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A kind of solid electrolyte and its preparation method and lithium ion battery

A solid-state electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problem that the conductivity of non-thin-film lithium-ion batteries cannot be well met, and achieves the ability to reduce inter-granular resistance and high ionic conductivity. , the effect of low electronic conductivity

Active Publication Date: 2021-03-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it cannot meet the requirements of electrolyte conductivity for non-thin-film lithium-ion batteries.

Method used

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  • A kind of solid electrolyte and its preparation method and lithium ion battery

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preparation example Construction

[0051] The preparation method of the lithium-ion battery of the present invention can be various conventional preparation methods of the lithium-ion battery in the field, for example, a solid electrolyte, a positive electrode and a negative electrode can be assembled together to form a lithium-ion battery by a conventional method. In a specific embodiment of the present invention, the method for preparing a lithium ion battery may include: under the protection of an argon atmosphere, the solid electrolyte prepared above is polished to smooth on 800# sandpaper, and then ultrasonically treated in ethanol 10-30 minutes, and drying at 70-80° C. to obtain a solid electrolyte sheet with a clean surface. 1000g of positive electrode active material LiNi 0.5 mn 1.5 o 4 , 50-60g binder SBR, 30-40g acetylene black were added to 1500-1600g solvent anhydrous heptane, and then stirred in a vacuum mixer to form a stable and uniform positive electrode slurry. The positive electrode slurry ...

Embodiment 1

[0058] This example is used to illustrate the solid electrolyte of the present invention and its preparation method.

[0059] (1) 0.53g Li 2 CO 3 Powder, 8.70g TiO 2 powder and 11.19g La 2 o 3 The powder is ball milled in a planetary ball mill at a speed of 350 rpm for 12 hours to mix evenly, then the obtained mixture is put into an alumina crucible, and then placed in a muffle furnace for the first calcination at 1100°C for 6 hours, and then cooled to obtain the chemical formula: Li 0.12 La 0.63 TiO 3 The core material powder has an average particle size of 5 μm;

[0060] (2) 0.07g LiOH, 0.63g Y(NO 3 ) 3 ·6H 2 O, 0.27g NH 4 h 2 PO 4 Disperse 0.03g tetraethyl orthosilicate in deionized water to form an aqueous solution, then add 20g of the core material prepared in step (1) to the aqueous solution and mix evenly, then adjust the pH value of the mixed solution to 11 with 2mol / L ammonia water, to A gel-like uniform coating shell is formed on the surface of the core...

Embodiment 2

[0063] This example is used to illustrate the solid electrolyte of the present invention and its preparation method.

[0064] Prepare solid state electrolyte A2 and lithium ion battery according to the method for embodiment 1, difference is, adopt 0.80gLi 2 CO 3 Powder, 8.78g TiO 2 powder and 10.93g La 2 o 3 To obtain the structural formula as Li 0.18 La 0.61 TiO 3 The core material powder, the average particle diameter of the core material powder is 5 μm, then add 20g of the Li prepared above to the aqueous solution 0.18 La 0.61 TiO 3 The core material powder is observed with an electron microscope and the thickness of the shell material is 25nm.

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Abstract

The invention relates to the field of lithium ion batteries, and specifically relates to a solid electrolyte and a preparation method thereof, and a lithium ion battery. The solid electrolyte is of acore-shell structure; the core-shell structure comprises a core material and a shell material coated outside the core material; and the core material has a perovskite structure, and the shell materialcontains Li3+yY2SiyP3-yO12, wherein y is greater than or equal to 0.05 but less than or equal to 0.5. The invention further relates to the preparation method of the solid electrolyte. The invention further relates to the lithium iron battery, and the lithium ion battery includes a positive electrode, a negative electrode, and the solid electrolyte disposed between the positive electrode and the negative electrode. The solid electrolyte provided by the invention has a wide electrochemical window and a relatively high ionic conductivity, and has a wide application.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a 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, 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 safety problem of lithium-ion batteries t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525C01B25/45
CPCC01B25/45C01P2002/54H01M10/0525H01M10/0562Y02E60/10
Inventor 易观贵郭姿珠马永军历彪
Owner BYD CO LTD
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