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CN-121983671-A - Battery monomer and preparation method thereof, battery device, power utilization device and energy storage device

CN121983671ACN 121983671 ACN121983671 ACN 121983671ACN-121983671-A

Abstract

The application relates to the field of batteries, and provides a battery monomer and 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, providing a shell, placing the electric core component in the shell, providing electrolyte, injecting the electrolyte into the shell, and performing a formation step, wherein the electric core component is formed by laminating or winding a positive plate, a diaphragm and a negative plate, and the electrolyte contains a bifunctional additive with the molecular formula: Wherein R 1 is an electron withdrawing group, and R 2 is an electrochemical controllable decomposition group. The application is at least beneficial to solving the key technical problems of slow electron transmission, large ion diffusion resistance, aggravated interface side reaction and the like in the lithium iron phosphate quick-charging battery.

Inventors

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

Assignees

  • 浙江晶科储能有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (15)

  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 electrolyte contains a bifunctional additive, and the molecular formula of the bifunctional additive is as follows: Wherein R 1 is an electron withdrawing group, and R 2 is an electrochemical controllable decomposition group.
  2. 2. The method for preparing a battery cell according to claim 1, wherein the electron withdrawing group comprises at least one of-CF 3 、-C 2 F 5 、-OCF 3 , -CN.
  3. 3. The method of claim 1, wherein the electrochemically controllable decomposition groups comprise at least one of-SO 2 CF 3 、-SO 2 C 2 F 5 .
  4. 4. The method for preparing a battery cell according to claim 1, wherein the mass fraction of the bifunctional additive in the electrolyte is 0.05% -2.0%.
  5. 5. The preparation method of the battery monomer according to any one of claims 1 to 4, wherein the preparation method of the bifunctional additive comprises the steps of introducing an electron withdrawing group at the 10 th site of phenothiazine to obtain an intermediate, and introducing an electrochemical controllable decomposition group at the 3 rd site of a phenothiazine skeleton of the intermediate through electrophilic aromatic substitution reaction.
  6. 6. The method for producing a battery cell according to claim 5, wherein the production of the intermediate comprises: The method comprises the steps of providing phenothiazine and a reagent containing electron withdrawing groups, and carrying out a reaction at 80-120 ℃ under the catalysis of a palladium-containing catalyst under the protection of inert gas and under the alkaline condition to obtain an intermediate.
  7. 7. The method for producing a battery cell according to claim 6, wherein the alkaline condition is provided by cesium carbonate.
  8. 8. The method for producing a battery cell according to claim 6, wherein the palladium-containing catalyst comprises at least one of tetrakis (triphenylphosphine) palladium, [1,1' -bis (diphenylphosphine) ferrocene ] palladium dichloride, bis (tri-t-butylphosphine) palladium, and palladium acetate.
  9. 9. The method of claim 5, wherein the electrophilic aromatic substitution reaction comprises: And (3) taking the reagent containing the electrochemical controllable decomposition group and the intermediate as raw materials, and reacting at 0-25 ℃ to obtain the bifunctional additive.
  10. 10. The method of manufacturing a battery cell according to claim 1, wherein the solvent of the electrolyte comprises a carbonate.
  11. 11. The method for producing a battery cell according to claim 10, wherein the carbonate comprises at least one of vinylene carbonate, fluoroethylene carbonate, dimethyl carbonate, propylene carbonate, diethyl carbonate, and methylethyl carbonate.
  12. 12. A battery cell prepared by the method of any one of claims 1 to 11, comprising: the lithium ion battery comprises a shell, and a positive plate, a diaphragm, a negative plate and electrolyte which are arranged in the shell, wherein the diaphragm is arranged between the positive plate and the negative plate.
  13. 13. A battery device, characterized by comprising a battery cell obtained by the preparation method of the battery cell according to any one of claims 1-11 or the battery cell according to claim 12, wherein the battery device comprises one or more of a battery module, a battery pack and an energy storage battery.
  14. 14. An electric power consumption device, characterized in that it comprises a battery device according to claim 13, the battery device is used for providing electric energy.
  15. 15. An energy storage device comprising the battery device of claim 13 for storing electrical energy.

Description

Battery monomer and 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 The lithium iron phosphate battery is widely applied to the fields of electric automobiles, energy storage systems and the like due to the excellent safety performance, good cycle stability, rich raw material resources and relatively low cost, and particularly plays a dominant role in the fields of large-scale energy storage power stations and electric buses with high safety requirements. With the rapid development of the electric automobile market and the continuous improvement of the requirements of users on the convenience of charging, the rapid charging technology has become one of the key bottlenecks for restricting the popularization of electric automobiles. The ideal quick charging technology can complete the charging process from 10% to 80% within 15-20 min, and meanwhile, good cycle life and safety performance are maintained. 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 solving the key technical problems of slow electron transmission, large ion diffusion resistance, aggravated interface side reaction and the like in a lithium iron phosphate quick-charging battery. In one 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 electrolyte contains a bifunctional additive, and the molecular formula of the bifunctional additive is as follows: Wherein R 1 is an electron withdrawing group, and R 2 is an electrochemical controllable decomposition group. The difunctional additive adopts an accurate molecular design concept, and a synergistic system with electron transmission promotion and interface stability is constructed through the coordination effect of a phenothiazine skeleton and the film-forming characteristic of fluorine-containing groups. The phenothiazine skeleton constitutes the core structural unit of the molecule, and a tricyclic ring system formed by fusing a benzene ring and a thiazine ring. The skeleton has a pi conjugated system rich in electrons and N, S double hetero atom coordination sites, and provides a structural basis for electron transmission and metal ion coordination. The HOMO energy level of the phenothiazine skeleton is between-5.8 eV and-6.2 eV, and the LUMO energy level can be regulated and controlled within the range of-2.8 eV to-3.5 eV through substituents. The N-10 electron withdrawing group plays a key role in accurately regulating and controlling the molecular electronic structure. The group obviously reduces the LUMO energy level of molecules to-3.2 eV through a strong electron-withdrawing effect, and the energy level range is precisely matched with the oxidation-reduction potential (3.45vvs. Li/Li +) of lithium iron phosphate, so that the thermodynamic driving force and kinetic reversibility of electron transmission are ensured. The 3-site electrochemistry controllable decomposition group bears an in-situ film forming function, and a selective decomposition reaction occurs under an electrochemistry condition, wherein the group has moderate bond energy (such as about 280 kJ/mol-320 kJ/mol of S-CF 3 bond energy), can undergo controllable decomposition in a 3.0V-4.0V potential window, and generates film forming components such as LiF nano particles, fluoroalkyl chains and the like, and a solid electrolyte interface film (SEI) rich in LiF is constructed in situ. Optionally, the electron withdrawing group comprises at least one of-CF 3、-C2F5、-OCF3, -CN. Optionally, the electrochemically controllable decomposition groups include at least one of-SO 2CF3、-SO2C2F5. Specifically, the molecular formula of the bifunctional additive may be as follows: 、、 、、 、。 Optionally, the mass fraction of the bifunctional additive in the electrolyte is 0.05% -2.0%. Optionally, the preparation method of the bifunctional additive comprises the steps of introducing electron withdrawing groups at 10 positions of phenothiazine to obtain an intermediate, and introducing electrochemical controllable decomposition groups at 3 positions of a phenothiazine skeleton of the intermediate through electrophilic aromatic substitution reaction. Optionally, the preparation of the intermediate comprises: The method comprises the steps of providi