High-nickel positive electrode material with uniform coating layer and preparation method of high-nickel positive electrode material

A positive electrode material and coating layer technology, which is applied in the field of high nickel positive electrode material and its preparation, can solve the problems of high requirements on equipment and raw materials, unfavorable large-scale production, complex coating method, etc., and achieves reduction of surface pH and residual Lithium, low equipment requirements, low cost effect

Inactive Publication Date: 2019-07-02
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, the existing coating methods are very complicated, require high equipm

Method used

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  • High-nickel positive electrode material with uniform coating layer and preparation method of high-nickel positive electrode material
  • High-nickel positive electrode material with uniform coating layer and preparation method of high-nickel positive electrode material
  • High-nickel positive electrode material with uniform coating layer and preparation method of high-nickel positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] Example 1

[0054] Add 1kg of deionized water with 16g of lithium hydroxide dissolved in a 1L beaker and high nickel cathode active material LiNi 0.80 Co 0.10 Mn 0.10 O 2 1kg, stirring speed 500r / min, wait to be evenly stirred. Add slowly (NH 4 ) 2 HPO 4 The stirring speed of 3.25g remains unchanged, and it is preferable to continue stirring for 20 min. Filter the obtained mixture, filter with a vacuum water pump, rinse with 20 mL of absolute ethanol, drain, and dry in a blast oven at 150°C for 3 hours to obtain dry materials, which are placed in a sagger and placed in a preheated muffle furnace Sintering reaction at 700℃ for 10h under oxygen atmosphere (oxygen concentration ≥80%). Slowly cooling, crushing and sieving to obtain a high nickel positive electrode material active material with a uniform coating layer.

Example Embodiment

[0055] Example 2

[0056] Add 1kg of deionized water with 16g of lithium hydroxide dissolved in a 1L beaker and high nickel cathode active material LiNi 0.90 Co 0.05 Mn 0.05 O 2 1kg, stirring speed 500r / min, wait to be evenly stirred. Add Na slowly 3 PO 4 The stirring speed of 4.03g remains unchanged, and it is preferable to continue stirring for 20 minutes. Filter the obtained mixture, filter with a vacuum water pump, rinse with 20 mL of absolute ethanol, drain, and dry in a blast oven at 150°C for 3 hours to obtain dry materials, which are placed in a sagger and placed in a preheated muffle furnace Sintering reaction at 700℃ for 10h under oxygen atmosphere (oxygen concentration ≥80%). Slowly cooled, crushed and sieved to obtain a high nickel cathode material active material LiNi with a uniform coating layer 0.90 Co 0.05 Mn 0.05 O 2 .

Example Embodiment

[0057] Example 3

[0058] Add 1kg of deionized water with 16g of lithium hydroxide dissolved in a 1L beaker and high nickel cathode active material LiNi 0.80 Co 0.10 Mn 0.10 O 2 1kg, stirring speed 500r / min, wait to be evenly stirred. Slowly join K 3 PO 4 The stirring speed of 5.22g remains unchanged, and it is preferable to continue stirring for 20 minutes. Filter the obtained mixture, filter with a vacuum water pump, rinse with 20 mL of absolute ethanol, drain, and dry in a blast oven at 150°C for 3 hours to obtain dry materials, which are placed in a sagger and placed in a preheated muffle furnace Sintering reaction at 700℃ for 10h under oxygen atmosphere (oxygen concentration ≥80%). Slowly cooled, crushed and sieved to obtain a high nickel cathode material active material LiNi with a uniform coating layer 0.80 Co 0.10 Mn 0.10 O 2 .

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Abstract

The invention discloses a high-nickel positive electrode material with a uniform coating layer and a preparation method of the high-nickel positive electrode material, and the preparation method comprises the following steps: (1) adding deionized water dissolved with a soluble lithium compound and a high-nickel positive electrode material into a container, and performing uniform stirring to obtaina suspension; (2) slowly adding soluble phosphate into the suspension obtained at step (1), performing uniform stirring, carrying out vacuum filtration, performing washing with absolute ethyl alcohol, performing draining, and performing drying in a drying oven to obtain a dried material; (3) putting the dried material obtained at step (2) into a sagger, and carrying out high-temperature sintering, cooling, crushing and sieving in a preheated muffle furnace under an oxygen atmosphere to obtain the high-nickel positive electrode material with the uniform coating layer. The phosphate and the high-nickel positive electrode material are mixed with lithium ions through a liquid phase method. Coating is carried out while reaction is carried out. The operation is easy, the cost is low, and the large-scale production is easy to achieve. The high-nickel positive electrode material disclosed by the invention has the advantages of high specific capacity, long cycle, better thermal stability and better structural stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel positive electrode material with a uniform coating layer and a preparation method thereof. Background technique [0002] The development of battery technology, especially the popularization and application of lithium-ion batteries, greatly facilitates the production and life of human society. The cathode material determines most of the performance of the lithium-ion battery and is an important part of the lithium-ion battery. At present, the mainstream lithium-ion battery cathode materials on the market include lithium cobaltate, lithium manganate, ternary nickel cobalt lithium manganate, and ternary nickel cobalt lithium aluminate. These materials will inevitably attenuate to a certain extent during the charging and discharging cycle of the battery, and even generate gas, which will affect the cycle performance and safety performance. Doping and coa...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 王尊志袁徐俊佘圣贤刘志远屈振昊张中光
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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