Semi-Solid state Battery Guide
Semi-solid-state batteries bridge the gap between traditional lithium-ion technology and next-generation solid-state systems. By combining higher energy density with improved safety and thermal stability, they are increasingly used in long-endurance UAVs, electric vehicles, and industrial energy systems.
What are semi-solid-state batteries?
Solid-state batteries represent a significant advancement in battery technology, offering various improvements over traditional lithium-ion batteries. Unlike conventional batteries that use a liquid or gel electrolyte, solid-state batteries use a solid electrolyte.
This can be made from a variety of materials, including ceramics, glass, or polymers. Compared to normal Li-Po batteries, semi solid-state batteries have higher energy density (up to 342wh/kg), have a lighter weight, and smaller volume and dimension.
Due to the manufacturing process and the materials that are used, semi-solid state batteries have longer endurance life and are available in much higher capacities which can be as big as 312ah.
One interesting specification of semi solid-state batteries is their higher voltage per cell which means when fully charged, it can reach up to 4.45V per cell. With the possibility of working on low temperature, even on -40℃, semi solid-state batteries are more stable and provide a better performance.
Why Semi-Solid-State Batteries Exist?
Conventional lithium-ion batteries face trade-offs between energy density, safety, and lifespan. Semi-solid-state designs address these limitations by:
Increasing usable energy density
Reducing dendrite formation
Improving thermal stability under high load
For UAVs requiring long endurance, semi-solid-state batteries designed for drones offer a safer and higher-energy-density alternative compared to conventional lithium-ion packs.
Semi-Solid vs Lithium-Ion vs Solid-State
| Feature / Specification | Semi Solid-State Batteries | Li-Po / Li-ion Batteries |
|---|---|---|
| Energy Density | Up to 342 Wh/kg (Higher) | 150–250 Wh/kg |
| Weight & Volume | Lighter and more compact | Heavier for same capacity |
| Voltage per Cell | Up to 4.45V fully charged | 4.2V fully charged |
| Safety & Flammability | Less flammable, lower risk of thermal runaway | More prone to overheating and fire |
| Operating Temperature | Works even at -40℃ | Limited performance in very low temperatures |
| Endurance / Lifespan | Longer cycle life due to reduced dendrite formation | Shorter lifespan with higher degradation |
| Discharge Rate | Moderate (lower than Li-Po, can be compensated by capacity) | High discharge rate for performance applications |
| Production Cost | Higher due to complex manufacturing | Lower and widely mass-produced |
| Best Applications | EVs, Drones, Industrial & Energy Storage | Consumer electronics, hobby drones, RC models |
Where Semi-Solid-State Batteries Make Sense?
Long-endurance UAVs and VTOL platforms
High-voltage EV battery packs
Industrial energy storage requiring safety margins
They are particularly effective in applications where flight time, safety, and cycle life matter more than peak discharge rate.
Voltage Configurations and System Design
Common configurations such as 4S, 6S, 12S, and 18S are used depending on platform size and power requirements. Semi-solid-state cells allow higher voltage per cell, enabling more compact high-voltage packs.
Ready to Choose a Semi-Solid-State Battery?
Explore available semi-solid-state battery configurations optimized for UAVs, EVs, and industrial systems.
