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High-nickel positive electrode material with composite coating layer and preparation method thereof

A technology for positive electrode materials and coating materials, applied in the field of high-nickel positive electrode materials and their preparation, can solve the problems of high requirements for equipment and raw materials, unfavorable large-scale production, complex coating methods, etc., and achieve high ion migration ability, Reduced storage gas production and easy processing

Pending Publication Date: 2020-03-27
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this coating method is very complicated, requires high equipment and raw materials, and is expensive, which is not conducive to large-scale industrial production.

Method used

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  • High-nickel positive electrode material with composite coating layer and preparation method thereof
  • High-nickel positive electrode material with composite coating layer and preparation method thereof
  • High-nickel positive electrode material with composite coating layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for preparing a high-nickel positive electrode material with a composite coating, comprising the steps of:

[0047] (1) According to the mass ratio, nano-alumina: high-nickel cathode material (LiNi 0.9 co 0.05 mn 0.05 o 2 )=0.05:1 Mix and ball-mill nano-alumina with 100 g of the high-nickel positive electrode material, then sinter at 650° C. for 14 hours under an oxygen atmosphere (oxygen concentration ≥ 80%), cool, crush, and pass through a 300-mesh sieve to obtain a nanomaterial package coated high-nickel cathode material;

[0048] (2) By mass ratio, lithium hydroxide: high-nickel positive electrode material=0.05: 1 that lithium hydroxide and 100g step (1) obtains are added deionized water and stirred evenly, deionized water: nanomaterial The mass ratio of the coated high-nickel cathode material is 1:1; according to the mass ratio (NH 4 ) 2 HPO 4 : Nanomaterial-coated high-nickel cathode material = 0.03: 1, slowly added (NH 4 ) 2 HPO 4 Then continue...

Embodiment 2

[0050] A method for preparing a high-nickel positive electrode material with a composite coating, comprising the steps of:

[0051] (1) According to the mass ratio, nano-alumina: high-nickel cathode material (LiNi 0.9 co 0.07 mn 0.03 o 2 )=0.03:1 Mix and ball-mill nano-alumina with 100 g of the high-nickel positive electrode material, then sinter at 650° C. for 24 h under an oxygen atmosphere (oxygen concentration ≥ 80%), cool, crush, and pass through a 300-mesh sieve to obtain a nano-material package coated high-nickel cathode material;

[0052] (2) According to the mass ratio, lithium hydroxide: high-nickel cathode material coated with nanomaterials=0.025: 1 Add lithium carbonate and 100g of the material obtained in step (1) into deionized water and stir evenly, deionized water: nanomaterials coated The mass ratio of the high-nickel cathode material covered is 2:1; according to the mass ratio KH 2 PO 4 : Nanomaterial-coated high-nickel cathode material = 0.015: 1, slow...

Embodiment 3

[0054] A method for preparing a high-nickel positive electrode material with a composite coating, comprising the steps of:

[0055] (1) According to the mass ratio, nano-indium oxide: high-nickel cathode material (LiNi 0.8 co 0.1 mn 0.1 o 2 )=0.01:1 Mix and ball-mill nano-indium oxide with 100 g of the high-nickel positive electrode material, then sinter at 600° C. for 24 hours under an oxygen atmosphere (oxygen concentration ≥ 80%), cool, crush, and pass through a 300-mesh sieve to obtain a nanomaterial package coated high-nickel cathode material;

[0056] (2) By mass ratio, lithium hydroxide: the high-nickel anode material of nanomaterial coating=0.1: 1 add lithium hydroxide and the material that 100g step (1) obtains into deionized water and stir evenly, deionized water: nanomaterial The mass ratio of the coated high-nickel cathode material is 3:1; according to the mass ratio of NaH 2 PO 4 : Nanomaterial-coated high-nickel cathode material = 0.05:1, slowly add NaH 2 ...

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Abstract

The invention discloses a high-nickel positive electrode material with a composite coating layer and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing a high-nickel positive electrode material and a nano-coating material, and carrying out high-temperature sintering, cooling, crushing and sieving in a preheated muffle furnace under an oxygen atmosphere to obtain a nano-material-coated high-nickel positive electrode material; and (2) adding the high-nickel positive electrode material coated with the nano material into deionized water dissolved with a soluble lithium compound, uniformly stirring, slowly adding soluble phosphate, uniformly stirring, carrying out vacuum filtration, drying and re-burning in a kiln, cooling, crushing and sieving to obtain the high-nickel positive electrode material with the composite coating layer. According to the high-nickel positive electrode material with a composite coating layer and the preparationmethod thereof, multi-layer uniform coating of the nano material and phosphate is realized through dry-process and wet-process coating, and the prepared positive electrode material has the advantagesof good cycle performance, good thermal stability and the like, and the preparation process is simple, and the positive electrode material can be used for industrial mass production and has a wide application prospect in lithium ion battery production.

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 composite coating layer and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and low environmental pollution. They are a new type of efficient and clean green energy. It is widely used in digital electronic products, new energy vehicles and energy storage systems. In this context, the research on lithium-ion batteries has attracted more and more attention from scholars at home and abroad. [0003] The positive electrode material is the key component of the lithium-ion battery. It participates in the electrochemical reaction of the battery as an electrode material, and also acts as a source of lithium ions during the work of the battery. An ideal posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/485B82Y30/00
CPCH01M4/628H01M4/505H01M4/525H01M4/485B82Y30/00Y02E60/10
Inventor 屈振昊袁徐俊佘圣贤梅文捷刘志远于建王尊志马娇黄连友张中光
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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