Lithium battery positive electrode material, preparation method thereof and all-solid-state lithium battery

A technology for positive electrode materials and positive electrode active materials, which is applied in the field of all-solid lithium batteries, lithium battery positive electrode materials and their preparation, and can solve problems such as high-temperature reactions between solid electrolytes and positive electrode active materials

Active Publication Date: 2020-10-30
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problem of high-temperature reaction between the solid-state electrolyte and the positive electrode active material in the preparation of the all-solid-stat

Method used

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  • Lithium battery positive electrode material, preparation method thereof and all-solid-state lithium battery
  • Lithium battery positive electrode material, preparation method thereof and all-solid-state lithium battery
  • Lithium battery positive electrode material, preparation method thereof and all-solid-state lithium battery

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preparation example Construction

[0042] In a second aspect, the present invention provides a method for preparing the above-mentioned positive electrode material for a lithium battery, comprising the following steps:

[0043] 1) Preparation of sol: Al(NO 3 ) 3 Aqueous solution, adding one or more of basic compounds such as ammonia water, sodium hydroxide, potassium hydroxide and other basic compounds to adjust the pH to 7.5-10.8 to obtain hydrated alumina sol;

[0044] 2) Preparation of positive electrode material precursor: The molar ratio of lithium source, positive electrode active material and sol obtained in step (1) is 1-x: 5+y / 3 (0≤x≤0.1, 0≤y≤x ) to mix, heat to 60-80°C, and add positive electrode active material after it is uniformly dispersed, wherein, the molar ratio of lithium source to positive electrode active material is (0.0003-0.1):1, and stir at 60-80°C for 1 -24h, and dry at 80-150°C for use to obtain the precursor of the positive electrode material;

[0045] 3) Preparation of positive el...

Embodiment 1

[0064] The active material is LiCoO 2 , coated in LiCoO 2 The material on the particle surface is LiAlO 2 and LiAl 5 o 8 , where LiCoO 2 with LiAlO 2 and LiAl 5 o 8 The mass ratio is 100:8:3;

[0065] The specific synthesis method is:

[0066] 1) Preparation of sol: use 100mL H 2 O dissolves 32.51g Al(NO 3 ) 3 , Place the solution in a three-necked flask, slowly add ammonia water drop by drop while stirring, the end point of the addition is pH=8. After the dropwise addition, the solution gradually became a milky white suspension, and the colloid obtained after the suspension was filtered and washed was hydrated alumina sol (30wt% Al 3+ );

[0067] 2) Preparation of cathode material precursor: take 10g LiCoO 2 , 1.590 g of the hydrated alumina sol prepared above, 0.317 g of lithium hydroxide and 50 mL of ethanol were put into a three-necked flask, placed in a water bath at 80°C for condensing and reflux for 5 hours, filtered and washed the precipitate, and dried f...

Embodiment 2

[0072] The active material is LiNi 0.8 co 0.1 mn 0.1 o 2 , coated in LiNi 0.8 co 0.1 mn 0.1 o 2 The material on the particle surface is LiAlO 2 and Li 0.517 Al 5.161 o 8 , where LiCoO 2 with LiAlO 2 and Li 0.517 Al 5.161 o 8 The mass ratio is 100:8:3;

[0073] The specific synthesis method is:

[0074] 1) Sol preparation: use 100mL H 2 O dissolves 32.51g Al(NO 3 ) 3 , Place the solution in a three-necked flask, slowly add ammonia water drop by drop while stirring, the end point of the addition is pH=8. After the dropwise addition, the solution gradually became a milky white suspension. The colloid obtained after suction filtration and washing of the suspension is the hydrated alumina sol (30wt% Al 3+ );

[0075] 2) Preparation of cathode material precursor: take 10g LiNi 0.8 co 0.1 mn 0.1 o 2 1.605 g of the hydrated alumina sol prepared above, 0.304 g of lithium hydroxide and 50 mL of ethanol were put into a three-necked flask, and placed in a water b...

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Abstract

The invention provides a lithium battery positive electrode material, which comprises a positive electrode active material and a coating layer coating the surface of the positive electrode active material, wherein the coating layer contains Li<1-x>Al<5+y/3>O<8-x+y> (x is greater than or equal to 0 and less than or equal to 1, and y is greater than or equal to 0 and less than or equal to x), and the mass ratio of the coating layer in the positive electrode material is 0.1%-50%. The positive electrode material provided by the invention does not react with the solid electrolyte LATP at a high temperature, so that the capacity of the positive electrode active material can be normally exerted, and the prepared all-solid-state battery has very good battery performance.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a lithium battery cathode material, a preparation method thereof, and an all-solid lithium battery. Background technique [0002] Traditional lithium-ion batteries use organic liquids as electrolytes for the transmission of lithium ions, but problems such as liquid leakage and flatulence are prone to occur, and in severe cases, the batteries may even burn and explode, making the batteries a potential safety hazard. All-solid-state lithium batteries use all-solid-state electrolytes to replace the diaphragm and electrolyte in traditional batteries for the transmission of lithium ions, which is safer than organic electrolytes. At the same time, after using an all-solid electrolyte, metal lithium can be used as the negative electrode, which can also increase the energy density of the battery. [0003] Solid electrolytes can be divided into two types, one is organic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0562
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0562Y02E60/10
Inventor 李世彩韩晓燕焦晓朋甘永青宋威
Owner BYD CO LTD
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