why lithium-ion batteries still explode, and what\'s being done to fix the problem

by:CTECHi     2020-01-17
The United States has a new Samsung Galaxy Note7 phone. S.
Wednesday, September 21, the store after the lithium explosionion (Li-ion)
The battery forced the company to recall about a million units. Lithium-
Ion batteries have been making this kind of news for years
They caused a fire in the electrical system of hoverboards, laptops, other mobile phones and even Boeing 787 Dreamliner.
So why, 25 years after the battery went public, lithium-
Are these problems still prone to ion batteries?
When will Engineers finally find a solution?
The first is the reality check: Despite these high
If you look at the numbers, Lee-ion-
Power supply equipment is relatively safe. K. M.
Abraham, one of Li\'s pioneers
A professor at ion batteries and Northeastern University said, \"there are more than one billion mobile phones and computers used every day in the world,\" compared with the small number of accidents.
\"The chances of a fire on your phone are very, very low,\" Abraham said . \". \"Lithium-
The failure rate of ion batteries is less than one in a million.
\"By contrast, the National Oceanic and Atmospheric Administration says that the likelihood of you being hit by lightning in a lifetime is about 1 out of 13,000.
Of course, even a fire or explosion is too much.
Here\'s what you need to know about Li-
Ion batteries occasionally catch fire and what improvements will be made to mobile phone battery technology.
Normally this is a manufacturing defect and obviously this is the case with Note7 phones.
But the potential problem is
The ion battery contains a lot of energy in a compact package-
That\'s why, of course, they\'re all used from mobile phones to Tesla electric cars. A Li-
The energy density of ion batteries is as high as about 160 watts per kilogram (Wh/kg)
About twice as much as a new alkaline or NiCad rechargeable battery.
To produce this force, it depends on three main components: a cathode with positive electricity made of metal oxides, an anode with negative electricity made of graphite, and a liquid electrolyte-
Solvent containing lithium salt-
This makes the charge flow between the poles.
Like the two troublemakers in the grammar school classroom, the cathode and anode need to be physically separated. Lithium-
The ion battery is achieved by a permeable polyethylene separator, which can be as small as 10 microns in thickness.
As the battery improves and engineers try to package more power into a smaller package, the thin plastic separator is taxed to the limit.
\"The separator is really thinning,\" said Isidor Buchmann, founder and CEO of Cadex, a manufacturer of battery equipment and also runs the educational website Battery University.
\"When this happens, the battery becomes more delicate.
When the separator is broken, it causes a short circuit, thus initiating a process called heat out of control.
According to Abraham, this is one of the main ways the fire started.
The chemicals inside the battery began to heat up, resulting in further degradation of the separator.
The battery can eventually reach a temperature of more than 1,000 degrees Fahrenheit.
At this point, when exposed to oxygen in the air, flammable electrolyte can ignite or even explode.
These catastrophic failures, although may be rare, will not mean Li-ion battery?
It\'s unlikely, says Buchmann.
While safety is a problem, this is just one of several factors in battery design.
Most of the others are related to energy density, battery life and charging performance.
\"It\'s very difficult to produce something better than lithium --
Said Buckman.
But it may not be necessary, because Li
The ion battery itself is getting better and better.
\"There is a lot of effort to use better materials and improve safety even if the battery is defective,\" Abraham said . \".
The next generation of Li-
The ion battery will have more features
In the case of starting heat out of control, a solid polymer separator with a higher melting point.
This is not the only progress we can expect in the next few years.
\"When the new electrolyte is in contact with the air, they don\'t catch fire,\" he added . \". While Li-
Ion represents the latest level of battery design and will continue to do so in the near future, with a huge market waiting to launch a model that can surpass Li-
In terms of safety and performance.
The most promising competitor is xxx. called solid-state battery.
In these batteries, the liquid electrolyte in question will be replaced by a solid electrolyte that is far from flammable.
The result could be a super
Stable batteries with better energy density are much less likely to ignite or explode. A Michigan-
The company based in Sakti3 has been working to achieve the following goals
In 2015, vacuum cleaner giant Dyson bought the National battery for $90 million.
Despite the high valuation, it seems to represent a Cup with only half of it.
Firm Company-
National Technology shows hope, but if the company is ready to introduce
The next generation of smartphones may be replaced by ion, and electronic giants such as Apple or Samsung are quoted 10 times as much as the next generation of smartphones.
At least that\'s what George Crabtree looks like.
He is the director of the Joint Center for Energy Strategy Research managed by the Department of Energy.
\"Everyone will agree if you can use a solid battery --
\"The national electrolyte, you will do it,\" Crabtree said . \".
\"It is safer, not flammable and not degraded.
\"Despite its potential, the inherent problem of solids --
The National Battery is a lithium ion that moves much slower in solids than the liquid electrolyte currently used.
Therefore, the charging speed of the solid
The National battery is often a glacier.
A change in solids
National theme, lithium-
Sulfur batteries have been sold on the market for high
Highly drone, light weight, ideal for applications.
But this battery has its own shortcomings.
Very limited use cycle-
Currently about 20-
Means more progress is needed before lithium.
Sulfur batteries can power mobile phones, laptops and other consumer electronics.
More battery technology is still being developed, and each technology has its own commitment and problems.
For example, lithium-
The energy density of the air battery may be 10 times that of Li-ion batteries—but lithium-
Air batteries need to use oxygen from the air in the cathode, but must prevent moisture, carbon dioxide and other impurities. Magnesium-
Ion batteries can pack more powerful batteries at a lower cost than today\'s mobile phone batteries, and may be more stable.
But Li-none of the cathode or anode currently in use
The ion battery will work and it may take ten years to transform these components.
However, there is no substitute for Li
In the next year or two, ion batteries will appear in mobile phones, an area packed with competitors, and experts believe we are not far from safer, more powerful battery-powered devices.
\"I think this is an important moment for storage.
In the next five to 10 years, we will see tremendous changes in storage technology . \"
\"The reason is that so many people want it.
All rights reserved©2005-
US 2016 Consumer AllianceS. , Inc.
May not be reproduced in whole or in part without written permission.
Consumer Reports have nothing to do with any advertisers on this website.
Custom message
Chat Online 编辑模式下无法使用
Leave Your Message inputting...