A method for preparing solid-state lithium-ion batteries by photocuring 3D printing

A lithium-ion battery, 3D printing technology, applied in secondary batteries, secondary battery manufacturing, 3D object support structures, etc. Complex processes and other problems, to achieve the effect of improving interface compatibility, shortening process cycle, and improving ionic conductivity

Active Publication Date: 2021-04-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the presence of solvent water, subsequent freeze-drying and heat treatment are still required to obtain the final electrode, which has the problems of complicated preparation process, time-consuming and energy-consuming, and poor cycle stability of the battery.
[0006] In summary, the existing 3D printing technology to prepare solid-state lithium-ion batteries uses traditional liquid electrolytes, which need to be encapsulated with polymer shells, or require subsequent drying or heat treatment to remove solvents after 3D printing. The preparation process is complex and time-consuming. Poor performance and battery cycle stability

Method used

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  • A method for preparing solid-state lithium-ion batteries by photocuring 3D printing
  • A method for preparing solid-state lithium-ion batteries by photocuring 3D printing
  • A method for preparing solid-state lithium-ion batteries by photocuring 3D printing

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preparation example Construction

[0075] Preparation of photosensitive polymer network matrix: mix photosensitive resin, photoinitiator and polymer matrix according to a certain mass ratio to form semi-IPN, the semi-interpenetrating polymer network framework Semi-IPN, and then mix lithium salt solution and semi-interpenetrating polymer framework Semi-IPN -IPN mixed to obtain a photosensitive polymer network matrix with lithium ion conductivity.

[0076] Preparation of inorganic oxide nano-active fillers: As one of the key improvements of the present invention, the product obtained in this step—ceramic nanoparticles with lithium-ion conductive activity plays an important role in the printing and ionic conductivity of composite solid electrolytes. important influence. The corresponding salts can be added to ethylene glycol in sequence, and then citric acid monohydrate is added to stir to obtain a clear solution; the obtained clear solution is heated to reflux, aged, carbonized, and then calcined at a high temper...

Embodiment 1

[0085] figure 1 It is a schematic diagram of the process flow for preparing a solid-state lithium-ion battery by 3D printing constructed according to the present invention, figure 2 It is a schematic diagram for exemplarily showing the composition and structure of a solid-state lithium-ion battery prepared according to the present invention. Such as figure 1 As shown in , the process mainly includes the following process steps:

[0086] First, the preparation of the photosensitive polymer network matrix.

[0087] In this step, a photosensitive resin (ethoxylated trimethylolpropane triacrylate (ETPTA, Aldrich) containing 1.0 wt% of photoinitiator (2-hydroxy-2-methyl-1-phenyl- 1-acetone (HMPP) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP, Sigma, HFP content 6mol%), mixed according to a certain mass ratio (ETPTA / PVdF-HFP=75 / 25 (w / w)) , to form a semi-interpenetrating polymer network skeleton IPN, and then lithium salt solution (1M LiClO 4 solution, th...

Embodiment 2

[0108] A photosensitive polymer network matrix used for photocuring 3D printing to prepare solid-state lithium-ion batteries, the photosensitive polymer network matrix includes a semi-interpenetrating polymer network skeleton and a lithium salt solution; the lithium salt solution is dispersed in the semi- In the interpenetrating polymer network skeleton, wherein: the semi-interpenetrating polymer network skeleton includes a photosensitive resin, a photoinitiator and a polymer matrix, the photosensitive resin has a network crosslinked structure, and the photoinitiator is used to initiate The photosensitive resin undergoes a polymerization reaction; the polymer matrix has a linear non-crosslinked structure; the lithium salt solution is an organic solution obtained by dissolving lithium salt in an organic solvent.

[0109] The lithium salt in the lithium salt organic solution is lithium tetrafluoroborate, the organic solvent is sebaconitrile, and the concentration of the lithium s...

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Abstract

The invention belongs to the technical field of lithium-ion battery preparation, and more specifically relates to a method for preparing a solid-state lithium-ion battery by photocuring 3D printing. In this method, inorganic oxide active nanofillers with high lithium ion conductivity and positive and negative active materials are respectively combined with a photosensitive polymer network matrix with a semi-interpenetrating structure to obtain a composite solid electrolyte with suitable rheological properties and photosensitive properties. The positive and negative electrode paste materials adopt light-curing 3D printing technology to realize the integrated 3D printing of solid-state lithium-ion batteries without degreasing, sintering and other post-processing processes. This technology can effectively reduce production cost and process cycle, and the prepared battery has good mechanical properties, especially the solid electrolyte and electrode use the same photosensitive polymer network as the matrix, and the cured electrode / electrolyte interface has good compatibility. It can effectively reduce the interfacial resistance to solve the interfacial compatibility and process compatibility between positive electrodes, negative electrodes, and solid electrolyte materials.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and more specifically relates to a method for preparing solid-state lithium-ion batteries (including organic-inorganic composite solid electrolytes and positive and negative electrodes) by photocuring 3D printing. Background technique [0002] As a new type of energy storage device, lithium-ion battery has the characteristics of high energy density, long cycle life, stable output voltage, less self-discharge and no pollution. Lithium-ion batteries are generally composed of positive and negative electrodes, separators and electrolytes. Electrolytes include: aqueous electrolytes, organic electrolytes, ionic liquid electrolytes and solid electrolytes. The electrolyte used in commercial lithium-ion batteries is usually an organic electrolyte, and in order to obtain better overall performance, a variety of organic solvents are generally used to dissolve ionic compounds. Most of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0585H01M10/0525H01M10/04B29C64/135B33Y10/00
CPCB33Y10/00B29C64/135H01M10/04H01M10/0525H01M10/0585Y02E60/10Y02P70/50
Inventor 魏璐郭新谢会信吴甲民陈双
Owner HUAZHONG UNIV OF SCI & TECH
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