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A kind of nano-magnesium lithium silicate coated high-nickel positive electrode material and its preparation method and application

A technology of lithium magnesium silicate and positive electrode material, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problem of not being able to fully coat, and achieve the effect of reducing the occurrence of side reactions, slowing down the denaturation speed, and improving the storage performance.

Active Publication Date: 2021-04-13
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot fully cover the surface of the material during the coating process, especially at the junction of primary particles and primary particles, which is often too concentrated, resulting in a small part of other surfaces that are not fully covered and exposed, and the material surface is exposed. The part that comes out is easy to contact with air and react to the above by-products

Method used

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  • A kind of nano-magnesium lithium silicate coated high-nickel positive electrode material and its preparation method and application
  • A kind of nano-magnesium lithium silicate coated high-nickel positive electrode material and its preparation method and application
  • A kind of nano-magnesium lithium silicate coated high-nickel positive electrode material and its preparation method and application

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Embodiment 1

[0033] This embodiment provides a nano-lithium magnesium silicate coated high-nickel positive electrode material, the preparation method of which comprises the following steps:

[0034] (1) Preparation of nano-lithium magnesium silicate

[0035] 5.00g of H 2 SiO 3 Add it to a beaker with 1L of pure water, then add 1.79g LiOH·H while stirring 2 O and 2.49g Mg(OH) 2 , continue to stir for 30 minutes after the addition is completed, and finally spray and collect nano-magnesium lithium silicate Li 2 Mg 2 (SiO 3 ) 3 ;

[0036] (2) Mixing

[0037]Combine battery-grade lithium hydroxide with high-nickel cathode material precursor Ni 0.82 co 0.12 mn 0.06 (OH) 2 Add it into a high-speed mixer at a molar ratio of 1.04:1 and mix for 25 minutes until it is evenly mixed to obtain a mixed material;

[0038] (3) Primary roasting

[0039] The mixed material obtained in step (2) is roasted in an oxygen atmosphere roller furnace at 750°C for 12 hours. After the roasting is complet...

Embodiment 2

[0043] This embodiment provides a nano-lithium magnesium silicate coated high-nickel positive electrode material. 2 Mg 2 (SiO 3 ) 3 And a roasted semi-finished product; a roasted semi-finished product and nano-lithium magnesium silicate Li 2 Mg 2 (SiO 3 ) 3 Mix evenly according to the weight ratio of 1:0.0033, then roast in an oxygen atmosphere roller furnace at 320°C for 6 hours, cool naturally to room temperature after roasting, pulverize after being released from the furnace, and pass through a 400-mesh sieve to obtain the described Nano-lithium magnesium silicate coated high-nickel cathode material.

Embodiment 3

[0045] This embodiment provides a nano-lithium magnesium silicate coated high-nickel positive electrode material. 2 Mg 2 (SiO 3 ) 3 And a roasted semi-finished product; a roasted semi-finished product and nano-lithium magnesium silicate Li 2 Mg 2 (SiO 3 ) 3 Mix evenly according to the weight ratio of 1:0.0050, then roast in an oxygen atmosphere roller furnace at 320°C for 6 hours, cool naturally to room temperature after roasting, pulverize after being released from the furnace, and pass through a 400-mesh sieve to obtain the described Nano-lithium magnesium silicate coated high-nickel cathode material.

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Abstract

The invention discloses a method for preparing a high-nickel positive electrode material coated with nano-magnesium-lithium silicate. The method is to obtain a semi-finished product by roasting a lithium compound and a high-nickel precursor, and then combine the nano-magnesium-lithium silicate through mechanical fusion. Coated on the primary fired semi-finished product and fired to obtain a nano magnesium lithium silicate coated high-nickel positive electrode material with excellent storage performance. The invention can effectively improve the stability of the surface interface of the high-nickel positive electrode material, reduce the occurrence of side reactions between the positive electrode material and the electrolyte, thereby improving the cycle electrical performance of the positive electrode material. In addition, the coating layer formed on the surface of the high-nickel positive electrode material in the present invention has a network structure, and the coating is dense and comprehensive, which can effectively block the contact between the high-nickel positive electrode material and the air, and slow down the denaturation speed of the high-nickel positive electrode material in the atmosphere .

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a nano magnesium lithium silicate coated high nickel positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries occupy a very important place in clean energy, and have developed rapidly in recent years, providing a new development path for global energy and environmental issues. Among them, the rapid development of China's new energy vehicles has brought about a strong demand for power lithium batteries. As new energy vehicles gradually penetrate into the lives of the public, people are more concerned about the battery life of new energy vehicles. As the demand for high specific energy batteries in the domestic market becomes more and more urgent, the development of a high-capacity battery cathode material has become an inevitable trend of market competition, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/525H01M10/0525
CPCH01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 吴建华苏柏涛范江陆俊杰陈伟邓慧君李邑柯赵健辉邓晓燕史镇洪万国江
Owner JIANGMEN KANHOO IND
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