Positive electrode material and preparation method thereof, positive plate and secondary battery
A technology of positive electrode material and synthesis method, which is applied in secondary batteries, positive electrodes, battery electrodes, etc., can solve the problems of unstable sodium-based layered materials, poor cycle performance, and easy phase transition, etc., and achieve good cycle life, Effect of suppressing surface lattice distortion and reducing surface alkalinity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0038] The preparation method of the positive electrode material of the present invention has good controllability and can be mass-produced.
[0039] A preparation method of a positive electrode material, comprising the following steps:
[0040] Step S1, using a synthetic method to prepare core particles;
[0041] Step S2, selecting a coating material, and coating the inner core particles on the surface to form a coating layer to obtain a positive electrode material.
[0042] Preferably, the synthesis method in the step S1 includes one of a solid-phase reaction method, a co-precipitation method, and a sol-gel method.
[0043] Preferably, the method for surface coating in the step S2 includes one of a sol-gel method, an atomic layer deposition method, a magnetron sputtering method, and a mechanical fusion method.
[0044] Preferably, when the synthesis method is a solid-phase reaction method, 1% to 10% of the sodium supplement material is added.
[0045] A positive electrode...
Embodiment 1
[0055] Press Na 0.98 [Mn 0.36 Fe 0.32 Ni 0.28 Li 0.04 ]O 2 Stoichiometric ratio, the material was prepared using a direct solid-phase reaction method. According to the stoichiometric ratio, Na 2 CO 3 , MnO 2 , Fe 2 O 3 , NiO, Li 2 CO 3 Mix evenly, and obtain the precursor after ball milling. The ball milling time is 15 hours, and the rotation speed is 350rpm / min. Then the precursor is placed in a muffle furnace, and the O3 type layer is obtained after calcining at 850 ° C in an air atmosphere for 15 hours. material with a particle size of 16 microns. The above product was then combined with commercially purchased LiMn 2 O 4 Mix well, use a fusion machine for mechanical fusion, where Na 0.98 [Mn 0.36 Fe 0.32 Ni 0.28 Li 0.04 ]O 2 with LiMn 2 O 4 The weight ratio is 100:1. The product was analyzed by XRD, it was O3 phase, analyzed by SEM, LiMn 2 O 4 will Na 0.98 [Mn 0.36 Fe 0.32 Ni 0.28 Li 0.04 ]O 2 Uniform and complete coating to form a 3nm thick c...
Embodiment 2
[0057] Press Na 0.96 [Mn 0.36 Fe 0.32 Ni 0.20 Cu 0.12 ]O 2 Stoichiometric ratio, the material was prepared using a sol-gel method combined with a solid-phase reaction method. According to the stoichiometric ratio, NaNO 3 , Mn(NO 3 ) 2 , Ni(NO 3 ) 2 , Cu(NO 3 ) 2 , Fe(NO 3 ) 2 Mixed in deionized water, stirred to obtain a sol, then added citric acid, fully stirred at 60 °C to obtain a gel precursor, and then placed the precursor in a muffle furnace, and roasted at 850 °C for 10 hours in an air atmosphere Then, an O3-type layered material was obtained, and the particle size was 15 microns. The above product was then combined with commercially purchased Mn 2 O 7 Mix well, use a fusion machine for mechanical fusion, where Na 0.96 [Mn 0.36 Fe 0.32 Ni 0.20 Cu 0.12 ]O 2 with Mn 2 O 7 The weight ratio is 100:2. The product is O3 phase by XRD analysis, Mn is analyzed by SEM 2 O 7 will Na 0.96 [Mn 0.36 Fe 0.32 Ni 0.20 Cu 0.12 ]O 2 A coating layer with a ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Particle size | aaaaa | aaaaa |
| Thickness | aaaaa | aaaaa |
| Particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More