A kind of preparation method of carbon-coated ternary positive electrode material

A positive electrode material and carbon coating technology, which is applied in the field of preparation of carbon-coated ternary positive electrode materials, can solve the problem that ternary positive electrode materials are easily reduced by carbon, etc. Effect of magnification performance

Active Publication Date: 2020-09-01
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing a carbon-coated ternary positive electrode material, so as to overcome the problem that the ternary positive electrode material is easily reduced by carbon under high temperature conditions in the existing carbon coating method

Method used

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  • A kind of preparation method of carbon-coated ternary positive electrode material
  • A kind of preparation method of carbon-coated ternary positive electrode material
  • A kind of preparation method of carbon-coated ternary positive electrode material

Examples

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Effect test

Embodiment 1

[0051] A novel carbon-coated nickel-cobalt-manganese ternary cathode material, the preparation method of which is:

[0052] Step 1, the prepared NCM622, i.e. Li(Ni 0.6 co 0.2 mn 0.2 )O 2 As the matrix material, mix the bare ternary material and ethyl orthosilicate (converted into silicon dioxide) in the ethanol phase at a mass ratio of 1:0.01, stir at 60°C for 3 hours, and slowly add a certain amount of deionized Water, react at 800r / min for 3 hours, then heat up to 100°C to send out all the solvents, scrape off the powder and sinter in air at 500°C for 5 hours, and then cool to obtain a silica-coated ternary material, denoted as SiO 2 @NCM.

[0053] Step 2, use the silica-coated ternary material in the experimental step 1, add it to 5% glucose aqueous solution, heat and stir, evaporate to dryness, and then put it into a tube furnace at 800°C for sintering in a nitrogen atmosphere for 3 hours, A double-coated ternary material of silica and carbon, denoted as C / SiO 2 @NCM. ...

Embodiment 2

[0057] A novel carbon-coated nickel-cobalt-manganese ternary cathode material, the preparation method of which is:

[0058] Step 1: Take the prepared NCM622 as the base material, mix the bare ternary material and silicon tetrachloride (converted into silicon dioxide) in the ethanol phase at a mass ratio of 1:0.005, stir at 20°C for 7 hours, and then mix it according to the chemical Add a certain amount of deionized water dropwise at a metering ratio, react at 800r / min for 3 hours, then heat up to 100°C to emit all the solvent, scrape off the powder and sinter in air at 200°C for 8 hours, and then cool to obtain a silica coating Covered ternary material, denoted as SiO 2 @NCM.

[0059] Step 2: Use the silicon oxide-coated ternary material in the experimental step 1, add it to 1% glucose aqueous solution, heat and stir, evaporate to dryness, and then put it into a tube furnace at 100°C for sintering in a nitrogen atmosphere for 20 hours. A double-coated ternary material of sil...

Embodiment 3

[0063] A novel carbon-coated nickel-cobalt-manganese ternary cathode material, the preparation method of which is:

[0064] Step 1. Using the prepared NCM622 as the base material, mix the bare ternary material and silica particles in the methanol phase at a mass ratio of 1:0.02, stir at 80°C for 2 hours, and then add a certain amount of Ionized water, react at 800r / min for 3 hours, then heat up to 100°C to send out all the solvent, scrape off the powder and sinter in air at 700°C for 2h, and then cool to obtain a silica-coated ternary material, which is denoted as SiO 2 @NCM.

[0065] Step 2. Use the silicon oxide-coated ternary material in the experimental step 1, add it to 10% glucose aqueous solution, heat and stir, evaporate to dryness, and then put it into a tube furnace at 1000°C for sintering under a nitrogen atmosphere for 1 hour. A double-coated ternary material of silicon oxide and carbon, denoted as C / SiO 2 @NCM.

[0066] Step 3. Put the material in the experime...

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Abstract

The invention discloses a preparation method of a carbon-coated ternary cathode material, belonging to the technical field of lithium ion batteries. 11) adding the ternary cathode material and the silicon dioxide precursor into an organic solvent, uniformly mixing, dripping deionized water, stirring for reaction, evaporating all solvent, and calcining to obtain the silicon dioxide-coated ternary cathode material; (2) adding silica coated ternary cathode material and organic carbon source into dispersant to obtain suspension, evaporating and sintering to obtain silica coated ternary cathode material and carbon coated ternary cathode material; (3) immersing the ternary cathode material coated with silicon dioxide and carbon in alkaline solution to obtain the ternary cathode material coated with carbon. A silicon dioxide layer is used as an intermediate protective layer to prevent a carbon source from releasing a reducing gas to reduce a main material in a high-temperature carbonization process, so that a carbon coating formed by the silicon dioxide layer can give full play to its conductivity, thus improving the charging and discharging capacity of a battery at a large current, and further improving the rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a carbon-coated ternary positive electrode material. Background technique [0002] The currently commercialized lithium-ion battery cathode materials are roughly divided into three categories according to their structures: the first category is lithium metal oxide LiMO with a hexagonal layered structure. 2 (M=Co, Ni, Mn), and its representative materials are mainly lithium cobaltate, ternary cathode materials (NCM, NCA), and lithium-rich materials. The second type is materials with a spinel structure, and its representative materials mainly include 4V-level lithium manganese oxide (LiMn 2 o 4 ). The third category is a compound with a polyanion structure, and its representative material is mainly lithium iron phosphate (LiFePO) with an olivine structure. 4 ). [0003] Among them, ternary cathode materials have the characteristics of high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 孙伟霍峰蔚赵海敏郭少华李盛向德波何文祥周翠芳郭鑫李福林
Owner TIANNENG SAFT ENERGY JOINT CO
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