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High-nickel ternary lithium-ion positive electrode material and preparation method thereof

A cathode material and lithium-ion technology, applied in the field of high-nickel ternary lithium-ion cathode materials and their preparation, can solve the problems of poor high-rate performance and poor cycle stability, and achieve excellent electrochemical performance, improved capacity, and cycle performance and the effect of rate performance optimization

Inactive Publication Date: 2018-11-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is exactly to provide a kind of high-nickel ternary lithium ion anode material and preparation method thereof in order to solve the above problems, mainly used to solve the problem of LiNi prepared by the prior art 0.8 co 0.1 mn 0.1 o 2 Problems such as poor cycle stability and poor high-magnification performance

Method used

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  • High-nickel ternary lithium-ion positive electrode material and preparation method thereof
  • High-nickel ternary lithium-ion positive electrode material and preparation method thereof
  • High-nickel ternary lithium-ion positive electrode material and preparation method thereof

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Embodiment 1

[0035] A pure-phase lithium-ion battery ternary cathode material whose chemical formula is LiNi 0.8 co 0.1 mn 0.1 o 2 , the specific steps of the preparation process are as follows:

[0036] 1) Precursor (chemical formula Ni 0.8 co 0.1 mn 0.1 CO 3 )A step of:

[0037] Weigh 2.32914g nickel acetate tetrahydrate, 0.29142g cobalt acetate tetrahydrate, 0.28676g manganese acetate tetrahydrate and 2.45946g urea and mix them in a beaker, add 40ml deionized water and stir until completely dissolved, then transfer to a 100ml polytetrafluoroethylene reactor place in a blast drying oven at 200°C for 10 hours, after the heat preservation is over, let it cool down to room temperature naturally, filter and wash the solution and precipitate in the reaction kettle until the pH of the filtrate is less than 7.5, and the color of the filtrate changes from blue to no color, a light green precipitate was obtained.

[0038] 2) Preparation of LiNi by high temperature solid phase method 0.8...

Embodiment 2

[0041] A kind of lithium ion battery ternary cathode material, its chemical formula is Li(Ni 0.8 co 0.1 mn 0.1 ) 0.99 Nb 0.01 o 2 , the specific steps of its preparation process are as follows:

[0042] 1) Precursor prepared by hydrothermal method (chemical formula (Ni 0.8 co 0.1 mn 0.1 ) 0.99 Nb 0.01 CO 3 )A step of:

[0043] Weigh 2.30585g nickel acetate tetrahydrate, 0.28851g cobalt acetate tetrahydrate, 0.2839g manganese acetate tetrahydrate, 0.06295g niobium oxalate hydrate and 2.45946g urea in a beaker, add 40ml deionized water and stir until completely dissolved, transfer to 100ml Put it in a polytetrafluoroethylene reaction kettle, and place it in a blast drying oven at 200°C for 10 hours. After the heat preservation is over, let it cool down to room temperature naturally. Filter and wash the solution and precipitate in the reaction kettle until the pH of the filtrate is less than 7.5, and the color of the filtrate is From blue to colorless, a light green p...

Embodiment 3

[0047] A kind of lithium ion battery ternary cathode material, its chemical formula is Li(Ni 0.8 co 0.1 mn 0.1 ) 0.995 Nb 0.005 o 2 , the specific steps of its preparation process are as follows:

[0048] 1) Precursor prepared by hydrothermal method (chemical formula (Ni 0.8 co 0.1 mn 0.1 ) 0.995 Nb 0.005 CO 3 )A step of:

[0049] Weigh 2.31749g nickel acetate tetrahydrate, 0.28996g cobalt acetate tetrahydrate, 0.28533g manganese acetate tetrahydrate, 0.03148g niobium oxalate hydrate and 2.45946g urea in a beaker, add 40ml deionized water and stir until completely dissolved, transfer to 100ml Put it in a polytetrafluoroethylene reaction kettle, and place it in a blast drying oven at 200°C for 10 hours. After the heat preservation is over, let it cool down to room temperature naturally. Filter and wash the solution and precipitate in the reaction kettle until the pH of the filtrate is less than 7.5, and the color of the filtrate is From blue to colorless, a light gr...

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Abstract

The invention relates to a high-nickel ternary lithium-ion positive electrode material and a preparation method thereof. The high-nickel ternary lithium-ion positive electrode material is niobium-doped LiNi0.8Co0.1Mn0.1O2, the chemical formula of the high-nickel ternary lithium-ion positive electrode material is Li(Ni0.8Co0.1Mn0.1)1-xNbxO2, wherein x is more than 0 and less than or equal to 2%. The preparation method comprises the following steps: mixing a nickel source, a cobalt source, a manganese source and a niobium source with urea, adding water and stirring till being dissolved for hydrothermal reaction; after reaction is ended, filtering and washing solution and precipitants in a reaction kettle, drying to obtain precursor, grinding the precursor into powder, mixing with an equimolar lithium source, mixing and grinding uniformly, carrying out high-temperature sintering on the mixed powder in an oxygen atmosphere, cooling to room temperature, and after grinding the powder, obtaining the high-nickel ternary lithium-ion positive electrode material. Compared with undoped materials, the high-nickel ternary lithium-ion positive electrode material shows better multiplying power andcycling performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-nickel ternary lithium ion positive electrode material and a preparation method thereof. Background technique [0002] With the reduction of fossil energy such as coal and petroleum, energy problems have become increasingly prominent, and finding new energy storage materials has become one of the current scientific research hotspots. Lithium-ion batteries are by far the most common energy conversion and storage devices on the market. Due to their high energy density, high voltage, and long life, they are widely used in mobile phones, computers, electric vehicles, and various digital products. An essential part of life. [0003] The composition of lithium-ion batteries includes positive electrode materials, negative electrode materials, separators, electrolytes, and current collectors. Among them, the capacity of positive electrode materials is generally sm...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/626H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赖春艳雷轶轲杨帅艾进进
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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