Batteries
The Future of Battery Technology
The Battery Series
Part 5: The Future of Battery Technology
The Battery Series is a five-part infographic series that explores what investors need to know about modern battery technology, including raw material supply, demand, and future applications.
Presented by: Nevada Energy Metals, eCobalt Solutions Inc., and Great Lakes Graphite
The Future of Battery Technology
This is the last installment of the Battery Series. For a recap of what has been covered so far, see the evolution of battery technology, the energy problem in context, the reasons behind the surge in lithium-ion demand, and the critical materials needed to make lithium-ion batteries.
There’s no doubt that the lithium-ion battery has been an important catalyst for the green revolution, but there is still much work to be done for a full switch to renewable energy.
The battery technology of the future could:
- Make electric cars a no-brainer choice for any driver.
- Make grid-scale energy storage solutions cheap and efficient.
- Make a full switch to renewable energy more feasible.
Right now, scientists see many upcoming battery innovations that have the promise to do this. However, the road to commercialization is long, arduous, and filled with many unexpected obstacles.
The Near-Term: Improving the Li-Ion
For the foreseeable future, the improvement of battery technology relies on modifications being made to already-existing lithium-ion technology. In fact, experts estimate that lithium-ions will continue to increase capacity by 6-7% annually for a number of years.
Here’s what’s driving those advances:
Efficient Manufacturing
Tesla has already made significant advances in battery design and production through its Gigafactory:
- Better engineering and manufacturing processes.
- Wider and longer cell design allows more materials packaged into each cell.
- New battery cooling system allows to fit more cells into battery pack.
Better Cathodes
Most of the recent advances in lithium-ion energy density have come from manipulating the relative quantities of cobalt, aluminum, manganese, and nickel in the cathodes. By 2020, 75% of batteries are expected to contain cobalt in some capacity.
For scientists, its about finding the materials and crystal structures that can store the maximum amount of ions. The next generation of cathodes may be born from lithium-rich layered oxide materials (LLOs) or similar approaches, such as the nickel-rich variety.
Better Anodes
While most lithium-ion progress to date has come from cathode tinkering, the biggest advances might happen in the anode.
Current graphite anodes can only store one lithium atom for every six carbon atoms – but silicon anodes could store 4.4 lithium atoms for every one silicon atom. That’s a theoretical 10x increase in capacity!
However, the problem with this is well-documented. When silicon houses these lithium ions, it ends up bloating in size up to 400%. This volume change can cause irreversible damage to the anode, making the battery unusable.
To get around this, scientists are looking at a few different solutions.
1. Encasing silicon in a graphene “cage” to prevent cracking after expansion.
2. Using silicon nanowires, which can better handle the volume change.
3. Adding silicon in tiny amounts using existing manufacturing processes – Tesla is rumored to already be doing this.
Solid-State Lithium-Ion
Lastly, a final improvement that is being worked on for the lithium-ion battery is to use a solid-state setup, rather than having liquid electrolytes enabling the ion transfer. This design could increase energy density in the future, but it still has some problems to resolve first, such as ions moving too slowing through the solid electrolyte.
The Long-Term: Beyond the Lithium-ion
Here are some new innovations in the pipeline that could help enable the future of battery technology:
Lithium-Air
Anode: Lithium
Cathode: Porous carbon (Oxygen)
Promise: 10x greater energy density than Li-ion
Problems: Air is not pure enough and would need to be filtered. Lithium and oxygen form peroxide films that produce a barrier, ultimately killing storage capacity. Cycle life is only 50 cycles in lab tests.
Variations: Scientists also trying aluminum-air and sodium-air batteries as well.
Lithium-Sulphur
Anode: Lithium
Cathode: Sulphur, Carbon
Promise: Lighter, cheaper, and more powerful than li-ion
Problems: Volume expansion of up to 80%, causing mechanical stress. Unwanted reactions with electrolytes. Poor conductivity and poor stability at higher temperatures.
Variations: Many different variations exist, including using graphite/graphene, and silicon in the chemistry.
Vanadium Flow Batteries
Catholyte: Vanadium
Anolyte: Vanadium
Promise: Using vanadium ions in different oxidation states to store chemical potential energy at scale. Can be expanded simply by using larger electrolyte tanks.
Problems: Poor energy-to-volume ratio. Very heavy; must be used in stationary applications.
Variations: Scientists are experimenting with other flow battery chemistries as well, such as zinc-bromine.
Battery Series: Conclusion
While the future of battery technology is very exciting, for the near and medium terms, scientists are mainly focused on improving the already-commercialized lithium-ion.
What does the battery market look like 15 to 20 years from now? It’s ultimately hard to say. However, it’s likely that some of these new technologies above will help in leading the charge to a 100% renewable future.
Thanks for taking a look at The Battery Series.
Energy
Visualized: Inside a Lithium-Ion Battery
Lithium-ion batteries are critical for many modern technologies, from smartphones to smart cities. Here’s how this critical technology works.
What’s Inside a Lithium-Ion Battery?
Winning the Nobel Prize for Chemistry in 2019, the lithium-ion battery has become ubiquitous and today powers nearly everything, from smartphones to electric vehicles.
In this graphic, we partnered with EnergyX to find out how these important pieces of technology work.
Looking Inside
Lithium-ion batteries have different standards in various regions, namely NMC/NMCA in Europe and North America and LFP in China. The former has a higher energy density, while the latter has a lower cost.
Here is the average mineral composition of a lithium-ion battery, after taking account those two main cathode types:
Material | % of Construction | ||||||
---|---|---|---|---|---|---|---|
Nickel (Ni) | 4% | ||||||
Manganese (Mn) | 5% | ||||||
Lithium (Li) | 7% | ||||||
Cobalt (Co) | 7% | ||||||
Copper (Cu) | 10% | ||||||
Aluminum (Al) | 15% | ||||||
Graphite (C) | 16% | ||||||
Other Materials | 36% |
The percentage of lithium found in a battery is expressed as the percentage of lithium carbonate equivalent (LCE) the battery contains. On average, that is equal to 1g of lithium metal for every 5.17g of LCE.
How Do They Work?
Lithium-ion batteries work by collecting current and feeding it into the battery during charging. Normally, a graphite anode attracts lithium ions and holds them as a charge. But interestingly, recent research shows that battery energy density can nearly double when replacing graphite with a thin layer of pure lithium.
When discharging, the cathode attracts the stored lithium ions and funnels them to another current collector. The circuit can react as both the anode and cathode are prevented from touching and are suspended in a medium that allows the ions to flow easily.
Powering Tomorrow
Despite making up only 7% of a battery’s weight on average, lithium is so critical for manufacturing lithium-ion batteries that the U.S. Geological Survey has classified it as one of 35 minerals vital to the U.S. economy.
This means refining lithium more effectively is critical to meeting the demand for next-generation lithium-ion batteries.
EnergyX is powering the clean energy transition with the next generation of lithium metal batteries with longer cycle life, greater energy density, and faster charging times.
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