Application of polymer coating in aluminum negative electrode, aluminum negative electrode, its preparation method and secondary battery
A polymer coating and polymer material technology, applied in the field of electrochemical energy storage devices, can solve the problems of unstable solid electrolyte membrane capacity attenuation, inability to effectively improve volume expansion, SEI membrane instability, etc., and achieve capacity retention High Coulombic efficiency, reduced irreversible capacity, and excellent electrochemical performance
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[0119] According to the third aspect of the present invention, there is provided a method for preparing the aluminum negative electrode, including the following steps:
[0120] Mix the polymer material, the optional lithium ion conductor, the optional conductive agent and the optional surfactant into a slurry, and coat it on the aluminum negative electrode; or,
[0121] The polymer material, the lithium ion conductor, the conductive agent and the surfactant are separately made into corresponding slurries, and then the corresponding slurries are respectively coated and dried to obtain an aluminum negative electrode.
[0122] In the preparation method of the aluminum negative electrode of the present invention, the coating materials are mixed into a slurry and coated on the aluminum negative electrode, or the coating materials are separately prepared into a slurry, and then separately coated, the production process is simple and the cost is low.
[0123] As a preferred embodiment, weigh ...
Embodiment 1
[0147] Dissolve 1 g of polyvinyl alcohol in 10 g of water, stir evenly to form a completely uniform solution, add an appropriate amount of phytic acid solution, and after uniformly stir, add an appropriate amount of Al nanoparticle dispersion and stir for 2 hours to form a slurry. The slurry is coated with a coater to form a film on the surface of the aluminum foil, and then dried in a vacuum oven at 80°C for 8 hours to completely remove the solvent water. Cut the dried aluminum foil to obtain the aluminum negative electrode metal foil / current collector of the required size.
[0148] Use aluminum anode metal foil / current collector as anode, use LiPF 6 / EC:DEC (v:v=4:6) is the electrolyte, and the battery is assembled with lithium iron phosphate as the positive electrode.
Embodiment 2-20
[0150] The difference between Example 2-20 and Example 1 is that the selected polymer materials are different, and the rest of the steps are the same. The performance test of the battery obtained in Example 2-20 is performed and the performance of Example 1 is compared. The battery test includes the capacity retention rate and coulomb efficiency of 500 cycles, using conventional battery test methods. The specific test method is as follows:
[0151] Cyclic charge and discharge: Cyclic charge and discharge are carried out on the CT2001C-001 blue battery cycle test system, charge and discharge at a rate of 0.5C (100mAh / g) to test the standard capacity of the electrode, the specific capacity of the material = current * time / sample quality, The coulombic efficiency of the material = the discharge capacity of the material / the charge capacity of the material. The charging and discharging conditions depend on the needs of the experiment. The cycle steps include: standing for 60s-consta...
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