Solid electrolyte, preparation method thereof and lithium ion battery

A solid-state electrolyte, ionic conductivity technology, applied in the field of lithium-ion batteries, can solve problems such as narrow electrochemical window of solid-state electrolytes

Active Publication Date: 2017-01-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a solid e

Method used

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Examples

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preparation example Construction

[0028] At the same time, the present invention also provides a method for preparing the above-mentioned solid electrolyte, comprising the following steps:

[0029] S1. Obtain the core material, the core material has the following chemical formula: Li 1+x m x Ti 2-x (PO 4 ) 3 , wherein, M is selected from at least one of Al, La, Cr, Ga, Y or In, 0.05≤x≤0.4;

[0030] S2. Dissolving the shell lithium source, shell phosphate, fluorine source and boron source in water to form a shell raw material solution; in the shell raw material liquid, the element Li:B:P:F is 0.15-0.165 in terms of element molar content :0.95:(1-y):(3y), where, 0.01≤y≤0.5;

[0031] S3. Mix the core material with the shell raw material solution, adjust the pH value to 8-11, and obtain a precursor material after drying;

[0032] S4. Calcining the precursor material as a finished product, and obtaining the solid electrolyte after cooling. The solid electrolyte includes a core material and a shell material co...

Embodiment 1

[0062] This embodiment is used to illustrate the solid electrolyte disclosed in the present invention, its preparation method, and lithium ion battery.

[0063] 1. According to the core composition of the core-shell structure material is Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 The stoichiometric ratio, respectively weighed Li 2 CO 3 Powder, Al 2 o 3 Powder, TiO 2 Powder and NH 4 h 2 PO 4 , ball milled and mixed evenly.

[0064] 2. Put the uniformly mixed powder in step 1 into an alumina crucible, and then place it in a muffle furnace for calcination at 800°C for 6 hours. After cooling, the chemical formula is Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 The core material powder. Its average particle diameter is 5 μm.

[0065] 3. According to the composition Li of the shell material 0.15 B 0.95 (PO 4 ) 0.9 f 0.3 Accounting for 2wt% of the total mass of the solid electrolyte, weigh the required LiOH, H 3 BO 3 , NH 4 h 2 PO 4 and LiF were dissolved in deionized water, and th...

Embodiment 2

[0068] This embodiment is used to illustrate the solid electrolyte disclosed in the present invention, its preparation method, and lithium ion battery.

[0069] 1. According to the core composition of the core-shell structure material is Li 1.1 Y 0.1 Ti 1.9 (PO 4 ) 3 The stoichiometric ratio, respectively weighed Li 2 CO 3 Powder, Y 2 o 3 Powder, TiO 2 Powder and NH 4 h 2 PO 4 , ball milled and mixed evenly. A core material was prepared with an average particle diameter of 5 μm.

[0070] 2. According to the same treatment method as Steps 2-4 of Example 1, the desired solid electrolyte sheet A2 was obtained. Wherein, the thickness of the shell material is 25nm.

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Abstract

In order to solve the problem of narrow electrochemical window of a solid electrolyte in the prior art, the invention provides a solid electrolyte. The solid electrolyte comprises a core material and a shell material, wherein the shell material wraps the core material, the core material has the following chemical formula: Li(1+x)MxTi(2-x)(PO4)3, M is selected from at least one of Al, La, Cr, Ga, Y and In, x is more than or equal to 0.05 but less than or equal to 0.4, the ionic conductivity of the shell material is over 10<-6>S/cm, and the electrochemical window of the solid electrolyte is larger than 5 volts. Meanwhile, the invention also discloses a preparation method of the abovementioned solid electrolyte and a lithium ion battery applying the solid electrolyte. The solid electrolyte provided by the invention is wide in electrochemical window and high in the ionic conductivity.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a solid electrolyte, a preparation method thereof, and a lithium ion battery using the solid electrolyte. 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, but liquid electrolytes have problems such as volatile, flammable, and leaking corrosion. Multiple safety protection measures need to be added to the battery, making large-scale battery systems complex and difficult. 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 s...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525H01M50/403H01M50/431H01M50/497
CPCH01M10/0525H01M10/0562H01M10/058H01M50/431H01M50/497H01M50/403H01M10/052H01M2300/0094C01B25/45H01M2300/0071Y02E60/10Y02P70/50Y02T10/70H01M10/02H01M2300/0091
Inventor 易观贵马永军郭姿珠王向慧谢静
Owner BYD CO LTD
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