Carbon-coated high-nickel positive electrode material, preparation method and application thereof, and lithium ion battery

A positive electrode material and carbon coating technology, which is applied to carbon coated high nickel positive electrode material and its preparation method and application, in the field of lithium ion batteries, can solve the problems of limited rate performance improvement, etc., to improve rate performance and reduce surface by-products The production and preparation method of the simple effect

Pending Publication Date: 2021-12-03
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defect of limited rate performance improvement of high-nickel cathode materials in the prior art, and provide a carbon-coated high-nickel cathode material with good rate performance and good safety and its preparation method and application

Method used

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  • Carbon-coated high-nickel positive electrode material, preparation method and application thereof, and lithium ion battery
  • Carbon-coated high-nickel positive electrode material, preparation method and application thereof, and lithium ion battery
  • Carbon-coated high-nickel positive electrode material, preparation method and application thereof, and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0075] Petroleum tar residue and graphene slurry are fully dispersed in a 180r / min SGN high-speed German disperser for 40min with a mass ratio of 4:0.02 to obtain a liquid coating agent; battery-grade lithium hydroxide monohydrate (purchased from Ganfeng Lithium Industry Co., Ltd.), Ni 0.88 co 0.05 mn 0.05 al 0.03 o 2 Precursor (purchased from GEM Co., Ltd.), the above-mentioned liquid coating agent with a mass ratio of 102:100:10, was wet coated in a ZSJ-600 fusion machine, no solvent was involved in the coating process, and the wet coating The coating time is 12min, and the rotating speed is 500r / min; among them, the inner wall of the ZSJ-600 fusion machine is equipped with a paddle scraper, and the Ni 0.88 co 0.05 mn 0.05 al 0.03 o 2 The precursor and battery-grade lithium hydroxide monohydrate are mixed and coated in liquid phase, and then subjected to impregnation treatment, adsorption extrusion treatment and rounding treatment to achieve the effect of surface mic...

Embodiment 2

[0079] Embodiment 2 differs from Embodiment 1 in that: petroleum tar residue and graphene slurry are fully dispersed at a mass ratio of 4:0.01, and the others are the same as Embodiment 1. At this time, the median particle size D50 is 12.8μm, and the tap density is 2.72g / cm 3 , PH is 11.7, residual alkali content <0.5%, water content 205ppm, discharge capacity 202.5mAh / g, initial efficiency 89.0%.

Embodiment 3

[0081] The difference between embodiment 3 and embodiment 1 is that petroleum tar residue and graphene slurry are fully dispersed at a mass ratio of 4:0.1, and the others are the same as embodiment 1. At this time, the median particle size D50 is 13.0 μm, and the tap density is 2.70 g / cm 3 , pH is 11.3, residual alkali content is less than 0.5%, moisture is 230ppm, discharge capacity is 201.7mAh / g, and initial efficiency is 88.7%.

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Abstract

The invention discloses a carbon-coated high-nickel positive electrode material, a preparation method and application thereof, and a lithium ion battery. The preparation method of the carbon-coated high-nickel positive electrode material comprises the following steps: carrying out wet coating and carbonization treatment on a NiCo<c>Mn<d>Al<e>O<2> precursor, a coating agent and a lithium source, wherein the coating agent comprises petroleum tar residual oil and graphene slurry, the mass ratio of the petroleum tar residual oil to the graphene slurry is 4:(0.01-0.5), and the mass ratio of the NiCo<c>Mn<d>Al<e>O<2> precursor to the coating agent is 100:(3.5-15.0). The preparation method is simple, the preparation raw materials are easy to obtain, and the prepared carbon-coated high-nickel positive electrode material is good in safety and has good rate capability.

Description

technical field [0001] The invention relates to a carbon-coated high-nickel positive electrode material, a preparation method and application thereof, and a lithium ion battery. Background technique [0002] With the increase of Ni content, the higher the energy density of the battery, the longer the cruising range of the corresponding electric vehicle will be. The proportion of nickel used in the core power battery of new energy vehicles is gradually increasing. However, problems such as the instability of the high-nickel layered structure and the degradation of electrochemical performance hinder the large-scale application of high-nickel materials in large-scale power energy equipment. In order to realize the industrialization of high-nickel materials with excellent comprehensive performance and meet the requirements of passenger car mileage and high safety, it is urgent to strengthen the physical property matching of coating materials and research on new coating processe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B32/205B82Y40/00B82Y30/00H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCC01G53/50C01B32/205B82Y40/00B82Y30/00H01M4/505H01M4/525H01M4/485H01M4/625H01M10/0525C01P2004/80C01P2004/61C01P2006/11C01P2006/40Y02E60/10
Inventor 蒋守鑫李富营李林苗荣荣吴志红
Owner SHANGHAI SHANSHAN TECH CO LTD
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