Mercedes-Benz is taking a major step forward in electric vehicle production by testing a semi-solid-state battery in its EQS sedan. Developed in collaboration with Factorial Energy and Mercedes-AMG High-Performance Powertrains, this new battery technology promises to improve range, provide faster charging speeds, and give drivers a safer drive. If successful, Mercedes-Benz could place itself ahead of competitors in the race toward next-generation EVs.
Breaking Range Barriers with Advanced Batteries
The EQS prototype fitted with a semi-solid-state battery has demonstrated an estimated 620-mile driving range, which is a massive leap from the 390-mile range of the current EQS 450+. This 25%+ increase comes from Factorial Energy’s proprietary FEST cells, which combine the advantages of both solid-state and liquid electrolyte technologies.
Unlike conventional lithium-ion batteries, which use a liquid electrolyte, solid-state batteries rely on a solid electrolyte that allows for lighter, more energy-dense cells. The benefits are clear:
- Increased Energy Density: More miles per charge
- Faster Charging Speeds: Less downtime at charging stations
- Improved Safety: Lower risk of fire due to the absence of flammable liquid electrolytes
How Semi-Solid-State Batteries Work
While fully solid-state batteries are still in development, Mercedes-Benz is taking an intermediate step with quasi-solid electrolytes. These combine a solid matrix infused with a liquid-like electrolyte, allowing for:
- Higher energy efficiency than traditional lithium-ion batteries
- Reduced dendrite formation, which helps prevent battery degradation
- Easier manufacturing, making large-scale production more feasible
To further enhance performance, the EQS prototype battery uses a floating cell carrier design equipped with pneumatic actuators that adjust the pressure on the cells as they expand and contract during charging and discharging. This innovation helps maintain battery integrity and reduces wear over time.
Mercedes Leads the Charge Toward Solid-State Innovation
Mercedes has been working with Factorial Energy since 2021 and took an equity stake in the Massachusetts-based battery firm in 2022. While the current semi-solid-state battery is undergoing testing, Mercedes is already planning its next step: a fully solid-state battery called Solstice.
The Solstice battery is expected to deliver an 80% increase in range compared to today’s lithium-ion packs. It is also expected to have lower production costs due to an innovative dry-coating process and offer faster charging capabilities for an easier EV experience
While other automakers, including Toyota, have been exploring solid-state battery technology for over a decade, Mercedes-Benz may be the first to bring a version of this innovation to mass production.
The Future of EV Batteries is Taking Shape
With real-world testing now underway, Mercedes-Benz is positioning itself as a leader in next-gen battery technology. If the EQS prototype’s semi-solid-state battery proves successful, it could signal a major shift in the future of electric mobility, giving consumers longer range, faster charging, and enhanced safety.
For now, the race continues, but one thing is clear: Mercedes-Benz is determined to be at the forefront of EV battery evolution.
This post may contain affiliate links. Meaning a commission is given should you decide to make a purchase through these links, at no cost to you. All products shown are researched and tested to give an accurate review for you.