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Solid-state lithium battery and electrode-diaphragm layer interface improvement method and application thereof

A technology of solid lithium and diaphragm layer, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, etc. It can solve the problems of mismatched electrochemical activity, poor battery performance, and hindered ion transmission, etc., so as to improve battery capacity retention efficiency, improved cycle stability, and excellent transmission performance

Inactive Publication Date: 2021-01-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because the electrodes and electrolytes used in solid-state batteries are solid materials, the contact mode between them is solid-solid contact, the contact area is limited, ion transmission is hindered, and the battery performance is poor.
Chinese patent CN 103247823B describes an all-solid-state battery with a lithium zirconate lanthanum electrolyte system. The interface between the electrode and the electrolyte of the battery system is a simple solid-solid contact. The battery has a low discharge capacity in the first week and a low cycle retention rate. The battery can only run for 15 weeks. about
Compared with inorganic solid electrolytes, polymer solid electrolytes have a lower Young's modulus and higher flexibility, which can better improve the physical contact between the electrolyte and the electrode interface. However, the interface between the polymer electrolyte system and the electrode is prone to exist. The problem of electrochemical activity mismatch, taking the most mature polymer solid-state battery-polyethylene oxide (PEO) solid-state battery system as an example, due to the narrow electrochemical window of polyethylene oxide, the oxidation potential is generally lower than 4.0V , so that the all-solid-state battery of this system can only match active materials such as lithium iron phosphate on the low-voltage platform, which greatly limits the energy density of the solid-state battery of this system
Chinese patent CN105591154B describes a polycarbonate-based all-solid-state polymer electrolyte, which has the advantage of wide electrochemical window and can better match the metal lithium negative electrode with high voltage (>4.0V), but its film-forming property is poor, and it is difficult to separate Film formation must be used in combination with porous support materials, which reduces the energy density of the battery. Moreover, due to the poor flexibility of polycarbonate polymer chain segments, it is difficult to assemble solid-state batteries directly using polycarbonate polymer composite films. Poor contact, poor kinetic performance of the battery, unable to make good use of the capacity of positive and negative active materials

Method used

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  • Solid-state lithium battery and electrode-diaphragm layer interface improvement method and application thereof
  • Solid-state lithium battery and electrode-diaphragm layer interface improvement method and application thereof
  • Solid-state lithium battery and electrode-diaphragm layer interface improvement method and application thereof

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Embodiment 1

[0076]In this embodiment, polyvinylene carbonate is used to modify the lithium cobalt oxide pole piece to prepare a polyethylene oxide (PEO)-based polymer solid-state lithium battery.

[0077]1. Take 3.5 g of LiTFSI, dissolve it in 30 ml of VC, and add 10 mg of AIBN to prepare a precursor solution for later use;

[0078]2. According to the mass ratio of lithium cobaltate (LCO), polyvinylidene fluoride (PVDF), and super P, the mass ratio is 8:1:1, and the raw materials are dissolved in N-methylpyrrolidone (NMP), stirred into a slurry, and passed Coating, punching, weighing, drying, etc., prepare an untreated positive pole piece with a diameter of 12 mm, and transfer it to the glove box for later use;

[0079]3. According to the EO:Li ratio of 18, a PEO-LiTFSI polymer solid electrolyte membrane with a diameter of 16.2 mm and a thickness of 200 microns was prepared according to the solution casting method, for use;

[0080]4. In a glove box filled with high-purity argon, add 20 microliters of the ...

Embodiment 2

[0084]In this embodiment, polyvinyl ethylene carbonate is used to modify lithium nickel cobalt manganate pole pieces to prepare a polyacrylonitrile (PAN)-based polymer system all-solid battery.

[0085]1. Take 3.5 g of LiDFOB, dissolve it in 200 ml of ethylene ethylene carbonate, add 20 mg of BPO to prepare a precursor solution for later use;

[0086]2. According to the mass ratio of nickel cobalt manganate (NCM622), polyvinylidene fluoride (PVDF), and super P at a mass ratio of 8:1:1, dissolve the raw materials in N-methylpyrrolidone (NMP) and stir to form a slurry , Through the processes of coating, punching, weighing, drying, etc., an untreated positive pole piece with a diameter of 12 mm is prepared and transferred to the glove box for later use;

[0087]3. According to the N:Li ratio of 18, PAN-LiClO with a diameter of 16.2 mm and a thickness of 300 microns was prepared according to the solution casting method4Polymer solid electrolyte membrane, spare;

[0088]4. In a glove box filled with...

Embodiment 3

[0091]In this embodiment, polymethyl methacrylate is used to modify lithium cobalt oxide pole pieces to prepare an inorganic system all-solid-state battery.

[0092]1. Take 3.5 g of LiTFSI, dissolve it in 30 ml of methyl methacrylate, and add 10 mg of AIBN to prepare a precursor solution for later use;

[0093]2. According to the mass ratio of lithium cobaltate (LCO), polyvinylidene fluoride (PVDF), and super P, the mass ratio is 8:1:1, and the raw materials are dissolved in N-methylpyrrolidone (NMP), stirred into a slurry, and passed Coating, punching, weighing, drying, etc., prepare an untreated positive pole piece with a diameter of 12 mm, and transfer it to the glove box for use;

[0094]3. Prepare a lithium lanthanum zirconium oxide (LLZO) solid electrolyte sheet with a diameter of 16.2 mm and a thickness of 200 mm according to the hot pressing method, for use;

[0095]4. In a glove box filled with high-purity argon gas, take 20 microliters of the precursor solution and drop it on the posi...

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Abstract

The embodiment of the invention relates to a solid-state lithium battery as well as an electrode-diaphragm layer interface improvement method and application thereof. The solid-state lithium battery comprises a positive electrode, diaphragm layers, a negative electrode and polyester polymer solid electrolyte layers constructed between the positive electrode diaphragm layers and / or between the negative electrode diaphragm layers, wherein the polyester polymer solid electrolyte layer comprises a polyester polymer, a lithium salt and an initiator; the lithium salt and the initiator account for 5%-80% of the total mass of the polyester polymer solid electrolyte layer; the positive electrode and / or the negative electrode also comprise / comprises the polyester polymer solid electrolyte layer introduced by curing.

Description

Technical field[0001]The present invention relates to the technical field of solid-state batteries, in particular to a solid-state lithium battery and a method and application for improving the interface of its electrode-diaphragm layer.Background technique[0002]The successful commercial application of lithium-ion batteries has driven the rapid development of industries including smart phones, wearable devices, drones, and electric vehicles. However, in recent years, the energy density of lithium-ion batteries is getting closer to its theoretical limit, and it has been difficult to meet the increasing demands of people and society for energy storage systems; at the same time, because lithium-ion battery technology has become more popular in electric vehicles and other fields Widely used, the safety problem of battery technology is more severe.[0003]Solid-state lithium battery is a kind of lithium battery that uses solid electrode materials and solid electrolyte materials, and basica...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 卢嘉泽李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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