All-solid-state battery with low interface impedance and high interface compatibility

An all-solid-state battery and compatibility technology, applied in the field of lithium-ion batteries, can solve the problems of reducing interface impedance and the inability to apply high-melting point solid electrolytes, etc., to achieve the effect of reducing electrochemical impedance and improving cycle performance

Active Publication Date: 2020-05-01
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for solid electrolytes with low melting points, and cannot be applied to high melting point solid electrolytes such as LLZO and other inorganic solid electrolytes.
In addition, the publication number CN107342439A proposes to inject an ester solvent into the assembled solid-state battery to infiltrate it between the positive electrode sheet and the electrolyte membrane group and between the negative electrode sheet and the electrolyte membrane group, and use hot pressing The above-mentioned battery is hot-pressed to reduce the interface impedance. This method can reduce the interface impedance to a certain extent, but the lipid solvent is a liquid organic substance. Once it is added, it does not belong to an all-solid-state battery. It also has a similar safety to an organic electrolyte to a certain extent question

Method used

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  • All-solid-state battery with low interface impedance and high interface compatibility
  • All-solid-state battery with low interface impedance and high interface compatibility
  • All-solid-state battery with low interface impedance and high interface compatibility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] figure 1 It is a schematic diagram of the present invention coated fast ion conductor positive and negative electrode composite materials, 1 is an intermittent coating composite material, and 2 is a continuous coating composite material.

[0048] figure 2 It is a schematic diagram of the structure of the all-solid-state battery of the present invention. In the figure, 3 is a positive electrode current collector, 4 is a solid electrolyte, 5 is a positive electrode active material, 6 is a low-melting organic polymer solid electrolyte, 7 is a negative electrode active material, and 8 is a negative electrode current collector. 9 is a fast ion conductor.

[0049] Composite positive electrode preparation: choose LiNi coated with 2wt% LLZO 0.6 co 0.2 mn 0.2 o 2 (NCM622-LLZO) is the positive active material, LLZO is the solid electrolyte, PVDF is the positive binder, Super P is the positive conductor, Li 2 Zr 3 as a fast ion conductor. Among them, (NCM622-LLZO+LLZO): ...

Embodiment 2

[0059] Composite cathode preparation: xLi coated with 5wt% LATP 2 MnO 3 ·(1-x)LiMO 2 The active material (LMO-LATP) is the positive electrode active material, LATP is the solid electrolyte, PVDF is the positive electrode binder, Super P positive electrode conductor, and LiTFSI is the fast ion conductor. Among them, (LMO-LATP+LATP): PVDF: Super P: LiTFSI = 94: 2.5: 2.5: 1, after the slurry is mixed, it is prepared into a composite positive electrode sheet, and the composite positive electrode sheet is coated on both sides;

[0060] Among them, the ratio of LMO-LATP to LATP is set to five gradients of I, II, III, IV, and V, and the specific ratios are as follows:

[0061] Numbering LMO-LATPwt% LATPwt% Ⅰ 95 5 Ⅱ 90 10 Ⅲ 80 20 Ⅳ 60 40 Ⅴ 0 100

[0062] First, the active material numbered Ⅰ is coated on the current collector with a coating thickness of 30 μm, and then the numbered Ⅱ, Ⅲ, Ⅳ, and Ⅴ active material layers are coated in s...

Embodiment 3

[0069] Composite cathode preparation: LiNi coated with 3wt% LLTO 1.5 mn 0.5 o 4 (LNMO-LLTO) The positive electrode active material is the positive electrode active material, LLTO is the solid electrolyte, PVDF is the positive electrode binder, Super P positive electrode conductive agent, LiPF 6 as a fast ion conductor. Among them, (LNMO-LLTO+LLTO): PVDF: Super P: LiPF 6 =94:2:2:2, after mixing the slurry, prepare a composite positive electrode sheet, and the composite positive electrode sheet is coated on both sides;

[0070] Among them, the ratio of LMO-LATP to LATP is set to four gradients of I, II, III, and IV, and the specific ratios are as follows:

[0071] Numbering LNMO-LLTOwt% LLTOwt% Ⅰ 92 8 Ⅱ 85 15 Ⅲ 65 35 Ⅳ 0 100

[0072] First, the active material numbered Ⅰ is coated on the current collector with a coating thickness of 40 μm, and then the numbered Ⅱ, Ⅲ, Ⅳ, and Ⅴ active material layers are coated in sequence, with a thi...

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Abstract

The invention provides an all-solid-state lithium ion battery with low interface impedance and high compatibility. The battery comprises a composite positive pole piece and a composite negative pole piece, wherein the composite positive plate and the composite negative plate are a mixture of an active substance and solid electrolyte with a certain concentration gradient, the concentration gradientis that the concentration of the active substance is gradually reduced from a current collector to the outside, the solid electrolyte is gradually increased, and the outermost layer is only a solid electrolyte layer. In order to achieve interfacial compatibility of the positive and negative composite pole pieces, a surface of the outermost solid electrolyte layer of the composite pole piece is designed into a concave-convex groove, and the concave-convex surface is coated with low-melting polymer solid electrolyte; and lastly, the composite positive pole piece and the composite negative polepiece are tightly combined in a hot-pressing manner to assemble the battery. The battery can effectively solve a problem of compatibility between an electrode material and an electrolyte layer and a problem of large interface impedance of a solid-state battery, and thereby the cycling stability of the solid-state battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to the field of preparation methods for all-solid-state batteries with low interfacial impedance and high interfacial compatibility. Background technique [0002] In recent years, with the increasing demand for energy density of lithium-ion batteries in the market, all-solid-state batteries have become a research hotspot due to their wide electrochemical window. The inorganic all-solid-state electrolyte is granular and in solid contact with the active material, resulting in a large interface impedance of the battery, which has become a key technical bottleneck for the development of inorganic all-solid-state lithium-ion batteries. [0003] Aiming at this bottleneck, Publication No. CN107240718A proposes to add a solid electrolyte to the positive and negative active materials, and then heat at a high temperature to melt the solid electrolyte to reduce the interfacial impedance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M10/058
CPCH01M10/058H01M10/0525H01M10/0565Y02E60/10Y02P70/50
Inventor 刘建红刘贵娟王兴勤张阳
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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