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CN-122000340-A - Battery monomer, preparation method thereof, battery device, power utilization device and energy storage device

CN122000340ACN 122000340 ACN122000340 ACN 122000340ACN-122000340-A

Abstract

The application relates to the field of batteries, and provides a battery monomer, a preparation method thereof, a battery device, an electric device and an energy storage device, wherein the preparation method of the battery monomer comprises the steps of providing an electric core component, wherein the electric core component is formed by laminating or winding a positive plate, a diaphragm and a negative plate; the method comprises the steps of providing a shell, placing the battery cell assembly in the shell, providing electrolyte, injecting the electrolyte into the shell, and performing a formation step, wherein the positive plate comprises a positive active component which comprises a modified MXene material, and the modified MXene material comprises a MXene matrix and an Al 2 O 3 /AlF 3 gradient coating layer coated outside the MXene matrix. At least is favorable for remarkably improving electrochemical stability, cycle life and safety performance on the basis of keeping high conductivity of the material.

Inventors

  • CHEN JING
  • SHI HAOTIAN
  • YANG ZIXIANG
  • WU YUHAO

Assignees

  • 浙江晶科储能有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (17)

  1. 1. A method for preparing a battery cell, comprising: providing an electric core component, wherein the electric core component is formed by laminating or winding a positive plate, a diaphragm and a negative plate; providing a shell, and placing the battery cell assembly in the shell; Providing an electrolyte and injecting the electrolyte into the shell; Carrying out a formation step; The positive plate comprises a positive active component, wherein the positive active component comprises a modified MXene material, and the modified MXene material comprises an MXene matrix and an Al 2 O 3 /AlF 3 gradient coating layer coated outside the MXene matrix.
  2. 2. The method for preparing a battery monomer according to claim 1, wherein the general formula of the MXene matrix is Ti 3 C 2 T x ,T x , the number of layers of the MXene matrix is 5-50, the average transverse dimension is 0.5-10 μm, the mole fraction of-F functional groups is 20-60%, the mole fraction of-OH functional groups is 15-50%, and the mole fraction of-O functional groups is 10-40%.
  3. 3. The method of claim 1, wherein the method of preparing the modified MXene material comprises: Preparing an MXene matrix material; And carrying out Al 2 O 3 /AlF 3 gradient coating on the MXene matrix material to form an Al 2 O 3 /AlF 3 gradient coating layer.
  4. 4. The method of claim 3, wherein the method of preparing the MXene matrix material comprises: Pretreating Ti 3 AlC 2 powder, removing water and organic impurities, and adding the pretreated Ti 3 AlC 2 powder into a hydrofluoric acid aqueous solution for reaction to obtain Ti 3 C 2 T x MXene; Performing post-treatment on the Ti 3 C 2 T x MXene in a hydrogen fluoride steam atmosphere to obtain a precursor; dispersing the precursor in tetrabutylammonium water solution with a first concentration, and performing preliminary intercalation at a first temperature to obtain a first intercalation product; Further intercalation is carried out on the first intercalation product in tetrabutylammonium water solution with second concentration at a second temperature to obtain the MXene matrix material; The first concentration < the second concentration, the first temperature < the second temperature.
  5. 5. The method for producing a battery cell according to claim 4, wherein the aqueous hydrofluoric acid solution is 30% -50% by mass.
  6. 6. The method according to claim 4, wherein the first concentration is 0.2mol/L to 0.3mol/L, and the second concentration is 0.7mol/L to 0.8mol/L.
  7. 7. The method of claim 4, wherein the first temperature is 60 ℃ to 70 ℃ and the second temperature is 65 ℃ to 75 ℃.
  8. 8. The method for preparing a battery cell according to claim 3, wherein the gradient coating method comprises: Carrying out atomic layer deposition on an MXene matrix material by using a first deposition solution at a third temperature to form an Al 2 O 3 inner layer; carrying out atomic layer deposition on the surface of the Al 2 O 3 inner layer at a fourth temperature by utilizing a third deposition solution to form an AlF 3 transition layer; carrying out atomic layer deposition on the surface of the AlF 3 transition layer at a fourth temperature by utilizing a second deposition solution to form an AlF 3 outer layer; The first deposition liquid is a mixture of trimethylaluminum and water, the second deposition liquid is a mixture of hydrogen fluoride-pyridine complex, the third deposition liquid is a mixture of the first deposition liquid and the second deposition liquid, and the third temperature is higher than the fourth temperature.
  9. 9. The method for producing a battery cell according to claim 8, wherein the third temperature is 100 ℃ to 120 ℃ and the fourth temperature is 80 ℃ to 100 ℃.
  10. 10. The method for preparing a battery cell according to claim 8, wherein the thickness of the inner layer of Al 2 O 3 is 0.8nm to 1.2nm, the thickness of the transition layer is 0.8nm to 1.0nm, and the thickness of the outer layer of AlF 3 is 1.0nm to 1.8nm.
  11. 11. The method of manufacturing a battery cell according to claim 1, wherein the positive electrode active ingredient further comprises Li 2 MnO 3 co-additive.
  12. 12. The method for preparing a battery monomer according to claim 11, wherein the average particle size of the Li 2 MnO 3 synergistic additive is 10 nm-20 nm, and the specific surface area is 80m 2 /g~150m 2 /g.
  13. 13. The method for preparing a battery cell according to claim 11 or 12, wherein the method for preparing the Li 2 MnO 3 synergistic additive comprises: And dissolving manganese sulfate and lithium hydroxide in deionized water according to a stoichiometric ratio, performing coprecipitation reaction under alkaline conditions, and calcining at 500-600 ℃ to obtain the Li 2 MnO 3 synergistic additive.
  14. 14. A battery cell, comprising: The battery cell assembly is formed by laminating or winding a positive plate, a diaphragm and a negative plate; the battery cell assembly is positioned in the shell; Electrolyte, wherein the electrolyte is positioned in the shell, the cell component is immersed in the electrolyte, The positive plate comprises a positive active component, wherein the positive active component comprises a modified MXene material, and the modified MXene material comprises an MXene matrix and an Al 2 O 3 /AlF 3 gradient coating layer coated outside the MXene matrix.
  15. 15. A battery device, characterized by comprising a battery cell obtained by the preparation method of the battery cell according to any one of claims 1-13 or the battery cell according to claim 14, wherein the battery device comprises one or more of a battery module, a battery pack and an energy storage battery.
  16. 16. An electric power consumption device, characterized in that it comprises a battery device according to claim 15, the battery device is used for providing electric energy.
  17. 17. An energy storage device comprising the battery device of claim 15 for storing electrical energy.

Description

Battery monomer, preparation method thereof, battery device, power utilization device and energy storage device Technical Field The application relates to the field of batteries, in particular to a battery monomer, a preparation method thereof, a battery device, an electricity utilization device and an energy storage device. Background With the increasing demand of acceleration and energy storage technology for global energy transformation, the development of advanced energy storage devices with high energy density and long service life has become an important direction of technological development. While the traditional lithium ion batteries have achieved great success in the consumer electronics and electric automotive fields, the increase in energy density has faced fundamental challenges in the material level. In this context, the positive electrode material is of great importance as a core component for determining the energy density and the operating voltage of the battery, and its technological breakthroughs. The traditional positive electrode material is mainly based on oxidation-reduction reaction of transition metal oxide, realizes energy storage through Li + deintercalation, but is limited by theoretical limit of transition metal valence state change, and has limited capacity improvement space. Meanwhile, in order to obtain higher energy density, the cathode material needs to operate at higher voltage, which puts more stringent demands on electrochemical stability of the material. Disclosure of Invention The application provides a battery monomer, a preparation method thereof, a battery device, an electricity utilization device and an energy storage device, which are at least beneficial to realizing high capacity of the battery monomer, and are suitable for the field of long-time energy storage, such as energy storage systems which continuously run for 4-8 hours under rated power. In a first aspect, the present application provides a method for preparing a battery cell, comprising: providing an electric core component, wherein the electric core component is formed by laminating or winding a positive plate, a diaphragm and a negative plate; providing a shell, and placing the battery cell assembly in the shell; Providing an electrolyte and injecting the electrolyte into the shell; Carrying out a formation step; The positive plate comprises a positive active component, wherein the positive active component comprises a modified MXene material, and the modified MXene material comprises an MXene matrix and an Al 2O3/AlF3 gradient coating layer coated outside the MXene matrix. Optionally, the general formula of the MXene matrix is Ti 3C2Tx,Tx, including at least one of-OH, -O, and-F, the number of layers of the MXene matrix is 5-50, specifically 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, and the average lateral dimension is 0.5 μm-10 μm, specifically 0.5μm、1μm、1.5μm、2μm、2.5μm、3μm、3.5μm、4μm、4.5μm、5μm、5.5μm、6μm、6.5μm、7μm、7.5μm、8μm、8.5μm、9μm、9.5μm、10μm,, where the-F functional group mole fraction is 20% -60%, specifically 20%, 25%, 30%, 35%, 40%, 45, 50, 55, 60%, the-OH functional group mole fraction is 15% -50%, specifically 15%, 20%, 25%, 30%, 35, 40%, 45%, 50%, and the-O functional group mole fraction is 10% -40%, specifically 10%, 15%, 20%, 25%, 30%, 35%, 40%. Optionally, the preparation method of the modified MXene material comprises the following steps: Preparing an MXene matrix material; And carrying out Al 2O3/AlF3 gradient coating on the MXene matrix material to form an Al 2O3/AlF3 gradient coating layer. Optionally, the preparation method of the MXene matrix material includes: Pretreating Ti 3AlC2 powder, removing water and organic impurities, and adding the pretreated Ti 3AlC2 powder into a hydrofluoric acid aqueous solution for reaction to obtain Ti 3C2Tx MXene; Performing post-treatment on the Ti 3C2Tx MXene in a hydrogen fluoride steam atmosphere to obtain a precursor; dispersing the precursor in tetrabutylammonium water solution with a first concentration, and performing preliminary intercalation at a first temperature to obtain a first intercalation product; Further intercalation is carried out on the first intercalation product in tetrabutylammonium water solution with second concentration at a second temperature to obtain the MXene matrix material; The first concentration < the second concentration, the first temperature < the second temperature. Optionally, the mass fraction of the hydrofluoric acid aqueous solution is 30% -50%, and specifically may be 30%, 35%, 40%, 45%, 50%. Optionally, the first concentration is 0.2mol/L to 0.3mol/L, specifically 0.2mol/L、0.21mol/L、0.22mol/L、0.23mol/L、0.24mol/L、0.25mol/L、0.26mol/L、0.27mol/L、0.28mol/L、0.29mol/L、0.3mol/L,, and the second concentration is 0.7mol/L to 0.8mol/L, specifically 0.7mol/L、0.71mol/L、0.72mol/L、0.73mol/L、0.74mol/L、0.75mol/L、0.76mol/L、0.77mol/L、0.78mol/L、0.79mol/L、0.8mol/L. Optionally, the first temperature is 60 ℃ to 70 ℃, specificall