Interface layer and lithium ion battery comprising same

A lithium-ion battery, interface layer technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as lithium dendrite growth, avoid side reactions at the interface, high cycle stability and Coulomb efficiency, and inhibit the formation of and growth effects

Pending Publication Date: 2021-09-28
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve problems such as the growth of lithium dendrites between the existing solid electrolyte and the lithium metal negative electrode, the present invention provides an interface layer between the solid electrolyte and the lithium metal negative electrode and a lithium ion battery including the interface layer. The use of the interface layer can Improve the wettability of the interface between the solid electrolyte and the metal lithium negative electrode, and can improve the interface stability between the solid electrolyte and the metal lithium negative electrode, and can quickly conduct lithium ions and stably regulate the uniform deposition of metal lithium, so that the interface layer includes Lithium-ion batteries have good electrochemical performance and cycle stability

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  • Interface layer and lithium ion battery comprising same
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  • Interface layer and lithium ion battery comprising same

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preparation example Construction

[0041] As mentioned above, the present invention provides a kind of interface layer, here also provides the preparation method of above-mentioned interface layer, described method comprises the following steps:

[0042] 1) dissolving the metal halide in a solvent to form a precursor solution;

[0043] 2) Coating the precursor solution on one side of the solid electrolyte and drying in vacuum;

[0044] 3) attaching the metal lithium negative electrode to one side surface of the solid electrolyte coated with the precursor solution, reacting, and preparing the interface layer.

[0045] According to an embodiment of the present invention, in step 1), the solvent is selected from deionized water, methanol, ethanol, ether, acetone, ammonia water, hydrofluoric acid, tetrahydrofuran, dimethyl sulfoxide, chloroform, benzene, toluene and di at least one of toluene.

[0046] According to an embodiment of the present invention, in step 1), the definition of the metal halide is as above....

Embodiment 1

[0126] S1: put Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 The solid electrolyte powder is fully dried to remove the influence of trace moisture;

[0127] S2: put Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 The solid electrolyte powder is cold-pressed into thin sheets at 5 MPa, then sintered at 1000°C for 5 hours, and cooled to room temperature with the furnace;

[0128] S3: copper chloride CuCl 2 Dissolved in acetone to prepare a precursor solution with a ratio of 20wt%, and fully stirred at a speed of 500rpm for 10h to a homogeneous solution;

[0129] S4: Then the CuCl in S3 2 The precursor solution was evenly scraped on the Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 The upper surface of the solid electrolyte sheet is fully vacuum-dried at 30°C for 12 hours to form a thin film layer;

[0130] S5: Heat metal lithium to 190°C to make it into a molten state, and then evenly coat the Li treated in S4 6.6 La 3 Zr 1.6 Ta 0.4 o 12 On the upper surface of the solid electrolyte sheet, the interface ...

Embodiment 2

[0138] S1: put Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 The solid electrolyte powder is fully dried to remove the influence of trace moisture;

[0139] S2: put Li 1.5 Al 0.5 Ti1.5 (PO 4 ) 3 The solid electrolyte powder is cold-pressed into thin sheets at 4MPa, then sintered at 850°C for 8h, and cooled to room temperature with the furnace;

[0140] S3: nickel bromide NiBr 2 Dissolved in methanol to prepare a precursor solution with a ratio of 8wt%, and fully stirred at a speed of 700rpm for 6h to a homogeneous solution;

[0141] S4: Then the NiBr in S3 2 The precursor solution was evenly spin-coated on the Li 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 The upper surface of the solid electrolyte sheet is spin-coated at a rotational speed of 1000rpm. After the spin-coating is completed, it is fully vacuum-dried at 50°C for 10h to form a thin film layer;

[0142] S5: Heat metallic lithium to 200°C to make it into a molten state, and then evenly coat the Li treated in S4 1.5 al 0.5 Ti 1.5...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an interface layer and a lithium ion battery comprising the interface layer. Lithium halide generated by the in-situ reaction at the interface of a solid electrolyte and a metal lithium negative electrode can optimize the interface contact property and the interface wettability and provide a rapid ion diffusion path. The metal particles generated by the in-situ reaction at the interface of the solid electrolyte and the metal lithium negative electrode can guide the uniform distribution of an electric field, regulate and control the uniform deposition of the metal lithium in the circulation process, and inhibit the formation and growth of lithium dendrites. The lithium ion battery provided by the invention can effectively stabilize the interface between the electrode and the electrolyte, reduces the chemical reaction activity of the metal lithium negative electrode, avoids the side reaction at the interface, and shows higher cycling stability and coulombic efficiency in continuous charge-discharge cycles.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an interface layer between a solid electrolyte and a metal lithium negative electrode and a lithium ion battery including the interface layer. Background technique [0002] Lithium-ion batteries have many excellent properties such as small size, light weight, high specific energy, no pollution, small self-discharge, and long life, so they have achieved rapid development in the fields of notebooks, mobile phones, and digital products. Nowadays, the application of high-energy density and high-power lithium-ion batteries in the field of new energy vehicles is becoming a core technology, but at the same time, there are higher requirements for the structure and performance of lithium-ion batteries. The positive and negative electrodes in lithium-ion batteries Materials face new challenges. [0003] At present, the industrial lithium-ion battery with graphite as the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/628H01M10/0525Y02E60/10
Inventor 张赵帅赵伟李素丽唐伟超董德锐
Owner ZHUHAI COSMX BATTERY CO LTD
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