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High-performance primary large-particle ternary positive electrode composite material, manufacturing method and application thereof

A composite material and cathode material technology, applied in the field of new energy materials, can solve problems such as poor conductivity, low capacity, and small primary particle size

Active Publication Date: 2020-01-21
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the primary particle size of this product is small, the capacity is low, and the conductivity is poor, which seriously affects the electrical properties of the material.

Method used

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  • High-performance primary large-particle ternary positive electrode composite material, manufacturing method and application thereof
  • High-performance primary large-particle ternary positive electrode composite material, manufacturing method and application thereof
  • High-performance primary large-particle ternary positive electrode composite material, manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A method for preparing a primary large-grain high-nickel ternary positive electrode material, the steps of which are as follows:

[0076] (1) Weigh 100g of Ni 0.88 co 0.09 al 0.03 (OH) 2 Precursor, Ni 0.88 co 0.09 al 0.03 (OH) 2 Precursor and LiOH are mixed in a molar ratio of 1:1.03, and sintered once at 700°C for 5 hours to obtain material A;

[0077] (2)Add H 3 BO 3 , so that H 3 BO 3 The addition amount of material A is 1000ppm, and wet high-energy ball milling, the dispersant is ethanol, the mixed material is ball milled to the nanometer level, and the secondary sintering is carried out at 850°C for 10 hours to obtain a primary large-particle high-nickel ternary positive electrode Material B, its primary particle size is about 5 μm;

[0078] (3) Add nano-sulfur so that the amount of nano-sulfur relative to material B is 500ppm, mix and ball mill at 200r / min for 2h and sinter and coat at 200°C to obtain material C;

[0079](4) Hydrophobic sodium alkylbe...

Embodiment 2

[0083] A method for preparing a primary large-grain high-nickel ternary positive electrode material, the steps of which are as follows:

[0084] (1) Weigh 100g of Ni 0.88 co 0.09 al 0.03 (OH) 2 Precursor, Ni 0.88 co 0.09 al 0.03 (OH) 2 Precursor and LiOH are mixed in a molar ratio of 1:1.05, and sintered once at 700°C for 5 hours to obtain material A;

[0085] (2) Add 1500ppm of ZrO to material A 2 And wet high-energy ball milling, the dispersant is ethanol, the mixed material is ball-milled to the nanometer level, and the secondary sintering is carried out at 850 ° C for 10 hours to obtain the primary large-particle high-nickel ternary positive electrode material B, and the primary particle size is about 6 μm ;

[0086] (3) Add 1000ppm of nano-sulfur to material B, mix and ball mill it at 200r / min for 1 hour, and sinter and coat at 200°C to obtain material C;

[0087] (4) 1000ppm hydrophobic alkylbenzene sulfonate is added to the aqueous solution of PEDOT-PSS contai...

Embodiment 3

[0091] A method for preparing a primary large-grain high-nickel ternary positive electrode material, the steps of which are as follows:

[0092] (1) Weigh 200g of Ni 0.8 m 0.2 (OH) 2 Precursor, Ni 0.8 m 0.2 (OH) 2 The precursor and LiOH are mixed in a molar ratio of 1:1.12, and sintered at 750°C for 3 hours to obtain material A;

[0093] (2)Add H 3 BO 3 , so that H 3 BO 3 The amount of addition of material A is 2500ppm, and wet high-energy ball milling, the dispersant is ethanol, ball milling the mixed material to the nanometer level and performing secondary sintering at 950°C for 5 hours to obtain a primary large-particle high-nickel ternary positive electrode Material B, its primary particle size is about 7 μm;

[0094] (3) Add nano-sulfur so that the amount of nano-sulfur relative to material B is 2000ppm, mix and ball mill at 300r / min for 1h and sinter and coat at 300°C to obtain material C;

[0095] (4) Hydrophobic sodium alkylbenzene sulfonate is added to the ...

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Abstract

The invention discloses a high-performance primary large-particle ternary positive electrode composite material, a manufacturing method and an application thereof. The composite material comprises a ternary positive electrode material with a primary particle size of 5-8 microns, a sulfur coating layer and a composite modified layer, wherein the sulfur coating layer and the composite modified layersuccessively wrap the surface of the ternary positive electrode material from inside to outside. The composite modified layer is formed by compounding a high-molecular conductive polymer and a surfactant. The method comprises the following steps of 1) carrying out one time sintering on a ternary positive electrode material precursor matched with lithium to obtain a ternary positive electrode material in which primary particles are agglomerated into secondary particles; 2) mixing with a fluxing agent, carrying out wet ball milling to change a particle size to a nano-scale, and carrying out secondary sintering; and 3) coating sulfur and a composite modifier formed by compounding a high-molecular conductive polymer and a surfactant to obtain the ternary positive electrode composite material.The manufacturing of the primary large-particle high-nickel ternary positive electrode material with a high specific discharge capacity, high conductivity and high thermal stability can be effectively realized, a process is simple, and large-scale production is easy to realize.

Description

technical field [0001] The present invention relates to the field of new energy materials, and relates to a ternary positive electrode composite material, its preparation method and application, in particular to a high-performance primary large particle high nickel ternary positive electrode composite material, its preparation method and application. Background technique [0002] High nickel ternary cathode material (LiNi x m 1-x o 2 , 0.8≤x<1.0, M is one or more of Co, Mn and Al) has attracted much attention due to its high energy density, but it is easy to react with the electrolyte to generate a large amount of gas in the charged state, and at the same time There are certain problems in its thermal stability, safety and cycle stability under high voltage, which seriously restrict the development of high-nickel ternary LiNi. x m 1-x o 2 development of cathode materials. And the high-nickel ternary LiNi with a large grain structure x m 1-x o 2 The positive elect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525H01M4/60H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M4/38H01M4/602H01M10/0525Y02E60/10
Inventor 李旭罗亮吴小珍杨顺毅黄友元杨才德
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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