Doped high-nickel high-voltage NCM positive electrode material and preparation method thereof

A cathode material, high-voltage technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficult to control stoichiometric ratio, uneven product particle size distribution, poor electrochemical cycle performance, etc., to improve oxygen Utilization rate, reduction of cation mixing, perfect effect of layered structure

Pending Publication Date: 2020-02-14
SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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  • 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 ) the shortcoming of poor electrochemical cycle performance, a doped high-nickel high-voltage NCM positive electrode material and a preparation method thereof are provided, the lithium-ion battery positive electrode material prepared by the present invention has very high discharge specific capacity and excellent cycle stability, Moreover, it can be safely used in a long cycle at a high voltage of 4.50V, and at the same time can meet the needs of high-rate charge and discharge. Poor performance and other shortcomings, 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 high-nickel high-voltage NCM positive electrode material and preparation method thereof
  • Doped high-nickel high-voltage NCM positive electrode material and preparation method thereof
  • Doped high-nickel high-voltage NCM positive electrode material and preparation method thereof

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Embodiment 1

[0048] A doped high-nickel high-voltage NCM 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 manganese nitrate in 500 mL of deionized water to completely dissolve Obtain solution A; dissolve 0.10 mol of cobalt sulfate and 0.025 mol of manganese nitrate in 250 mL of deionized water to obtain solution B; dissolve 2.0 mol of NaOH in 500 mL of fresh deionized water to obtain solution C ; Dissolve 150ml of concentrated ammonia water in 150mL of fresh deionized water to completely dissolve it to obtain solution D;

[0049] 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 temperature in the reactor is controlled at 50-80 °C; after the ad...

Embodiment 2

[0054] A doped high-nickel high-voltage NCM 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 manganese nitrate in 500 mL of deionized water to completely dissolve Obtain solution A; dissolve 0.10 mol of cobalt sulfate and 0.025 mol of manganese nitrate in 250 mL of deionized water to obtain solution B; dissolve 2.0 mol of NaOH in 500 mL of fresh deionized water to obtain solution C ; Dissolve 150ml of concentrated ammonia water in 150mL of fresh deionized water to completely dissolve it to obtain solution D;

[0055] 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 temperature in the reactor is controlled at 50-80 °C; after the ad...

experiment example

[0072] To the present invention prepares lithium ion battery cathode material Li[Ni 0.85 co 0.10 mn 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 high-nickel high-voltage NCM 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 manganese and cobalt to obtain an NCM precursor; and adding a dopant M into the precursor, and sintering the precursor in a high-pressure oxygen atmosphere to obtain a lithium ion battery positive electrode material. The positive electrode material has very high specific discharge capacity and excellent cycling stability, can meet the high-rate charging and discharging requirement, and can achieve long-life safe cycling under high voltage. The positive electrode material is prepared by combining four-solution parallel-flow co-precipitation witha high-pressure solid-phase synthesis method, and the prepared product has the advantages of high purity, high crystallization quality, high particle density, uniform distribution of particles, excellent electrochemical performance and low 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 high-nickel high-voltage NCM positive electrode 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 veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/485H01M10/0525C01G53/006Y02E60/10
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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