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Composite carbon-coated metal oxide and preparation method thereof

A composite carbon and oxide technology, applied in electrochemical generators, structural parts, electrical components, etc., can solve the problems of poor cycle performance and rate performance, and achieve good rate performance, easy control, and improved electrochemical performance.

Inactive Publication Date: 2019-07-02
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal oxides have poor cycle performance and rate performance compared with carbon anode materials.

Method used

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  • Composite carbon-coated metal oxide and preparation method thereof
  • Composite carbon-coated metal oxide and preparation method thereof
  • Composite carbon-coated metal oxide and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0016] Such as figure 1 Shown, the preparation method of composite carbon-coated metal oxide of the present invention, its steps are:

[0017] (1) Metal oxide surface modification: the metal oxide M x o z Mix with the coupling agent at a mass ratio of 1:1 to 1:20, and in the mass ratio M x o z : Ethanol=1:20~1:50 Add ethanol, reflux at 30℃ for 20~40h, then filter, wash, and then dry at 60℃ for 10~30h;

[0018] (2) Metal oxide surface-coated ionic liquid polymer: M obtained in step (1) x o z According to the mass ratio M x o z : Ethanol=1:20~1:50 Add ethanol, ultrasonically disperse for 1~10h; x o z : Acrylonitrile=1:1~1:10 Add acrylonitrile monomer, with mass ratio M x o z : Ionic liquid=1:1~1:10 Add ionic liquid monomer; use azobisisobutyronitrile as initiator, the total mass ratio of initiator to monomer is 0.01:1~0.1:1; use polyethylene glycol Diacrylate (PEGDA-200) is used as a cross-linking agent, and the total mass ratio of cross-linking agent to monomer is 0...

Embodiment 1

[0024] 6.0gCo 3 o 4 Add 200mL of ethanol, add 50.0g of coupling agent KH570, reflux at 30°C for 24h, filter, wash and dry at 60°C for 12h to obtain surface-modified Co 3 o 4 Powder; add 200mL of ethanol to the powder and ultrasonically disperse for 10min, then add 9.0g of acrylonitrile, 1.0g of 1-allyl-3-methylimidazolium tetrafluoroborate, 0.04g of azobisisobutyronitrile and 0.2g of polyethylene glycol diacrylate (PEGDA-200) was refluxed at 70°C for 4h under the protection of an inert gas to obtain ionic liquid polymer-coated Co 3 o 4 . Co coated with ionic liquid polymer 3 o 4 Heated in a microwave oven protected by an inert atmosphere for 30min to obtain composite carbon-coated Si 4+ Doped Co 3 o 4 Powder (XRD such as figure 2 shown).

[0025] The battery performance test of the obtained powder materials adopts CR2025 button batteries, which are assembled in a glove box filled with an inert atmosphere. The positive electrode is made of metal lithium sheet, and ...

Embodiment 2

[0027] 6.0gCo 3 o 4 Add 200mL ethanol, add 50.0g coupling agent XY-11, reflux at 30°C for 24h, filter, wash and dry at 60°C for 12h to obtain surface-modified Co 3 o 4 Powder; add 200mL of ethanol to the powder and ultrasonically disperse for 10min, then add 9.0g of acrylonitrile, 1.0g of 1-allyl-3-methylimidazolium tetrafluoroborate, 0.04g of azobisisobutyronitrile and 0.2g of polyethylene glycol diacrylate (PEGDA-200) was refluxed at 70°C for 4h under the protection of an inert gas to obtain ionic liquid polymer-coated Co 3 o 4 . Co coated with ionic liquid polymer 3 o 4 Heated in a microwave oven protected by an inert atmosphere for 30min to obtain composite carbon-coated Ti 4+ Doped Co 3 o 4 Powder.

[0028] The battery was assembled according to the method of Example 1 and tested. Under the condition of charge and discharge rate of 0.5C, the initial discharge capacity of the material reached 840mAh / g, and the capacity retention rate after 50 cycles was 89.4%. ...

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Abstract

The invention discloses a composite carbon coated metal oxide and a preparation method thereof; the composite carbon coated metal oxide has the general formula of MxOy / CaNbBcPd, wherein CaNbBcPd is a nitrogen or boron or phosphorus doped composite carbon material. The method comprises the steps: firstly, carrying out surface modification on a metal oxide MxOy, then coating the surface of the metal oxide with a layer of an ionic liquid polymer, and then carrying out microwave cracking of the ionic liquid polymer on the surface of the metal oxide to obtain the composite carbon coated metal oxide. A metal oxide surface carbon film contains nitrogen, boron, phosphorus and other elements, so as to be more conducive to transfer of electric charges on the surface of the metal oxide, so that the composite carbon coated metal oxide as a lithium ion negative electrode material has good cycle performance and rate performance.

Description

technical field [0001] The invention relates to the preparation technology of lithium ion battery negative pole material. Background technique [0002] Improving the performance of lithium-ion battery anode materials is one of the key factors to improve the performance of lithium-ion batteries. The capacity of metal oxide anode materials (oxides of Sn, Fe, Ni, Cu, Si, Mo, etc.) is higher than that of commercial carbon anode materials, so the application research of metal oxides as anode materials for lithium-ion batteries has become one of the current research hotspots. one. However, metal oxides have poor cycle performance and rate capability compared with carbon anode materials. In order to improve the cycle stability and rate performance of metal oxide anode materials, it is an important modification method to coat a layer of electrochemically active materials with lithium storage capacity on the surface of metal oxide anode materials. Coating the carbon layer on the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/502H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 蒙延双朱福良王功瑞张定军
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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