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CN-122025940-A - Aluminum plastic film for long-life lithium battery and production process thereof

CN122025940ACN 122025940 ACN122025940 ACN 122025940ACN-122025940-A

Abstract

The invention discloses an aluminum-plastic film for a long-life lithium battery, which comprises a heat sealing layer with an opening agent embedded in the surface, wherein the opening agent comprises composite microspheres, the composite microspheres are mesoporous inorganic microspheres with water-absorbing expansion particles loaded in the composite microspheres, the thickness of the heat sealing layer is T Heat sealing , the average particle size of the water-absorbing expansion particles is D Microparticles , the average particle size of the mesoporous inorganic microspheres is D microsphere(s) , and the average mesoporous pore diameter of the mesoporous inorganic microspheres is D Mesoporous pores . The aluminum plastic film for the long-life lithium battery has reasonable formula and excellent opening performance and heat sealing performance, the mesoporous inorganic microsphere loaded with the water-absorbing expansion microsphere is used as the opening agent of the heat sealing layer, the water-absorbing performance of the opening agent is endowed, the service life of the battery is prolonged, and the composite microsphere is used as the opening agent, so that the capacity attenuation amplitude of the battery in an extreme environment is smaller. The invention also discloses a production process of the aluminum-plastic film for the long-life lithium battery.

Inventors

  • CHAO CHENGPENG
  • ZHOU TING

Assignees

  • 江阴苏达汇诚复合材料有限公司

Dates

Publication Date
20260512
Application Date
20251209

Claims (10)

  1. 1. The aluminum-plastic film for the long-life lithium battery comprises a heat sealing layer with an opening agent embedded in the surface, and is characterized in that the opening agent comprises composite microspheres, the composite microspheres are mesoporous inorganic microspheres with water-absorbing expansion particles loaded inside, the thickness of the heat sealing layer is T Heat sealing , the average particle size of the water-absorbing expansion particles is D Microparticles , the average particle size of the mesoporous inorganic microspheres is D microsphere(s) , and the average mesoporous pore diameter of the mesoporous inorganic microspheres is D Mesoporous pores .
  2. 2. The aluminum-plastic film for long-life lithium battery according to claim 1, wherein the water-swelling particles are at least one of polyacrylamide microspheres, polyacrylic acid microspheres and polyvinyl alcohol microspheres; And/or the mesoporous inorganic microsphere is at least one of a mesoporous silica microsphere, a mesoporous carbon microsphere and a mesoporous titanium oxide microsphere.
  3. 3. The aluminum-plastic film for long-life lithium batteries according to claim 1, wherein the heat-sealing layer comprises a ternary polypropylene and a POE elastomer, and the mass ratio of the ternary polypropylene to the POE elastomer is 7 (2.8-3.1).
  4. 4. The aluminum-plastic film for long-life lithium batteries according to claim 1, wherein the mass ratio of the water-swellable particles to the mesoporous inorganic microspheres is 1 (9-15).
  5. 5. The aluminum-plastic film for long-life lithium batteries according to claim 1, wherein D microsphere(s) ：T Heat sealing is 1 (12-20).
  6. 6. The aluminum-plastic film for long-life lithium batteries of claim 5, wherein D microsphere(s) ：D Mesoporous pores is 100-210.
  7. 7. The aluminum-plastic film for long-life lithium batteries according to claim 1, wherein D Microparticles ：D Mesoporous pores is 0.5 to 0.7.
  8. 8. A production process of an aluminum-plastic film for a long-life lithium battery, based on the aluminum-plastic film for a long-life lithium battery as claimed in any one of claims 1 to 7, characterized by comprising the following steps: s1, dispersing mesoporous inorganic microspheres and water-swelling microspheres of an adsorbent in a dispersing agent; s2, purifying the dispersion system obtained in the step S1; S3, drying the purified product obtained in the step S2 to obtain the composite microsphere.
  9. 9. The process for producing a long-life aluminum-plastic film for lithium batteries according to claim 8, wherein S3 is vacuum-dried.
  10. 10. The process for producing a long-life aluminum-plastic film for a lithium battery according to claim 8, further comprising the steps of: And casting the heat-sealing layer resin, spreading composite microspheres on the surface of the heat-sealing layer resin which is not solidified, heating the heat-sealing layer resin to a melting point, and cooling the heat-sealing layer resin to obtain the heat-sealing film.

Description

Aluminum plastic film for long-life lithium battery and production process thereof Technical Field The invention relates to the technical field of aluminum plastic films, in particular to an aluminum plastic film for a long-life lithium battery and a production process thereof. Background The aluminum plastic film is a key packaging material of the soft package lithium battery, and the water-proof performance is one of the core indexes. Common aluminum plastic films generally include a heat seal layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, and a skin layer laminated in that order. In order to improve the opening performance of the aluminum plastic film, an opening agent is generally added in the heat sealing layer of the aluminum plastic film. The opening agent for the aluminum plastic film is divided into two types, namely a penetration dissociation type opening agent and a microparticle type opening agent, and is also called an organic opening agent and an inorganic opening agent. Currently, improvement of the opening agent by aluminum plastic film manufacturers is generally based on improving the opening performance of the opening agent or reducing the cost of the opening agent. The Chinese patent application publication No. CN 119029430A introduces modified silicon dioxide into the CPP film used as a heat seal layer, the modified silicon dioxide endows the CPP film with excellent anti-blocking property, slipping property and mechanical strength, and obviously reduces precipitation and volatilization of a slipping agent in the heat seal and curing process, solves the problem that the friction coefficient of the CPP film is increased after compounding, reduces phenomena of adhesion, uneven stress and the like when the aluminum plastic film is cured, and reduces damage and deformation of the film in the mold shell punching process. However, if only the opening performance of the opening agent is optimized or the cost of the opening agent is reduced, the effect is still limited for improving the overall performance of the aluminum plastic film. Developing an opening agent with new functions (such as prolonging the service life of an aluminum plastic film) is a necessary choice for aluminum plastic film manufacturers to break through the current performance bottleneck and meet the high-end market demands. Disclosure of Invention One of the purposes of the invention is to overcome the defects in the prior art and provide an aluminum plastic film for a long-life lithium battery, and the lithium battery adopting the aluminum plastic film can still keep higher battery capacity after being subjected to extreme environmental test. In order to solve the technical problems, the invention provides an aluminum-plastic film for a long-life lithium battery, which comprises a heat sealing layer with an opening agent embedded on the surface, wherein the opening agent comprises composite microspheres, the composite microspheres are mesoporous inorganic microspheres with water-absorbing expansion particles loaded inside, the thickness of the heat sealing layer is T Heat sealing , the average particle size of the water-absorbing expansion particles is D Microparticles , the average particle size of the mesoporous inorganic microspheres is D microsphere(s) , and the average mesoporous pore diameter of the mesoporous inorganic microspheres is D Mesoporous pores . The preferable technical scheme is that the water-swelling particles are at least one of polyacrylamide microspheres, polyacrylic acid microspheres and polyvinyl alcohol microspheres; And/or the mesoporous inorganic microsphere is at least one of a mesoporous silica microsphere, a mesoporous carbon microsphere and a mesoporous titanium oxide microsphere. The preferable technical scheme is that the heat sealing layer comprises components of ternary polymerization polypropylene and POE elastomer, wherein the mass ratio of the ternary polymerization polypropylene to the POE elastomer is 7 (2.8-3.1). Further, the mass ratio of the ternary polymerization polypropylene to the POE elastomer can be selected from 7:2.8, 7:2.9, 7:3 and 7:3.1 point values or interval values of the maximum value and the minimum value. The preferable technical scheme is that the mass ratio of the water-swelling particles to the mesoporous inorganic microspheres is 1 (9-15). Further, the mass ratio of the water-swelling particles to the mesoporous inorganic microspheres can be selected from the group consisting of 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, and 1:15 point values or the interval value between the maximum value and the minimum value. The preferable technical scheme is that D microsphere(s) ：T Heat sealing is 1 (12-20). Further, D microsphere(s) ：T Heat sealing may be selected as 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20 point values or interval values of the two point values as maximum and minimum values. The preferable technical scheme is