Lithium battery performance breakthrough

The performance of lithium battery breakthrough has attracted much attention in the battery industry of silicon anode for lithium ion batteries, compared with the current use of graphite anode, high capacity lithium battery performance breakthrough after graphite can provide 3-5 times, greater capacity means that every time after charging, the battery time is longer, it can prolong the electric vehicle mileage. Graphite lithium battery performance breakthrough new development although silicon rich and cheap, but the Si anode charge discharge cycles, during each discharge cycle, the volume will be greatly expanded, and even its capacitance attenuation, will cause the phenomenon of electrode layer particles or film electrode fracture.

The performance of lithium battery Jang Wook Choi breakthrough was led by Professor Ali and Professor Coskun KAIST research group reported in July 20th for a large capacity lithium ion battery anode silicon molecular pulley binder, the KAIST team will molecular pulley (called polyrotaxane) integrated into cell electrode binder, including polymer lithium battery performance breakthrough in batteries, so that the electrodes attached to the metal substrate. The ring in the rotor is screwed into the polymer skeleton and can move freely along the skeleton.

Polyrotaxane breakthrough performance of lithium batteries in the ring with the volume change of silicon particles and move freely, the sliding ring can effectively maintain the particle shape of Si, so that it will not disintegrate in the continuous process of volume change. It is worth noting that the performance of the lithium battery breaks down because of the high elasticity of the polyurethane binder, even if the crushed silicon particles can keep the coalescence state. The function of the new adhesive is in sharp contrast to the existing binder (usually a simple linear polymer), and the existing adhesive is of limited elasticity and therefore can not firmly retain the particle shape. The previous adhesive would scatter the crushed particles, which would reduce or even lose the capacity of the silicon electrode.

The author believes that this breakthrough performance of lithium batteries is an excellent demonstration of the importance of basic research, Polyrotaxane last year by virtue of the concept of "mechanical bond" won the Nobel prize for "mechanical combination" is a newly defined concept, can be added to the classical chemical bonds, such as covalent bond, ionic bond, coordination bonding and metal bond; based on the long-term performance of the lithium battery breakthrough is with unexpected speed, gradually solve the long-standing challenges in battery technology direction. The author also mentioned that they are currently working with a large battery manufacturers, the molecular pulley integrated into actual battery products, car ads lithium battery then do not be made using graphene, graphene lithium battery Nakai not sold.

Graphite lithium battery performance breakthrough new development: Northwestern University 2006 Noble Laureate prize winner Sir Stoddart Fraser added: "mechanical bond in storage for the first time recovery environment, the KAIST team cleverly used poly rotaxane in mechanical ring binder, function in the PEGylated alpha cyclodextrin ring on the spiral. The performance of lithium graphite lithium battery performance breakthrough after the break marks the performance of lithium ion battery market breakthrough, when conventional materials like polymer binder pulley with mechanical rather than chemical bonding alone, this will give physical key material properties and device performance has very significant effect."

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