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A composite solid electrolyte separator, a preparation method thereof and a lithium ion battery

A solid electrolyte and diaphragm technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, solid electrolytes, etc., can solve the problems of low conductivity of solid electrolyte membrane, change of solid electrolyte crystal form, poor mechanical strength of diaphragm, etc. The effect of sintering time, maintaining crystal form and reducing sintering temperature

Active Publication Date: 2019-01-18
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-state electrolytes can be roughly divided into high-molecular polymer solid-state electrolytes and inorganic solid-state electrolytes. High-molecular polymer solid-state electrolytes have low ionic conductivity at room temperature, and the mechanical strength of the diaphragm is poor, and they dissolve at high temperatures; while inorganic solid electrolytes are various and have relatively High ionic conductivity and low electronic conductivity, but both oxide and sulfide electrolytes are sensitive to moisture and air, and LiCO is easy to form on the surface 3 and Li 2 O and other low conductivity materials
In the sintering process, the sintering temperature needs to be high and the time is long, which will easily lead to the volatilization of the lithium source, the change of the crystal form of the solid electrolyte, and the low conductivity of the formed solid electrolyte film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for preparing a composite solid-state electrolyte diaphragm, and the solid-state electrolyte uses lithium lanthanum zirconium oxide (LLZO); including the following steps:

[0032] 1) Put the LLZO powder into a porous container with micropore size, place the porous container in the reaction chamber, evacuate the reaction chamber, replace the argon at least three times, remove the oxygen and water between the particles or in the pores, Avoid residues reacting with precursor gas;

[0033] 2) Rotate the porous container to suspend and fully disperse the LLZO powder in the cavity of the porous container;

[0034] 3) Set the deposition process parameters: heat the temperature of the reaction chamber to 25°C, and the pressure of the reaction chamber to 100torr;

[0035] 4) Add TiCl for atomic layer deposition 4 The steam is introduced into the reaction chamber under nitrogen or argon, adsorbed on the surface of the LLZO powder, and kept for 60...

Embodiment 2

[0040] This embodiment provides a method for preparing a composite solid-state electrolyte diaphragm. The solid-state electrolyte uses lithium lanthanum titanate (LLTO), including the following steps:

[0041] 1) Put the LLTO powder into a porous container with micropore size, place the porous container in the reaction chamber, evacuate the reaction chamber, replace the argon at least three times, remove the oxygen and water between the particles or in the pores, Avoid residues reacting with precursor gas;

[0042] 2) The argon fluidization method is used to suspend and fully disperse the LLTO powder in the cavity of the porous container;

[0043] 3) Set the deposition process parameters: heat the temperature of the reaction chamber to 100°C, and the pressure of the reaction chamber to 200torr;

[0044] 4) Al(CH) for atomic layer deposition 3 ) 3 The steam was introduced into the reaction chamber under nitrogen or argon, adsorbed on the surface of the LLTO powder, and kept ...

Embodiment 3

[0049] This embodiment provides a preparation method of a composite solid electrolyte diaphragm, and the solid electrolyte adopts Li 2 S and P 2 S 5 The mixed powder mixed with a mass ratio of 80:20 comprises the following steps:

[0050] 1) will Li 2 S and P 2 S 5 The mixed powder is put into a porous container with micropore size, the porous container is placed in the reaction chamber, the reaction chamber is evacuated, and the argon gas is replaced at least three times to remove the oxygen and water between the particles or in the pores to avoid residual The reaction between the substance and the precursor gas;

[0051] 2) Argon fluidization is used to make Li 2 S and P 2 S 5 The mixed powder is suspended and fully dispersed in the cavity of the porous container;

[0052] 3) Set the deposition process parameters: heat the temperature of the reaction chamber to 150°C, and the pressure of the reaction chamber to 1torr;

[0053] 4) Zr[N(CH 3 ) 2 ] 4 The steam is i...

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of a composite solid electrolyte separator, comprising the following steps: 1) coating thesurface of a solid electrolyte powder with a metal oxide layer by an atomic layer deposition method; 2) hot pressing the solid electrolyte powder coated with metal oxide layer at 200-1400 DEG C and cooling to room temperature to obtain the composite solid electrolyte membrane. The invention also provides a composite solid electrolyte membrane prepared by adopting the preparation method. The invention also provides a lithium ion battery, comprising a positive electrode, a negative electrode and a composite solid electrolyte separator between the positive electrode and the negative electrode. Bycoating the surface of the solid electrolyte with the metal oxide, the invention can prevent the metal oxide from reacting with air or water, can also be doped and used as a high-temperature sintering auxiliary agent, which is favorable for lowering the sintering temperature, shortening the sintering time, improving the density, and the metal ion doping is favorable for improving the ionic conductivity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite solid electrolyte diaphragm, a preparation method thereof and a lithium ion battery. Background technique [0002] The solid electrolyte diaphragm is one of the important components of the battery. It plays the role of separating the positive and negative electrolytes and conducting the internal ionic current of the battery. The performance of the diaphragm determines key characteristics such as battery capacity, cycleability, charge and discharge current density, etc. . Therefore, a separator with excellent performance plays an important role in improving the overall performance of the battery. Solid-state electrolytes can be roughly divided into high-molecular polymer solid-state electrolytes and inorganic solid-state electrolytes. High-molecular polymer solid-state electrolytes have low ionic conductivity at room temperature, and the mech...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0562
CPCH01M10/0562H01M10/058H01M2300/0068H01M2300/0071Y02E60/10Y02P70/50
Inventor 解明
Owner 柔电(武汉)科技有限公司
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