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Writer's pictureRich Washburn

Solid State Batteries: The Future of Energy Storage is Here


Solid State Batteries

Imagine a world where electric vehicles (EVs) charge in minutes, laptops need charging only once a week, and batteries are safer and more efficient than ever before. This isn't a distant dream anymore; solid state batteries (SSBs) are poised to revolutionize the energy storage landscape. Two pioneering companies, QuantumScape and Solid Power, are leading the charge towards making SSBs a commercial reality. Additionally, the Yoshino Power Station provides tangible proof that SSBs are available for consumer use today.


Solid state batteries have long been heralded as the next big thing in energy storage. Compared to traditional lithium-ion (LI) batteries, SSBs are more energy-dense, longer-lasting, safer, and smaller. The potential to charge faster makes them particularly appealing for EVs, where quick recharging can address one of the major hurdles in widespread adoption. Despite their advantages, SSBs have struggled to break into the market due to manufacturing challenges and high production costs. However, QuantumScape, Solid Power, and Yoshino are making significant strides in overcoming these barriers.


QuantumScape: A Breakthrough in Battery Design


California-based QuantumScape is on the verge of commercializing its QSE-5 solid state battery. One of the company's groundbreaking innovations is the anode-free battery. Traditional batteries have a silicon or graphite anode that stores lithium atoms. QuantumScape's design eliminates this component, allowing the lithium metal itself to act as the anode. This reduces the distance ions need to travel, enabling faster charging times. The QSE-5 can charge to full in less than 15 minutes, a game-changer for EVs.


Another key feature of QuantumScape’s battery is its unique housing, known as the FlexFrame. This design accommodates the expansion and contraction of the battery during charging, making it ideal for stacking in EV battery packs. Additionally, QuantumScape's battery boasts a lifespan of over 2,000 cycles, on par with the best lithium-ion batteries on the market today.


Solid Power: Advancing Battery Chemistry


Solid Power, based in Colorado, is taking a different approach with its solid sulfide electrolyte separator. This material offers excellent ionic conductivity, allowing for faster charging times. Unlike the brittle glass or ceramic separators used in some SSBs, sulfides are flexible and heat-resistant, making them more durable and easier to manufacture.


Solid Power’s batteries can be produced using existing roll-to-roll manufacturing equipment, significantly reducing production costs. The company claims its batteries can be manufactured for 15-35% less than its competitors. This cost efficiency, combined with the performance benefits of sulfide separators, positions Solid Power as a strong contender in the SSB market.


The Yoshino Power Station: Solid State for the Consumer


The Yoshino Power Station exemplifies the breakthrough of SSBs into consumer electronics. Available for purchase on Amazon, the Yoshino B330 solid state portable power station offers 330W of continuous power and 241Wh of storage. It features a solid state cell with a Nickel Cobalt Manganese (NCM) formula, using an inorganic-polymer composite (IPC) as the electrolyte. This construction enhances safety, energy density, and cycle life compared to traditional lithium-ion batteries.


The B330 is compact and portable, weighing in at 9.9 lbs. It can be charged via DC input, solar panels, or USB-C power delivery, and includes various output options such as AC outlets, USB-A, and USB-C ports. Additionally, the power station can be controlled remotely via an app, providing real-time information on power draw, remaining charge time, and charging status.


To understand the potential impact of these batteries, let's compare them with Tesla’s 4680 cylindrical cells, currently used in the Model Y and Cybertruck. The QSE-5 outperforms Tesla's cells in volumetric density, holding more energy per liter. Solid Power's batteries also show superior density, promising longer ranges for EVs. Yoshino’s B4000 model, with its 107Wh/kg energy density, outshines many competitors in terms of efficiency and portability.


In terms of cycle life, both QuantumScape and Solid Power’s batteries are competitive, with the QSE-5 leaning towards the upper end of the spectrum. Charge times for SSBs are significantly faster, with both companies' batteries capable of recharging in 15 minutes with minimal degradation.


However, the Yoshino B330, while offering solid state safety and longevity, is priced higher per watt-hour (Wh) than its competitors. This price difference reflects the advanced technology and first-generation status of the product. In terms of energy density, the B330 lags behind with 53.56Wh/kg compared to the 73-76Wh/kg of its rivals.


While neither QuantumScape nor Solid Power has set definitive mass-market release dates, their progress is promising. QuantumScape is preparing to scale up production with its Cobra system by 2025, while Solid Power is targeting 2028 for regular EV integration. Both companies are laying the groundwork for a future where SSBs are commonplace.


However, engineering challenges remain. QuantumScape’s oxide separators require high-temperature sintering, an energy-intensive process. Solid Power’s sulfide separators, though easier to produce, still face issues with dendrite formation. Continued research and development are essential to address these obstacles.


The advent of solid state batteries marks a pivotal moment in energy storage technology. While still in the early stages of commercialization, the advancements made by QuantumScape, Solid Power, and Yoshino suggest a bright future. As production scales up and costs come down, SSBs are set to transform industries ranging from automotive to consumer electronics.







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