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 battery electrodes, positive electrodes, secondary batteries, etc., can solve the shortage of cobalt ore resources, hinder the wide application of high-nickel cathode materials, and high cost of raw materials. Increased cycle stability and low cost effects

Pending Publication Date: 2022-01-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently a shortage of cobalt ore resources in the global resource range, and the storage capacity is only 6.875 million tons. The high cost of raw materials is one of the main reasons hindering the widespread application of high-nickel cathode materials

Method used

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

[0025] (1) Prepare the first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride, the molar ratio of nickel ion, manganese ion and tungsten ion in the first salt solution is 95:4.5:0.5, the first The sum of the concentrations of nickel ions, manganese ions and tungsten ions in the salt solution is 2.00mol / L. The molar ratio of nickel ions, manganese ions, and tungsten ions in the second salt solution is 65:34.5:0.5, and the sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the second salt solution is 2.00 mol / L.

[0026] (2) Add 150L of the first salt solution at a rate of 5L / h to the reactor in a nitrogen atmosphere, and at the same time add sodium hydroxide solution and ammonia solution to the reactor for the first co-precipitation reaction to obtain the core part of the precursor , the molecular formula of the core part of the precursor is [Ni 0.95 mn 0.045 W 0.005 ](OH) 2 The concent...

Embodiment 2

[0032] (1) Prepare the first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride. The molar ratio of nickel ions, manganese ions, and tungsten ions 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 2.00mol / 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.

[0033] (2) Add 150L of the first salt solution at a rate of 5L / h to the reactor in a nitrogen atmosphere, and at the same time add sodium hydroxide solution and ammonia solution to the reactor for the first co-precipitation reaction to obtain the core part of the precursor , 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 sodium...

Embodiment 3

[0039] (1) Prepare the first salt solution and the second salt solution containing nickel sulfate, manganese sulfate and tungsten chloride. The molar ratio of nickel ions, manganese ions, and tungsten ions in the first salt solution is 95:3:2. The sum of the concentrations of nickel ions, manganese ions and tungsten ions in the salt solution is 2.00mol / L. The molar ratio of nickel ions, manganese ions, and tungsten ions in the second salt solution is 65:33:2, and the sum of the concentrations of nickel ions, manganese ions, and tungsten ions in the second salt solution is 2.00 mol / L.

[0040] (2) Add 150L of the first salt solution at a rate of 5L / h to the reactor in a nitrogen atmosphere, and at the same time add sodium hydroxide solution and ammonia solution to the reactor for the first co-precipitation reaction to obtain the core part of the precursor , the molecular formula of the core part of the precursor is [Ni 0.95 mn 0.03 W 0.02 ](OH) 2 The concentration of sodium...

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Abstract

The invention discloses a cobalt-free high-nickel ternary concentration gradient core-shell structure lithium ion battery positive electrode material and a preparation method thereof. The chemical formula of the positive electrode material is Li [NixMn1-x-yWy] O2, wherein x and y are mole numbers, x is larger than or equal to 0.8 and smaller than 1, and y is larger than 0 and smaller than or equal to 0.1. 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, reacting to form a precursor inner core, adding a second salt solution containing nickel, manganese and tungsten in different proportions into the reaction kettle, fully reacting, carrying out centrifugal washing, drying, screening to remove iron, mixing with lithium hydroxide, and roasting to obtain the lithium ion battery positive electrode material with the ternary concentration gradient core-shell structure. The concentration gradient positive electrode material disclosed by the invention has a relatively good crystal structure and relatively high tap density, and a battery prepared by taking the concentration gradient positive electrode material as the positive electrode material has excellent electrochemical performance; and the preparation method is simple, controllable, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a cobalt-free high-nickel ternary concentration gradient core-shell structure lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] NCM ternary cathode material has the advantages of high capacity, long life, low cost, and abundant raw material sources. It is widely used in the field of small lithium-ion batteries and power batteries. It is a very promising cathode material for lithium-ion batteries. 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. Therefore, the role of cobalt in the high-nickel cathode material is very important. However, there is currently a shortage of cobalt ore resources in the global resource range, and the storage capacity is only 6.875...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M10/0525C01G53/50H01M2004/028H01M2004/021C01P2004/61C01P2002/72C01P2004/03C01P2006/40C01P2006/12C01P2006/11C01P2006/82Y02E60/10
Inventor 欧星李宵申继学张宝明磊
Owner CENT SOUTH UNIV
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