At present, one of the difficulties encountered by electric vehicles is the test of temperature, which will lead to a large amount of power loss in a low temperature environment. The actual symptoms are slow charging speed and reduced range. Colleagues may have an impact on braking and other systems. Ford and other automobile manufacturers have tested thermal management systems designed to solve these shortcomings, and now a scientific research team has proposed creative solutions.
The solution proposed by scientists mainly uses the derived cobalt compound (zif-67) material, which is heated to a high temperature to create 12 sided carbon nanospheres. These tiny structures have rugged surfaces and excellent charge transfer ability, so they are quickly used as anode materials for coin shaped batteries with lithium metal cathode.
These experiments show that the battery is stable during charging and discharging in the temperature range from 77 ° f (25 ° C) to -4 ° f (-20 ° C). At a temperature slightly below the freezing point, the battery maintains 85.9% of the storage capacity. These tests were carried out in conjunction with other lithium-ion battery designs, which were found to have little electricity at freezing temperatures. Even if the temperature is reduced to -31 ° f (-35 ° C), batteries with bumpy anodes can still be charged and release almost all the charges when discharged.
Scientists say these results show that this design can extend the functions of lithium-ion batteries to extreme environments, which may not only apply to electric vehicles, but also to everything from UAVs to spacecraft and between.
This study was published in acs central science.》
From american chemical society