Three battery technologies that could power the future!!!
Three battery technologies that could power the future!!
The world needs more power, preferably in a form that’s clean and renewable. Our energy-storage strategies are currently shaped by lithium-ion batteries – at the cutting edge of such technology – but what can we look forward to in years to come?
Let’s begin with some battery basics. A battery is a pack of one
or more cells, each of which has a positive electrode (the cathode), a negative
electrode (the anode), a separator and an electrolyte. Using different
chemicals and materials for these affects the properties of the battery – how
much energy it can store and output, how much power it can provide or the
number of times it can be discharged and recharged (also called cycling
capacity).
Battery companies are constantly experimenting to find chemistries
that are cheaper, denser, lighter and more powerful. We spoke to Saft Research
Director Patrick Bernard, who explained three new battery technologies with
transformative potential.
In 2020, the new Tesla Roadster is set to become the first electric car that offers 1,000 km (620 miles) on a single charge.
WHAT
IS IT?
The way that sodium-ion (Na-ion) batteries work is similar to lithium-ion (Li-ion) batteries; as the name suggests, the main difference is the replacement of lithium by sodium. A variety of sodium-based materials can be used as the battery’s positive electrode, which is decisive when it comes to performance - longer life or cycling capacity for example.
The way that sodium-ion (Na-ion) batteries work is similar to lithium-ion (Li-ion) batteries; as the name suggests, the main difference is the replacement of lithium by sodium. A variety of sodium-based materials can be used as the battery’s positive electrode, which is decisive when it comes to performance - longer life or cycling capacity for example.
WHAT
ARE ITS ADVANTAGES?
Na-ion batteries offer numerous advantages. The main one is that they are
cheaper than Li-ion batteries (by up to 30 percent per cell). However, this
technology will not be able to compete with Li-ion in terms of energy density –
neither by weight nor volume – and could only be used for stationary
applications where this is not a major requirement. These might include storing
excess electricity generated by renewable energy sources such as solar or wind
power.
WHEN
CAN WE EXPECT IT?
Many of the cell components and manufacturing processes are the same as for
current Li-ion batteries. The main development is focused on electrode
materials. Na-ion batteries might be ready to enter production in three to four
years’ time.
A two-seat electric plane made by Slovenian firm Pipistrel stands outside a hangar at Oslo Airport, Norway.
WHAT
IS IT?
In Li-ion batteries, the active materials are layered between the lithium ions
in stable host structures during charge and discharge. In lithium-sulfur (Li-S)
batteries, there are no host structures. While discharging, the lithium anode
is consumed and sulfur transformed into a variety of chemical compounds; during
charging, the reverse process takes place.
WHAT
ARE ITS ADVANTAGES?
A Li-S battery uses very light active materials: sulfur in the positive
electrode and metallic lithium as the negative electrode. This is why its
theoretical energy density is extraordinarily high: four times greater than
that of Li-ion. That makes it a good fit for the aviation and space industries.
WHEN
CAN WE EXPECT IT?
Li-S technology needs further research and development work to improve its life
expectancy and to continue to increase specific energy density. It is not
expected to be ready for applications requiring long battery life for at least
five years.
WHAT
IS IT?
Solid-state batteries represent a paradigm shift in terms of technology. In
modern Li-ion batteries, ions move from one electrode to another across the
liquid electrolyte (also called ionic conductivity). In all-solid-state
batteries, the liquid electrolyte is replaced by a solid compound which
nevertheless allows lithium ions to migrate within it. This concept is far from
new, but over the past 10 years – thanks to intensive worldwide research – new
families of solid electrolytes have been discovered with very high ionic
conductivity, similar to the liquid electrolyte, allowing this particular the technological barrier to be overcome.
WHAT
ARE ITS ADVANTAGES?
The first huge advantage is a marked improvement in safety at cell
and battery levels: inorganic solid electrolytes are non-flammable when heated,
unlike their liquid counterparts. Second, it permits the use of innovative,
high-voltage high-capacity materials, enabling denser, lighter batteries with
improved safety performance and better shelf-life as a result of reduced
self-discharge. As the batteries can exhibit a high power-to-weight ratio, they
may be ideal for use in electric vehicles.
WHEN
CAN WE EXPECT IT?
Several kinds of all-solid-state batteries are likely to come to market as technological progress continues. The first could be solid-state batteries with graphite-based anodes, bringing improved energy performance and safety. In time, lighter solid-state battery technologies using a metallic lithium anode should become commercially available.
Resources: https://www.saftbatteries.com/media-resources
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