High-nickel positive electrode material with primary particles being directionally arranged, and preparation method for high-nickel positive electrode material

A positive electrode material and directional arrangement technology, applied in battery electrodes, secondary batteries, electrical components, etc., can solve the problems of poor cycle performance of secondary particles, achieve high electrolyte corrosion resistance, reduce cracking, and long cycle performance Effect

Active Publication Date: 2019-05-03
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The technical problem to be solved by the present invention is to overcome the technical defect of poor secondary particle cycle performance of commonly used high-nickel positive electrode materials at present, and provide a high-nickel positive electrode material with primary particle orientation arrangement and its preparation method

Method used

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  • High-nickel positive electrode material with primary particles being directionally arranged, and preparation method for high-nickel positive electrode material
  • High-nickel positive electrode material with primary particles being directionally arranged, and preparation method for high-nickel positive electrode material
  • High-nickel positive electrode material with primary particles being directionally arranged, and preparation method for high-nickel positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Add 1kg of the precursor Ni obtained by the co-precipitation method into the 50L reactor 0.88 Co 0.09 Mn 0.03 (OH) 2 , Add 476g lithium hydroxide monohydrate and 4.35g nano-magnesium oxide according to the molar ratio of lithiation coefficient 1:1.05, stir and mix for 20min, and wait until the materials are evenly mixed. Put it into a sagger, put in an oxygen atmosphere (oxygen concentration ≥80%), pre-sinter at 600°C, then heat up to 750°C for sintering, and cool to room temperature to obtain secondary particles in which the inner primary particles are radially oriented. Ultra-long cycle cathode material Li(Ni 0.88 Co 0.09 Mn 0.03 ) 0.99 Mg 0.01 O 2 .

Embodiment 2

[0077] Add 1kg of the precursor Ni obtained by the co-precipitation method into the 50L reactor 0.88 Co 0.09 Mn 0.03 (OH) 2 , Add 476g lithium hydroxide monohydrate and 3.76g nano diboron trioxide according to the molar ratio of lithiation coefficient 1:1.05, stir and mix for 20 minutes, and wait until the materials are evenly mixed. Put it into a sagger, put in an oxygen atmosphere (oxygen concentration ≥80%), perform pre-sintering at 600°C, then heat up to 760°C for sintering, and cool to room temperature to obtain secondary particles in which the inner primary particles are radially aligned. Ultra-long cycle cathode material Li(Ni 0.88 Co 0.09 Mn 0.03 ) 0.99 B 0.01 O 2 .

Embodiment 3

[0079] Add 1kg of the precursor Ni obtained by the co-precipitation method into the 50L reactor 0.60 Co 0.20 Mn 0.20 (OH) 2 , Add 835.28g of lithium carbonate and 15.65g of molybdenum oxide according to the molar ratio of lithiation coefficient of 1:1.04, stir and mix for 20 minutes, and wait until the materials are evenly mixed. Put it into a sagger, put in an oxygen atmosphere (oxygen concentration ≥80%), perform pre-sintering at 600°C, then heat to 800°C for sintering, and cool to room temperature to obtain secondary particles in which the inner primary particles are radially aligned. Ultra-long cycle cathode material Li(Ni 0.88 Co 0.09 Mn 0.03 ) 0.99 Mo 0.01 O 2 .

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Abstract

The preparation method comprises the following steps: (1) adding a high-nickel positive electrode material precursor, a lithium source and a dopant capable of reducing the surface energy of a crystalsurface 003 of a layered structure of the high-nickel positive electrode material into a mixing kettle, and performing stirring and uniform mixing to obtain a mixture; (2) putting the mixture obtainedat the step (1) into a muffle furnace for sintering, performing thermal insulation, cooling and screening to obtain the high-nickel positive electrode material with primary particles being directionally arranged, wherein the molecular formula of the high-nickel positive electrode material with primary particles being directionally arranged is LiNixMyO2, x is greater than or equal to 0.5 and lessthan 1, y is greater than or equal to 0 and less than 0.5, x + y is equal to 1, and M is one or more than one metal element. According to the invention, the growth orientation and shape of primary particle crystals are controlled by selecting a dopant capable of reducing the surface energy of a specific crystal face of the crystal, so that the high-nickel positive electrode material secondary particles with long circulation and high safety are obtained, wherein the primary particles in the high-nickel positive electrode material secondary particles are arranged in a radial manner and grow directionally.

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 oriented primary particles and a preparation method thereof. Background technique [0002] High nickel cathode materials for lithium batteries are widely used due to their low raw material cost and high gram specific capacity, including 3C, energy storage, power batteries and other fields. [0003] Generally, the increase of nickel content in the cathode material for lithium batteries will bring higher gram specific capacity and mass energy density. However, with the increase of nickel content, the key indicators such as cycle stability, safety, and compaction density of the cathode material will be reduced accordingly. Previous researchers focused mainly on the intrinsic properties of molecular structure, and focused on the direction and means of improving the structural stability and antioxidant capacity of crystals. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 王尊志袁徐俊佘圣贤孙伟丽尹春宇张鑫刘志远王碧军
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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