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Oxide solid electrolyte and preparation method thereof

A technology of solid electrolyte and oxide, applied in the direction of electrolyte, non-aqueous electrolyte battery, circuit, etc., can solve the problems of high sintering temperature, increased energy consumption, reduced cost, disadvantages, etc., and achieve the effect of preventing electrolyte performance and reducing cost

Inactive Publication Date: 2021-07-02
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the preparation methods of oxide solid electrolytes include high-temperature solid-phase methods, sol-gel methods, etc., but the preparation methods of oxide solid electrolytes that have been mass-produced in the industry usually use high-temperature solid-phase methods, but high-temperature solid-phase methods The sintering temperature of the oxide solid electrolyte is usually higher than 900°C. For example, the sintering temperature of the Garnet-type solid electrolyte is as high as 1200°C, the sintering temperature of the NASICON-type solid electrolyte is 900-1000°C, and the sintering temperature of the Perovskite-type solid electrolyte is also as high as 1200°C. Excessively high sintering temperature increases energy consumption, which is not conducive to cost reduction

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  • Oxide solid electrolyte and preparation method thereof
  • Oxide solid electrolyte and preparation method thereof

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preparation example Construction

[0018] In the first aspect, the embodiment of the present application provides a method for preparing an oxide solid electrolyte. The oxide solid electrolyte is sintered and crystallized from a lithium salt precursor and a main material. The lithium salt precursor includes at least two kinds of lithium salts. A lithium salt eutectic system with a eutectic temperature of 100-450°C. The preparation method includes: sintering and crystallizing a mixture formed of a lithium salt precursor and a main material at a temperature of 300-750°C to obtain an oxide solid electrolyte.

[0019] The present application adopts a lithium salt eutectic system formed by at least two lithium salts with a eutectic temperature of 100-450°C as a lithium salt precursor, which can reduce the sintering temperature, sintering at a temperature of 300-750°C, and lithium salt eutectic The system and the main material are melted and reacted to form the primary oxide solid electrolyte, which crystallizes durin...

Embodiment 1

[0051] This embodiment provides a method for preparing an oxide solid electrolyte, which includes:

[0052] LiOH·H with a molar ratio of 0.38:0.62 2 O and LiNO 3 The lithium salt eutectic system is used as the lithium salt precursor, and the eutectic temperature of the lithium salt eutectic system is 175.7°C. Weigh 10.36g LiOH·H 2 O and 27.79g LiNO 3 Add in the ball mill jar, put 48.87g La 2 o 3 , 18.48g ZrO 2 and 11.05gTa 2 o 5 respectively added into the ball mill jar, and then added isopropanol for ball milling for 10 hours to obtain a mixed slurry.

[0053] Pour the mixed slurry into a beaker and blow dry at 90°C for 10 hours to obtain the mixture. Put the mixture into a sagger at a heating rate of 5°C / min to 400°C for heat treatment, and the holding time is 4 hours; after the heat treatment The temperature was raised to 750°C for sintering, and the holding time was 8h.

[0054] Annealing after sintering yields cubic Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 oxide soli...

Embodiment 2

[0056] This embodiment provides a method for preparing an oxide solid electrolyte, which includes:

[0057] LiNO with a molar ratio of 0.71:0.29 3 The lithium salt eutectic system with LiCl is used as the lithium salt precursor, and the eutectic temperature of the lithium salt eutectic system is 221.6°C. Weigh 31.8gLiNO 3 and 7.99gLiCl are added to the ball mill jar, and 48.87gLa 2 o 3 , 18.48g ZrO 2 and 11.05g Ta 2 o 5 respectively added into the ball mill jar, and then added isopropanol for ball milling for 10 hours to obtain a mixed slurry.

[0058] Pour the mixed slurry into a beaker and blow dry at 90°C for 10 hours to obtain the mixture. Put the mixture into a sagger at a heating rate of 5°C / min to 400°C for heat treatment, and the holding time is 6 hours; after the heat treatment The temperature is raised to 750°C for sintering, and the holding time is 10h.

[0059] Annealing after sintering yields cubic Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 oxide solid electrolyt...

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Abstract

An oxide solid electrolyte and a preparation method thereof belong to the technical field of batteries. The oxide solid electrolyte is formed by sintering and crystallizing a lithium salt precursor and a main material, the lithium salt precursor comprises a lithium salt eutectic system which is formed by at least two lithium salts and has the eutectic temperature of 100-450 DEG C. The preparation method comprises the following steps: sintering and crystallizing a mixture formed by the lithium salt precursor and the main material at the temperature of 300-750 DEG C to obtain the oxide solid electrolyte. The preparation method can reduce the sintering temperature and is beneficial to reducing the cost.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to an oxide solid electrolyte and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of new energy vehicles and portable electronic devices, higher requirements have been placed on the safety and energy density of lithium-ion batteries. Due to the low ignition point and volatile carbonate electrolyte, lithium-ion batteries have serious safety hazards. Thermal runaway is usually accompanied by severe fire or even explosion. Matching positive electrode materials with higher energy density and metal lithium negative electrodes will further aggravate the battery life. security issues. In contrast, solid-state lithium batteries using oxide solid electrolytes have advantages in improving safety. [0003] At present, the preparation methods of oxide solid electrolytes include high-temperature solid-phase methods, sol-gel me...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/447C04B35/462C04B35/622C04B35/653C04B35/64H01M10/0562H01M10/052
CPCC04B35/48C04B35/447C04B35/462C04B35/622C04B35/653C04B35/64H01M10/0562H01M10/052H01M2300/0071C04B2235/3203C04B2235/3227C04B2235/3251C04B2235/662C04B2235/6562C04B2235/6567C04B2235/762C04B2235/3232C04B2235/3217C04B2235/3287Y02E60/10
Inventor 石兴菊谢普熊伟强尚旭李艳红梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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