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Solid electrolyte ceramic material with symmetrical gradient pore structure and its preparation method and application

A technology of solid electrolyte and ceramic materials, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of large thickness of solid electrolyte layer, low lithium ion conductivity, and excessive internal resistance of batteries, so as to improve discharge capacity and Rate capability, increased deposition amount, small thickness effect

Active Publication Date: 2020-10-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of low lithium ion conductivity of the existing solid electrolyte material, large thickness of the solid electrolyte layer, and excessive internal resistance of the battery, and provides a solid electrolyte ceramic material and its preparation method and application

Method used

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  • Solid electrolyte ceramic material with symmetrical gradient pore structure and its preparation method and application
  • Solid electrolyte ceramic material with symmetrical gradient pore structure and its preparation method and application
  • Solid electrolyte ceramic material with symmetrical gradient pore structure and its preparation method and application

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specific Embodiment approach 1

[0049] Embodiment 1: The solid electrolyte ceramic material with a symmetrical gradient pore structure in this embodiment is Li 7- x La 3 Zr 2-x N x o 12 , Li 7 La 3 Zr 2 o 12 , Li 2 ATi 3 o 8 or Li 1+x m x Ti 2-x (PO 4 ) 3 ; where Li 7-x La 3 Zr 2-x N x o 12 where 0≤x≤1.2, N is Al, Ta, Ge or Nb; Li 2 ATi 3 o 8 In A is Zn, Mg or Co; Li 1+x m x Ti 2-x (PO 4 ) 3 where 0≤x≤0.5, M is Al, Ga, In or Sc;

[0050] The solid electrolyte ceramic material includes a three-layer structure, with a dense layer in the middle and porous layers on both sides. The pore diameters of the porous layer are arranged in a gradient, and the pore diameters increase sequentially along the direction away from the dense layer, forming gradually changing gradient pores in the porous layer. structure.

[0051] In this embodiment, the solid electrolyte is etched with acids in different proportions to prepare a three-layer ceramic with a dense layer in the middle and porous layer...

specific Embodiment approach 2

[0053] Embodiment 2: This embodiment is different from Embodiment 1 in that: the thickness of the dense layer is 10 μm-100 μm, and the thickness of the porous layer is 100 μm-400 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0054] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the density of the dense layer is greater than 90%. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a solid electrolyte ceramic material with symmetrical gradient pore structure and a preparation method and application thereof, and relates to a solid electrolyte ceramic material and a preparation method and application thereof. The material aims at solving the problems of low conductivity, large thickness of the solid electrolyte layer and excessive internal resistance ofthe battery of the existing solid electrolyte material lithium. The solid electrolyte ceramic material comprises a three-layer structure, wherein the middle is a dense layer, the two sides are porouslayers. The pore diameters of the porous layers are arranged in gradient. The apertures of the pores are sequentially increased along the direction away from the dense layer. A graded pore structurein which the pores are gradually changed are formed on the porous layer. The preparation method comprises the following steps: 1, preparing powder by using solid-phase sintering, gel-sol and glycinecombustion or coprecipitation methods; 2, preparing electrolyte; 3, preparing a dense electrolyte sheet; 4, acid etching; 5, uniformly depositing an electron conducting layer on one surface of the three-layer structure ceramic to obtain the solid electrolyte ceramic material of the three-layer structure. The method is used in the field of ceramic materials.

Description

technical field [0001] The invention relates to a solid electrolyte ceramic material and its preparation method and application. Background technique [0002] Lithium-air batteries have a theoretical energy density much higher than that of lithium-ion batteries, and now they have become synonymous with a new generation of high specific energy mobile power sources. At present, most of the portable devices used in people's life and work, such as personal computers, smart phones, ipads, etc., are powered by lithium-ion batteries. However, in the field of electric vehicles, the current lithium-ion batteries are far from meeting the needs of energy density. Relevant data shows that in order to achieve commercialization of electric vehicles, the battery energy density needs to reach 250W h / kg, but the energy density of lithium-ion power battery cells produced by current battery manufacturers is only 165-180W h / kg. When a single battery constitutes a system, the addition of other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562Y02E60/10
Inventor 朱星宝杨田王宇黄喜强姬鑫吴元果潘星宇吕喆
Owner HARBIN INST OF TECH
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