Preparation method of solid electrolyte

A solid electrolyte and material technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems that affect battery energy density and low ion conductivity

Active Publication Date: 2021-01-19
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing sulfide solid electrolytes still have the problem of low ionic conductivity, which affects the energy density of the battery.

Method used

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  • Preparation method of solid electrolyte

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preparation example Construction

[0014] The preparation method of the solid electrolyte provided by the embodiment of the present application includes: dispersing the lithium precursor and the central atom ligand in an organic solvent to form a reaction initial mixture; dispersing the borate ester in an organic solvent to form a modified solution; The initial reaction mixture is mixed with the modified solution, and dried to obtain an initial product; the initial product is ground, cold-pressed, and heat-treated to obtain a solid electrolyte.

[0015] According to the embodiment of the present application, a B and O co-doped solid electrolyte can be obtained, wherein, B element doping can reduce the binding effect of anion on lithium ions, and improve the transport capacity of lithium ions; O element doping partially replaces S Elements can not only produce mixed anion effects to improve the conductivity of lithium ions, but also inhibit the formation of a space charge layer at the interface between the oxide ...

Embodiment 1

[0072] The data of Examples 1-5 and Comparative Example 1 show the influence of the amount of borate added on the performance of solid electrolyte and battery. Doping and modifying the sulfide solid-state electrolyte by adding boric acid ester (such as Examples 2, 3, and 4) in an appropriate amount can effectively improve the ionic conductivity and battery capacity of the solid-state electrolyte. But, when the addition of borate is too low (as in Example 1), although the conductivity of the solid electrolyte increases, the magnitude of the increase is small; and when the addition of borate is too high (as in Example 5 ), it will cause the concentration of lithium ions in the raw material to decrease, and the crystal structure of the electrolyte may also be affected, resulting in no further increase in conductivity. Thus considering the dual factors of cost and performance, in the embodiments of the present application, the addition amount of borate is in the following range: t...

Embodiment 7

[0074]Example 7 and Examples 10-13 show that in the steps of grinding, cold-pressing, and heat-treating the initial product to obtain a solid electrolyte, the cold-pressing pressure of the initial product can affect the performance of the solid electrolyte and battery. Specifically, the pressure of the cold pressing of the initial product will affect the diffusion process between elements during the high temperature heat treatment process. Structural formation and electrical conductivity promotion, although compared with comparative example conductivity to some extent, the magnitude of promotion is not large; and when the pressure is too large (as in Example 13), the block is easy to form severe cracking and is also unfavorable for product formation, Although the conductivity was increased compared to the comparative example, the performance improvement effect of Example 12 could not be achieved. Therefore, in the embodiments of the present application, the cold pressing step ...

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Abstract

The invention provides a preparation method of a solid electrolyte, which comprises the following steps: dispersing a lithium precursor and a central atom ligand in an organic solvent to form a reaction primary mixed solution; dispersing borate in an organic solvent to form a modified solution; mixing the reaction primary mixed solution with the modified solution, and drying to obtain an initial product; conducting grinding, cold pressing and heat treatment on the initial product to obtain the solid electrolyte. According to the preparation method provided by the invention, borate is used as adoping raw material to modify the sulfide solid electrolyte, and the B and O co-doped sulfide solid electrolyte can be obtained; in the doping modification process, sufficient mixing between the sulfide electrolyte raw material and borate is realized; the borate is completely decomposed at the phase-forming temperature of the sulfide electrolyte, so that the introduction of impurities or the residue of reactants is reduced, the ionic conductivity of the prepared sulfide solid electrolyte is remarkably improved, and the energy density of the all-solid-state battery is favorably exerted.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a method for preparing a solid electrolyte. Background technique [0002] In recent years, with the rapid development of consumer electronics and electric vehicles, lithium-ion batteries have become the most widely used secondary battery technology in social life. However, with the rapid increase in the number of lithium-ion battery products, negative news about lithium-ion batteries smoking, catching fire and even exploding is endless. The safety and energy density of lithium-ion batteries need to be improved. [0003] Traditional liquid lithium batteries are difficult to avoid battery safety accidents due to the volatile and flammable characteristics of liquid electrolytes. Therefore, solid electrolytes have attracted attention as an alternative product with higher safety performance. The existing solid electrolytes can be divided into three categories according to the mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0068C01B17/22Y02E60/10C01P2002/72C01P2002/82C01P2006/40H01M10/0525Y02P70/50H01M10/0585
Inventor 梁成都刘成勇胡波兵付佳玮李谦程萌郭永胜
Owner CONTEMPORARY AMPEREX TECH CO
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