According to foreign media reports, a group of researchers at Hanyang University in South Korea used amorphous Al2O3 to achieve surface modification of graphite, which is an efficient way to improve the quality of graphite anode materials for lithium-ion batteries. Fast charging performance.
The researchers published a paper in the Journal of Power Sources. At a high charging rate of 4000 mA / g, the reversible capacity of the surface-modified graphite is about 337.1 mAh / g, of which Al2O3 The weight ratio is 1%, and when the electric strength is 100 mA / g, the corresponding capacitance retention is about 97.2%.
In order to solve the technical deficiencies of lithium-ion batteries, it is particularly important to find suitable battery materials. While achieving ultra-fast charging rates, it ensures the electrochemical performance and safety of the batteries. To achieve this goal, various strategies have been adopted to improve the charging capacity of lithium-ion batteries, and have achieved varying degrees of success.
Obviously, the wettability between the electrolyte and the electrode plays an important role, and this factor determines the electrochemical performance of the lithium-ion battery.
In this study, amorphous Al2O3 coating can greatly improve the wettability of battery materials such as graphite and battery separators. According to the researchers' prediction, the coating can increase the electrolyte permeability of the entire surface area of ​​the graphite electrode, thereby improving the fast charging performance of the graphite anode material.
The researchers used a LiCoO2 cathode and a graphite anode coated with Al2O3 to conduct a pure battery test. The test proved that the introduction of amorphous Al2O3 can provide the charging performance of the graphite anode material.
Wetability tests and electrochemical impedance spectroscopy analysis show that the improvement of fast charging performance is attributed to the Al2O3 coating on the graphite surface, which improves the wettability of the electrolyte on the graphite.
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