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Solid-state battery based on plastic crystal modified positive electrode and preparation method of solid-state battery

A solid-state battery and positive electrode technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of insufficient battery performance, poor battery interface contact, low material conductivity, etc., and achieve positive electrode ion conductivity and Improved interface compatibility, ease of preparation and mass production, and high ionic conductivity

Active Publication Date: 2022-04-12
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of this application is to provide an improved interfacial compatibility and compatibility with high specific energy electrode materials in order to solve the technical problems in the prior art, and solve the problem of poor battery interface contact and low material conductivity. Fully exploiting the problem based on plastic crystal modified positive electrode solid-state battery and its preparation method

Method used

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  • Solid-state battery based on plastic crystal modified positive electrode and preparation method of solid-state battery
  • Solid-state battery based on plastic crystal modified positive electrode and preparation method of solid-state battery
  • Solid-state battery based on plastic crystal modified positive electrode and preparation method of solid-state battery

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Embodiment 1

[0044] 1. Preparation of plastic crystal modified positive electrode

[0045] 3.2g succinonitrile (SN), 0.9g lithium salt LiTFSI, 0.2g inorganic filler SiO 2 and 1.1g of polyethylene oxide (PEO) with a molecular weight of 10w were mixed and heated to 60°C for 0.5h to form a uniform plastic crystal-based composite positive electrode glue, and then 9gLiFePO was added to the above mixed solution 4 Stir with the SP mixture and 20ml DMAc for 6h to make it evenly mixed;

[0046] Add 0.46g monomer TMPTMA (polymer monomer) and 0.005g thermal initiator ABVN to the solution obtained in step a), stir at room temperature for 1 hour to obtain positive electrode slurry, apply it on aluminum foil, and heat at 70°C for 1 hour in situ polymerization , and then vacuum-dried at 80°C for 12 hours to dry the solvent;

[0047] Cut the positive electrode in b) into Φ12 discs, according to the ratio in steps a) and b), add succinonitrile (SN), lithium salt LiTFSI, monomer TMPTMA, initiator ABVN, in...

Embodiment 2

[0055] 1. Preparation of plastic crystal modified positive electrode

[0056] a) Mix 1.64g succinonitrile (SN) with 0.46g lithium salt LiTFSI, 0.1g inorganic filler Al 2 o 3 and 1.54g of PPC were mixed and heated to 60°C for 0.5h to form a uniform plastic crystal-based composite positive electrode glue, and then 9g of LiNi was added to the above mixed solution 0.85 co 0.1 Al 0.05 o 2 (NCA) was mixed with SP mixture and 25ml DMC for 6h to make it evenly mixed;

[0057] b) Add 0.24g of monomeric TPPTA and 0.003g of photoinitiator HMPP to the solution obtained in step a), stir at room temperature for 1h to obtain positive electrode slurry, apply it on aluminum foil, transfer it to a UV lamp for irradiation, and the intensity is 2000mW / cm 2 , the time is 20s, and then vacuum-dried at 70°C for 12h to remove the solvent;

[0058] c) Cut the positive electrode in b) into a disc of Φ12, according to the ratio in steps a) and b), succinonitrile (SN), lithium salt LiTFSI, monome...

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Abstract

The invention belongs to the technical field of solid-state batteries, and particularly relates to a solid-state battery based on a plastic crystal modified positive electrode and a preparation method thereof.The preparation method of the solid-state battery based on the plastic crystal modified positive electrode comprises the following steps that firstly, plastic crystal, lithium salt, a polymer and inorganic filler are heated and mixed, and the plastic crystal melted into a liquid state serves as a solvent; 2, mixing positive electrode material powder, a conductive agent, the plastic crystal-based composite positive electrode adhesive obtained in the step 1 and an organic solvent, and coating a current collector with the mixture; and 3, preparing a plastic crystal-based positive electrode surface treatment liquid, coating or spraying the plastic crystal-based positive electrode surface treatment liquid on the surface of the positive electrode layer obtained in the step 2, and carrying out in-situ polymerization by adopting heating or irradiation. According to the solid-state battery based on the plastic crystal modified positive electrode and the preparation method of the solid-state battery, the interface compatibility and the compatibility with a high-specific-energy electrode material are improved, and the problem that the battery performance cannot be brought into full play due to poor battery interface contact and low material conductivity is solved.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to a solid-state battery based on plastic crystal modified positive electrodes and a preparation method thereof. Background technique [0002] current technology: [0003] At present, commercial lithium-ion batteries still use organic electrolytes, which have great potential safety hazards and energy density bottlenecks. The solid-state battery obtained by replacing the electrolyte and diaphragm in the traditional liquid lithium-ion battery with a solid electrolyte completely avoids safety problems and simplifies the process. At the same time, a series of high-energy electrode materials can be applied in solid-state batteries, thereby improving the battery. Energy Density. [0004] However, the inventors of the present application have found that the above-mentioned prior art has at least the following technical problems: [0005] There are a series of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/0569H01M10/058
CPCY02E60/10Y02P70/50
Inventor 李杨徐志彬赵冬梅刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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