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A preparation method of solid electrolyte with surface coating and solid electrolyte battery

A solid-state electrolyte and surface coating technology, applied in electrolytes, secondary batteries, circuits, etc., can solve the problems of not achieving high lithium ion conductivity, and achieve the effect of ensuring lithium ion conductivity and improving interface impedance

Active Publication Date: 2020-12-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cooling process of LLZO without any element doping at high temperature, the cubic phase formed at high temperature is easy to return to the tetragonal phase, thus failing to meet the requirement of high lithium ion conductivity

Method used

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  • A preparation method of solid electrolyte with surface coating and solid electrolyte battery
  • A preparation method of solid electrolyte with surface coating and solid electrolyte battery
  • A preparation method of solid electrolyte with surface coating and solid electrolyte battery

Examples

Experimental program
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Embodiment 1

[0030] The target product of the inorganic ceramic sheet of the present embodiment is Li 6.35 Ga 0.15 La 3 Zr 1.8 Nb 0.2 o 12 .

[0031] The method for preparing a solid electrolyte with a surface coating in this embodiment includes the following steps:

[0032] S1, preparation of LLZO ceramic sheet: weigh Li respectively according to the stoichiometric ratio of the molecular formula (ie 6.35:3:1.8:0.2:0.15) 2 CO 3 , La 2 o 3 , ZrO 2 , Nb 2 o 5 and Ga 2 o 3 , the number of moles can be selected according to the size of the ball milling jar (0.02-0.1mol can be milled in a 1L ball milling jar). Among them, Li 2 CO 3 Excessive 5-20%. After the 5 kinds of raw materials are poured into the ball milling tank, isopropanol and ball milling beads are added for the first ball milling. The rotational speed of the first ball mill is 200-300rpm, and the time is 12-36h. After the first ball milling is completed, the solvent is dried to obtain a white powder (ie, the precu...

Embodiment 2

[0042] The steps of the preparation method of the solid electrolyte with surface coating in this embodiment are basically the same as the steps in Example 1, the difference is: (1) in step S4 of this embodiment, the lithium ion electrolyte and fumed silica The mixing is carried out in a beaker; (2) in step S5 of this embodiment, the prepared LLZO ceramic sheet is soaked in the above-mentioned FS glue solution.

[0043] In this embodiment, the lithium ion electrolyte solution (EC:DEC=1:1, LiPF6=1mol / L) and FS are mixed in a beaker according to the mass ratio of 20 to 50:1, and then stirred evenly with a magnet to form a transparent and Slightly viscous liquid.

[0044] Soak the obtained LLZO ceramic sheet in the above solution for 1 to 10 minutes, and clamp it out to obtain a solid electrolyte with an FS adhesive layer. The structure of the solid electrolyte with a surface coating is as follows: Figure 5 shown.

[0045] The invention provides a method for preparing a solid-s...

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Abstract

The invention discloses a preparation method of a solid electrolyte with a surface coating. The preparation method comprises the steps of preparation of an LLZO ceramic chip, preparation of FS glue, formation of the solid electrolyte and the like. The invention further provides a solid-state electrolyte battery which comprises the solid electrolyte prepared by the preparation method of the solid electrolyte with the surface coating, and further comprises a positive electrode layer and a negative electrode layer which are arranged on the two sides of the solid electrolyte. The solid electrolyteprepared by the method has the advantages that firstly, an inorganic ceramic material is doped with Ga and Nb elements, so that the cubic phase structure of LLZO is stabilized, and the ionic conductivity is correspondingly improved; secondly, the two sides of the inorganic solid electrolyte are coated with the mixed fumed silica in the lithium ion electrolyte, so that the problem of interface contact is effectively solved, and the lithium ion conductivity of the lithium ion electrolyte is ensured; and the solid electrolyte of the solid electrolyte battery is prepared by the preparation methodof the solid electrolyte with the surface coating, and has the advantages of small interface impedance, high lithium ion conductivity and the like.

Description

technical field [0001] The invention relates to the field of solid-state electrolyte batteries, in particular to a method for preparing a solid-state electrolyte with a surface coating and a solid-state electrolyte battery. Background technique [0002] Among all energy conversion and storage systems, batteries are one of the most convenient devices for efficient energy utilization. With the development of lithium-ion battery technology, lithium-ion batteries have been widely used in 3C products, electric vehicles and other fields. At present, lithium-ion batteries still have disadvantages such as low energy density, poor safety, and short life. [0003] When the negative electrode of the battery is replaced by metal lithium, because metal lithium has the lowest electrochemical potential (-3.04V) and a maximum of 3861mAh g -1 The mass-to-capacity ratio will greatly increase the energy density of the battery, but at the same time it will face the problem of lithium dendrite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 赵瑞瑞范弘扬蓝威杰韦福鑫陈红雨
Owner SOUTH CHINA NORMAL UNIVERSITY
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