题型:阅读理解 题类:常考题 难易度:普通
四川省成都市2019-2020学年高二上学期期末调研英语试卷
Ever notice your phone dies faster in cold weather? But why? As LiveScience reports, it all comes down to chemical reactions within the battery.
If you were to open any smartphone, you'd probably find a Li-ion(锂离子)battery running the show. Inside the battery, there are two poles, a positive pole(正极)and a negative pole(负极), and how much charge your phone has all depends on which side the ions stay. A fully charged battery will be jam-packed with ions on the positive end, while a dead battery will have all the ions stored in the negative end.
Your phone is powered as the individual ions travel in solution(溶液)from one pole to the other, but a cold temperature doesn't cause the Solution flow in the battery itself. If it flowed, the ions would have to go somewhere, but they actually stay put when it gets cold. The cold temperature causes chemical reactions that slow down the current(电流). The only other time this smaller current is sent through the battery is when all the ions have been spent, so your phone mistakenly reads the slowdown as being out of power.
Now, how can you get yourself out of this situation? Dr. Stephen J. Harris, a chemist at the Lawrence Berkeley Lab, says whatever you do, don't charge it. Your fully charged battery isn't lacking ions, and the cold temperature isn't allowing more ions to be pulled into the anode. They pass through the solution as solid lithium, which can really do some serious damage to the battery cell itself.
The only way to get the battery back to life is to let it return to its normal operating temperature. We recommend leaving it in your pocket or spending a few minutes inside away from the bitter cold.
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