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

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, and electrode manufacturing. It can solve the problems of electrolyte reaction and insufficient density of the coating layer, and achieve the reduction of residual alkali, inhibition of structural phase transition and unit cell The effect of expansion and contraction and shortening of the diffusion path

Inactive Publication Date: 2021-10-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating layer is still not dense enough, so that part of the electrolyte will still react with the positive electrode material

Method used

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

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preparation example Construction

[0037] A second aspect of the invention provides a method of preparing a positive electrode material as described in the first aspect of the invention, comprising the steps of:

[0038] After mixing nickel cobalt manganese precursors, Zr dopants, and lithium sources in accordance with the chemical metering, the first sintering is performed, and the Zr doped matrix material is performed;

[0039] Base material to the Zr doped 3 BO 3 And Al 2 O 3 After mixing well, the second sintering was performed, and Zr doped B / Al co-coated dual-altered nickel-cobalt-oxanate lithium single crystal positive electrode material was obtained.

[0040] Further, the first sintering process is specifically: after 440-500 ° C for 5-8 hours, it is raised to 900-950 ° C, and the insulation is 15-18 h; in one or more embodiments of the present invention, The heating rate is constant, preferably, the temperature rise rate is 5 ° C / min, and the first sintering is carried out in an atmosphere filled with ...

Embodiment 1

[0046] Preparation of Zr doped matrix materials

[0047] 100g Ni 0.75 CO 0.125 Mn 0.125 (OH) 2 Precursor, 0.1% doped amount of Zro 2 And lithium hydroxide is added to the high-speed mixing machine, which is mixed well, wherein the lithium hydroxide and nickel-cobalt manganese precursors are added in accordance with molar ratio li: me = 1.05: 1; the mixed uniform material is placed in an oxygen atmosphere of 99.9%. The first sintering was performed, first warmed up to 480 ° C for 5 hours at a speed of 5 ° C / min, then continued to heat up at 5 ° C / min to heat the temperature for 15 h, naturally cooling and cooling, pulverized, over 300 mesh sieve, obtained Zr doped matrix material.

[0048] Preparation of modified nickel cobalt manganese three yuan single crystal positive electrode material

[0049] It is called H. 3 BO 3 Alone 2 O 3 After mixing is uniform, the second sintering is carried out under the oxygen atmosphere, and the temperature is warmed to 400 ° C for 6 h under ...

Embodiment 2

[0069] Preparation of Zr doped matrix materials

[0070] 100g Ni 0.75 CO 0.125 Mn 0.125 (OH) 2 Precursor, 0.15% doped amounts of zirconium hydroxide and lithium nitrate to add a high-speed mixing machine, wherein the lithium hydroxide and nickel-cobalt precursor are added in accordance with molar ratio Li: ME = 1.02: 1; The uniform material was placed under the conditions of the oxygen atmosphere of 99.9% for the first sintering, first warmed up to 440 ° C at a speed of 5 ° C / min, then continued to heat up at 5 ° C / min to heat the temperature for 16 h, natural Cooling cooling, pulverizing, over 300 mesh sieve, and obtaining a Zr doped matrix material.

[0071] Preparation of modified nickel cobalt manganese three yuan single crystal positive electrode material

[0072] It is called H with a 100 g of Zr doped matrix material and coating amount of 0.5 ‰ 3 BO 3 Alone 2 O 3 After mixing is uniform, the second sintering is carried out under the oxygen atmosphere, and the temperat...

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Abstract

The invention discloses a positive electrode material and a preparation method thereof, a lithium ion battery positive electrode and a lithium ion battery, the positive electrode material comprises nickel cobalt lithium manganate doped with Zr element and a coating layer formed on the surface of the nickel cobalt lithium manganate, wherein the coating layer is composed of H3BO3 and Al2O3. The obtained positive electrode material is small in particle size and compact in coating layer, and can effectively improve the electrochemical stability and cycle performance of the lithium ion battery, reduce residual alkali, reduce flatulence and improve the comprehensive performance of the lithium ion battery.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion battery positive electrode material, and more particularly to a lithium-modified nickel-cobalt-manganese acid lithium-based single crystal positive electrode material and the preparation method thereof, further involves a positive electrode of a lithium ion battery containing the positive electrode material, and containing the lithium ion. Lithium ion battery of the battery positive. Background technique [0002] With the continuous development of the new energy industry, people's requirements for battery life have become higher and higher. The positive electrode material is one of the key materials of the lithium ion battery, and its performance directly affects the final comprehensive performance of the lithium ion battery. [0003] Lithium cobaltate is one of the most widely used battery materials, but cobalt resources are growing, and the price is expensive, and the lithium cobaltate ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/36H01M4/62H01M4/131H01M4/04H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/131H01M4/628H01M4/0471H01M10/0525H01M2004/028Y02E60/10
Inventor 秦飞刘星佟明兴
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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