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Solid electrolyte for lithium ion battery, preparation method for solid electrolyte, and lithium ion battery

A solid electrolyte, lithium-ion battery technology, applied in the manufacture of solid electrolyte, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problems of high grain boundary resistance and poor compatibility, improve performance and reduce inter-grain resistance. , Optimize the effect of interface contact

Inactive Publication Date: 2015-09-30
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of high grain boundary resistance between solid particles and poor compatibility with electrode materials in the existing lithium-ion battery solid electrolyte, and provides a method that can effectively improve the ion transport capacity of the solid electrolyte interface layer, Optimizing and improving the interfacial contact between electrodes and electrolytes, improving the performance of all-solid-state lithium-ion batteries, lithium-ion battery solid electrolytes, preparation methods thereof, and lithium-ion batteries

Method used

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  • Solid electrolyte for lithium ion battery, preparation method for solid electrolyte, and lithium ion battery
  • Solid electrolyte for lithium ion battery, preparation method for solid electrolyte, and lithium ion battery

Examples

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preparation example Construction

[0022] The present invention also provides the preparation method of described lithium-ion battery solid electrolyte, and this method comprises the following steps:

[0023] S1. Preparation of Li 1+x m x Zr 2-x (PO 4 ) 3 , the ZrO 2 , M 2 o 3 , NH 4 h 2 PO 4 It is mixed with lithium source compound by ball milling and then calcined for the first time. After cooling, Li 1+x m x Zr 2-x (PO 4 ) 3 Powder;

[0024] S2, the raw material of shell material is dissolved in water, then adds to Li 1+x m x Zr 2-x (PO 4 ) 3 In the powder, stir and adjust the pH of the system to 8-11, so that the shell material forms a gel and coats the Li 1+x m x Zr 2-x (PO 4 ) 3 On the powder particles, after drying, a composite material with a core-shell structure is obtained;

[0025] S3. Compressing the composite material obtained in step S2, then performing a second calcination, and obtaining a lithium-ion electrolyte solid electrolyte after cooling.

[0026] According to the...

Embodiment 1

[0037] (1) According to the core composition of the core-shell structure material is Li 1.1 Y 0.1 Zr 1.9 (PO 4 ) 3 The stoichiometric ratio, respectively weighed Li 2 CO 3 powder, Y 2 o 3 powder, ZrO 2 Powder and NH 4 h 2 PO 4 , ball milled and mixed evenly;

[0038] (2) Put the homogeneously mixed powder in step (1) into an alumina crucible, then place it in a muffle furnace for calcination at 800°C for 6 hours, and obtain Li 1.1 Y 0.1 Zr 1.9 (PO 4 ) 3 Powder;

[0039] (3) According to the shell composition Li 0.15 B 0.95 PO 4 Accounting for 2wt% of the total mass of the solid electrolyte, weigh the required LiOH, H 3 BO 3 and NH 4 h 2 PO 4 Dissolve in deionized water, add the corresponding mass of Li 1.1 Y 0.1 Zr 1.9 (PO 4 ) 3 powder, vigorously stir evenly, and adjust the pH value of the system to make Li 0.15 B 0.95 PO 4 Form a homogeneous gel coated on the Li 1.1 Y 0.1 Zr 1.9 (PO 4 ) 3 On the powder particles, the mixed powder is drie...

Embodiment 2

[0042] (1) According to the core composition of the core-shell structure material is Li 1.1 Al 0.1 Zr 1.9 (PO 4 ) 3 The stoichiometric ratio, respectively weighed Li 2 CO 3 Powder, Al 2 o 3 powder, ZrO 2 Powder and NH 4 h 2 PO 4 , ball milled and mixed evenly;

[0043] (2) The desired lithium ion solid electrolyte sheet A2 was obtained by the same treatment method as in steps (2) to (4) of Example 1.

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Abstract

A solid electrolyte contains an internal component and an external component coated on a surface of the internal component. The internal component is represented by a formula Li1+xMxZr2-x(PO4)3, M is one or more elements selected from a group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4. The external component contains a plastic deformable material and has a conductivity of about 10-7 S / cm to about 10-5 S / cm. A method of preparing the solid electrolyte and a lithium ion battery including the solid electrolyte are also provided.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a lithium-ion battery solid electrolyte, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in the field of consumer electronics and electric vehicles due to their advantages such as high energy efficiency density, good recharging performance, and low loss in use. At present, high-energy-efficiency and high-density chemical batteries are generally realized by organic liquid electrolytes, and liquid electrolytes have problems such as volatile, flammable, and leaking corrosion. Complicated and expensive. Although the gel polymer electrolyte combines the high safety of solid electrolytes with the high conductivity and rate performance of liquid electrolytes, which solves the safety problem of lithium-ion batteries to a certain extent, but still uses liquid organic solvents as plasticizers, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058C01B25/45C01B35/143C04B35/447C04B35/62805C04B35/62886C04B2235/3203C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3241C04B2235/3244C04B2235/3286C04B2235/3409C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/602C04B2235/6562H01M2300/0068H01M2300/0094Y02E60/10Y02P70/50C04B35/62615C04B35/64B28B3/00Y02T10/70
Inventor 易观贵马永军郭姿珠
Owner BYD CO LTD
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