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Positive electrode material, positive electrode sheet and preparation method thereof, lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as reactions, and achieve excellent performance and optimize battery performance.

Active Publication Date: 2022-04-19
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a positive electrode material, a positive electrode sheet and a preparation method thereof, and a lithium-ion battery, so as to solve the problem that the solid electrolyte in the prior art will react with the positive electrode active material

Method used

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  • Positive electrode material, positive electrode sheet and preparation method thereof, lithium ion battery
  • Positive electrode material, positive electrode sheet and preparation method thereof, lithium ion battery

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preparation example Construction

[0041] The present application provides a method for preparing a positive electrode sheet 3, using the above-mentioned preparation method to prepare a positive electrode material, and then mixing the positive electrode material, a conductive agent, a binder and an electrolyte in a solvent to form a slurry; The slurry is coated on the surface, fully dried and rolled to form the positive electrode sheet 3 . Wherein, the mass proportion of the positive electrode material is 60% to 80%, the mass proportion of the conductive agent and the binder is 2% to 10%, and the mass proportion of the electrolyte is 5% to 25%; for example, 75: 5:5:15; and / or, the conductive agent includes a mixture of one or more of carbon black, acetylene black, carbon nanotubes, and vapor-grown carbon fibers; the binder includes polyvinylidene fluoride ; The base material is aluminum foil; The solvent includes N-methylpyrrolidone; The electrolyte includes LiX, Li 2 S and P 2 S 5 , X is O, I, Cl or F; pref...

Embodiment 1

[0050] The present embodiment provides a kind of preparation method of lithium-ion battery, and it comprises the steps:

[0051] (1) Preparation of positive electrode material: LiNi x co y mn z o 2 and TiNb 2 o 7 Mix according to the mass ratio of 8.5:1.5, put into a ball mill, and ball mill for 6 hours to obtain the positive electrode material.

[0052] (2) Preparation of electrolyte: Li 2 O. Li 2 S and P 2 S 5 Mix according to the ratio of mass ratio of 10:68:22,

[0053] (3) Preparation of positive electrode sheet 3: carbon black and carbon nanotubes are mixed according to the mass ratio of 5:5 to form a conductive agent, and the positive electrode material, conductive agent, polyvinylidene fluoride, and electrolyte are mixed according to the mass ratio of 75:5:5 The ratio of :15 is evenly mixed in N-methylpyrrolidone to form a slurry, which is coated on an aluminum foil, fully dried and rolled to form the positive electrode sheet 3.

[0054] (4) Preparation of n...

Embodiment 2

[0058] The present embodiment provides a kind of preparation method of lithium-ion battery, and it comprises the steps:

[0059] (1) Preparation of positive electrode material: LiNi 0.5 co 0.2 mn 0.3 o 2 and Li 2 Nb 2 o 8 Mix according to the mass ratio of 8.5:1.5, put into a ball mill, and ball mill for 6 hours to obtain the positive electrode material.

[0060] (2) Preparation of electrolyte: LiCl, Li 2 S and P 2 S 5 Mix according to the mass ratio of 10:68:22 to obtain the electrolyte.

[0061] (3) Preparation of positive electrode sheet 3: carbon black and vapor-grown carbon fiber are mixed according to the mass ratio of 3:7 to form a conductive agent, and the positive electrode material, conductive agent, polyvinylidene fluoride, and electrolyte are mixed according to the mass ratio of 75:5:5 The ratio of :15 is evenly mixed in N-methylpyrrolidone to form a slurry, which is coated on an aluminum foil, fully dried and rolled to form the positive electrode sheet 3...

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Abstract

The invention discloses a positive electrode material, a positive electrode sheet, a preparation method thereof, and a lithium ion battery. The positive electrode material includes a positive electrode active material and a coating layer covering the positive electrode active material, and the coating layer is used to cover the positive electrode active material. The positive electrode active material is separated from the electrolyte in the positive electrode. The present invention prevents the positive electrode active material from reacting with the electrolyte in the positive electrode by providing a coating layer covering the positive electrode active material, and optimizes battery performance.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to a positive electrode material, a positive electrode sheet and a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of economic globalization, the consumption and waste of resources and energy are becoming more and more serious. The 21st century is not only an era of information automation and electronic technology, but also an era of increasingly depleted resources and deteriorating environment. Traditional lead-acid and nickel-metal hydride batteries have been difficult to meet market demand due to low energy density and environmental pollution. Therefore, developing high-performance lithium-ion batteries and seeking high-quality electrode materials have more strategic research significance today. [0003] There is a solid-state sulfide electrolyte used in solid-state batteries, but the method of directly as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/131H01M4/1391
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨国凯段宇马书良王世强申江超王树荣孟志远申博伦成信刚
Owner NORTHERN ALTAIR NANOTECH CO LTD