Preparation method of carbon quantum dot modified NCM ternary positive electrode material and prepared NCM ternary positive electrode material

A technology of carbon quantum dots and positive electrode materials, applied in positive electrodes, electrical components, battery electrodes, etc., to achieve the effects of good lithium ion transport capacity, enhanced gram capacity, and enhanced electrical conductivity

Active Publication Date: 2022-01-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The patent application with publication number CN113206236A discloses a preparation method of NCM ternary cathode material with Yolk-shell structure, which uses NCM ternary material as the core of the material, mesoporous SiO 2 As the material shell supports the NCM core, but the material has a capacity retention rate of 95.2% after 50 cycles, which needs further improvement

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  • Preparation method of carbon quantum dot modified NCM ternary positive electrode material and prepared NCM ternary positive electrode material
  • Preparation method of carbon quantum dot modified NCM ternary positive electrode material and prepared NCM ternary positive electrode material
  • Preparation method of carbon quantum dot modified NCM ternary positive electrode material and prepared NCM ternary positive electrode material

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Embodiment 1

[0054] The preparation method of the NCM ternary cathode material of the Rattle-type structure modified by carbon quantum dots comprises the following steps:

[0055] Step 1. Coating the middle layer

[0056] Combining lithium hydroxide with commercial ternary precursor Ni 70 co 10 mn 20 (OH) 2 According to the ratio of lithium element to the total molar ratio of nickel, cobalt and manganese elements in the precursor of 1.08:1, the materials were weighed and mixed evenly, and the mixed materials were sintered once for 10 hours under the condition that the volume concentration of oxygen atmosphere was 50% and the temperature was 800°C. Then pulverize and sieve 200 mesh sieves to obtain primary sintered material A;

[0057] Disperse the sintered material A into absolute ethanol, add ammonia water and methyl orthosilicate after stirring, react at room temperature and pressure for 5 hours, filter, wash with alcohol, and dry in vacuum at 120°C. The obtained material is sample B...

Embodiment 2

[0065] The preparation method of the NCM ternary cathode material of the Rattle-type structure modified by carbon quantum dots comprises the following steps:

[0066] Step 1. Coating the middle layer

[0067] Combining lithium hydroxide with commercial ternary precursor Ni 70 co 10 mn 20 (OH) 2 According to the ratio of lithium element to the total molar ratio of nickel, cobalt and manganese elements in the precursor of 1.07:1, the materials were weighed and mixed evenly, and the mixed materials were sintered once for 12 hours under the condition that the volume concentration of the oxygen atmosphere was 70% and the temperature was 850°C. Then pulverize and sieve 200 mesh sieves to obtain primary sintered material A;

[0068] Disperse the sintered material A into absolute ethanol, add ammonia water and tetraethyl orthosilicate after stirring, react at room temperature and pressure for 5 hours, filter, wash with alcohol, and dry in vacuum at 120°C. The obtained material is ...

Embodiment 3

[0076] The preparation method of the NCM ternary cathode material of the Rattle-type structure modified by carbon quantum dots comprises the following steps:

[0077] Step 1. Coating the middle layer

[0078] Combining lithium hydroxide with commercial ternary precursor Ni 70 co 10 mn 20 (OH) 2 According to the ratio of lithium element to the total molar ratio of nickel, cobalt and manganese elements in the precursor of 1.06:1, the materials were weighed and mixed evenly, and the mixed materials were sintered once for 10 hours under the condition that the volume concentration of the oxygen atmosphere was 90% and the temperature was 800°C. Then pulverize and sieve 200 mesh sieves to obtain primary sintered material A;

[0079] Disperse the sintered material A into absolute ethanol, add ammonia water and tetraethyl orthosilicate after stirring, react at room temperature and pressure for 5 hours, filter, wash with alcohol, and dry in vacuum at 120°C. The obtained material is ...

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Abstract

The invention discloses a preparation method of a carbon quantum dot modified NCM ternary positive electrode material, and relates to the technical field of ternary positive electrode materials, and the preparation method comprises the following steps: (1) coating an intermediate layer; (2) coating TiO2 doped with carbon quantum dots; (3) carrying out alkaline etching. The invention has the beneficial effects that the NCM is used as an inner core of the material, the TiO2 is used as a shell of the material, a cavity structure is formed in the middle, and the TiO2 is doped into the carbon quantum dots while protecting and supporting the inner core of the NCM, so that the conductivity of the material is enhanced. Therefore, the stability and the rate capability of the material are improved in two aspects.

Description

technical field [0001] The invention relates to the technical field of ternary positive electrode materials, in particular to a preparation method of NCM ternary positive electrode materials modified by carbon quantum dots and the prepared NCM ternary positive electrode materials. Background technique [0002] Lithium-ion secondary batteries have the advantages of high capacity, no pollution, no memory effect, small self-discharge and good cycle performance, and are excellent secondary battery energy storage devices. Lithium-ion batteries have a huge advantage in the portable electronic equipment industry, and have good development prospects in the fields of power batteries and large-scale energy storage in the future. Lithium-ion battery cathode material is a key factor restricting the capacity and life of lithium-ion batteries. [0003] Based on ternary transition metal oxides (LiNi x mn y co z o 2 / NCM) cathode material has been regarded as the most promising lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/505H01M4/52H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/505H01M4/502H01M4/523H01M4/525H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 王庆莉严雪枫朱文婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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