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Nanoporous structure SiO2 coated ternary positive electrode material and preparation method and application thereof

A positive electrode material, nanoporous technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of electrochemical performance attenuation, battery capacity, cycle performance attenuation, phase transition, etc., and achieve uniform particle size distribution and good cycle Effect of performance and high specific capacity

Pending Publication Date: 2022-04-12
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are still main technical problems in the existence of ternary materials: first, the phase transition of the particle surface, which is easy to cause the attenuation of battery capacity and cycle performance; Performance drop

Method used

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  • Nanoporous structure SiO2 coated ternary positive electrode material and preparation method and application thereof
  • Nanoporous structure SiO2 coated ternary positive electrode material and preparation method and application thereof
  • Nanoporous structure SiO2 coated ternary positive electrode material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A nanoporous SiO 2 The preparation method of the coated ternary cathode material comprises the following steps:

[0032] (1) Preparation of ternary cathode material matrix: the precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mixed with lithium carbonate, then sintered in air at 910°C for 10 hours, followed by crushing and classification to obtain a ternary positive electrode material matrix with a weight of 1kg; wherein the molar ratio of lithium carbonate to precursor was 1.05;

[0033] (2) Add 5.00g of tetraethyl orthosilicate to 5.59g of ethanol solution, stir evenly, then add 0.17g of dilute hydrochloric acid and 100.00g of ethanol to the mixed solution of tetraethyl orthosilicate and ethanol under stirring condition The mixture was allowed to stand for 30 minutes to obtain a silicon coating solution;

[0034] (3) Add 1 kg of the ternary positive electrode material substrate prepared in step (1) to 250.00 g of ethanol solution, stir rapidly for 10 minutes, then add it to...

Embodiment 2

[0038] A nanoporous SiO 2 The preparation method of the coated ternary cathode material comprises the following steps:

[0039] (1) Preparation of ternary cathode material matrix: the precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 Mixed with lithium carbonate, then sintered in air at 950°C for 12 hours, followed by crushing and classification to obtain a ternary positive electrode material matrix with a weight of 1kg; the molar ratio of lithium carbonate to precursor was 1.06;

[0040] (2) Add 10g of tetraethyl orthosilicate to 13.41g of ethanol solution, stir evenly, then add a mixture of 0.34g of dilute hydrochloric acid and 100.00g of ethanol to the mixed solution of tetraethyl orthosilicate and ethanol under stirring condition , standing for 30min to obtain the silicon coating solution;

[0041] (3) Add 1 kg of the ternary cathode material substrate prepared in step (1) to 333.33 g of ethanol solution, stir rapidly for 10 minutes, then add it to the silicon coating solution in...

Embodiment 3

[0045] A nanoporous SiO 2 The preparation method of the coated ternary cathode material comprises the following steps:

[0046] (1) Preparation of ternary cathode material matrix: the precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Mixed with lithium carbonate, then sintered in the air at 865°C for 10 hours, and then crushed and classified to obtain a ternary positive electrode material matrix with a weight of 1kg; wherein the molar ratio of lithium carbonate to precursor was 1.05;

[0047] (2) Add 15.00g of tetraethyl orthosilicate to 23.46g of ethanol solution, stir well, then add 0.5g of dilute hydrochloric acid and 100.00g of ethanol to the mixed solution of tetraethyl orthosilicate and ethanol under stirring condition The mixture was allowed to stand for 30 minutes to obtain a silicon coating solution;

[0048] (3) Add 1 kg of the ternary positive electrode material substrate prepared in step (1) to 500.00 g of ethanol solution, stir rapidly for 10 minutes, then add it to the ...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a nano-porous structure SiO2 coated ternary positive electrode material and a preparation method thereof.According to the method, the ternary positive electrode material is synthesized through high-temperature solid-phase sintering, and after smashing and grading, the ternary positive electrode material is coated with silica sol with ethyl alcohol as a solvent and tetraethoxysilane as a silicon source; the SiO2-coated ternary positive electrode material with the nano-porous structure is prepared through five process steps of simple high-temperature solid-phase sintering synthesis of a matrix, preparation of a silicon coating liquid, dispersion coating, hydrothermal auxiliary drying and secondary sintering, and the material has relatively high specific capacity and good cycle performance and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a nanoporous structure SiO 2 Coated ternary cathode material, its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, stable working voltage, and small self-discharge, and are considered to be one of the batteries with development potential. Cathode material is an important part of lithium-ion batteries. It is not only the bottleneck of increasing the capacity of lithium-ion batteries, but also the most important factor in determining the price of lithium-ion batteries. The search for high discharge capacity and stable cathode materials, and the production of high-quality and low-cost cathode materials have become a hot spot in the industry. The safety, energy density, output performance, cycle and cost of ternary materials are relatively balanc...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M4/525
Inventor 何健豪周宇孙杰梅京杨吉徐成何中林
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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