Preparation method for carbon nano-tube composite nickel-cobalt-magnesium-titanium four-component positive electrode material

A carbon nanotube composite, cathode material technology, applied in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of inconspicuous discharge platform, high irreversible capacity, voltage hysteresis, etc. Discharge current density, excellent physics, small effect of de-embedding depth

Active Publication Date: 2016-10-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And carbon nanotubes also have some disadvantages, such as: high irreversible capacity, voltage hysteresis and discharge platform are not obvious, etc.

Method used

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  • Preparation method for carbon nano-tube composite nickel-cobalt-magnesium-titanium four-component positive electrode material
  • Preparation method for carbon nano-tube composite nickel-cobalt-magnesium-titanium four-component positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of nickel-cobalt-magnesium-titanium quaternary cathode materials by chemical co-precipitation method

[0023] First calculate and weigh nickel sulfate, cobalt sulfate, magnesium sulfate and titanyl sulfate according to the transition metal ratio of each component of the predetermined product, and then add the above materials into deionized water to prepare a solution with a mixed concentration of nickel, cobalt, magnesium and titanium of 0.5 mol / L a, prepare sodium tartrate as a 0.05mol / L solution b, and prepare sodium carbonate as a 1mol / L solution c; control the reaction temperature of the system at about 40°C, add solution a, solution b and solution c to the reactor, The stirring speed was controlled to 800 rpm, the pH of the solution was adjusted to 7.5, and the reaction time was 3 h. After the reaction, the precipitate was filtered, washed, and dried at a drying temperature of 100° C. for 24 hours to obtain a dry spherical carbonate precursor. Then...

Embodiment 2

[0029] (1) Preparation of nickel-cobalt-magnesium-titanium quaternary cathode materials by chemical co-precipitation method

[0030] First calculate and weigh nickel sulfate, cobalt sulfate, magnesium sulfate and titanyl sulfate according to the transition metal ratio of each component of the predetermined product, and then add the above materials into deionized water to prepare a solution with a mixed concentration of nickel, cobalt, magnesium and titanium of 0.1mol / L a. Sodium tartrate is prepared as a 0.01mol / L solution b, and sodium carbonate is prepared as a 0.5mol / L solution c; the reaction temperature of the system is controlled at about 40°C, and solution a, solution b and solution c are added to the reactor , the stirring speed was controlled to 600 rpm, the pH of the solution was adjusted to 7, and the reaction time was 2h. After the reaction, the precipitate was filtered, washed, and dried at a drying temperature of 100° C. for 24 hours to obtain a dry spherical car...

Embodiment 3

[0036] (1) Preparation of nickel-cobalt-magnesium-titanium quaternary cathode materials by chemical co-precipitation method

[0037] First, calculate and weigh nickel sulfate, cobalt sulfate, magnesium sulfate and titanyl sulfate according to the transition metal ratio of each component of the predetermined product, and then add the above materials into deionized water to prepare a solution with a mixed concentration of nickel, cobalt, magnesium and titanium of 1mol / L a , prepare sodium tartrate as solution b of 0.1mol / L, and sodium carbonate as solution c of 1.5mol / L; control the reaction temperature of the system at about 40°C, add solution a, solution b and solution c to the reactor, The stirring speed was controlled to 800 rpm, the pH of the solution was adjusted to 8, and the reaction time was 5 h. After the reaction, the precipitate was filtered, washed, and dried at a temperature of 100° C. for 24 hours to obtain a dry spherical carbonate precursor. Then the spherical ...

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Abstract

The invention discloses a preparation method of a carbon nano-tube composite nickel-cobalt-magnesium-titanium four-component positive electrode material, belonging to the field of lithium-ion batteries. The preparation method comprising the following steps: preparing a nickel-cobalt-magnesium-titanium four-component positive electrode material with a molecular formula of Li(Ni<x>Co<y>Mg<z>Ti<z>)O<2> by using a chemical co-precipitation method, wherein x+y+2z = 1, 0.7 <= x <1, 0.05 <= y <= 0.1, and 0.05 <= z <= 0.1; subjecting a selected metal catalyst and the nickel-cobalt-magnesium-titanium four-component positive electrode material in a certain ratio to ball milling so as to obtain a mixture A; and placing the mixture A into a quartz tube, introducing a gaseous carbon source, allowing reaction temperature to rise so as to realize a catalytic pyrolysis reaction of the gaseous carbon source with the mixture A and carrying out cooling to room temperature so as to obtain the perfectly-coated carbon nano-tube composite nickel-cobalt-magnesium-titanium four-component positive electrode material. According to the invention, the perfectly-coated composite positive electrode material can be obtained by selecting proper process and technological parameters, so the charge-discharge capacity and charge-discharge current density of conventional lithium-ion batteries can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery cathode material, in particular to a preparation method of a carbon nanotube composite nickel-cobalt-magnesium-titanium quaternary cathode material. Background technique [0002] Compared with other traditional nickel-cadmium batteries, nickel-metal hydride batteries and lead-acid batteries, lithium-ion batteries have the following advantages: high specific energy, high power density, long cycle life, and no pollution to the environment. Rechargeable batteries are the main candidates. However, due to the low specific capacity of the positive electrode material and the additional burden of the irreversible capacity loss of the negative electrode, improving the energy density and safety of the positive electrode material has always been the key to the research of lithium-ion batteries. Layered nickel-cobalt-magnesium-titanium quaternary materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/62H01M10/05
CPCH01M4/366H01M4/485H01M4/505H01M4/625H01M10/05Y02E60/10
Inventor 荆孟娜张传明厉运杰杨思文
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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