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Doped lithium ion battery high-voltage NCA positive electrode material and preparation method thereof

A technology of lithium ion battery and cathode material, applied in the field of doped lithium ion battery high-voltage NCA cathode material and its preparation, can solve the problem of uneven particle size distribution of products, difficult to control stoichiometric ratio, poor electrochemical cycle performance, etc. problems, to achieve the effect of improving oxygen utilization, reducing cation mixing, and perfect layered structure

Inactive Publication Date: 2020-02-14
SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to: lithium nickelate (LiNiO 2 ) shortcoming of poor electrochemical cycle performance, a doped lithium-ion battery high-voltage NCA positive electrode material and a preparation method thereof are provided, and the lithium-ion battery high-voltage NCA positive electrode material prepared by the present invention has very high discharge specific capacity and excellent It has stable cycle performance, and can be used safely and long-term under high voltage, and can meet the needs of high-rate charge and discharge. Disadvantages such as poor chemical properties, the prepared product has high purity, high crystal quality, high particle density and uniform distribution, excellent electrochemical performance and low manufacturing cost

Method used

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  • Doped lithium ion battery high-voltage NCA positive electrode material and preparation method thereof
  • Doped lithium ion battery high-voltage NCA positive electrode material and preparation method thereof
  • Doped lithium ion battery high-voltage NCA positive electrode material and preparation method thereof

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Embodiment 1

[0046] A doped lithium-ion battery high-voltage NCA positive electrode material provided by a preferred embodiment of the present invention, its preparation method includes the following steps: dissolving 0.85 mol of nickel sulfate and 0.025 mol of aluminum nitrate in 500 mL of deionized water, making it completely Dissolve to obtain solution A; dissolve 0.10mol of cobalt sulfate and 0.025mol of aluminum nitrate in 250mL of deionized water to completely dissolve to obtain solution B; dissolve 2.0mol of NaOH in 500mL of fresh deionized water to completely dissolve to obtain solution C; Dissolve 150ml of concentrated ammonia water in 150mL of fresh deionized water to completely dissolve it to obtain solution D;

[0047] Add solutions A, B, C, and D at a certain speed and flow them in parallel at a stirring speed of 600rpm with N 2Co-precipitate in the protected reactor, control the flow rate of the solution so that the four solutions are added at the same time and the temperatur...

Embodiment 2

[0052] A doped lithium-ion battery high-voltage NCA positive electrode material provided by a preferred embodiment of the present invention, its preparation method includes the following steps: dissolving 0.85 mol of nickel sulfate and 0.025 mol of aluminum nitrate in 500 mL of deionized water, making it completely Dissolve to obtain solution A; dissolve 0.10mol of cobalt sulfate and 0.025mol of aluminum nitrate in 250mL of deionized water to completely dissolve to obtain solution B; dissolve 2.0mol of NaOH in 500mL of fresh deionized water to completely dissolve to obtain solution C; Dissolve 150ml of concentrated ammonia water in 150mL of fresh deionized water to completely dissolve it to obtain solution D;

[0053] Add solutions A, B, C, and D at a certain speed and flow them in parallel at a stirring speed of 600rpm with N 2 Co-precipitate in the protected reactor, control the flow rate of the solution so that the four solutions are added at the same time and the temperatu...

experiment example

[0070] To the present invention prepares lithium ion battery cathode material Li[Ni 0.85 co 0.10 Al 0.05 ] 0.9995 [Y(PO 3 ) 3 ] 0.0005 o 2 X-ray diffraction experiments and scanning electron microscope observations, such as figure 1 , figure 2 shown.

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Abstract

The invention discloses a doped lithium ion battery high-voltage NCA positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping trivalent element aluminum and divalent element cobalt to replace element nickel in a positive electrode material to obtain an NCA precursor,adding a dopant M into the precursor, and sintering in a high-pressure oxygen atmosphere to obtain the lithium ion battery positive electrode material. The positive electrode material disclosed by theinvention has very high specific discharge capacity and excellent cycle stability, can meet the high-rate charge and discharge requirements, and can be safely cycled for a long time under high voltage; the positive electrode material is prepared by combining four solution parallel-flow coprecipitation with a high-pressure solid-phase synthesis method, and the prepared product is high in purity, high in crystallization quality, high in product particle density, uniform in distribution, excellent in electrochemical performance and low in manufacturing cost, is an ideal positive electrode material with high energy density and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a doped lithium-ion battery high-voltage NCA cathode material and a preparation method thereof. Background technique [0002] With the deteriorating global environment and the depletion of fossil energy resources, the research and development of energy conservation and emission reduction and green energy is imminent. Both at home and abroad attach great importance to the development and application of new energy and renewable clean energy. Lithium-ion battery is one of the new green and environment-friendly energy sources with good prospects. Because of its high energy density, fast charging, small self-discharge, long-term storage, excellent cycle performance, no memory effect, wide operating temperature, and light weight, lithium-ion batteries have been widely used in various portable electronic devices. , and is gradually becoming an ideal power source for electric vehicl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/525H01M4/58H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2006/40H01M4/485H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 刘兴泉刘一町罗欢何泽珍
Owner SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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