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Monoclinic phase lithium zirconate crystal and preparation method and application thereof

A technology of oblique phase lithium zirconate and phase lithium zirconate, applied in the field of monoclinic phase lithium zirconate crystal and its preparation, can solve the problems of unsatisfactory solid electrolyte, high boundary resistance of solid particles, deviation of chemical stability and the like, Achieve the effect of high production efficiency, good electrochemical stability, and simplified assembly process

Inactive Publication Date: 2013-02-13
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research on solid electrolytes mainly focuses on lithium-ion solid electrolytes with NASICON structure, LISICON structure, perovskite structure and garnet-like structure. However, these solid electrolytes are still unsatisfactory, and there are high prices and deviations in chemical stability. , Harsh preparation conditions, low ionic conductivity, high boundary resistance between solid particles, etc., still need further development and breakthroughs in technical bottlenecks
[0005] Monoclinic lithium zirconate Li 6 Zr 2 o 7 It is a three-dimensional lithium ion conductor, which has been applied as an adsorbent for adsorbing carbon dioxide gas at high temperature, but pure Li 6 Zr 2 o 7 The ionic conductivity is low, and it has not been widely used in the field of solid electrolytes.

Method used

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  • Monoclinic phase lithium zirconate crystal and preparation method and application thereof
  • Monoclinic phase lithium zirconate crystal and preparation method and application thereof
  • Monoclinic phase lithium zirconate crystal and preparation method and application thereof

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Effect test

Embodiment 1

[0049] (1) The chemical formula is Li prepared by high-temperature solid-state method 6.15 Zr 1.85 Y 0.15 o 7 Solid electrolyte: LiOH·H 2 O powder, ZrO 2 Powder and Y 2 o 3 The powder was weighed according to the stoichiometric ratio, and it was ground and mixed with an agate mortar for 2 hours. In order to supplement the LiOH·H 2 Loss of lithium ions in O, adding an excess of 10wt% LiOH·H before powder grinding 2 Grinding together with O, in order to obtain a smaller grain boundary resistance between solid particles, adding a mole number of ZrO 2 , Y 2 o 3 and LiOH·H 2 2% of the total moles of O in B 2 o 3 as a sintering aid;

[0050] (2) Put the uniformly mixed powder in step (1) into an alumina crucible with a lid, put the crucible into a muffle furnace at a heating rate of 3°C / min to 800°C and keep it at this temperature for 20 hours, Then the sample is cooled to room temperature at a cooling rate of 10°C / min;

[0051] (3) Grind the white powder obtained in ...

Embodiment 2

[0053] (1) The chemical formula is Li prepared by high-temperature solid-state method 6.15 Zr 1.85 In 0.15 o 7 Solid electrolyte: LiOH·H 2 O powder, ZrO 2 Powder and In 2 o 3 The powder was weighed according to the stoichiometric ratio, and mixed with an agate mortar for 1.5 hours. In order to supplement the LiOH·H 2 Loss of lithium ions in O, adding an excess of 9wt% LiOH·H to the powder before grinding 2 Grinding together with O, in order to obtain a smaller grain boundary resistance between solid particles, adding a mole number of ZrO 2 , Y 2 o 3 and LiOH·H 2 2% of the total moles of O in B 2 o3 as a sintering aid;

[0054] (2) Other steps were processed according to steps (2) and (3) of Example 1 to obtain a solid electrolyte.

Embodiment 3

[0056] (1) The chemical formula is Li prepared by high-temperature solid-state method 6.3 Zr 1.85 Zn 0.15 o 7 Solid electrolyte: LiOH·H 2 O powder, ZrO 2 The powder and ZnO powder were weighed according to the stoichiometric ratio, and mixed with an agate mortar for 2 hours. In order to supplement the LiOH·H 2 Loss of lithium ions in O, adding an excess of 10wt% LiOH·H before powder grinding 2 Grinding together with O, in order to obtain a smaller grain boundary resistance between solid particles, adding a mole number of ZrO 2 , ZnO and LiOH·H 2 2% of the total moles of O in B 2 o 3 as a sintering aid;

[0057] (2) Other steps were processed according to steps (2) and (3) of Example 1 to obtain a solid electrolyte.

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Abstract

The invention relates to monoclinic phase lithium zirconate crystal and a preparation method and application thereof. The monoclinic phase lithium zirconate crystal mixed with M elements is that M ions are mixed in lithium niobate crystal. The chemical formula is Li6 + yZr2 - xMxO7, wherein the x is 0.01 to 0.4, and the M is positive divalent or positive trivalent metal elements. When the M is positive divalent metal elements, the y is equal to 2x; and when the M is positive trivalent metal elements, the y is equal to x. The preparation method is a high temperature solid state method which is high production efficiency, high in product output and high in purity. The application is applied to the aspect of lithium ion battery solid electrolyte. The monoclinic phase lithium zirconate crystal is high in ionic conductivity, good in electrochemical stability, high in safety and wide in application prospect in the field of lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion crystals, in particular to a monoclinic lithium zirconate crystal doped with M element for preparing a solid electrolyte of a lithium ion battery, and a preparation method and application thereof. Background technique [0002] The contradiction between energy and the environment is becoming more and more serious, and the rapid development of human economy will inevitably increase the demand for the electronic industry, which further deepens the contradiction between energy and the environment. In order to alleviate and resolve these contradictions, the focus of scientific research is on energy storage materials with high specific energy, light weight, green and safe. Compared with other energy storage batteries, lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, high working voltage, long cycle life and environmental friendliness. seconda...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/00
Inventor 廖友好李伟善邱显焕冯岸柏冯洪亮
Owner HYB BATTERY
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