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Multi-element positive electrode material as well as preparation method and application thereof

A positive electrode material and multi-component technology, applied in the field of multi-component positive electrode materials and its preparation, can solve problems such as poor structural stability, serious side reactions, and inability to meet application requirements, and achieve improved stability, improved gram capacity, and improved oxygen evolution. Effect

Pending Publication Date: 2022-07-05
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the poor structural stability of oxygen-containing compound doping and / or coating positive electrode materials in the prior art and serious side reactions with the electrolyte in the high delithiation state, which cannot meet the application under high voltage conditions The problem of demand is to provide a multi-component positive electrode material and its preparation method and application. The multi-component positive electrode material has a specific structure, thereby significantly improving the structural stability of the positive electrode material, improving the oxygen evolution problem in the high delithiation state, and reducing The extent of side reactions between the positive electrode material and the electrolyte under high voltage conditions improves the electrochemical performance and safety of lithium-ion batteries

Method used

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  • Multi-element positive electrode material as well as preparation method and application thereof
  • Multi-element positive electrode material as well as preparation method and application thereof
  • Multi-element positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0053] The preparation method of the above-mentioned product includes roasting and calcining process, wherein the heating process of the roasting process below 600 ° C adopts an oxygen-depleted or oxygen-free atmosphere with an oxygen content of <20vol%, and at 600 ° C and above, an oxygen content of ≥ 20vol% is used. Air and / or oxygen atmosphere.

[0054] A second aspect of the present invention provides a method for preparing a multi-element positive electrode material, characterized in that the method comprises the following steps:

[0055] (1) Prepare mixed salt solution with nickel salt, cobalt salt and manganese salt according to the molar ratio of n(Ni):n(Co):n(Mn)=x:y:(1-x-y-a-b); Mixing agent, dispersing agent and optionally first additive, respectively formulated as precipitant solution, complexing agent solution, dispersing agent solution and optionally first additive mixture;

[0056] (2) the mixed salt solution, the precipitant solution, the complexing agent solu...

Embodiment 1

[0206] S1, prepare 2mol / L nickel cobalt manganese sulfate mixed solution (molar ratio Ni:Co:Mn=50:19:28.6), 2.5mol / L NaOH solution, 3mol / L ammonia water, 20g / L PEG1000 dispersion Aqueous solution, 1mol / L Al 2 (SO 4 ) 3 solution, the above-mentioned several solutions are passed into the reactor in a co-current manner, wherein Al 2 (SO 4 ) 3 The feeding amount was [n(Ni)+n(Co)+n(Mn)]:n(Al)=0.976:0.003, the reaction temperature was kept at 60°C, and the reaction pH was 12.0. After the reaction was completed, it was aged for 6 hours, then filtered, washed, dried at 110°C, sieved, and then heat-treated at 500°C for 8 hours in an air atmosphere to obtain a multi-element cathode material precursor.

[0207] S2, the multi-component cathode material precursor, lithium carbonate, yttrium diboride (YB 2 ), according to the ratio of [n(Ni)+n(Co)+n(Mn)]:n(Li):n(Y)=0.976:1.05:0.002, fully mixed in a high mixer, at a temperature of 1000℃ Roasting for 12h, in which, the heating process...

Embodiment 2

[0212] S1, prepare 1.5mol / L nickel cobalt manganese sulfate mixed solution (molar ratio Ni:Co:Mn=50:18:24), 3mol / L NaOH solution, 2mol / L ammonia water, 15g / L PEG1000 dispersion Aqueous solution, 0.5mol / L Al 2 (SO 4 ) 3 solution, the above-mentioned several solutions are passed into the reactor in a co-current manner, wherein Al 2 (SO 4 ) 3 The feeding amount was [n(Ni)+n(Co)+n(Mn)]:n(Al)=0.92:0.01, the reaction temperature was kept at 50°C, and the reaction pH was 11. After the reaction was completed, it was aged for 12 hours, then filtered, washed, dried at 110 °C, sieved, and then heat-treated at 400 °C for 10 hours in an air atmosphere to obtain a multi-component cathode material precursor.

[0213] S2, the multi-component cathode material precursor, lithium carbonate, yttrium diboride (YB 2 ), according to the ratio of [n(Ni)+n(Co)+n(Mn)]:n(Li):n(Y)=0.92:1.20:0.01, fully mixed in a high-mixer at a temperature of 900℃ Roasting for 18h, in which, the heating process o...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a multi-element positive electrode material as well as a preparation method and application thereof. The ratio I (006) / I (012) of the peak intensity I (006) of the crystal face (006) to the peak intensity I (012) of the crystal face (012) obtained by XRD (X-Ray Diffraction) of the multi-element positive electrode material is greater than or equal to 0.8; and the ratio A (006) / A (012) of the peak area A (006) of the crystal face (006) obtained by XRD to the peak area A (012) of the crystal face (012) of the multi-element positive electrode material is greater than or equal to 0.5. The multi-element positive electrode material has a specific structure, so that the structural stability of the positive electrode material is remarkably improved, the problem of oxygen evolution in a high lithium removal state is solved, the degree of side reaction between the positive electrode material and an electrolyte under a high voltage condition is reduced, and the electrochemical performance and the safety of a lithium ion battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a multi-element positive electrode material and a preparation method and application thereof. Background technique [0002] Due to the continuous improvement of the energy density and cycle life requirements of lithium-ion batteries in the power market in recent years, and the key role of cathode materials on the energy density and cycle life of lithium-ion batteries, multi-component cathode materials as a research hotspot continue to attract the attention of researchers and the market. [0003] Improving the energy density of lithium-ion battery cathodes is mainly achieved by increasing the gram capacity of active materials, which can generally be achieved by increasing the charge-discharge voltage window. However, increasing the charge-discharge voltage puts forward more stringent requirements on the structural stability of the cathode material and the control of the surfac...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/36H01M10/0525C01G53/00
CPCH01M4/628H01M4/525H01M4/505H01M4/366H01M10/0525C01G53/50H01M2004/028C01P2002/72C01P2006/40C01P2004/61Y02E60/10C01P2002/74C01P2002/52C01P2004/51C01G53/006C01G53/00H01M4/62H01M2004/021
Inventor 王余岳鹏刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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