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On the sixth, American Chinese Scientists said that they have developed a new lithium-ion battery based on water-based electrolyte, which not only eliminates the explosion risk of traditional lithium-ion batteries, but the energy density reaches the traditional lithium-ion battery level, which towards the safety lithium ion battery. Take a big step in the direction of practicalization. According to Xinhua News Agency, this work has been completed by Wang Chunsheng, Maryland University, and Dr.
Yang, Dr. Yang, and the US Army Research Laboratory. superior.
"This is the first four-way battery that realizes water-based electrolytic solution. It is very significant basic breakthrough in principle. "Yang Zhongyi and others said in an email for the reporter.
They explained that traditional commercialized lithium-ion batteries use extremely flammable organic electrolyte, severe safety hazards. The problem with which the organic electrolyte is replaced with a non-combustible water-based electrolyte is that the former electrochemical stability window is generally less than 2 volts. Once the electrode voltage exceeds this number, the electrolyte is stable, so the energy density is limited.
They explained that the key to the latest research is to prevent lithium metal or graphite electrodes from direct contact with water molecules in the water-based electrolytic solution, resulting in reduction hydrogen production. To this end, they have developed a very hydrophobic colloidal protective layer material, uniformly covered with the surface of the electrode, effectively preventing the electrode failure caused by water decomposition. More critical is that they found that in the initial charge and discharge cycle, the specific components in the protective layer form a more dense hydrophilic electrolyte interface layer form a more dense hydrophilic surface in situ, further passivation of the negative surface, and this solid body The interface layer can self-repair in the case of local damage to ensure long-term stability of the battery.
Wang Chunsheng and Xukang and others pointed out that the research results provide new directions and ideas for the research and development of high-voltage window safety water-based lithium-ion batteries. From the basis science, "stable 4 volts) can bring many new opportunities to various electrochemical devices.".
At the same time, water-based lithium-ion batteries can save the necessary safety devices in traditional lithium-ion batteries, further reduce the weight of battery components. They emphasized that the current research is only the concept verification in the laboratory, and there is still a very long way to go in a commercialization. Next, they plan to further optimize the chemical composition and battery structure of electrolyte protective layer materials, and increase the battery cycle life, raising the commercialization standards of 500 cycles from now 70 to 100 cycles.
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