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A solid-state battery comprising an interface buffer layer and its preparation method

A solid-state battery and buffer layer technology, applied in secondary batteries, solid electrolytes, and secondary battery repair/maintenance, etc., can solve the development and application limitations of polymer solid-state lithium batteries, poor mechanical properties, and inability to long-term cycles. , to improve the cycle performance and practical value, inhibit the growth of lithium dendrites, and improve the ionic conductivity.

Active Publication Date: 2021-08-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer solid electrolytes have the advantages of good thermal stability, high stability to lithium, good cycle performance, and can be prepared into flexible thin film batteries; however, low ionic conductivity, poor electrode wettability, and low working power make The development and application of polymer solid-state lithium batteries are limited
Inorganic solid electrolytes have high ionic conductivity, wide electrochemical window, and good stability have attracted widespread attention. However, inorganic solid electrolytes are not easy to prepare, have poor interface contact, poor mechanical properties, and are sensitive to water and oxygen. application
[0004] At present, polymer solid-state electrolytes are the most promising solid-state electrolytes for practical production, mainly because polymer solid-state electrolytes have good processability, and the main bottleneck problems are low ionic conductivity and poor interface contact, which seriously hinder its practical application
In addition, due to the poor mechanical properties of polymer solid electrolytes, it is easy to cause lithium dendrites to puncture the electrolyte membrane and cause a short circuit, resulting in inability to cycle for a long time. Poor mechanical properties, poor interface properties

Method used

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  • A solid-state battery comprising an interface buffer layer and its preparation method
  • A solid-state battery comprising an interface buffer layer and its preparation method

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preparation example Construction

[0092]

[0093] As mentioned above, the present invention also provides a method for preparing the above-mentioned solid-state battery, the method comprising the following steps:

[0094] Step (S1): Dispersing the inorganic solid electrolyte in an organic solvent to obtain a mixed slurry, coating the obtained mixed slurry on the surfaces of the positive electrode sheet and the negative electrode sheet respectively, and drying to obtain the coated first inorganic solid electrolyte layer The positive electrode sheet and the negative electrode sheet coated with the second inorganic solid electrolyte layer;

[0095] Step (S2): dissolving oligomers of acrylate and its derivatives, lithium salts, plasticizers, thermal initiators, and small molecule additives in an organic solvent, stirring evenly to obtain a mixed system, and coating the mixed system on Step (S1) coating the positive electrode sheet of the first inorganic solid electrolyte layer and / or coating the surface of the n...

Embodiment 1

[0104] (1) 10g Li 7 La 3 Zr 2 o 12 Add it to 100mL acetonitrile solution, stir evenly, and coat a layer of Li on the surface of lithium cobaltate positive electrode and lithium negative electrode respectively 7 La 3 Zr 2 o 12 Inorganic solid electrolyte;

[0105] (2) Dissolve 0.2g of lithium hexafluorophosphate, 1.2g of polyethylene glycol methyl ether methacrylate, 0.2g of propylene carbonate, 0.4g of malononitrile and 0.004g of azobisisobutyronitrile in 10mL of acetonitrile In the solution, after stirring evenly, it is coated on the surface of the above-mentioned inorganic solid electrolyte to form a layer of interfacial buffer layer precursor;

[0106] (3) will be coated with Li respectively 7 La 3 Zr 2 o 12 The positive and negative electrodes of the inorganic solid electrolyte and the precursor of the interface buffer layer are laminated to form a battery cell, and then hot-pressed and polymerized at 80°C and 0.1MPa pressure for 6 hours.

Embodiment 2

[0108] (1) 15g Li 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 Add it to 100mL acetonitrile solution, stir evenly, and coat a layer of Li iron phosphate positive electrode sheet and graphite negative electrode sheet respectively. 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 Inorganic solid electrolyte;

[0109] (2) Dissolve 0.2g of lithium tetrafluoroborate, 0.8g of polyethylene glycol monoacrylate, 0.6g of ethylene carbonate, 0.4g of succinonitrile and 0.005g of azobisisoheptanonitrile in 10mL of acetonitrile In the solution, stir evenly and apply on the surface of the above-mentioned inorganic solid electrolyte to form a layer of interfacial buffer layer precursor;

[0110] (3) will be coated with Li respectively 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 The positive and negative electrodes of the inorganic solid electrolyte and the precursor of the interface buffer layer are laminated to form a battery cell, and then hot-pressed and polymerized at 60°C and 2MPa pressure for 6h.

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Abstract

The invention provides a solid-state battery including an interface buffer layer and a preparation method thereof. The solid-state battery includes a positive pole piece, a negative pole piece, a first inorganic solid electrolyte layer, a second inorganic solid electrolyte layer and an interface buffer layer; according to the positive pole piece, the first inorganic solid electrolyte layer, the interface buffer layer, the second inorganic The order of the solid electrolyte layer and the negative electrode sheet is assembled into a solid-state battery through a lamination process; the interface buffer layer after hot-press polymerization can eliminate the interface resistance between the inorganic solid electrolyte and the positive and negative electrodes, and at the same time improve the ionic conductivity of the inorganic solid electrolyte The efficiency significantly improves the interface performance of solid-state batteries, improves the cycle performance and practical value of batteries. The interface buffer layer has the characteristics of high mechanical strength and high ion conductivity, and the solid-state battery has the characteristics of large diffusion coefficient of lithium ions, which can inhibit the growth of lithium dendrites, stable structure, high conductivity, and high cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a solid-state battery including an interface buffer layer and a preparation method thereof. Background technique [0002] In the past few decades, liquid lithium-ion batteries have developed rapidly, and their energy density, cycle performance, safety, etc. have been greatly improved, making an indelible contribution to the development of contemporary technology and the improvement of people's living standards. Contribution, and this contribution will become more and more popular, more and more popular, and life-oriented. However, it is undeniable that the development of liquid lithium-ion batteries in recent years has been slower than before. People's pursuit of high energy density, long cycle performance, and high safety has caused a contradiction with the relatively slow development of lithium-ion liquid batteries. [0003] Since solid-state electrolytes can solve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/0585H01M10/42
CPCH01M10/0525H01M10/0562H01M10/0585H01M10/4235H01M2300/0068Y02E60/10Y02P70/50
Inventor 袁号李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD