From the mobile phone, 3 c products to electric vehicles or large energy storage power plant, the lithium ion battery is everywhere, as the energy storage technology mainstream, but have always been a security nature, so many scientists are trying to find out all kinds of solutions.According to Nano Letters, a journal of the American chemical society, scientists have found that nanowires not only reduce the flammability of lithium-ion batteries, but also improve battery performance.
Ion electrolyte on both ends of the electrode through mobile, while the traditional battery electrolyte is made out of salt and organic solvents, as one of the most mature and most widely used technology, but easy to evaporate, and may cause fire, so researchers have turned to a solid electrolyte, and put forward a lot of potential options.
The polymer electrolyte is a potential new force, which has the advantages of stability, cheap and flexible.However, it has poor conductivity and mechanical properties, and cannot be commercialized.So to improve the electrolyte's competitiveness, scientists want to increase the electrolyte by increasing the array of compounds.
Zhejiang industry university materials scientist tao xinyong and his team will produce magnesium borate Mg2B2O5 nanowires, due to the material with good mechanical properties and electrical conductivity, flame retardant is a kind of no pollution, low toxicity, can promote fire the stability of the carbon layer, so the team is to put magnesium borate nanowires in solid polymer electrolyte, the study of the material whether traits can be a distraction to battery performance.
The team will polymer electrolyte with respectively with 5%, 10%, 15% and 5% of the weight of magnesium borate nanowires mix, found the nanowires can strengthen the electrolyte electrical conductivity, and compared with no increase nanowires electrolyte, new electrolyte can bear more stress (stress), let more stable electrode surface.
The team pointed out that the acceleration of ion flow increased the conductivity of the battery, and the study also found that the electrolyte was not flammable.Team actually will be the new nanowires and lithium iron phosphate (LiFePO4) cathode and electrolyte of lithium anode after combination, compared with the old electrolyte, ratio efficiency (rate performance) and circulating capacity is higher, at 50 ° C temperature, 40 ° C and 30 ° C and 0.2 C discharge rate, the cycle capacity is 150, 106 and 50 mah g 1.
But the researchers also said that while the nanowires greatly improve the conductivity and fire resistance, they still can't operate at room temperature, and there is a long way to go before they can be commercialized.