Introduction of the lithium ion battery with a new record of low operating temperature

Although the battery may be used in relatively cold climate, they have a lot of limitations. When the temperature reach to 20 ℃, the most battery performance can achieve the best level of only 50%, and when the temperature was minus 40 ℃,Lithium ion batteries performance can only be reached to about 12% of its capacity at room temperature. For low temperature environment (for example, the temperature may drop to - 157 ℃ in outer space, or the temperature lower than parts of Canada and Russia - 50 ℃) of the battery, battery will be greatly affected.

But our research team has discovered a new technology, even in the case of other battery may fail, we are using new technology to design the battery can still work normally. "It is well known that the electrolyte (medium carry ion chemistry between electrodes) and electrode (positively charged cathode and anode of negatively charged) have great influence on the performance of the battery," the Chinese department of Fudan University in Shanghai researchers said Dr Yong - YaoXia battery pack.

When the temperature reduce a lot, the lithium ion battery frequently used conventional electrolyte based on ester material will become slow conductor, and occur at the interface between electrolyte and electrode electrochemical reaction is difficult to continue, this means that the lithium ion battery can't in extreme cold climates hold its good battery performance. This problem has been plagued by the researchers.

The team tried using electrolyte based on ester (ethyl acetate), the electrolyte has a lower freezing point, even at extremely low temperatures can also be recharged. For electrodes, they use two kinds of organic compounds, poly (PTPAn) cathode and three anilines 1,4,5,8 - naphthalene tetracarboxylic acid dianhydride (NTCDA) derived from polyimide (PNTCDA) anode. Unlike electrode used in lithium ion batteries, these organic compound electrode is not dependent on the embedded response (embedded refers to the molecular matrix of the ion continuously injected into the process of molecular matrix and slow down as the temperature decreases).

Yong - YaoXia said: "to benefit from ethyl acetate electrolytes and organic polymer electrode, designed by our research team to rechargeable lithium ion battery can work normally under - 70 ℃ ultra-low temperature.

Yong - YaoXia and his team believe that, with other attempt at extreme temperatures of lithium ion batteries solutions than it might be a more elegant solution. Other researchers trying to develop battery additives to external heating or use liquefied gas battery electrolyte to solve this problem, but these solutions require additional materials, which will be an additional weight.

Yong - YaoXia think of also has many advantages of the battery. "And the traditional lithium-ion batteries, compared to transition metal electrode material is contained in the organic material resources are abundant, cheap, environmentally friendly," he said. He estimates that they design of the battery, the price of the electrode materials about a third of the prices for other lithium ion battery electrodes.

But, before the formal production, the battery is still need to do some optimization. Xia thinks, compared with the commercial lithium ion battery, the battery than energy (unit) with the energy of a quality is still low, assembly process need to be further optimized." Despite low specific energy, in professional in the field of application, it shows great application potential.

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