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Quick-charge type cobalt-free high-nickel ternary concentration gradient core-shell structure lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery, concentration gradient technology, applied in the direction of battery electrodes, positive electrodes, structural parts, etc., can solve the problems of cobalt ore resource shortage, high price, hindering the application of high-nickel ternary positive electrode materials, etc., to achieve abundant reserves and low cost The effect of low cost and good high current fast charging performance

Pending Publication Date: 2022-05-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current global shortage of cobalt ore resources and high prices are one of the main reasons hindering the widespread application of high-nickel ternary cathode materials (NCM)

Method used

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  • Quick-charge type cobalt-free high-nickel ternary concentration gradient core-shell structure lithium ion battery positive electrode material and preparation method thereof
  • Quick-charge type cobalt-free high-nickel ternary concentration gradient core-shell structure lithium ion battery positive electrode material and preparation method thereof
  • Quick-charge type cobalt-free high-nickel ternary concentration gradient core-shell structure lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) The first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride are prepared. The molar ratio of nickel ion, manganese ion and tungsten ion in the first salt solution is 95:4:1. The sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the salt solution is 2.00 mol / L. The molar ratio of nickel ions, manganese ions, and tungsten ions in the second salt solution is 65:34:1, and the sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the second salt solution is 2.00 mol / L.

[0027] (2) 150L first salt solution is added to the reactor of nitrogen atmosphere at the speed of 5L / h, and sodium hydroxide solution, ammonia solution are added in reactor simultaneously to carry out co-precipitation reaction for the first time, to obtain precursor core part , the molecular formula of the core part of the precursor is [Ni 0.95 Co 0.04 W 0.01 ](OH) 2 The concentration of...

Embodiment 2

[0033] (1) The first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride are prepared. The molar ratio of nickel ion, manganese ion and tungsten ion in the first salt solution is 95:4:1. The sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the salt solution is 2.00 mol / L. The molar ratio of nickel ions, manganese ions, and tungsten ions in the second salt solution is 65:34:1, and the sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the second salt solution is 2.00 mol / L.

[0034] (2) 150L first salt solution is added to the reactor of nitrogen atmosphere at the speed of 5L / h, and sodium hydroxide solution, ammonia solution are added in reactor simultaneously to carry out co-precipitation reaction for the first time, to obtain precursor core part , the molecular formula of the core part of the precursor is [Ni 0.95 Mn 0.04 W 0.01 ](OH) 2 The concentration of...

Embodiment 3

[0040] (1) The first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride are prepared. The molar ratio of nickel ion, manganese ion and tungsten ion in the first salt solution is 95:4:1. The sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the salt solution is 2.00 mol / L. The molar ratio of nickel ions, manganese ions, and tungsten ions in the second salt solution is 65:34:1, and the sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the second salt solution is 2.00 mol / L.

[0041] (2) 150L first salt solution is added to the reactor of nitrogen atmosphere at the speed of 5L / h, and sodium hydroxide solution, ammonia solution are added in reactor simultaneously to carry out co-precipitation reaction for the first time, to obtain precursor core part , the molecular formula of the core part of the precursor is [Ni 0.95 Mn 0.04 W 0.01 ](OH) 2 The concentration of...

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Abstract

The invention discloses a fast-charging type cobalt-free high-nickel concentration gradient core-shell structure lithium ion battery ternary positive electrode material and a preparation method thereof. The chemical formula of the positive electrode material is Li [NixMn1-x-yWy] O2 (at) mLi2ZrO3, x and y are mole numbers, x is larger than or equal to 0.8 and smaller than 1, y is larger than 0 and smaller than or equal to 0.05, m is mass fraction, and m is larger than 0 and smaller than or equal to 3000 ppm. The preparation method comprises the following steps: adding a first salt solution containing nickel, manganese and tungsten, a sodium hydroxide solution and an ammonia water solution into a reaction kettle according to a certain stoichiometric ratio, and reacting to form a precursor inner core; adding second salt solutions containing nickel, manganese and tungsten in different stoichiometric ratios into the reaction kettle, fully reacting, and then carrying out centrifugal washing, drying and screening to remove iron, so as to obtain a spherical precursor with the chemical formula of [NixMn1-x-yWy] (OH) 2; and sufficiently mixing the precursor powder with a zirconium source and a lithium source through a high-energy mixer, and roasting to finally obtain the fast-charging cobalt-free high-nickel concentration gradient core-shell structure lithium ion battery ternary positive electrode material. The positive electrode material disclosed by the invention has a relatively good crystal structure, and a battery prepared by taking the positive electrode material as the positive electrode material has excellent electrochemical performance; the preparation method is simple, controllable and low in cost, and has commercial application value.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a fast-charging type cobalt-free high nickel concentration gradient core-shell structure lithium ion battery ternary positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the increasing share of electric vehicles in the automobile market, people have paid more and more attention to the cruising range and fast charging performance of electric vehicles. At present, the batteries used in electric vehicles are mainly lithium-ion batteries. Among the various components of lithium-ion batteries, the cathode material largely determines the overall performance of the battery. Among them, the main role of cobalt in the ternary cathode material is to improve the crystal conductivity and stabilize the layered structure of the material, so as to improve the cycle and rate performance of the material during the charge and discharge p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/44H01M2004/028C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 欧星李宵张宝明磊
Owner CENT SOUTH UNIV
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