Don't throw the battery you have used, you can also give the children next door a lesson | Play seriously

Today, when I want to change the battery, I want to change the battery

Suddenly I can't tell which one is used and which is new

How to distinguish between the old and the old?

Play some serious use today!

experiment equipment

The bid cups, batteries with different power, brackets that fall vertical,

experiment procedure

To knock on the blackboard, pay attention to safety, don't hurt yourself ~

First, prepare two alkaline batteries (non -charging)

One new section, one section has been used for a while

Then, two batteries fall from the same height

Observe the height of the bounce after its landing

You can see that the bouncing height of the two batteries is different

Guess a guess

Which of the new batteries and old batteries are high?

Let's reveal the answer

Black is a new battery full of electricity

Red is a battery that has been used for a period of time

Battery with low battery bounces is relatively high

And scientists have done further experiments

Fall the batteries of different electricity battles together

You can see the lower the battery power

The higher the height of the bounce

When the power is below 50%, the bounce will reach the highest value.

Picture source Doi: 10.1039/c5TA01576F

Original understanding

The non -rechargeable batteries we use now are usually alkaline batteries, which have the advantages of large battery capacity and long discharge time. Taking alkaline zinc manganese batteries as an example, its anode is zinc (Zn), cathode is manganese dioxide (MNO2), and the electrolyte is sodium hydroxide (NAOH) or potassium hydroxide (KOH).

The anode of the zinc -manganese battery is a gel -like substance containing zinc powder. It absorbs the impact performance better when falling, so it is not easy to play.

When the alkaline battery is discharged, the anode is oxidized to ZNO, as shown in the formula (1) and (2)

Formula (1) shows that the battery will generate Zn (OH) 42- in the solution until the electrolyte is too saturated, and it will start to precipitate to ZNO.

Zinc anode becomes a more dense solid, and it is not easy to deform, so it will be easier to play when it falls. (It can be analogized to become born eggs and cooked eggs. When the same force is applied, cooked eggs turn faster)

So the height of the bounce depends on the oxidation level of the zinc anode.

The following figure shows that the anode scanning electronic microscope imaging is enlarged ten times before and after discharge.

Picture source Doi: 10.1039/c5TA01576F

(Left) Before discharge, (right) after discharge

references

[1] Bhadra S, Hertzberg B J , Hsieh A G , et al. The Relationship betweenCoefficient of Restitution and State of Charge of Zinc Alkaline Primary LR6Batteries[J]. Journal of Materials Chemistry A, 2015, 3(18).

[2] Thankqianjin4 for some Usefuldiscussion

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01. The experiments of Karaka (ಠ ω ಠ) are shared as follows:

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