Solid electrolyte material with low interface impedance and preparation method of solid electrolyte material

A solid electrolyte and interface impedance technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as reducing the interface impedance of electrolyte materials, and achieve the effects of avoiding damage, reducing interface impedance, and increasing battery impedance.

Inactive Publication Date: 2015-07-01
有研科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using LiI as the post-treatment material of the NASICON electrolyte material can reduce the interfacial impedance of the electrolyte material while participating in the transport of lithium ions. In theory, it can have a be

Method used

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  • Solid electrolyte material with low interface impedance and preparation method of solid electrolyte material
  • Solid electrolyte material with low interface impedance and preparation method of solid electrolyte material
  • Solid electrolyte material with low interface impedance and preparation method of solid electrolyte material

Examples

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Example Embodiment

[0035] Example 1

[0036] Take Li 1.5 Al 0.4 Ti 1.6 Si 0.1 P 2.9 O 12 Weigh the stoichiometric ratio of Li 2 CO 3 , Al(OH) 3 , SiO 2 , TiO 2 , NH 4 H 2 PO 4 , Preliminary mixing is carried out by planetary ball milling (ball milling speed: 500 rpm, ball milling mode: positive and negative alternately 0.1h, interval 0.2h, cycle 3 times), using Ar as carrier gas, heat treatment at 700℃ for 2h to remove volatile impurities. After grinding and crushing, it is placed in a Teflon tank and ball milled at 500 rpm for 20 hours (positive / reverse alternating, 1 hour each, 12 minutes apart). After taking it out, place the powder in a stainless steel mold with d=22mm, and form it by cold pressing at a pressure of 15-24 MPa (holding pressure 3min). Place the obtained sheet material in a muffle furnace at 900°C for 6h. The heating rate is 5°C / min. Take out the sample after high-temperature solid-phase reaction, soak it in 17.8% LiI (mass fraction) solution, and place it in a 50°C water bath fo...

Example Embodiment

[0037] Example 2

[0038] Take Li 1.4 Al 0.4 (Ge 0.2 Ti 0.8 ) 1.6 (PO 4 ) 3 Weigh the stoichiometric ratio of Li 2 CO 3 , Al(OH) 3 , GeO 2 , TiO 2 , NH 4 H 2 PO 4 , Preliminary mixing is carried out by planetary ball milling (ball milling speed: 500 rpm, ball milling mode: positive and negative alternately 0.1h, interval 0.2h, cycle 3 times), using Ar as carrier gas, heat treatment at 700℃ for 2h to remove volatile impurities. After grinding and crushing, it is placed in a Teflon tank and ball milled at 500 rpm for 20 hours (positive / reverse alternating, 1 hour each, 12 minutes apart). After taking it out, place the powder in a stainless steel mold with d=22mm, and form it by cold pressing at a pressure of 15-24 MPa (holding time 3min). Place the obtained sheet material in a muffle furnace at 850°C for 6h. The heating rate is 5°C / min. Take out the sample after high-temperature solid-phase reaction, soak it in 17.8% LiI (mass fraction) solution, and place it in a 50°C water bath ...

Example Embodiment

[0039] Example 3

[0040] Take Li 1.5 Al 0.4 Ti 1.6 Si 0.1 P 2.9 O 12 Weigh the stoichiometric ratio of Li 2 CO 3 , Al(OH) 3 , SiO 2 , TiO 2 , NH 4 H 2 PO 4 , Preliminary mixing is carried out by planetary ball milling (ball milling speed: 500 rpm, ball milling mode: positive and negative alternately 0.1h, interval 0.2h, cycle 3 times), using Ar as carrier gas, heat treatment at 700℃ for 2h to remove volatile impurities. After grinding and crushing, it is placed in a Teflon tank and ball milled at 500 rpm for 20 hours (positive / reverse alternating, 1 hour each, 12 minutes apart). After taking it out, place the powder in a stainless steel mold with d=22mm, and form it by cold pressing at a pressure of 15-24 MPa (holding pressure 3min). Place the obtained sheet material in a muffle furnace at 900°C for 6h. The heating rate is 5°C / min. Take out the sample after high temperature solid-phase reaction, soak it in saturated LiCl solution, and place it in a 50℃ water bath for 70h. Afte...

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Abstract

The invention discloses a solid electrolyte material with low interface impedance and a preparation method of the solid electrolyte material. The material comprises a major structure with a chemical formula Li1+x+yAlx(Ti,Ge)2-xSiyP3-yO12, and lithium iodide dispersed in the major structure, wherein the major structure of the material is an NASICON fast ion conductor; x is greater than 0 and less than or equal to 0.4; y is greater than 0 and less than or equal to 0.1; and the mass percentage a of lithium iodide in the material is greater than 0 and less than or equal to 10%. The preparation method of the material comprises the following steps of (1) synthesizing the major structure: selecting raw materials according to a stoichiometric equation of the solid electrolyte material and performing planet ball milling, cold pressing and a solid-phase reaction to obtain the major structure of the dense flaky solid electrolyte material, and (2) performing modification treatment: soaking a sample obtained in Step (1) in a lithium iodide aqueous solution, performing heating for some time, taking the sample out, cleaning the sample and performing vacuum drying treatment. According to the solid electrolyte material and the preparation method, a lithium iodide material with lithium ion conduction property is added to a solid electrolyte layer, so that the interface impedance is reduced, a three-dimensional ion conduction network is formed, and the ion conductivity is improved.

Description

technical field [0001] The invention relates to a solid electrolyte material with low interface impedance and a preparation method thereof, and belongs to the field of preparation of lithium ion conductive solid electrolytes. Background technique [0002] At present, the electrolyte used in lithium-ion batteries is usually a flammable liquid organic electrolyte, which brings about safety issues that need to be solved urgently for the large-scale application of lithium-ion batteries. The commonly used polymer electrolytes can alleviate the safety problems of lithium-ion batteries to a certain extent, but their low lithium-ion transport performance and low-temperature performance make it difficult to completely replace liquid electrolytes. All-solid-state lithium-ion batteries made of inorganic solid-state electrolyte materials can completely avoid battery safety problems caused by electrolyte leakage and battery abuse. Therefore, research on all-solid-state lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562Y02E60/10
Inventor 黄斌王建涛王耀谭翱卢世刚
Owner 有研科技集团有限公司
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