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Quaternary nickel cobalt magnesium titanium cathode material of lithium ion battery, and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as low energy density and inability to achieve fast charging

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

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low energy density and inability to realize rapid charging existing in the existing lithium-ion battery positive electrode materials, the present invention provides a lithium-ion battery quaternary nickel-cobalt-magnesium-titanium positive electrode material and a preparation method thereof, thereby promoting the further development of lithium-ion batteries Promote application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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 Ni:Co:Mg:Ti=0.7:0.2:0.05:0.05, and then prepare the above materials into a concentration of 0.5mol / L solution A; prepare sodium tartrate as 0.05mol / L solution B; prepare sodium carbonate as 1mol / L solution C; control the reaction temperature of the system at about 40°C; prepare solution A, solution B and solution C was added into the reactor for co-precipitation reaction, the stirring speed was controlled at 500 rpm, the pH of the solution was adjusted to 7.5 with ammonia water, and the reaction time was 3 hours. After the reaction, the precipitate was filtered, washed, and dried at a drying temperature of 100° C. for 24 hours to obtain a dry precursor. Then the precursor and lithium carbonate are mixed according to the mass ratio of precursor: lithium carbonate = 1:0.5, and calcined in an ...

Embodiment 2

[0027] 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 Ni:Co:Mg:Ti=0.75:0.15:0.05:0.05, and then prepare the above materials into a concentration of 3.5mol / L solution A, sodium tartrate and deionized water to prepare 0.05mol / L solution B, sodium carbonate and deionized water to prepare 0.5mol / 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 for co-precipitation reaction, control the stirring speed at 500 rpm, adjust the pH of the solution with ammonia water to 7.5, and the reaction time is 3h. After the reaction, the precipitate was filtered, washed, and dried at a drying temperature of 100° C. for 24 hours to obtain a dry precursor. Then the precursor and lithium carbonate are mixed according to the mass ratio of precursor: lithium carbonate = 1:0.5, and calci...

Embodiment 3

[0029] 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 Ni:Co:Mg:Ti=0.8:0.1:0.05:0.05, and then prepare the above materials into a concentration of 1mol / L solution A, sodium pyrophosphate and deionized water are prepared into 0.1mol / L solution B, sodium hydroxide and deionized water are prepared into 1mol / L solution C; the reaction temperature of the control system is around 40°C ; Add solution A, solution B and solution C to the reactor for co-precipitation reaction, control the stirring speed at 500 rpm, adjust the pH of the solution with ammonia water to 7.5, and the reaction time is 3h. After the reaction, the precipitate was filtered, washed, and dried at a drying temperature of 100° C. for 24 hours to obtain a dry precursor. Then the precursor and lithium carbonate are mixed according to the mass ratio of precursor: lithium carbonate = 1:0...

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Abstract

This invention provides a quaternary nickel cobalt magnesium titanium cathode material of lithium ion battery, and a preparation method thereof. The chemical formula of the cathode material is Li (NixCoyMgzTiz) O2; the cathode material is formed by calcining a precursor and a lithium source; the precursor is prepared by a chemical coprecipitation reaction of soluble nickel salt, soluble cobalt salt, soluble magnesium salt and soluble titanium salt according to the following mole ratio of metal materials: Ni:Co:Mg:Ti=x:y:z; x+y+2z=1; x is not less than 0.7 and is less than 1; y is not less than 0.05 and is not greater than 0.1; and z is not less than 0.05 and is not greater than 0.1. In this invention, four metal elements are used as the cathode material; the incorporation of Co, Ti and Mg is helpful to increase and improve the capacity of the cathode material, can reduce the reaction degree of Co4+ and HF (Hydrogen Fluoride) generated by LiPF6 in the electrolyte, and can improve the fast charging and discharging capacity and the cycling performance of the quaternary nickel cobalt magnesium titanium cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery quaternary nickel-cobalt-magnesium-titanium cathode material and a preparation method thereof. Background technique [0002] Compared with other traditional rechargeable batteries, lithium-ion batteries have significant advantages such as high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate. As an important class of chemical batteries, lithium-ion batteries are widely used in mobile phones, notebook computers, digital cameras and portable small appliances, and are gradually moving towards the field of electric vehicle power. As global energy and environmental problems become more and more serious, vehicles have switched to energy storage batteries as the main power source. Lithium-ion batteries are considered to be ideal for h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/525H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 荆孟娜张传明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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