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Introduction of several new materials for lithium batteries

wallpapers Tech 2021-01-08
1. Boron nitride nano-coating of new materials for lithium batteries
Columbia University stabilized the electrolyte in lithium-ion batteries by implanting boron nitride (BN) nano-coatings, thereby reducing the risk of battery short circuits.
Breakthrough: The liquid electrolyte inside the lithium-ion battery is highly flammable, and there is a risk of short circuit and fire. However, the 5 to 10-nanometer boron nitride (BN) nanofilm can be used as a protective layer to isolate the metal lithium and the electrolyte. For electrical contact, boron nitride (BN) nano-film is chemically and mechanically stable to lithium and has a high level of electronic insulation, so it can improve the safety of lithium-ion batteries to a greater extent.
2. Amorphous Al2O3 coating for new battery materials
Researchers at Hanyang University in South Korea used amorphous Al2O3 to improve the surface of graphite. The amorphous Al2O3 coating greatly improved the wettability of graphite and other battery materials and battery separators. Researchers used LiCoO2 cathodes and Al2O3 coated graphite anodes to carry out pure cell tests. Tests have shown that the introduction of amorphous Al2O3 can improve the charging performance of graphite anode materials. The results have been published in Energy Magazine.
At a high charging rate of 4000mA/g, the reversible capacity of surface-modified graphite is about 337.1mAh/g, of which Al2O3 accounts for 1% of the weight. When the electric strength is 100?mA/g, the corresponding capacitance The possession is about 97.2%. Researchers predict that the coating increases the electrolyte permeability of the entire surface area of ​​the graphite electrode, thereby improving the fast charging performance of the graphite anode material. This achievement improves the fast charging performance of graphite anode materials for lithium-ion batteries.
3. Porous silicon-based composite anode (ASD-SiOC) of new materials for lithium batteries
The research team of Professor Yang Jianping and the research team of Professor Jiang Wan from the School of Materials Science and Engineering of Donghua University have made important progress in the field of silicon-based lithium-ion batteries. The research team selected a phenyl bridged organosilicon precursor and used a two-step reaction of the sol-gel method and high-temperature calcination to prepare a new porous silicon-based composite anode (ASD-SiOC) that exhibits excellent cycle stability And structural stability. The results have been published in "Germany Applied Chemistry".
This new design has many advantages: the active matrix SiOx unit and carbon can be combined at the atomic scale; the carbon three-dimensional network effectively improves the conductivity of the material; the porous structure not only buffers the volume expansion but also accelerates the transmission of lithium ions; In the subsequent cycle process, the ASD-SiOC anode can be transformed into a more stable composite structure, which can achieve high coulombic efficiency. This study shows that carbon distribution plays a very important role in maintaining the structure and performance stability of the composite anode material.
4. Silicon nanoparticles, new materials for lithium batteries
The team of chemist Break at the University of Alberta in Canada found that molding silicon into nano-sized particles helps prevent it from breaking. The researchers tested four silicon nanoparticles of different sizes and found that the smallest particles (only one part of a meter in diameter) exhibited the best long-term stability after multiple charges and discharge cycles.
This achievement overcomes the limitations of using silicon in lithium-ion batteries. This discovery may result in a new generation of batteries with 10 times the capacity of current lithium-ion batteries, a critical step towards the manufacture of a new generation of silicon-based lithium-ion batteries. The research has broad application prospects, especially in the field of electric vehicles, which can make it travel farther, charge faster, and battery weight is lighter.

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