Positive electrode active material for lithium ion battery, preparation method thereof, positive electrode, preparation method thereof and battery
A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle and rate performance of lithium-ion batteries, and achieve the effect of improving cycle performance and rate performance and reducing consumption
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0023] The present invention also provides a method for preparing a positive electrode active material of a lithium ion battery, wherein the steps include:
[0024] S1, mixing carbon-coated lithium iron phosphate with a carbonate compound and / or sulfonate compound solution containing a lithium salt;
[0025] S2, filtering, washing and drying the mixed solution obtained in step S1 to obtain a positive electrode active material.
[0026] Preferably, the more detailed preparation method steps of the positive electrode active material of the above-mentioned lithium ion battery include:
[0027] S1, mixing carbon-coated lithium iron phosphate powder with a carbonate compound and / or sulfonate compound solution containing lithium salt, and stirring the mixed solution at 25°C~90°C for 24-72 hours;
[0028] S2, filtering the mixed solution obtained in step S1 to obtain an intermediate powder, washing the intermediate powder, and drying in vacuum to obtain a positive electrode active m...
Embodiment approach
[0045] Among them, the separator can be selected from various separators used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.
[0046] The electrolyte contains lithium salt and non-aqueous solvent. The lithium salt can be lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium perfluorobutylsulfonate, aluminate One or more of lithium, lithium chloroaluminate, lithium fluorosulfonyl imide, lithium chloride and lithium iodide; the non-aqueous solvent can be γ-butyrolactone, ethyl methyl carbonate, methyl propyl carbonate , dipropyl carbonate, acid anhydride, N-methylpyrrolidone, N-methylformamide, N-methylacetamide, acetonitrile, N,N-dimethylformamide, sulfolane, dimethylsulfoxide, disulfite ...
Embodiment 1
[0051] (1) Preparation of positive electrode active material:
[0052] Accurately weigh 100g of carbon-coated lithium iron phosphate powder, prepare 250g, 1.0mol / L mixed solution of EC+DMC (volume ratio 1:1) containing LiPF6 (containing 1%wt VC), and add the powder to the above The solution was stirred at a high temperature of 60° C. for 48 hours, filtered and washed, and vacuum-dried at 120° C. to obtain positive electrode active material S1.
[0053] (2) Preparation of positive electrode:
[0054] Add 100g of positive electrode active material S1, 5g of polyvinylidene fluoride (PVDF), 5g of conductive agent SP (super conductive carbon black), and 120g of N-methylpyrrolidone into a vacuum mixer and stir to form a uniform positive electrode slurry. The positive electrode slurry was uniformly coated on both sides of an aluminum foil with a thickness of 16 microns, then dried at 150° C., rolled and cut to obtain positive electrode sheets.
[0055] (3) Preparation of simulated ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Average pore size | aaaaa | aaaaa |
| Thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More