A method for modifying the surface of battery positive electrode materials by using a coupling agent

A battery positive electrode and electrode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., to achieve the effect of improving cycle stability and excellent performance

Active Publication Date: 2020-07-07
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for modifying the surface of the positive electrode material of the battery by using a coupling agent. By functionally modifying the surface of the electrode material, an electrode / electrolyte interface chemically bonded to the solid electrolyte is constructed to solve the problem of solid state in the long cycle process. Solve the problem of solid interface separation to improve the cycle stability of solid-state batteries

Method used

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  • A method for modifying the surface of battery positive electrode materials by using a coupling agent
  • A method for modifying the surface of battery positive electrode materials by using a coupling agent
  • A method for modifying the surface of battery positive electrode materials by using a coupling agent

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Embodiment 1

[0028] This embodiment provides a method for modifying the surface of the positive electrode material of the battery using a coupling agent, such as figure 1 As shown, the method steps are as follows:

[0029] 1. Weigh lithium manganese oxide (LiMn 2 o 4 ) material, put it into a vacuum drying oven for drying treatment.

[0030] 2. Completely dissolve 20g of dry lithium manganate in 30% H 2 o 2 In the aqueous solution, it was refluxed and extracted at 106° C. after standing for 20 minutes.

[0031] 3. Dissolve 5g of γ-(2,3-propylene oxide)propyltrimethoxysilane in 60mL of water-ethanol mixture, stir evenly, and add the lithium manganate material prepared in step 2 to make the two After extensive contact for 3 h, the solution was filtered and dried, and the material was vacuum dried at 80 °C for 12 h.

[0032] 4. Weigh 2.5g of polyoxyethylene and dissolve it in anhydrous acetonitrile, then add 0.9g of LiN(CF 3 SO 3 ) 2 After mixing, stir for 12 hours, and then disperse...

Embodiment 2

[0035] This embodiment provides a method for modifying the surface of the positive electrode material of the battery using a coupling agent, such as figure 1 As shown, the method steps are as follows:

[0036] 1. Weigh lithium cobalt oxide (LiCoO 2 ) material, put it into a vacuum drying oven for drying treatment.

[0037] 2. Completely dissolve 20g of dry lithium cobaltate in 30% H 2 o 2 In the aqueous solution, it was refluxed and extracted at 106° C. after standing for 20 minutes.

[0038] 3. Dissolve 5g of γ-aminopropyltriethoxysilane in 60mL of water-ethanol mixture, stir evenly, and add the lithium cobaltate material prepared in step 2. After the two are fully contacted for 3 hours, the solution After drying by filtration, the material was vacuum dried at 80 °C for 12 hours.

[0039] 4. Weigh 2.5g of polyacrylonitrile and dissolve it in acetone, then add 0.9g of LiPF to it 6After mixing, stir for 12 hours, and then disperse the material obtained in Step 3 and 2.5 g...

Embodiment 3

[0041] This embodiment provides a method for modifying the surface of the positive electrode material of the battery using a coupling agent, such as figure 1 As shown, the method steps are as follows:

[0042] 1. Weigh lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) material, put it into a vacuum drying oven for drying treatment.

[0043] 2. Completely dissolve 20g of dried lithium nickel manganese oxide in 30% H 2 o 2 In the aqueous solution, it was refluxed and extracted at 106° C. after standing for 20 minutes.

[0044] 3. Dissolve 5g of γ-aminopropyltriethoxysilane in 60mL of water-ethanol mixture, stir evenly, and add the lithium nickel manganese oxide material prepared in step 2. After the two are fully contacted for 3 hours, put The solution was dried by filtration and the material was dried under vacuum at 80°C for 12 hours.

[0045] 4. Weigh 2.5g of polymethyl methacrylate and dissolve it in acetone, then add 0.9g of LiPF to it 6 After mixing, stir for 1...

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Abstract

The invention discloses a method for modifying a battery positive electrode material surface by a coupling agent. The method comprises the steps of performing electrode material surface activation, introducing an active group to be reacted with a coupling agent solution to form chemical bond connection; and enabling the coupling agent modified electrode material to be uniformly mixed with a polymer electrolyte material and a conductive agent in a proper solvent, and performing drying to prepare a composite electrode. By performing functional modification on the electrode material surface, an electrode / electrolyte interface chemically bonded with a solid electrolyte is constructed, so that the problem in solid-solid interface separation in the long-circulation process is solved, the cycle stability of the solid-state battery is improved; and the materials disclosed in the invention are easily available, the prepared composite electrode is excellent in performance, too much instrument equipment is not needed, and large-scale preparation can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacture and electrochemical reaction, and relates to a method for modifying the surface of a positive electrode material of a battery by using a coupling agent to improve the interfacial contact wetting property of a solid-state battery material. Background technique [0002] Lithium-ion batteries are being used more and more widely in real social life. However, the organic electrolyte used in traditional lithium-ion batteries has the advantages of high ionic conductivity, easy control of the electrode / electrolyte interface, and convenient processing. However, the flammability of the organic electrolyte makes the battery a great safety hazard, especially when the capacity is large, and the limited electrochemical window makes it encounter many difficulties in the high-voltage battery system. Solid-state batteries assembled with solid electrolytes with high ionic conductivity are ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 高云智孙震曹毅付传凯田宇
Owner HARBIN INST OF TECH
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