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Preparation method of cobalt-free positive electrode material

A positive electrode material and system technology, applied in the field of preparation of cobalt-free positive electrode materials, to achieve the effects of excellent phase change reversibility and structural stability, ease of dissolution, and large discharge specific capacity

Inactive Publication Date: 2020-12-25
陕西红马科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of cobalt faces a series of challenges

Method used

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  • Preparation method of cobalt-free positive electrode material
  • Preparation method of cobalt-free positive electrode material
  • Preparation method of cobalt-free positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention provides a method for preparing a cobalt-free positive electrode material, comprising the following steps:

[0031] (1) Mix nickel sulfate and manganese sulfate salt solution according to Ni:Mn stoichiometric ratio 0.75:0.25, then add nano-alumina according to Al:Ni stoichiometric ratio 0.005:1, ultrasonic; in nitrogen atmosphere, mix the above solution into the reaction kettle, and then add a mixed alkali solution of NaOH and ammonia water to adjust the pH to 11.3, and the reaction temperature to 50°C. After the reaction, wash, filter, and dry.

[0032] (2) Lithium hydroxide (LiOH·H 2 O) Mix evenly with the powder obtained in step (1), calcine at a constant temperature of 910° C. for 12 hours in an oxygen atmosphere, and cool naturally to obtain a cobalt-free positive electrode material.

[0033] In conjunction with the accompanying drawings, the phase characterization and electrochemical performance of the cobalt-free positive electrode material prepare...

Embodiment 2

[0037] (1) Mix nickel nitrate and manganese nitrate salt solution by Ni:Mn stoichiometric ratio 0.60:0.40, then add nano-alumina and nano-magnesia by Al:Mg:Ni stoichiometric ratio 0.005:0.003:1, ultrasonic; In a nitrogen atmosphere, the above mixed solution was added to the reactor, and then a mixed alkali solution of KOH and ammonia was added to adjust the pH to 11.2, and the reaction temperature was 60°C. After the reaction, it was washed, filtered and dried.

[0038] (2) Lithium hydroxide (LiOH·H 2 O) Mix evenly with the powder obtained in step (1), calcinate at a constant temperature of 760° C. for 15 hours in an oxygen atmosphere, and cool naturally to obtain a cobalt-free positive electrode material.

[0039] The discharge specific capacity of the cobalt-free cathode material prepared in Example 2 is 183.5mAh / g, and the capacity retention rate remains at 92.33% after 100 cycles.

Embodiment 3

[0041] (1) Mix nickel chloride and manganese chloride salt solution by Ni:Mn stoichiometric ratio 0.70:0.30, then add nano-tungsten oxide by W:Ni stoichiometric ratio 0.008:1, ultrasonic; in nitrogen atmosphere, put The above-mentioned ion mixture is added to the reaction kettle, and then a mixed alkali solution of KOH and ammonia water is added to adjust the pH to 11.2, and the reaction temperature is 50°C. After the reaction is completed, it is washed, filtered, and dried.

[0042] (2) Lithium hydroxide (LiOH·H 2 O) Mix evenly with the powder obtained in step (1), calcinate at a constant temperature of 840° C. for 12 hours in an oxygen atmosphere, and cool naturally to obtain a cobalt-free positive electrode material.

[0043] The discharge specific capacity of the cobalt-free cathode material prepared in Example 3 is 194.3mAh / g, and the capacity retention rate remains at 94.28% after 100 cycles.

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Abstract

The invention discloses a preparation method of a cobalt-free positive electrode material, which comprises the following steps of: (1) preparing of a cobalt-free positive electrode material precursor:(1a) mixing a nickel salt solution and a manganese salt solution, adding a nano additive, and carrying out ultrasonic treatment; (1b) in a nitrogen atmosphere, adding the mixed solution into a reaction kettle, then adding a mixed alkali solution of strong alkali and ammonia water, adjusting the pH value to 9-12 and the reaction temperature to 40-60 DEG C, and washing, filtering and drying after the reaction is finished; and (2) high-temperature sintering: uniformly mixing lithium hydroxide with the powder obtained in the step (1b), calcining at a constant temperature of 700-1000 DEG C for 5-20 hours, and naturally cooling to obtain the cobalt-free positive electrode material. The method can be used for preparing a series of cobalt-free substitutes of NMC and NCA cathode materials, is simple in process, uniform in particle distribution, large in specific discharge capacity and good in cycle performance, realizes cobalt removal of the cathode materials, and reduces the cost.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and more specifically relates to a preparation method of a cobalt-free positive electrode material. Background technique [0002] Since the development of lithium-ion batteries, cobalt has played a crucial role in battery cathode chemistry—LiCoO 2 (LCO), LiNi 1-x-y mn x co y o 2 (NMC), LiNi 1-x-y co x al y o 2 (NCA) has been widely used in high-energy Li-ion batteries. Today, LiNi is the main cathode material for passenger electric vehicles (EV) 0.6 mn 0.2 co 0.2 o 2 (NMC-622) Contains ≥200 grams of Co per kWh. However, the use of cobalt faces its own set of challenges. First of all, Co is scarce and is only found in a few places on the earth. If the current positive electrode formula remains unchanged and the production of electric vehicles is only expected to increase by at least ten times, the demand for Co may be in short supply in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 李文娟田新勇方胜庭张泽鹏刘振陈森高彦宾
Owner 陕西红马科技有限公司
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