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A solid-state electrolyte, a method for making the same, and an all-solid-state lithium battery

A solid electrolyte, lithium battery technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of poor battery cycle performance, complex process conditions, difficult to control, etc., and achieve low grain resistance, ion conductivity, etc. High rate, improve the effect of the interface

Active Publication Date: 2016-08-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle performance of the battery prepared by this method is not good. At the same time, the battery needs to be annealed at high pressure and high temperature, and the process conditions are complicated and difficult to control.

Method used

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  • A solid-state electrolyte, a method for making the same, and an all-solid-state lithium battery
  • A solid-state electrolyte, a method for making the same, and an all-solid-state lithium battery
  • A solid-state electrolyte, a method for making the same, and an all-solid-state lithium battery

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preparation example Construction

[0022] refer to figure 2 , the present invention also relates to a preparation method of a solid electrolyte, the preparation method comprising the following steps:

[0023] Step 1: Provide a kind of matrix 10, described matrix is ​​garnet type fast ion conductor Li 7 m 3 Zr 2 o 12 or Li 5 Ta 3 m 2 o 12 , where M is one or more of La, Al, Sr, Sc, Cr, Ba, Fe, Mo, Y;

[0024] Step 2: Coating a layer of surface modification layer 20 on the surface of the substrate 10 by one of radio frequency magnetron sputtering, pulsed laser deposition, and electron beam evaporation, and the surface modification layer 20 is amorphous silicic acid One of lithium, lithium sulfate, or lithium tungstate, such as figure 2 shown.

[0025] Generally, the thickness of the surface modification layer is 0.1 nm to 500 nm. The lithium silicate is Li 2 SiO 3 , Li4 SiO 4 , Li 8 SiO 6 , Li 2 Si 2 o 5 , Li 6 Si 2 o 7 or Li 2 Si 5 o 11 .

[0026] Such as image 3 As shown, the all-s...

Embodiment 1

[0030] (1) Preparation of garnet-type fast ion conductors (Li 7 La 3 Zr 2 o 12 electrolyte)

[0031] The Li 7 La 3 Zr 2 o 12 The electrolyte is synthesized by a solid-phase method. First, provide the raw material lithium hydroxide (LiOH is produced by AlfaAesar, content >99.9%), treat the lithium hydroxide in an oven at 200°C for 6 hours, and cool to room temperature; add lithium with a molar ratio of 10% to the raw material hydrogen Lithium oxide to compensate for the loss of lithium in the annealing process; add lithium hydroxide, lanthanum oxide (the La 2 o 3 Produced by AlfaAesar, the content is >99.99%; it is calcined at 900°C for 24 hours), and zirconia (the ZrO 2 It is produced by Aldrich company, the content is >99%), the powder is dissolved in isopropanol, and passed through zirconia ball milling in air atmosphere for 12 hours. This process is annealed at 900 ° C, and then passed through zirconia in air atmosphere. Ball milling for 12 hours, this process is...

Embodiment 2

[0038] (1) Preparation of garnet-type fast ion conductors (Li 7 La 3 Zr 2 o 12 electrolyte)

[0039] The Li 7 La 3 Zr 2 o 12 Electrolytes were also synthesized by solid-phase methods. The preparation method is the same as in Example 1.

[0040] (2) Preparation of garnet-type fast ion conductors with a modified layer on the surface

[0041] The above garnet-type Li 7 La 3 Zr 2 o 12 The electrolyte is placed on the substrate as a substrate, and lithium silicate (Li 4 SiO 4 ) as a target, placed in the radio frequency magnetron sputtering equipment, through the method of radio frequency magnetron sputtering in the garnet-type Li 7 La 3 Zr 2 o 12 A layer of lithium silicate (Li 4 SiO 4 ), and finally the surface is coated with lithium silicate (Li 4 SiO 4 ) garnet-type fast ion conductor material, that is: composite garnet-type fast ion conductor, marked as A2. In this example, lithium silicate (Li 4 SiO 4 ) has a thickness of 10 nm on the surface of the g...

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Abstract

The invention relates to a solid electrolyte. The solid electrode comprises a substrate, and the substrate is a garnet type fast ion conductor Li7M3Zr2O12 or Li5Ta3M2O12, wherein the M can be one or more components selected from La, Al, Sr, Sc, Cr, Ba, Fe, Mo, and Y. The surface of the substrate is covered by a surface modification layer which can carry out plastic deformation, and the surface modification layer is made of non-crystal lithium silicate, lithium sulfate, or lithium tungstate. The invention also relates to a preparation method of the solid electrolyte. The solid electrolyte is covered by a surface modification layer made of non-crystal lithium silicate, lithium sulfate or lithium tungstate, and the non-crystal lithium silicate, lithium sulfate, and lithium tungstate are all flexible, can carry out plastic deformation, and all have a high ionic conductivity; so the surface modification layer can fully carry out surface contact with the garnet type fast ion conductor, thus the interfaces between the crystals in the solid electrolyte and the interfaces between the electrodes and the solid electrolyte are all improved, the interface impedance and grain resistance are low, and the durability and circulation performance are both prominently improved.

Description

technical field [0001] The invention relates to a solid electrolyte and an all-solid lithium battery containing the solid electrolyte, in particular to a solid electrolyte with good interface contact and stability and an all-solid lithium secondary battery containing the solid electrolyte. Background technique [0002] At present, the main source of power for small and medium-sized cars is to burn gasoline. However, with the depletion of oil resources and the deterioration of the environment, people urgently need to find a green energy to replace it. Among the many energy alternatives at present, lithium-ion batteries have gradually entered people's sight due to their high energy density, good cycle performance, and no memory effect, and have become the focus of researchers in recent years. [0003] However, currently commercially available lithium secondary batteries use flammable and explosive organic carbonate electrolytes as the organic electrolyte solution, which leads ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0068Y02E60/10
Inventor 裴佳宁
Owner HUAWEI TECH CO LTD
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