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All-solid-state battery and preparation method thereof

An all-solid-state battery and solid-state electrolyte technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc. Electrochemical performance, improved interfacial compatibility, good viscosity effect

Active Publication Date: 2022-03-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer solid electrolytes have excellent properties such as good flexibility and easy processing, but the disadvantages of low conductivity, high operating temperature and low electrochemical window limit the application of polymer electrolytes in solid-state lithium batteries.
Since solid-state batteries use solid-state electrolytes, there are problems of large interface resistance and poor interface compatibility, and during the cycle of solid-state batteries, solid-state electrolytes may undergo redox reactions with lithium negative electrodes, which will generate high-impedance interface phases and accumulate on the negative electrodes. Between the solid electrolyte and the lithium ion transmission
These issues seriously affect the rate performance of solid-state batteries

Method used

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  • All-solid-state battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] (1) Preparation of interface layer precursor solution: in a glove box filled with argon, 1 g of polyethylene carbonate (PEC) and lithium salt LiTFSI (mole fraction 60 mol%) were dissolved in 4 mL of acetonitrile, stirred and dissolved to obtain a clear interface layer precursor solution;

[0029] (2) To assemble the battery, 150mg Li 10 GeP 2 S 12 The ceramic sheet pressed into a sheet is used as the electrolyte sheet. After the electrolyte sheet and the two electrodes are assembled, they are soaked in the above interface layer precursor solution, and the solvent is dried in a glove box at 85°C to form an interface layer in situ.

[0030] The all-solid-state lithium symmetric battery prepared in this example includes a sandwich structure consisting of a positive electrode 4, an inorganic solid electrolyte 3, and a negative electrode 1, and an interface layer 2 is provided at the interlayer interface of the sandwich structure, and the interface layer 2 is a continuous ...

Embodiment 2

[0032] (1) Preparation of interfacial layer precursor solution: in a glove box filled with argon, 1 g of polyethylene carbonate (PEC) and lithium salt LiTFSI (mole fraction 80 mol%) were dissolved in 4 mL of acetonitrile, stirred and dissolved to obtain a clear interface layer precursor solution;

[0033] (2) To assemble the battery, 150mg Li 10 GeP 2 S 12 The ceramic sheet pressed into a sheet is used as the electrolyte sheet. After the electrolyte sheet and the two electrodes are assembled, they are soaked in the above interface layer precursor solution, and the solvent is dried in a glove box at 85°C to form an interface layer in situ.

Embodiment 3

[0035] (1) Preparation of interface layer precursor solution: in a glove box filled with argon, 1 g of polyethylene carbonate (PEC) and lithium salt LiTFSI (mole fraction 100 mol%) were dissolved in 4 mL of acetonitrile, stirred and dissolved to obtain a clear interface layer precursor solution;

[0036] (2) To assemble the battery, 150mg Li 10 GeP 2 S 12 The ceramic sheet pressed into a sheet is used as the electrolyte sheet. After the electrolyte sheet and the two electrodes are assembled, they are soaked in the above interface layer precursor solution, and the solvent is dried in a glove box at 85°C to form an interface layer in situ.

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Abstract

The invention discloses an all-solid-state battery and a preparation method thereof, the battery comprises a positive electrode, a negative electrode, a solid electrolyte and an interface layer, and the interface layer is obtained by an in-situ method. The preparation method comprises the following steps: firstly, obtaining an inorganic solid electrolyte sheet by using a tabletting method, then assembling the inorganic solid electrolyte sheet and two electrodes into a sandwich structure through cold pressing lamination, and soaking the whole assembled battery into an interface layer precursor solution to form a thin interface layer in situ. The method for preparing the interface layer in situ can ensure that the whole battery system is not separated, so that the electrolyte and the surface of the pole piece are fully fused, the interface compatibility of the pole piece and the electrolyte is improved, a continuous ion conduction channel is formed, direct contact between the lithium negative electrode and the solid electrolyte is avoided, and the electrochemical performance of the solid-state battery is improved; and the long-time circulation of the battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state battery new energy, and in particular relates to an all-solid-state battery and a preparation method thereof. Background technique [0002] With the development of new technology, lithium-ion batteries have been widely used in the fields of communication, power, and digital products. Secondary batteries with high safety and high energy density are the future development direction, while traditional lithium-ion batteries are due to liquid The presence of electrolyte will lead to certain safety problems in the battery. Solid electrolyte (SE) has the advantages of thermal stability, non-flammability, no leakage and no volatilization. Solid-state batteries greatly reduce the content of solvents, and they have a higher thermal runaway initiation temperature, which greatly improves the battery life during use. Stability and security. [0003] Solid electrolytes are the main materials researche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0525H01M10/42
CPCH01M10/058H01M10/0562H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 赵金保曾月劲李睿洋张鹏
Owner XIAMEN UNIV
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