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(Beilu Advanced University of Science and Technology)

It is known that after the use of smart phones for more than one year, the charge of lithium batteries will decrease, and the service life of mobile phones will decrease, which will indirectly lead to economic losses and pollution. In addition, the short life of lithium battery also hinders the development of renewable energy recovery and electric vehicle market. Therefore, scientists have been trying to find ways to improve the life of lithium batteries.

One of the key reasons for the reduction of lithium battery capacity over time is the degradation of widely used graphite anode (i.e. battery cathode). The anode and electrolyte (the medium carrying the charge between the positive and negative poles of the battery) and the cathode (or the positive pole of the battery) can provide a good environment for the electrochemical reaction of the battery charge discharge cycle. However, in order to prevent the use of graphite from fission, an adhesive should be added to the graphite. Nowadays, the most widely used adhesive is polyvinylidene fluoride (PVDF), but it has shortcomings and is far from the ideal material.

It is reported that in order to solve the above problems, the research team of Beilu Advanced University of Science and Technology (JAIST) invented a new adhesive made of bisimino naphthoquinone p-phenylene (BP) copolymer. First, compared with PVDF adhesive, BP adhesive can provide better adhesion and mechanical stability for negative electrode. Part of the reason is that there is a supposed pi between graphite and bis imino naphthoquinone groups-& pi; There is excellent adhesion between copolymer ligand and battery copper collector. Secondly, BP copolymer is more conductive than PVD, and a thinner conductive solid electrolyte interface with lower resistance can appear. Third, BP copolymer is not easy to react with electrolyte, which greatly prevents degradation.

As shown in the test, the BP copolymer can also greatly enhance the battery performance. Noriyoshi Matsumi, professor of JAIST, said that the half battery using PVDF as binder was only 65% of its original capacity after about 500 charge discharge cycles, while the half battery using BP copolymer as binder still showed 95% of its capacity after 1700 charge discharge cycles.

Semi batteries using BP copolymers show extremely high and stable coulombic efficiency, which also proves that the battery is durable and durable. Coulomb efficiency refers to the ratio of the discharge capacity of the battery to the charging capacity in the same cycle. The research team used an electron microscope to photograph the adhesive before and after circulation. The photo shows that only small cracks appear on the BP copolymer, while large cracks appear on the PVDF adhesive when the number of cycles is less than one third of the total.

The experimental and theoretical results of this research will provide new methods for designing durable lithium batteries, which will have far-reaching environmental and economic effects. As Professor Matsumi said, the invention of durable batteries will help to develop more reliable and long-term usable products, thus encouraging consumers to buy expensive battery products, such as long-term usable electric vehicles.

Professor Matsumi also added that the development of durable batteries would benefit many people, such as those suffering from heart disease and other artificial organs. In addition, with the increase in the number of daily charging devices such as laptops, tablets and smartphones, the general population will also benefit from this. Other developments in electrode adhesives are also expected to enable scientists to produce battery products with longer life, thereby realizing a greener future.

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