Solid electrolyte and preparation method thereof

A solid electrolyte and crystal technology, applied in chemical instruments and methods, circuits, electrical components, etc., can solve the problems of unsatisfactory solid electrolytes, high boundary resistance of solid particles, chemical stability deviation, etc., and achieve high ionic conductivity and high ionic conductivity. Effects of chemical stability, electrochemical stability improvement, and ionic conductivity improvement

Inactive Publication Date: 2015-04-29
HYB BATTERY
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  • Abstract
  • Description
  • Claims
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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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  • Solid electrolyte and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] (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;

[0048] (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;

[0049] (3) Grind the white powder obtained in ...

Embodiment 2

[0051] (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·H2 2% of the total moles of O in B 2 o 3 as a sintering aid;

[0052] (2) Other steps were processed according to steps (2) and (3) of Example 1 to obtain a solid electrolyte.

Embodiment 3

[0054] (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;

[0055] (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 a solid electrolyte and a preparation method thereof. The solid electrolyte is formed by monoclinic phase lithium zirconate crystal admixed with M element, and the monoclinic phase lithium zirconate crystal admixed with the M element is that M ions are admixed to lithium niobate crystal and the composition of the chemical formula is Li6+yZr2-xMxO7, wherein X is equal to 0.01-0.4, and M is a positive divalent metal element or a positive trivalent metal element; when M is the positive divalent metal element positive, and Y is equal to 2x; and when the M is the positive trivalent metal element, and y is equal to x. The method comprises steps for preparing the monoclinic phase lithium zirconate crystal admixed with the M element by adopting a high-temperature solid-phase method and dry-pressure sintering, and has the advantages of high production efficiency and high yield and purity; the safety problem of a lithium-ion battery is solved thoroughly because of no use of any liquid organic solvent; and the prepared solid electrolyte has high ionic conductivity, excellent electrochemical stability, and a very wide application prospect.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a solid electrolyte for lithium ion batteries and a preparation method 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. secondary battery. Before breakthroughs are made in the research of other new energy storage materials, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562C01G25/00
CPCY02E60/10
Inventor 廖友好李伟善邱显焕冯岸柏冯洪亮
Owner HYB BATTERY
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