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Lithium battery low-interfacial-resistance garnet structure solid electrolyte and preparation method thereof

A solid-state electrolyte, garnet technology, applied in electrolytes, secondary batteries, structural parts, etc., can solve the problems of lithium volatilization, high interface resistance between materials and electrodes, and achieve low interface resistance, shortened preparation time, and stable structure. Effect

Inactive Publication Date: 2019-12-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing garnet structure Li 7 La 3 Zr 2 o 12 The contact interface impedance between the material and the electrode is relatively large, and the preparation process is likely to cause defects such as lithium volatilization. The present invention proposes a low-impedance garnet structure solid electrolyte for lithium batteries and a preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a solid electrolyte with a low boundary resistance garnet structure for a lithium battery, comprising the following steps:

[0031] S1, press Li 7 La 2.9 Al 0.1 Zr 2 o 12 The stoichiometric ratio takes soluble lithium salt, zirconium nitrate, lanthanum nitrate, aluminum salt, joins in deionized water, and then ultrasonically disperses evenly to obtain a uniform dispersion containing various metal ions; the lithium salt is lithium chloride ; The aluminum salt is an aluminum sulfate solution; the power of the ultrasonic dispersion is 400W, and the time is 50min;

[0032] S2. Dry the uniform dispersion containing various metal ions obtained in step S1. The temperature is 90° C., the time is 100 min, ball milling, the ball milling speed is 440 r / min, the ball milling time is 45 min, and the precursor passed through a 200-mesh standard sieve is obtained. powder;

[0033] S3. Put the precursor powder obtained in step S2 into a semi-closed single-c...

Embodiment 2

[0036] A method for preparing a solid electrolyte with a low boundary resistance garnet structure for a lithium battery, comprising the following steps:

[0037] S1, press Li 7 La 2.8 Al 0.2 Zr 2 o 12 The stoichiometric ratio takes soluble lithium salt, zirconium nitrate, lanthanum nitrate, aluminum salt, joins in deionized water, and then ultrasonically disperses evenly to obtain a uniform dispersion containing various metal ions; the lithium salt is lithium sulfate; The aluminum salt is an aluminum sulfate solution; the power of the ultrasonic dispersion is 400W, and the time is 50min;

[0038] S2. Dry the uniform dispersion containing various metal ions obtained in step S1. The temperature is 100° C., the time is 60 minutes, ball milling, the ball milling speed is 400 r / min, the ball milling time is 60 minutes, and the precursor passed through a 200-mesh standard sieve is obtained. powder;

[0039] S3. Put the precursor powder obtained in step S2 into a semi-closed si...

Embodiment 3

[0042] A method for preparing a solid electrolyte with a low boundary resistance garnet structure for a lithium battery, comprising the following steps:

[0043] S1, press Li 7 La 2.9 Al 0.1 Zr 2 o 12 The stoichiometric ratio takes soluble lithium salt, zirconium nitrate, lanthanum nitrate, aluminum salt, joins in deionized water, and then ultrasonically disperses evenly to obtain a uniform dispersion containing various metal ions; the lithium salt is lithium nitrate; The aluminum salt is aluminum nitrate; the power of the ultrasonic dispersion is 350W, and the time is 40min;

[0044] S2. Dry the uniform dispersion containing various metal ions obtained in step S1. The temperature is 70° C., the time is 120 minutes, ball milling, the ball milling speed is 500 r / min, the ball milling time is 30 minutes, and the precursor passed through a 200-mesh standard sieve is obtained. powder;

[0045] S3. Put the precursor powder obtained in step S2 into a semi-closed single-crystal...

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Abstract

The invention belongs to the technical field of lithium battery preparation and relates to a lithium battery low-interfacial-resistance garnet structure solid electrolyte and a preparation method thereof. According to the lithium battery low-interfacial-resistance garnet structure solid electrolyte and the preparation method thereof, long-time ball milling and the introduction of impurities in a ball milling process during the preparation of Li7La3-xAlxZr2O12 are avoided; tabletting is carried out in a semi-closed single-crystal silicon carbide mold; calcination is carried out in a closed environment, the volatilization loss of a lithium element under high temperature and high pressure is hindered, problems such as the problem of the composition misalignment of the synthesized Li7La3-xAlxZr2O12 material are avoided; and the prepared doped garnet structure material is better in macroscopic compactness and more stable in structure; an amorphous layer on the surface of the garnet structure solid electrolyte sheet reduces the interface impedance of contact between the Li7La3-xAlxZr2O12 and an electrode.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a lithium battery low barrier garnet structure solid electrolyte and a preparation method. Background technique [0002] In recent years, lithium-ion batteries have broad application prospects in the fields of energy storage batteries and vehicle power batteries due to their high energy, strong discharge capacity, no memory effect, and high energy storage efficiency. At present, lithium-ion batteries generally use liquid electrolytes, but liquid electrolyte lithium batteries contain flammable liquid organic substances, which pose safety hazards such as fire and explosion. Compared with liquid electrolytes, solid electrolytes are non-volatile and generally non-flammable. Therefore, using solid electrolytes instead of liquid electrolytes in lithium batteries can fundamentally solve the safety problem of lithium battery electrolytes; and solid electro...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 陈庆李国松
Owner CHENDU NEW KELI CHEM SCI CO LTD