~4 μm.
A kind of 9. lithium ion battery, it is characterised in that：It uses coating lithium ion battery safety as claimed in claim 7 or 8
One or more in the positive plate of coating, negative plate or barrier film, and on positive plate, negative plate and barrier film safety coatings it is total
Thickness is no more than 8 μm.
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