NASICON type lithium ion solid electrolyte as well as preparation and application thereof

A solid electrolyte and solid electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor environmental stability, achieve improved conductivity, wide application, and facilitate design and assembly

Inactive Publication Date: 2019-02-15
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfide solid electrolytes often have high ionic conductivity, but due to their high hygroscopicity, their environmental stability is poor, and there is still a long way to go for practical commercial applications.

Method used

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  • NASICON type lithium ion solid electrolyte as well as preparation and application thereof
  • NASICON type lithium ion solid electrolyte as well as preparation and application thereof
  • NASICON type lithium ion solid electrolyte as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation method of the NASICON type lithium ion solid state electrolyte of the present embodiment comprises the following steps:

[0022] (1) The raw material LiNO 3 , Al(NO 3 ) 3 9H 2 O, Ti(OC 4 h 9 ) 4 , NH 4 h 2 PO 4 Weigh according to the molar ratio of (1.3-1.5):0.3:1.7:3, add the titanium source into the reaction vessel, add a certain amount of deionized water, and stir continuously at room temperature to form a white slurry;

[0023] (2) Prepare a 1:10 diluted nitric acid solution. Slowly add nitric acid solution into the above white slurry, and keep stirring until a light yellow clear solution is formed; weigh citric acid according to the molar ratio of citric acid to metal cations at 2:1, add it to the solution, stir magnetically in an oil bath, and form clear solution;

[0024] (3) Take lithium nitrate, aluminum nitrate, ammonium dihydrogen phosphate successively, weigh citric acid by citric acid and metal cation molar ratio 2:1, mix the thre...

Embodiment 2

[0035] The preparation method of the NASICON type lithium ion solid state electrolyte of the present embodiment comprises the following steps:

[0036] (1) The raw material LiNO 3 , Al(NO 3 ) 3 9H 2 O, Ti(OC 4 h 9 ) 4 , NH 4 h 2 PO 4 Weigh according to the molar ratio of (1.3-1.5):0.3:1.7:3, add the titanium source into the reaction vessel, add a certain amount of deionized water, and stir continuously at room temperature to form a white slurry;

[0037] (2) Prepare a 1:10 diluted nitric acid solution. Slowly add nitric acid solution into the above white slurry, and keep stirring until a light yellow clear solution is formed; weigh citric acid according to the molar ratio of citric acid to metal cations at 2:1, add it to the solution, stir magnetically in an oil bath, and form clear solution;

[0038] (3) Take lithium nitrate, aluminum nitrate, ammonium dihydrogen phosphate successively, weigh citric acid by citric acid and metal cation molar ratio 2:1, mix the thre...

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Abstract

The invention relates to NASICON type lithium ion solid electrolyte as well as a preparation and application thereof. The stoichiometric equation of the solid electrolyte is Li1+xAlxTi2-x(PO4)3, wherein x is more than or equal to 0 and less than or equal to 0.5. The solid electrolyte with excellent performance is synthesized by controlling the preparation process parameters such as a temperature rise rate, a pre-sintering temperature, pre-sintering time, a calcining temperature, calcining time and the like. The lithium ion solid electrolyte disclosed by the invention has the advantages that byvirtue of Al<3+> doping and increase of the lithium ion concentration and the carrier concentration, the probability of enabling the lithium ion to simultaneously occupy the positions AI and AII is improved, and energy of the lithium ion needed in the transition process is reduced, so that the room-temperature ionic conductivity of the solid electrolyte exceeds 10<-4>/cm, and the solid electrolyte can be applied to an all-solid-state battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a NASICON type lithium ion solid electrolyte, a preparation method and an application thereof. Background technique [0002] With the development of industrial society, the increase in energy consumption and the depletion of non-renewable resources, people's demand for new energy is becoming more and more urgent, and the requirements for energy storage technology are becoming more and more stringent. At present, the most widely used energy storage method is electrochemical energy storage, that is, using battery devices to perform electrochemical reactions to convert energy. Lithium-ion batteries are considered to have very broad development prospects in energy storage due to their high energy density and long service life. [0003] However, at present, commercial lithium-ion batteries often use organic electrolytes. Due to their flammability and leakage, there are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525C01B25/45
CPCC01B25/45C01P2002/72C01P2004/03H01M10/0525H01M10/0562H01M2300/0068Y02E60/10Y02P20/10
Inventor 杨程响
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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