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A modified nickel-cobalt-manganese ternary cathode material and a preparation method thereof

A cathode material, nickel-cobalt-manganese technology, which is applied in the field of modified nickel-cobalt-manganese ternary cathode material and its preparation, can solve the problem of low stability of structure and composition electrochemical performance, slow solid-phase diffusion, and difficulty in uniform mixing and other problems, to achieve the effect of low requirements for equipment and reaction conditions, excellent electrochemical performance and low production cost

Active Publication Date: 2019-01-18
ZHEJIANG WELLY ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference between the physical properties of the lithium source and the physical properties of the nickel-cobalt-manganese hydroxide, it is difficult to mix uniformly, and the solid phase diffusion rate is slow, so there are large differences in the structure and composition of the product, which leads to its electrochemical performance. low stability

Method used

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  • A modified nickel-cobalt-manganese ternary cathode material and a preparation method thereof

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Embodiment 1

[0023] A method for preparing a modified nickel-cobalt-manganese ternary positive electrode material, comprising the steps of:

[0024] 1) Add cobalt sulfate, manganese sulfate, nickel sulfate, lithium carbonate, and tetraethylamine tetrafluoroborate into citric acid to make 0.5mol L -1 Then the solution is spray-dried to finally obtain precursor particles that are uniformly mixed at the molecular level; the precursor is heated at room temperature at 4°C / min to 750°C, and then kept at this temperature for 10-15h and then naturally cooled ; to be cooled to room temperature, the product is ground, and a 200-mesh sieve is obtained to obtain modified nickel-cobalt-manganese; the cobalt sulfate, manganese sulfate, nickel sulfate, lithium carbonate, and the mol ratio of tetraethylamine tetrafluoroborate are 0.2:0.2:0.6 :1:0.02;

[0025] 2) Add 20 g of the modified nickel-cobalt-manganese prepared in step 1) into 50 g of citric acid aqueous solution with a mass fraction of 20%, and ...

Embodiment 2

[0029] A method for preparing a modified nickel-cobalt-manganese ternary positive electrode material, comprising the steps of:

[0030] 1) Add cobalt nitrate, manganese nitrate, nickel nitrate, lithium acetate, and tetraethylamine tetrafluoroborate into citric acid to make 0.55mol L -1 solution, and then the solution was spray-dried to obtain precursor particles uniformly mixed at the molecular level; the precursor was heated at room temperature at 5 °C / min to 780 °C, and then kept at this temperature for 12 hours and then naturally cooled; Cool to room temperature, grind the product, and pass through a 250-mesh sieve to obtain modified nickel-cobalt-manganese; the molar ratio of cobalt nitrate, manganese nitrate, nickel nitrate, lithium acetate, and tetraethylamine tetrafluoroborate is 0.2:0.2:0.6:1 :0.02;

[0031] 2) Add 23 g of the modified nickel-cobalt-manganese prepared in step 1) into 65 g of citric acid aqueous solution with a mass fraction of 23%, and then add 1.5 g ...

Embodiment 3

[0035] A method for preparing a modified nickel-cobalt-manganese ternary positive electrode material, comprising the steps of:

[0036] 1) Add cobalt chloride, manganese chloride, nickel chloride, lithium chloride, and tetraethylamine tetrafluoroborate to citric acid to make 0.58mol L -1 Then the solution was spray-dried to finally obtain precursor particles mixed uniformly at the molecular level; the precursor was heated at room temperature at 6 °C / min to 800 °C, and then kept at this temperature for 13 hours and then naturally cooled; Cool to room temperature, grind the product, and pass through a 300-mesh sieve to obtain modified nickel-cobalt-manganese; the molar ratio of cobalt chloride, manganese chloride, nickel chloride, lithium chloride, and tetraethylamine tetrafluoroborate is 0.2:0.2 :0.6:1:0.02;

[0037] 2) Add 27 g of the modified nickel-cobalt-manganese prepared in step 1) into 85 g of citric acid aqueous solution with a mass fraction of 26%, and then add 2 g of...

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Abstract

The invention provides a preparation method of a modified nickel-cobalt-manganese ternary cathode material, comprising the following steps: 1) preparation of the modified nickel-cobalt-manganese and 2) preparation of the niobium doped nickel-cobalt-manganese ternary cathode material. The invention also discloses a modified nickel-cobalt-manganese ternary cathode material prepared according to thepreparation method of the modified nickel-cobalt-manganese ternary cathode material and a lithium ion battery using the modified nickel-cobalt-manganese ternary cathode material as the cathode material. Compared with the traditional Ni-Co-Mn ternary cathode material in the prior art, the modified Ni-Co-Mn ternary cathode material prepared by the invention has the advantages of lower production cost, higher gram capacity, higher cycle stability and energy density, more excellent electrochemical performance, longer cycle service life, higher first charge-discharge efficiency, and safer and environmentally friendly use.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] As human beings pay more attention to energy and environmental issues, energy storage products with high energy consumption and low efficiency (such as lead-acid batteries, nickel-metal hydride batteries, etc.) will be eliminated. Lithium batteries have been widely used in mobile phones, digital cameras, computers, electric vehicles and many other fields due to their advantages such as high specific energy, small self-discharge, long cycle life, no memory effect and environmental friendliness. In the entire composition of lithium-ion batteries, the positive electrode material occupies a very important position, and its performance directly determines the performance of the final product lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘佩吴奎辰肖伶俐何小毛汪晓俊吴清国
Owner ZHEJIANG WELLY ENERGY CORP
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