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Boron-yttrium composite coated high-nickel positive electrode material and preparation method thereof

A cathode material, high nickel technology, applied in the field of ternary cathode materials for lithium ion batteries, can solve the problems of difficult to guarantee coating uniformity, cycle performance limitations, etc., to reduce interface reactions, improve overall performance, and good conductivity.

Inactive Publication Date: 2021-02-23
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yttrium oxide is a commonly used ceramic additive material, which can be used as a coating agent for positive electrode materials, but the improvement of cycle performance is limited by coating with single yttrium oxide, and the uniformity of coating is difficult to guarantee

Method used

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  • Boron-yttrium composite coated high-nickel positive electrode material and preparation method thereof
  • Boron-yttrium composite coated high-nickel positive electrode material and preparation method thereof
  • Boron-yttrium composite coated high-nickel positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Weigh a certain mass of LiNi x co y m 1-x-y o 2 Precursor, the molecular formula is Ni 0.83 co 0.11 mn 0.06 (OH) 2 , mixed lithium hydroxide (LiOH·H 2 O) then carry out a sintering under an oxygen atmosphere to obtain LiNi 0.83 co 0.11 mn 0.06 o 2 A sintered finished product. The molar ratio of the precursor to lithium hydroxide is 1:1, the sintering temperature is 780°C, the holding time is 10h, and the oxygen content is >90%.

[0028] Step 2: Weigh a certain mass of LiNi 0.83 co 0.11 mn 0.06 o 2 The first sintered finished product is added to deionized water according to the mass ratio of water to material 3:1 for stirring and washing. The stirring and washing time is 15 minutes, and the stirring linear speed is 900rmp; LiNi 0.83 co 0.11 mn 0.06 o 2 matrix cathode material.

[0029] Step 3: The base positive electrode material and the coating agent boric acid-yttrium oxide are mixed by ball milling, wherein boric acid accounts for 0.68wt% ...

Embodiment 2

[0032] Step 1: Weigh a certain mass of LiNi x co y m 1-x-y o 2 Precursor, the molecular formula is Ni 0.88 co 0.09 mn 0.03 (OH) 2 , mixed lithium hydroxide (LiOH·H 2 O) then carry out a sintering under an oxygen atmosphere to obtain LiNi 0.88 co 0.09 mn 0.03 o 2 A sintered finished product. The molar ratio of the precursor to lithium hydroxide is 1:1.05, the sintering temperature is 730°C, the holding time is 12h, and the oxygen content is >90%.

[0033] Step 2: Weigh a certain mass of LiNi 0.88 co 0.09 mn 0.03 o 2 The finished product is sintered again and again, according to the mass ratio of water to material 2:1, it is added into deionized water for stirring and washing. The washing time is 30 minutes, and the stirring line speed is 900rmp. 0.88 co 0.09 mn 0.03 o 2 matrix cathode material.

[0034] Step 3: mix the base positive electrode material and the coating agent boric acid-yttrium oxide by ball milling, wherein boric acid accounts for 0.51wt% by w...

Embodiment 3

[0037] Step 1: Weigh a certain mass of LiNi x co y m 1-x-y o 2 Precursor, the molecular formula is Ni 0.91 co 0.06 Al 0.03 (OH) 2 , mixed lithium hydroxide (LiOH·H 2 O) then carry out a sintering under an oxygen atmosphere to obtain LiNi 0.91 co 0.06 Al 0.03 o 2 A sintered finished product. The molar ratio of the precursor to lithium hydroxide is 1:1.02, the sintering temperature is 710°C, the holding time is 12h, and the oxygen content is >90%.

[0038] Step 2: Weigh a certain mass of LiNi 0.91 co 0.06 Al 0.03 o 2 Once the finished product is sintered, it is added into deionized water according to the mass ratio of water to material 1.5:1 for stirring and washing, the washing time is 30min, and the stirring line speed is 900rmp; after washing, it is separated by suction filtration, and dried at 120°C for 8h to obtain LiNi 0.91 co 0.06 Al 0.03 o 2 matrix cathode material.

[0039] Step 3: The base positive electrode material and the coating agent boric acid...

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Abstract

The invention discloses a boron-yttrium composite coated high-nickel positive electrode material and a preparation method thereof. The boron-yttrium composite coated high-nickel positive electrode material comprises a matrix positive electrode material and a boron-yttrium composite coating layer coated on the matrix positive electrode material, and the molecular formula of the matrix positive electrode material is LiNixCoyM1-x-yO2, wherein 0.80 <= x <= 0.96, 0.00 <= y <= 0.11, and x+y <= 1, M is one of Al, Mn, W and Mg, and the boron-yttrium composite coating layer comprises yttrium oxide anda lithium compound layer containing boric acid. According to the present invention, the boric acid and yttrium oxide are used as coating agents, and the coating layer material is uniformly distributedon the surface of the matrix positive electrode material by virtue of a synergistic effect generated by the excellent flowability of boric acid and the excellent chemical stability of yttrium oxide,so that the interface reaction between the electrolyte and the positive electrode material can be effectively reduced, the cycling performance of the positive electrode material is significantly improved, and the cycling life of the battery is prolonged. Moreover, the coated product has good conductivity, and the battery discharge capacity can be improved.

Description

technical field [0001] The invention belongs to the technical field of ternary positive electrode materials for lithium ion batteries, and in particular relates to a boron-yttrium composite-coated high-nickel positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the vigorous promotion and application development of new energy vehicles, lithium-ion batteries have been widely used in the power system of electric vehicles and hybrid vehicles due to their advantages of low cost, high energy density, and environmental friendliness. The performance of lithium-ion batteries mainly depends on the cathode material. Among many cathode materials, layered high-nickel cathode materials have received extensive attention and research because of their high energy density and good thermal stability. However, this material has greatly limited its commercialization and practical application due to some defects. For example, a high Ni...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M4/04H01M10/0525
CPCH01M4/0471H01M4/366H01M4/485H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 徐可寇亮张诚张超刘增田占元
Owner SHAANXI COAL & CHEM TECH INST