Name: How Do Lithium-Ion Batteries Work?
Uploaded: 2021-01-06T18:40:59.000Z
Duration: 8 min 12 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

in almost every  portable electronic device.

They're in smartphones, laptops, and even in our cars.

In fact, batteries are  one of the keys to realizing

In 2018, there were over  five million electric cars  on the road,

and fully battery powered  electric cars.

And their popularity  only continues to grow.

Since batteries are powering  more and more of our lives,

why don't we explore  how exactly batteries work,

and what makes  lithium-ion batteries  so special?

Now, there are a bunch of  batteries out there,

made of different materials,  in different shapes,

batteries are composed  of electrochemical cells.

And the materials that make up  an electrochemical cell

can create the positive  and negative sides

you see on the either end  of that battery.

that make the battery ends  positive or negative.

and the positive side  is called the cathode.

The next part  is called the electrolyte,

which sits between  the anode and the cathode.

And this is important,  because it's what enables

charged ions to flow  between the two electrodes.

or any material that helps the chemical reaction flow smoothly.

And finally, there's  a semipermeable layer

Now, if we wanted to power,  say, a flashlight,

that connects the anode  to the light bulb

will travel through  our circuit as electricity,

will help the ions  they left behind at the anode

also commonly referred to as a redox reaction.

Oxidation is where  a material loses electrons,

and reduction is  when it accept electrons.

Now, when we talk about battery performance,

we have to consider both energy and power density.

And a good example to highlight the difference

you see that the jug  has a greater overall  energy storage.

It can simply hold  more water or energy.

well, then it's clear  that the water  or that stored energy

comes out of the mug  at a much faster rate,

demonstrating that the mug has  a higher power output.

as how much energy is  within a given mass.

So if something has a high energy density,

Power density,  on the other hand,  is defined as,

you guessed it, how much power  is within a given mass.

So when something has a high power density,

So if you have a device  with high energy density

it means that the device  can store a lot of energy

A good example of this  is your very own phone.

Now, you may notice your phone  doesn't really generate  that much power.

to have all of your apps open while streaming

but then you'd probably have to recharge it pretty soon afterwards.

both the anode and the cathode are made of materials

that can enhance their ability to absorb lithium ions.

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How Do Lithium-Ion Batteries Work?

process

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realize