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Preparation method of SiO2-coated ternary cathode material

A positive electrode material and coating technology, which is applied in the field of SiO2-coated ternary positive electrode material and its preparation, can solve the problems of low electrical performance of products, high process energy consumption, low electrical conductivity, etc., and achieve stable electrical performance and good capacity retention. The effect of high rate and simple preparation method

Active Publication Date: 2019-04-19
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although ternary cathode materials have many advantages, they also have disadvantages, such as poor cycle performance under high voltage conditions, mixed rows between metal elements, and low conductivity.
In order to improve the performance of the ternary positive electrode material, wrapping has become an effective means, such as prior art CN108134073A coating modified nickel-cobalt-manganese, nickel-cobalt-aluminum ternary positive electrode materials with metal oxides such as aluminum oxide and zinc oxide, but using dry method The preparation method of mixed coating not only has low electrical properties of the prepared product, but also high energy consumption in the process
CN104882589A uses carbon to coat nickel-cobalt-manganese ternary positive electrode material, and the prepared product has poor electrochemical performance, such as poor rate charge and discharge performance and other shortcomings

Method used

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  • Preparation method of SiO2-coated ternary cathode material
  • Preparation method of SiO2-coated ternary cathode material
  • Preparation method of SiO2-coated ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A SiO 2 A method for preparing a coated ternary positive electrode material, comprising the following steps:

[0032] (1) Press Li(Ni0.5 co 0.2 mn 0.3 )O 2 : tetraethyl orthosilicate is 10g: the ratio of 0.1ml takes each component, Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Pour into a three-necked flask, then pour in water (Li(Ni 0.5 co 0.2 mn 0.3 )O 2 : the mass ratio of water is 1:5) and placed in a water bath heating box to heat and stir at a water bath temperature of 40°C to obtain Li(Ni 0.5 co 0.2 mn 0.3 )O 2 solution, then continue to heat at 40°C in a water bath, stir, and use a pipette to take tetraethyl orthosilicate and add it dropwise to Li(Ni 0.5 co 0.2 mn 0.3 )O 2 In the solution, stir for 15 minutes, after the stirring is completed, pour the solution from the three-necked flask into the beaker, let it stand still for 20 hours, and set aside;

[0033] (2) Remove the upper layer solution in the beaker in step (1), take the lower layer of suspension and ...

Embodiment 2

[0036] A SiO 2 A method for preparing a coated ternary positive electrode material, comprising the following steps:

[0037] (1) Press Li(Ni 0.5 co 0.2 mn 0.3 )O 2 : Orthosilicate is 10g: the ratio of 0.27ml takes each component, Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Pour into a three-necked flask, then pour deionized water (Li(Ni 0.5 co 0.2 mn 0.3 )O 2 : the mass ratio of deionized water is 1:8) and placed in a water bath heating box to heat and stir at a water bath temperature of 80°C to prepare Li(Ni 0.5 co 0.2 mn 0.3 )O 2 solution, then continue to heat at 80°C in a water bath, stir, and use a pipette to take tetraethyl orthosilicate and add it dropwise to Li(Ni 0.5 co 0.2 mn 0.3 )O 2 In the solution, stir for 20 minutes, after the stirring is completed, pour the solution from the three-necked flask into the beaker, let it stand still for 24 hours, and set aside;

[0038] (2) Remove the upper layer solution in the beaker in step (1), take the lower layer suspensi...

Embodiment 3

[0042] A SiO 2 A method for preparing a coated ternary positive electrode material, comprising the following steps:

[0043] (1) Press Li(Ni 0.5 co 0.2 mn 0.3 )O 2 : tetraethyl orthosilicate solution is 10g: the ratio of 0.27ml takes each component, Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Pour into a three-necked flask, then pour in water (Li(Ni 0.5 co 0.2 mn 0.3 )O 2 : the mass ratio of water is 1:10) and placed in a water bath heating box to heat and stir at a water bath temperature of 60°C to obtain Li(Ni 0.5 co 0.2 mn 0.3 )O 2 solution, and then continue to heat and stir at a water bath temperature of 60°C, and use a pipette to take tetraethyl orthosilicate and add it dropwise to Li(Ni 0.5 co 0.2 mn 0.3 )O 2 In the solution, stir for 20 minutes, after the stirring is completed, pour the solution from the three-necked flask into the beaker, let it stand still for 24 hours, and set aside;

[0044] (2) Remove the upper layer of the solution in the beaker in step (1), ...

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Abstract

The invention mainly discloses a preparation method of a SiO2-coated ternary cathode material. The method comprises the following steps of: performing heating in a water bath, stirring and standing atthe temperature of 40-85 DEG C according to the proportion of the Li(Ni0.5Co0.2Mn0.3)O2:tetraethyl orthosilicate being 8-15g:0.1-1.1ml, taking a suspension for drying at the temperature of 110-130 DEG C for 1.5-2.5 hours, and performing annealing at the temperature of 700-900 DEG C for 2-3 hours to prepare a SiO2-coated ternary cathode material. The button battery made of the SiO2-coated ternarycathode material is simple in preparation method, high in battery capacity maintenance rate, good stability of the electrical performance by repeated use and good in market application value.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a SiO 2 A coated ternary positive electrode material and a preparation method thereof. Background technique [0002] With the development of human beings, the demand for oil, coal, and natural gas is increasing rapidly. Since these fuels are non-renewable resources, in order to achieve sustainable development of human beings, the development and application of new energy sources is particularly important. The wide application of solar energy, geothermal energy, wind energy, nuclear energy and other new energy sources has greatly alleviated the energy crisis and promoted the great development of society, while electric energy, as the greenest energy source, has been widely used. As an energy storage device that converts other energies into chemical energy, the battery is widely used in electronic equipment, electric vehicles and other fields due to its combination of convenie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/058
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王忆郑泽纯周勤勤
Owner WUYI UNIV