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Crystalline Li3OCl inorganic lithium ion conductor as well as preparation method and application thereof

An ion conductor, inorganic lithium technology, applied in the field of solid electrolyte preparation, can solve the problems of poor controllability of material morphology and electrochemical performance, harsh synthesis equipment and process conditions, etc., to improve lithium ion conductivity and control products. Morphology, the effect of high product conductivity

Active Publication Date: 2020-08-04
CHANGSHA STORM ENERGY TTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, Li 3 The synthesis methods of OCl inorganic electrolyte mainly include hydrothermal method, high-pressure solid-phase method, etc. The synthesis equipment and process conditions are relatively harsh, and the controllability of material morphology and electrochemical performance is not good.

Method used

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  • Crystalline Li3OCl inorganic lithium ion conductor as well as preparation method and application thereof
  • Crystalline Li3OCl inorganic lithium ion conductor as well as preparation method and application thereof
  • Crystalline Li3OCl inorganic lithium ion conductor as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Lithium hydroxide, lithium oxide and lithium chloride were prepared in a molar ratio (1.8 : 0.1 :1), ball milled to mix the three compounds evenly, and the mixture was placed in a vacuum tube furnace at a rate of 2°C / min to 300 ℃, and kept at 300℃ for 5h to obtain a molten precursor; uniformly disperse 0.2 mole of metal zinc powder in the molten precursor, and raise the temperature to 400℃ for 20h; then o Cool down to room temperature at a cooling rate of C / min. The resulting product is pulverized with a ball mill to obtain Zn-doped Li with a particle size distribution between 150-325 mesh. 3 OCl electrolyte material.

[0027] figure 1 Pure phase Li 3 OCl and embodiment 1 gained Zn-doped Li 3 The XRD collection of OCl; Whether can be seen in present embodiment 1 gained Zn-doped Li 3 OCl is crystalline

[0028] figure 2 For the obtained Zn doped Li of embodiment 1 3 The microscopic morphology of OCl, as can be seen from the figure, the resulting Zn-doped Li 3 ...

Embodiment 2

[0031] Lithium hydroxide, lithium oxide and lithium chloride were prepared in a molar ratio (1.8 : 0.1 :1), ball milled to mix the three compounds evenly, and the mixture was placed in a vacuum tube furnace at a rate of 2°C / min to 300 ℃, and held at 300°C for 5 hours to obtain a molten precursor; 0.05 mole metal zinc powder was uniformly dispersed in the molten precursor, and the temperature was raised to 400°C for 20 hours; o Cool down to room temperature at a cooling rate of C / min. The resulting product is pulverized with a ball mill to obtain Zn-doped Li with a particle size distribution between 150-325 mesh. 3 OCl electrolyte material. According to the above method, a symmetrical battery was prepared and the electrochemical performance was tested. The results showed that: 0.05 moles of Zn doped Li 3 The room temperature ionic conductivity of OCl is 0.95×10 -3 S / cm.

Embodiment 3

[0033] Prepare lithium hydroxide, lithium oxide and lithium chloride in a molar ratio (1.8 : 0.1 :1), ball mill to mix the three compounds evenly, put the mixture in a vacuum tube furnace, and raise it to 300 °C at a rate of 2 °C / min ℃, and held at 300°C for 5 hours to obtain a molten precursor; 0.1 mole metal zinc powder was uniformly dispersed in the molten precursor, and the temperature was raised to 400°C for 20 hours; o Cool down to room temperature at a cooling rate of C / min. The resulting product is pulverized with a ball mill to obtain Zn-doped Li with a particle size distribution between 150-325 mesh. 3 OCl electrolyte material. According to the above method, a symmetrical battery was prepared and the electrochemical performance was tested. The results showed that: 0.1 mole Zn doped Li 3 The room temperature ionic conductivity of OCl is 1.0×10 -3 S / cm.

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Abstract

The invention discloses a crystalline Li3OCl inorganic lithium ion conductor as well as a preparation method and an application thereof. The Li3OCl inorganic lithium ion conductor is Zn-doped Li3OCl,and the preparation method comprises the following steps: uniformly mixing lithium hydroxide, lithium oxide and lithium chloride in proportion, and melting above the eutectic point of lithium hydroxide, lithium oxide and lithium chloride to obtain a precursor; and mixing the precursor with metal zinc powder, and carrying out heat treatment at a temperature higher than the melting temperature of the precursor in a protective atmosphere to obtain the product Zn-doped Li3OCl. The Li3OCl inorganic lithium ion conductor provided by the invention has excellent lithium ion conductivity and environmental stability. The preparation method provided by the invention is short in preparation period, low in cost, high in process controllability and suitable for industrial application.

Description

technical field [0001] The present invention relates to a kind of crystalline Li 3 The invention discloses an OCl inorganic lithium ion conductor and a preparation method and application thereof, belonging to the technical field of solid electrolyte preparation. Background technique [0002] Due to its technical advantages such as high operating voltage, high energy density, high energy efficiency, low self-discharge rate, long cycle life, and no memory effect, lithium-ion batteries are the battery devices with the best overall performance so far. However, the organic electrolytes used in lithium-ion batteries currently on the market have safety issues such as leakage, electrode corrosion, and even oxidative combustion. Lithium ion inorganic solid electrolyte can well avoid the above problems, and has high lithium ion conductivity (up to 10 -2 S / cm), good chemical stability, and large potential window (5-10 V), it is very promising to develop a new type of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04H01M10/0525H01M10/0562
CPCC01D15/04C01P2002/54C01P2002/72C01P2004/01C01P2006/40H01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 刘清虎
Owner CHANGSHA STORM ENERGY TTECH
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