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Negative plate for all-solid-state battery and preparation method and application thereof

A technology of all-solid-state batteries and negative plates, applied in battery electrodes, lithium batteries, electrode carriers/collectors, etc., can solve the problems of high deposition local stress and uneven surface of negative lithium sheets, so as to maintain uniformity and prevent impact The effect of crushing and maintaining stress balance

Inactive Publication Date: 2020-04-10
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a negative electrode plate for all-solid-state batteries and its preparation method and application, the negative electrode plate includes a lithium material layer and a metal current collector skeleton layer, and the internal gap of the metal current collector skeleton layer is embedded with elastic material, the lithium material layer and the metal current collector skeleton layer contain a bonding layer; the use of the negative plate of the present invention can solve the local stress caused by the uneven deposition and dissolution of the negative electrode lithium sheet surface during the charging and discharging process of the solid-state battery Excessively high problem to prolong battery life

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  • Negative plate for all-solid-state battery and preparation method and application thereof
  • Negative plate for all-solid-state battery and preparation method and application thereof
  • Negative plate for all-solid-state battery and preparation method and application thereof

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Embodiment 1

[0057] The negative electrode plate for an all-solid-state battery of the present invention comprises a metal lithium layer and a metal current collector framework layer. The internal gap of the metal current collector framework layer is inlaid with an elastic material; wherein the thickness of the metal lithium layer is 100 μm, and the metal collector The thickness of the fluid framework layer is 1000 μm, the material of the metal collector framework is nickel foam; the porosity of the nickel foam is 40%, the elastic material is cis 1,4-polybutadiene; the elastic modulus of the elastic material It is 5MPa and Poisson's ratio is 0.48.

[0058] The preparation method of the negative plate:

[0059] (a) Melt the elastic material powder, and then inject it into the nickel foam by injection molding at a temperature of 90°C to obtain a composite membrane material;

[0060] (b) The metal lithium layer is hot pressed on the surface of the composite film material obtained in step (a) under ...

Embodiment 2

[0062] The negative electrode plate for the all-solid-state battery of the present invention comprises a metal lithium layer and a metal current collector framework layer. The internal gap of the metal current collector framework layer is inlaid with an elastic material; wherein the thickness of the metal lithium layer is 50 μm, and the metal collection The thickness of the fluid skeleton layer is 500 μm, the material of the metal current collector skeleton is foamed nickel; the porosity of the foamed nickel is 40%, the elastic material is ethylene propylene copolymer; the elastic modulus of the elastic material is 8MPa, Poisson The ratio is 0.52.

[0063] The preparation method of the negative plate:

[0064] (a) Melt the elastic material powder, and then infiltrate into the foamed nickel by injection molding at a temperature of 110°C to obtain a composite membrane material;

[0065] (b) The metal lithium layer is hot-pressed on the surface of the composite film material obtained i...

Embodiment 3

[0067] The negative electrode plate for an all-solid-state battery of the present invention comprises a lithium alloy layer and a metal current collector framework layer. The internal gap of the metal current collector framework layer is inlaid with an elastic material; wherein the thickness of the lithium alloy layer is 20 μm, and the metal collector The thickness of the fluid skeleton layer is 50μm, the material of the metal current collector skeleton is nickel foam; the porosity of the nickel foam is 30%, the elastic material is polyisobutylene; the elastic modulus of the elastic material is 10MPa, and the Poisson's ratio is 0.54.

[0068] The preparation method of the negative plate:

[0069] (a) Melt the elastic material powder, and then infiltrate into the foamed nickel by injection molding at a temperature of 200°C to obtain a composite membrane material;

[0070] (b) Hot-pressing the lithium alloy layer on the surface of the composite film material obtained in step (a) at a ...

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Abstract

The invention relates to a negative plate for an all-solid-state battery as well as a preparation method and application of the negative plate. The negative plate comprises a lithium material layer and a metal current collector skeleton layer; an elastic material is embedded in an internal gap of the metal current collector skeleton layer; a bonding layer is arranged between the lithium material layer and the metal current collector skeleton layer. By adopting the structure, firstly, the negative plate can keep stress balance at different positions of the negative plate, so that the problem ofoverhigh local stress caused by uneven deposition and dissolution of the surface of the negative lithium plate in the charging and discharging process of the solid-state battery is solved; secondly,different positions of the metal current collector skeleton layer of which the internal gap is embedded with the elastic material in the negative plate can generate deformation with different sizes, so that the negative plate has different resilience forces, and the uniformity of interface contact between the negative lithium plate and the solid electrolyte is favorably maintained; and thirdly, the elastic buffer effect can be improved, so that the solid electrolyte is prevented from being impacted and broken.

Description

Technical field [0001] The invention belongs to the field of solid-state batteries, and relates to a negative electrode plate for an all-solid-state battery, and a preparation method and application thereof. Background technique [0002] Compared with lithium-ion batteries with liquid electrolytes, all-solid-state lithium batteries have become a research focus in recent years due to their higher energy density and excellent safety performance. However, since the solid electrolyte replaces the liquid electrolyte, the contact interface between the electrode material and the electrolyte has changed from a solid-liquid interface to a solid-solid interface. How to solve the interface contact problem between lithium metal and solid electrolyte is the most challenging for solid-state lithium batteries One of the most difficult scientific problems. [0003] The solid-solid contact interface has some point-to-point contact states. The huge volume expansion of the electrode during charging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M4/661H01M4/665H01M4/808H01M10/052Y02E60/10
Inventor 谭强强王鹏飞娄平平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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