Preparation method of positive electrode and negative electrode of light-cured flexible wearable lithium ion battery

Abstract

The invention is suitable for the field of photocuring additive manufacturing, and provides a preparation method for preparing one-dimensional, two-dimensional and three-dimensional flexible wearable lithium ion battery materials through photocuring. The system comprises 1 to 12 parts of a prepolymer, 1 to 10 parts of a diluent, 1 to 12 parts of a surface modifier, 1 to 8 parts of a dispersant, 0.1 to 1 part of an antifoaming agent, 0.1 to 1 part of an initiator, 1 to 10 parts of carbon nanotubes (CNT), 1 to 20 parts of lithium iron phosphate (LFP) and 1 to 20 parts of lithium titanate (LTO). According to the invention, one-dimensional, two-dimensional and three-dimensional flexible wearable lithium ion batteries are formed through a photocuring technology, so that the lithium ion batteries can be widely applied to the aspects of forming high-precision ultra-thick low-torsion electrodes, electrolyte, electrolyte supports and the like.

Description

Technical Field

[0001] The present invention belongs to the field of materials science and engineering-polymer technology, and in particular relates to photocuring to prepare a series of one-dimensional, two-dimensional, and three-dimensional flexible wearable lithium-ion battery materials. Background Art

[0002] With the continuous development of the flexible electronics industry and nanotechnology, people have greatly enriched the market prospects of lithium-ion flexible batteries through structural design and the development of flexible materials. However, most of them are designed based on the structure of traditional batteries, that is, the full battery is a sandwich structure consisting of a positive electrode, a separator and a negative electrode stacked together. For batteries with relatively thin thickness, they have good flexibility. However, for batteries with relatively large loads and relatively large thickness, when the bending range is relatively large, problems such as overall electrode slippage or motor damage are likely to occur. Therefore, designing a new type of electrode that has both a relatively large load capacity and can withstand relatively large bending strength is an urgent problem to be solved in the field of flexible wearable batteries.

[0003] As an emerging battery preparation method, photocuring technology has shown great development prospects in forming high-precision ultra-thick low-twist electrodes, electrolytes, and electrolyte supports. The present invention uses photocuring technology to form one-dimensional, two-dimensional, and three-dimensional flexible wearable lithium-ion batteries, so that they can meet the application of various flexible, wearable electronics and other fields. Summary of the invention

[0004] The embodiments of the present application provide a one-dimensional, two-dimensional, or three-dimensional flexible wearable lithium-ion battery formed by photocuring technology, and construct a flexible battery with an ultra-thick, low-distortion three-dimensional structure formed by photocuring.

[0005] The embodiment of the present application is to realize a wearable one-dimensional, two-dimensional, or three-dimensional flexible lithium-ion battery, comprising the following raw materials in parts by weight:

[0006] 1-12 parts of prepolymer, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer, 0.1-1 parts of initiator, 1-10 parts of carbon nanotube (CNT), 1-20 parts of lithium iron phosphate (LFP), and 1-20 parts of lithium titanate (LTO).

[0007] The present application also provides a method for preparing a one-dimensional, two-dimensional, or three-dimensional flexible wearable lithium-ion battery, comprising:

[0008] Mix 1-12 parts of argon, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer and 0.1-1 parts of initiator, and stir evenly to obtain a photosensitive resin;

[0009] 1-20 parts of dried lithium iron phosphate (LFP) and 1-20 parts of lithium titanate (LTO) are dried, sieved, and put into a ball mill, ball milled with anhydrous ethanol as a medium, dried, ground, sieved, and lithium iron phosphate and lithium titanate powders are obtained for later use;

[0010] The modified lithium iron phosphate, lithium titanate powder and photosensitive resin are mixed, and then resin is added for ball milling. After taking out, vacuum stirring is used to remove bubbles to obtain the product.

[0011] Use DLP technology to form wearable one-dimensional, two-dimensional, and three-dimensional flexible lithium-ion batteries. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present application more clear, the present application is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0013] The embodiments of the present application provide a one-dimensional, two-dimensional, or three-dimensional flexible wearable lithium-ion battery system, comprising the following raw materials in parts by weight:

[0014] 1-12 parts of prepolymer, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer, 0.1-1 parts of initiator, 1-10 parts of carbon nanotube (CNT), 1-20 parts of lithium iron phosphate (LFP), and 1-20 parts of lithium titanate (LTO).

[0015] Wherein, the oligomer is one or more of epoxy acrylate, polyurethane acrylate and polyester acrylate.

[0016] Wherein, the diluent is one or more of hexanediol diacrylate, trimethylolpropane triacrylate, and tripropylene glycol diacrylate.

[0017] Wherein, the photoinitiator is one or more of trimethylbenzoyldiphenylphosphine oxide, trimethylbenzoylethylphosphonate, hydroxycyclohexylphenylketone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0018] Wherein, the dispersant is a polymer super dispersant, preferably one or more of EFKA4703, Solsperse AC7570, and Solsperse 41000.

[0019] Wherein, the surface modifier is a silane coupling agent, and the dispersant is a polymer super dispersant, preferably one or more of KH550, KH560, and KH570.

[0020] Wherein, the defoaming agent is one of B-0846, B-0847, B-0848 or several of them in any proportion, provided by Nanjing Jiazhong Chemical Technology Co., Ltd.

[0021] Wherein, the carbon nanotube (CNT) 1-10 parts, lithium iron phosphate (LFP) 1-20 parts, and lithium titanate (LTO) are provided by Sinopharm Chemical Reagent Co., Ltd.

[0022] Implementation Case 1

[0023] The present application also provides a wearable one-dimensional, two-dimensional, or three-dimensional flexible lithium-ion battery, including:

[0024] Mix 1-12 parts of argon, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer and 0.1-1 parts of initiator, and stir evenly to obtain a photosensitive resin;

[0025] Among them, the stirring method is magnetic stirring.

[0026] 20 parts of LFP powder, LTO powder and 1-10 parts of CNT powder are ball-milled with anhydrous ethanol as a medium, taken out and dried in an oven, ground and sieved to obtain ball-milled LFP and LTO powders, and then dried, ground and sieved to obtain modified zirconia powder for use;

[0027] Use DLP technology to form wearable one-dimensional, two-dimensional, and three-dimensional flexible lithium-ion batteries.

[0028] Example 1

[0029] Take 5 parts of epoxy acrylate, 2 parts of tripropylene glycol diacrylate, 3 parts of KH560, 0.1 parts of trimethylbenzoyl diphenylphosphine oxide, and 2 parts of defoaming agent B-0846, and stir them magnetically for 24 hours to obtain a photosensitive resin.

[0030] Take 15 parts of lithium iron phosphate (LFP), lithium titanate (LTO) and 2 parts of carbon nanotubes (CNT), dry them, sieve them and put them into a ball mill, use anhydrous ethanol as a medium for ball milling, dry, grind and sieve to obtain lithium iron phosphate and lithium titanate powders for use, and the ball milling beads are all zirconium oxide. Use a planetary ball mill at 400rpm for 24 hours, take out the suspension, filter, dry, grind and sieve to obtain modified zirconium oxide powder.

[0031] Take 15 parts of lithium iron phosphate (LFP), lithium titanate (LTO) and 2 parts of carbon nanotubes and photosensitive resin, put them into a ball mill, add 50 parts of 10mm ball milling beads and 100 parts of 5mm ball milling beads, ball mill for 24 hours, take them out and put them into a vacuum stirring tank, and vacuum stir to remove bubbles to obtain a photocurable mixed liquid.

[0032] The DLP printer is used to photocuring the h mixed liquid to print the part blank, and the blank is cleaned with ultrasonic waves using distilled water as the medium, and the attached mixed liquid and water are washed away with air flow and then dried. Wearable one-dimensional, two-dimensional, and three-dimensional flexible lithium-ion batteries are formed.

Claims

1. One-dimensional, two-dimensional, and three-dimensional flexible wearable lithium-ion battery systems, characterized in that: 1-12 parts of prepolymer, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer, 0.1-1 parts of initiator, 1-10 parts of carbon nanotube (CNT), 1-20 parts of lithium iron phosphate (LFP), and 1-20 parts of lithium titanate (LTO).

2. The oligomer as claimed in claim 1 is one or more of epoxy acrylate, polyurethane acrylate and polyester acrylate.

3. The diluent as claimed in claim 1 is one or more of hexanediol diacrylate, trimethylolpropane triacrylate, and tripropylene glycol diacrylate.

4. The photoinitiator as claimed in claim 1 is one or more of trimethylbenzoyldiphenylphosphine oxide, trimethylbenzoylethylphosphonate, hydroxycyclohexylphenylketone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

5. The surface modifier as claimed in claim 1 is a silane coupling agent and the dispersant is a polymer super dispersant, preferably one or more of KH550, KH560, and KH570.

6. The dispersant as claimed in claim 1 is a polymer super dispersant, preferably one or more of EFKA 4703, Solsperse AC7570, Solsperse 41000.

7. The defoaming agent as claimed in claim 1 is one of B-0846, B-0847, B-0848 or several of them in any proportion, provided by Nanjing Jiazhong Chemical Technology Co., Ltd. Mix 1-12 parts of iodine, 1-10 parts of diluent, 1-12 parts of surface modifier, 1-8 parts of dispersant, 0.1-1 parts of defoamer and 0.1-1 parts of initiator, stir evenly to obtain photosensitive resin; dry 1-20 parts of lithium iron phosphate (LFP) and 1-20 parts of lithium titanate (LTO), sieve them and put them into a ball mill, use anhydrous ethanol as a medium for ball milling, dry, grind and sieve to obtain lithium iron phosphate and lithium titanate powders for use. Mix the modified lithium iron phosphate, lithium titanate powder and photosensitive resin, add resin for ball milling, take out and use vacuum stirring to remove bubbles to obtain. Use DLP technology to form wearable one-dimensional, two-dimensional and three-dimensional flexible lithium-ion batteries.