Solid electrolyte of lithium ion battery and preparation method of solid electrolyte as well as lithium ion battery

A solid-state electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as narrow electrochemical window of solid-state electrolytes

Active Publication Date: 2018-02-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is in order to solve Li in the prior art 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 To solve the technical problem of narrow electrochem

Method used

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  • Solid electrolyte of lithium ion battery and preparation method of solid electrolyte as well as lithium ion battery
  • Solid electrolyte of lithium ion battery and preparation method of solid electrolyte as well as lithium ion battery

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preparation example Construction

[0022] The present invention also provides a method for preparing the above-mentioned solid electrolyte, the steps of which include:

[0023] S1. Obtain the core material, the core material includes 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;

[0024] S2. Mix the core material with a solution containing the lithium source of the shell, the phosphate salt of the shell, the silicon source and the boron source, adjust the pH value to 8-11, and dry to obtain the precursor material. The solution used to adjust the pH value is generally ammonia water, so that the solution is gel-like coated on the outer surface of the core material, and then dried to obtain the precursor material. When mixing the solution containing the lithium source of the outer shell, the phosphate salt of the outer shell, the source of silicon and the boron source with the core material, the relative content of the two can be varied withi...

Embodiment 1

[0045] This example is used to illustrate the solid electrolyte disclosed in the present invention and its preparation method.

[0046] 1. Weigh 2.10gLi respectively 2 CO 3 Powder, 0.26g Al 2 o 3 Powder, 7.86g TiO 2 powder and 17.86gNH 4 h 2 PO 4 , ball milled and mixed evenly.

[0047] 2. Put the uniformly mixed powder in step 1 into an alumina crucible, and then place it in a muffle furnace for preliminary 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.

[0048] 3. Weigh 0.07g LiOH, 0.18g H 3 BO 3 , 0.34g NH 4 h 2 PO 4 and 0.15g ethyl orthosilicate were dispersed in deionized water to form an aqueous solution, and 20g of the above-prepared Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 Inner core material powder, vigorously stir evenly, and adjust the pH value of the system to 11 with 2mol / L ammonia water to form a uniform gel coated on Li 1.1 al ...

Embodiment 2

[0051] This example is used to illustrate the solid electrolyte disclosed in the present invention and its preparation method.

[0052] The solid electrolyte sheet A2 was prepared by the same method steps as in Example 1. The difference lies in weighing 2.07gLi 2 CO 3 Powder, 0.57g Y 2 o 3 Powder, 7.73g TiO 2 powder and 17.58g NH 4 h 2 PO 4 Made Li 1.1 Y 0.1 Ti 1.9 (PO 4 ) 3 The core material powder has an average particle diameter of 5 μm. Add 20g of the above-prepared Li to the aqueous solution 1.1 Y 0.1 Ti 1.9 (PO 4 ) 3 The thickness of the shell material formed by the core material powder is 25nm.

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Abstract

The invention provides solid electrolyte of a lithium ion battery and a preparation method of the solid electrolyte as well as the lithium ion battery. The solid electrolyte of the lithium ion batterycomprises a core material and a shell material coating the outer surface of the core material; the core material comprises Li1+xMxTi2-x(PO4)3, wherein M is selected from at least one of Al, La, Cr, Ga, Y or In, and 0.05fx f0.4; the shell material comprises Li0.6+yB0.8SiyP1-yO4, wherein 0.01fy f0.5; the Li 0.6+yB0.8SiyP1-yO4 shell material makes full surface contact with the core material, so thatthe ability of resistance between grains of the core material is obviously reduced; in addition, the solid electrolyte of the lithium ion battery has lower electronic conductivity and a complete anddense electronic shielding layer is formed on the surface of the core material, so that the problem that Ti<4+> is reduced into Ti<3+> is better solved. The prepared solid electrolyte has the characteristics of a wide electrochemical window (the electrochemical window is greater than 5V), relatively-high ionic conductivity and low electronic conductivity.

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 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...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 易观贵马永军郭姿珠谢静宋威历彪
Owner BYD CO LTD
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