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Composite high-nickel ternary positive electrode material and preparation method thereof

A positive electrode material, high nickel technology, applied in the field of composite high nickel ternary positive electrode material and its preparation, can solve the problem of not being able to significantly improve the cycle stability of high nickel ternary positive electrode material, to improve poor cycle stability and reduce residual alkali content, pH-lowering effect

Inactive Publication Date: 2021-01-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single metal oxide coating still cannot significantly improve the cycle stability of high-nickel ternary cathode materials

Method used

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  • Composite high-nickel ternary positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0027] A kind of composite high-nickel ternary cathode material, made of LiNi 0.8 co 0.1 mn 0.1 o 2 Material, coated in LiNi 0.8 co 0.1 mn 0.1 o 2 Al on material surface 2 o 3 and coated in Al 2 o 3 The surface is composed of α-alkenyl sulfonates, where Al 2 o 3 with LiNi 0.8 co 0.1 mn 0.1 o 2 The mass ratio of materials is 1:1000, α-alkenyl sulfonate and LiNi 0.8 co 0.1 mn 0.1 o 2 The mass ratio of materials is 1:1000.

[0028] The preparation method of the above-mentioned composite high-nickel ternary positive electrode material comprises the following steps:

[0029] S1, change the chemical formula to Ni 0.8 co 0.1 mn 0.1 (OH) 2 High nickel ternary precursors, LiOH and Al 2 o 3 Mix for 20 minutes under the condition of 500r / min to obtain a precursor mixture, wherein the ratio of the total amount of metal ions in the high-nickel ternary precursor to the amount of lithium ions in LiOH is 1:1.01;

[0030] S2. Calcining the precursor mixture once in a...

Embodiment 2

[0034] A composite high-nickel ternary positive electrode material consisting of LiNi 0.85 co 0.1 mn 0.05 o 2 Material, coated in LiNi 0.85 co 0.1 mn 0.05 o 2 ZrO on the material surface 2 and coated in ZrO 2 The surface is composed of N,N-dimethylpyrrolidine methanesulfonate, in which ZrO 2 with LiNi 0.85 co 0.1 mn 0.05 o 2 The mass ratio of the material is 3:1000, N,N-dimethylpyrrolidine methanesulfonate and LiNi 0.85 co 0.1 mn 0.05 o 2 The mass ratio of materials is 3:1000.

[0035] The preparation method of the above-mentioned composite high-nickel ternary positive electrode material comprises the following steps:

[0036] S1, change the chemical formula to Ni 0.85 co 0.1 mn 0.05 (OH)2 High nickel ternary precursors, Li0H and ZrO 2 Mix at 500r / min for 20min to obtain a precursor mixture, wherein the ratio of the total amount of metal ions in the high-nickel ternary precursor to the amount of lithium ions in the lithium source is 1:1.03;

[0037] S2. C...

Embodiment 3

[0041] A kind of composite high-nickel ternary cathode material, made of LiNi 0.9 co 0.05 mn 0.05 o 2 Material, coated in LiNi 0.9 co 0.05 mn 0.05 o 2 TiO on material surface 2 and coated in TiO 2 The fatty acid methyl ester sulfonate on the surface is composed of TiO 2 with LiNi 0.9 co 0.05 mn 0.05 o 2 The mass ratio of materials is 5:1000, fatty acid methyl ester sulfonate and LiNi 0.9 co 0.05 mn 0.05 o 2 The mass ratio of materials is 5:1000.

[0042] The preparation method of the above-mentioned composite high-nickel ternary positive electrode material comprises the following steps:

[0043] S1, change the chemical formula to Ni 0.9 co 0.05 mn 0.05 (OH) 2 High nickel ternary precursors, Li0H and TiO 2 Mix at 500r / min for 20min to obtain the precursor mixture;

[0044] S2. Calcining the precursor mixture once in a high-purity oxygen atmosphere with an oxygen concentration ≥ 96% to obtain a calcined product, wherein the temperature of the first calcini...

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Abstract

The invention discloses a composite high-nickel ternary positive electrode material and a preparation method thereof. The composite high-nickel ternary positive electrode material is composed of a high-nickel ternary positive electrode material, a metal oxide coating the surface of the high-nickel ternary positive electrode material and sulfonate coating the surface of the metal oxide. The problemthat the high-nickel ternary material is poor in cycling stability all the time is effectively solved, meanwhile, the coating treatment process is relatively simple, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a composite high-nickel ternary cathode material and a preparation method thereof. Background technique [0002] High nickel ternary cathode material generally refers to Ni x co y mn 1-x-y (OH) 2 (x≥0.8), mainly contains Ni, Mn, and Co. The higher the content of Ni element, the higher the capacity of the material, but the stability of the corresponding material is also worse, especially the material / electrolyte interface The stability will be correspondingly reduced, which will lead to the occurrence of side reactions and affect the cycle stability of the material. This is also an important reason why high-nickel ternary materials, especially NMC811 materials, have not yet been popularized. Surface coating is a commonly used method to improve the stability of the material interface. Common coating materials include MgO, Al 2 o 3 、TiO 2 , SiO 2 ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/42H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/4235H01M10/0525Y02E60/10
Inventor 张小健李坤薛兵
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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