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Gallium and molybdenum co-doped garnet type lithium ion solid electrolyte and preparation method thereof

A solid electrolyte, garnet-type technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of high price and high production cost

Active Publication Date: 2018-11-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most existing ones are by doping Ga 3+ To obtain high lithium ion conductivity, however, the high price of gallium makes the production cost too high

Method used

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  • Gallium and molybdenum co-doped garnet type lithium ion solid electrolyte and preparation method thereof
  • Gallium and molybdenum co-doped garnet type lithium ion solid electrolyte and preparation method thereof
  • Gallium and molybdenum co-doped garnet type lithium ion solid electrolyte and preparation method thereof

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Embodiment 1

[0026] This embodiment provides a method for preparing a garnet-type lithium-ion solid electrolyte co-doped with gallium and molybdenum, which specifically includes the following steps:

[0027] S1, weigh Li respectively 2 CO 3 Powder 10.322g, ZrO 2 Powder 9.36g, Ga 2 o 3 Powder 0.562g, La 2 o 3 Powder 19.548g and MoO 3 Powder 0.576g. Among them, 10.322g of Li 2 CO 3 The powder already contains 10% of the capacity, that is, according to the general chemical formula Li 6.35 Ga 0.15 La 3 Zr 1.9 Mo 0.1 o 12 After determining the mass of each powder, take more Li with a mass fraction of 10%. 2 CO 3 powder.

[0028] Specifically, since Li 2 CO 3 Li produced by powder decomposition 2 O will sublimate at a temperature higher than 1000 ° C, so Li 2 O will sublimate and affect the synthesis of materials, so when batching, take more Li with a mass fraction of 10%. 2 CO 3 The powder is mainly used to make up for the sublimated Li at high temperature during subseque...

Embodiment 2

[0044] This embodiment provides a method for preparing a garnet-type lithium-ion solid electrolyte co-doped with gallium and molybdenum, which specifically includes the following steps:

[0045] S1, weigh Li respectively 2 CO 3 Powder 10.485g, ZrO 2 Powder 9.611g, Ga 2 o 3 Powder 0.562g, La 2 o 3 Powder 19.548g and MoO 3 Powder 0.228g. Among them, 10.458g of Li 2 CO 3 A 10% tolerance is already included in the powder.

[0046] S2. Mix all the powders obtained in step S1 and grind together to form a first material to be molded, and the particle size of the first material to be molded is ≤10 μm.

[0047] Specifically, ball milling was used for grinding. All the powders were put into an agate ball mill jar, absolute ethanol was used as the ball milling solvent, zirconia balls were used as the ball milling medium, and the speed was 650r / min, and ball milling was carried out in a planetary ball mill for 12 hours. After the ball milling, dry at 110° C. to obtain the unifo...

Embodiment 3

[0053] This embodiment provides a method for preparing a garnet-type lithium-ion solid electrolyte co-doped with gallium and molybdenum, which specifically includes the following steps:

[0054] S1, weigh Li respectively 2 CO3 Powder 10.16g, ZrO 2 Powder 9.118g, Ga 2 o 3 Powder 0.562g, La 2 o 3 Powder 19.548g and MoO 3 Powder 0.864g. Among them, 10.16g of Li 2 CO 3 A 10% tolerance is already included in the powder.

[0055] S2. Mix all the powders obtained in step S1 and grind together to form a first material to be molded, and the particle size of the first material to be molded is ≤10 μm.

[0056] Specifically, ball milling was used for grinding. All the powders were put into an agate ball milling jar, absolute ethanol was used as the ball milling solvent, zirconia balls were used as the ball milling medium, and the rotation speed was 400r / min, and ball milling was carried out in a planetary ball mill for 8 hours. After the ball milling, dry at 90° C. to obtain the...

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Abstract

The invention relates to gallium and molybdenum co-doped garnet type lithium ion solid electrolyte and a preparation method thereof. A constituent general formula of the gallium and molybdenum co-doped garnet type lithium ion solid electrolyte is Li6.55-2xGa0.15La3Zr2-xMoxO12, wherein x is greater than or equal to 0.05, and smaller than or equal to 0.25. The gallium and molybdenum co-doped garnettype lithium ion solid electrolyte has relatively high lithium ion conductivity, and greatly reduces the cost. The preparation method for the gallium and molybdenum co-doped garnet type lithium ion solid electrolyte is simple in process, and is low in cost; and compaction of the prepared gallium and molybdenum co-doped garnet type lithium ion solid electrolyte is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte materials, in particular to a garnet-type lithium-ion solid electrolyte co-doped with gallium and molybdenum and a preparation method thereof. Background technique [0002] With the intensification of environmental pollution, people's demand for building an environment-friendly and energy-saving society is becoming stronger and stronger. Compared with traditional secondary batteries such as nickel-chromium batteries, lead-acid batteries and nickel-metal hydride batteries, lithium-ion batteries have the advantages of higher operating voltage, greater energy density, longer cycle life, and smaller self-discharge rate. , and no pollution, no memory effect, has great potential for development. At present, traditional lithium-ion batteries use organic electrolytes as electrolytes, but organic liquid electrolytes may volatilize, dry up, and leak during use, affecting battery life, and organic...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 刘涛易茂义王相南李静云莫扬成魏颖
Owner NORTHEASTERN UNIV
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