A kind of lanthanum lithium zirconate solid electrolyte and preparation method thereof

A technology of solid electrolyte, lanthanum lithium zirconate, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problem of low ionic conductivity of solid electrolytes, shorten the sintering reaction time, improve ionic conductivity, and relatively The effect of high density

Active Publication Date: 2022-04-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of low ion conductivity of lanthanum lithium zirconate solid electrolyte

Method used

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  • A kind of lanthanum lithium zirconate solid electrolyte and preparation method thereof
  • A kind of lanthanum lithium zirconate solid electrolyte and preparation method thereof
  • A kind of lanthanum lithium zirconate solid electrolyte and preparation method thereof

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preparation example Construction

[0034] combine figure 1 As shown, the embodiment of the present invention provides a method for preparing a lithium lanthanum zirconate solid electrolyte, comprising the following steps:

[0035] Step S1, respectively preparing lithium lanthanum zirconate powder and lithium germanate powder;

[0036] Step S2, coating the lithium germanate powder on the surface of the lithium lanthanum zirconate powder to obtain a composite powder;

[0037] Step S3, pre-pressing and cold isostatic pressing the composite powder to obtain a ceramic green body, and liquid-phase sintering the ceramic green body to obtain a lithium lanthanum zirconate solid electrolyte.

[0038] Since the traditional pressureless sintering method requires a higher sintering temperature and a longer sintering time, a large amount of lithium elements are volatilized, which not only reduces the concentration of lithium ions inside the electrolyte, but also reduces the relative density of the electrolyte. A small amount...

Embodiment 1

[0069] This embodiment provides a method for preparing a lithium lanthanum zirconate solid electrolyte, comprising the following steps:

[0070] 1.1 In parts by weight, weigh 25 parts of Li 2 CO 3 , 45 La 2 o 3 , 18 parts of ZrO 2 and 12 Ta 2 o 5 , will Li 2 CO 3 , La 2 o 3 , ZrO 2 and Ta 2 o 5 After mixing evenly, the mixed powder is obtained, and the mixed powder is added to the ball milling tank, and the grinding ball is added to the ball milling tank according to the mass ratio of the mixed powder and the grinding ball as 1:3, and the mass ratio of isopropanol to the mixed powder is 1.5 : 1, add isopropanol in the ball mill jar, after the ball mill jar is sealed, at a rotating speed of 400r / min, ball mill for 12h, after the balls are removed, the first slurry is obtained, and the first slurry is passed through a 300-mesh screen After filtering, dry at 60°C for 12 hours to obtain evenly mixed raw material mixed powder; put the raw material mixed powder into a c...

Embodiment 2

[0076] This example provides a method for preparing a lithium lanthanum zirconate solid electrolyte. The preparation method in this example is the same as that in Example 1, with the difference that:

[0077] When preparing lithium germanate powder, according to Li 2 CO 3 and GeO 2 The molar ratio of Li is 60:40 2 CO 3 and GeO 2 Mix evenly to obtain lithium germanate powder (ie 0.6Li 2 O-0.4GeO 2 ).

[0078] When preparing the composite powder, according to the following parts by weight: 96 parts of lithium lanthanum zirconate powder and 4 parts of lithium germanate powder, the lithium lanthanum zirconate powder and lithium germanate powder were evenly mixed to prepare the composite powder.

[0079] When preparing the lanthanum lithium zirconate solid electrolyte, the ceramic green body was raised from normal temperature to 1000 °C at a heating rate of 5 °C / min, and then the ceramic green body was raised from 1000 °C to 1120 °C at a heating rate of 3 °C / min, and sintere...

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Abstract

The invention provides a lanthanum lithium zirconate solid electrolyte and a preparation method thereof, comprising the following steps: step S1, preparing lanthanum lithium zirconate powder and lithium germanate powder respectively; step S2, coating the surface of the lanthanum lithium zirconate powder Covering the lithium germanate powder to obtain a composite powder; step S3, subjecting the composite powder to pre-pressing and cold isostatic pressing to obtain a ceramic green body, and sintering the ceramic green body in liquid phase to obtain Lithium lanthanum zirconate solid electrolyte. The present invention reduces the volatilization of lithium ions during the sintering process and simultaneously reduces the grain boundary resistance and intrinsic resistance, thereby achieving the purpose of greatly improving the ion conductivity of the lithium lanthanum zirconate solid electrolyte.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials, in particular to a method for preparing a lithium lanthanum zirconate solid electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in small electronic devices and electric vehicles due to their advantages such as large specific capacity, high specific energy, small self-discharge, long cycle life, no memory effect, small size, and light weight. All-solid-state lithium batteries use solid-state electrolytes instead of traditional organic electrolytes, greatly improving the safety performance and energy density of batteries, and gradually becoming the development direction of lithium-ion batteries in the future. [0003] Lanthanum lithium zirconate (Li 7 La 3 Zr 2 o 12 , referred to as LLZO) is currently the best comprehensive performance, the most widely used solid electrolyte material, it has high ionic conductivity, stable electrochemical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/052C04B35/48C04B35/50C04B35/622C04B35/64C04B35/626
CPCC04B35/48C04B35/50C04B35/622C04B35/62805C04B35/62605C04B35/64H01M10/0562H01M10/052H01M2300/0071C04B2235/3227C04B2235/3203C04B2235/3248C04B2235/3287C04B2235/3251C04B2235/442Y02E60/10Y02P70/50
Inventor 林铁松王策林盼盼何鹏
Owner HARBIN INST OF TECH
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