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Ternary positive electrode material with high volume energy density for lithium ion battery and preparation method

A technology for lithium ion batteries and cathode materials, which is applied in the field of synthesis of high volume energy density single crystal ternary cathode materials for lithium ion batteries, can solve problems such as the influence of capacity and stability, uneven distribution of doping elements, etc. Wide range, the effect of increasing volume energy density, increasing compaction density

Active Publication Date: 2020-01-17
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these doping methods, the distribution of doping elements in the positive electrode material is often not uniform, and its capacity and stability will also be affected.

Method used

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  • Ternary positive electrode material with high volume energy density for lithium ion battery and preparation method
  • Ternary positive electrode material with high volume energy density for lithium ion battery and preparation method
  • Ternary positive electrode material with high volume energy density for lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] S1, first set Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, lithium hydroxide monohydrate, aluminum oxide, titanium oxide and boron oxide are mixed with ethanol: water as a mixed solvent of 1:3, and then fully ground with a ball mill and spray-dried to obtain a solid powder to form a uniform mixture. , The molar ratio of lithium hydroxide monohydrate, aluminum oxide, titanium oxide and boron oxide is 1:1.05:0.005:0.01:0.015;

[0044] S2, pre-sintering at 700°C for 5 hours in an atmosphere furnace with an oxygen volume fraction of 99%, and adding titanium isopropoxide as a shape modifier after cooling, wherein the molar ratio of NCM precursor to titanium isopropoxide is 1: 0.005, use a ball mill to mix evenly;

[0045] S3, sintering in an atmosphere furnace with an oxygen volume fraction of 99%, the specific sintering procedure is 5°C·min -1 The heating rate is increased to 500°C and kept for 8 hours; then at 5°C·min -1 The heating rate was raised to 650°C, and kept for 8...

Embodiment 2

[0047] Others are the same as in Example 1, the difference is that the raw material is Ni in S1 0.8 co 0.1 mn 0.1 (OH) 2 The precursor, lithium hydroxide monohydrate, aluminum hydroxide, and titanium oxide are mixed according to the molar ratio of 1:1.05:0.015:0.015, and finally a ternary lithium battery positive electrode material with a primary particle size D50 of about 8.8 μm is obtained.

Embodiment 3

[0049] Others are the same as in Example 1, the difference is that the raw material is Ni in S1 0.8 co 0.1 mn 0.1 (OH) 2 The precursor, lithium hydroxide monohydrate, alumina, and zirconium ethoxide are mixed according to the molar ratio of 1:1.05:0.01:0.02, and finally a ternary lithium battery cathode material with a primary particle size D50 of about 8.2 μm is obtained.

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Abstract

The invention provides a method for preparing a ternary positive electrode material with a high volume energy density for a lithium ion battery. The method comprises the following steps: S1, uniformlymixing a ternary positive precursor, a lithium salt and a doping oxide; S2, pre-sintering the mixture in S1 in an oxygen or air atmosphere furnace, cooling the pre-sintered mixture naturally, addinga shape modifier into the pre-sintered material, and performing uniform mixing; and S3, sintering the material obtained in S2 in an oxygen or air atmosphere, so as to obtain a monocrystalline ternarypositive electrode material with the high volume energy density. The added shape modifier in the method is capable of controlling the amount of released lithium ions, reducing expansion and contraction degrees of a crystal in the process of charge and discharge, improving the stability of circulation, increasing the sizes of crystal particles, and improving the vibratory density of the material. By adopting the method provided by the invention, the monocrystalline ternary positive electrode material with the high volume energy density can be prepared by simply adding a certain amount of a sintering aid material to the mixture of the precursor and the lithium salt and keeping the temperaturein mixed gas at a certain temperature for a period of time.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for synthesizing a high volume energy density single crystal ternary cathode material for lithium ion batteries. Background technique [0002] With the development of globalization and the continuous progress of social economy, 3C digital electronic products are an indispensable part of people's colorful life. Lithium-ion batteries are chosen as power sources by developers of 3C products because of their high energy density, long service life, and relatively high safety. The types of cathode materials for lithium batteries commercialized on a large scale today are mainly: lithium iron phosphate (LiFePO 4 ), lithium manganate (LiMn 2 o 4 ), lithium cobalt oxide (LiCoO 2 ) and nickel-based ternary materials (LiNi x co y B 1-x-y o 2 ) (1≥x≥y≥0, B is Mn or Al). However, lithium iron phosphate cathode material [0003] Because it needs to be nanometeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/505H01M4/525H01M10/0525H01M4/02
CPCC01G49/00C01P2004/03C01P2004/61C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 郭玉国石吉磊盛航张旭东殷雅侠岳风树姚钧
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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