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A semi-solid-state battery is a battery whose electrolyte combines solid, gel-like, and/or liquid components. It sits between conventional lithium-ion batteries with liquid electrolytes and all-solid-state batteries that use solid electrolytes. The term describes a family of designs—not one standardized construction or a guarantee of particular safety, cost, or performance.
What does “semi-solid-state battery” mean?
In practical terms, a semi-solid-state battery has an electrolyte system that is partly solidified, gelled, or hybridized. It is not entirely liquid, but it is not fully liquid-free either. The exact arrangement and proportion of liquid vary by design; there is no universal liquid percentage that defines the category.
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For example, POSCO describes a gel-type electrolyte intermediate between liquid and solid, while LG Energy Solution describes a hybrid of polymer, oxide, and liquid electrolyte materials. Battery manufacturer BPI also describes a system combining solid and liquid electrolyte components. These descriptions illustrate the range covered by the label rather than a single standard architecture.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall“Quasi-solid-state” is sometimes used in overlapping industry contexts, but the sources do not establish it as a standardized synonym. A specific cell’s technical documentation is needed to know what its terminology means.
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- Semi-Solid-State Battery for Safer Travel Power: Semi-solid-state battery design helps deliver safer, more stable charging in hot, cold, and everyday travel conditions. This portable charger power bank is built for road trips, flights, camping, commuting, and daily carry when reliable backup power matters.
- 10,000mAh Power Bank, Slim Enough for Every Day: Get 10,000mAh power in an ultra-slim 0.57-inch body that weighs only 6.9 oz. This small portable charger slips easily into a pocket, purse, backpack, or carry-on, giving you dependable power without the bulky brick feel.
- 15W Wireless + 30W USB-C Fast Charging: Snap on for up to 15W magnetic wireless charging, or plug in for up to 30W USB-C fast charging when you need power fast. A flexible magnetic portable charger and power bank for iPhone 16, 15, 14, 13, and 12 series.
- Built for Flights, Hotels, Road Trips, and Long Days Out: TSA-friendly capacity makes this battery pack charger portable for air travel, vacations, theme parks, work trips, and power outages. Pass-through charging lets you charge your phone and power bank together overnight with one USB-C cable.
- Smart Display, Low-Current Mode & TORRASCare Support: The digital display shows remaining battery at a glance before you head out. Low-current mode supports earbuds, AirPods, and other small devices, while 18-month TORRASCare support gives you added confidence for daily use and travel.
How is it different from liquid and all-solid-state batteries?
| Battery category | Electrolyte description | Key distinction |
|---|---|---|
| Conventional liquid-electrolyte lithium-ion | Liquid electrolyte | The electrolyte is liquid. |
| Semi-solid-state | A hybrid, gelled, or partly solidified system that retains liquid and/or gel components | It combines characteristics of liquid and solid electrolyte approaches; the formulation varies. |
| All-solid-state | Solid electrolyte | It replaces liquid electrolyte with solid electrolyte. POSCO notes that the solid electrolyte can also function as a separator. |
The practical distinction is that “semi-solid-state” does not mean “all-solid-state.” It refers to an intermediate family of designs, not simply another name for batteries with fully solid electrolytes.
Why are manufacturers developing semi-solid-state designs?
The stated engineering goal is to combine elements of liquid and solid electrolyte systems. In a 2024 interview, Dong-gyu Kim, who led LG Energy Solution’s Semi-Solid-State Battery Team, described hybrid technologies as a way to move beyond the limits of relying on a single technology. That is a company representative’s explanation of the design rationale, not independent proof of a performance advantage.
LG Energy Solution and POSCO have also described semi-solid approaches as potentially requiring less change to conventional battery manufacturing processes than some alternatives. These are company descriptions; they do not establish that every semi-solid design is easier or cheaper to manufacture.
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Are semi-solid-state batteries used in electric cars?
Yes. In a report published on 4 February 2025, TrendForce said semi-solid-state batteries had been deployed in EVs in China. The report named the IM L6, NIO ET7, Seres 5, DongFeng Aeolus E70, and Voyah Passion. It reported no mass-produced semi-solid-state EV models outside China at that time; that dated finding should not be read as a statement about worldwide availability today.
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- SEMI-SOLID-STATE SAFETY, BUILT FOR TRAVEL: Semi-solid-state cells hold a fraction of the flammable liquid in ordinary lithium-ion and resist thermal failure. In internal testing, the cells were puncture, cut and drill tested with no fire. The aluminum housing is highly thermally conductive, helping draw heat away from the cells and dissipate it during charging. Under 100Wh, it's airline carry-on ready.
- ALL-DAY POWER, STILL POCKETABLE: A full 10,000mAh gives a typical iPhone roughly 1.5 to 2 charges - plenty for long travel days, events and back-to-back workdays without chasing an outlet. The dense semi-solid state design (a paired 5,000mAh + 5,000mAh layout) keeps the pack slim enough to slip into a jacket pocket or bag. The built-in lanyard doubles as a USB-C cable, so a charging cord is always attached - nothing extra to pack or lose.
- QI2-CERTIFIED 15W MAGNETIC CHARGING: A strong, precisely aligned magnet snaps onto iPhone 17, 16, 15, 14, 13 and 12 with precise alignment and a strong hold, so you can keep using your phone while it charges. As a Qi2-certified, MagSafe-compatible charger, the magnetic connection keeps the charger aligned while you scroll, text, or move.
- DUAL USB-C, UP TO 30W OUTPUT: Two USB-C ports let you charge several devices at once and deliver up to 30W of fast wired power for phones, earbuds and tablets. The same port also refills the 10K itself quickly, so it's ready for the next day. (Large tablets and laptops draw more and may only charge partially.)
- FULL-COLOR LCD DISPLAY: A crisp color screen shows exact battery percentage plus live input and output wattage, so you always know how much power is left and how fast each device is charging - no blinking LEDs to decode. It stays easy to read at a glance, whether you're commuting, at an event, on a shoot or working late.
TrendForce estimated that global use in EVs remained below 2 GWh in 2024, with market penetration below 0.5%. It forecast penetration above 1% by 2027. That figure was a forecast made in 2025, not a verified result. The report also named Ganfeng Lithium, Farasis Energy, and WeLion New Energy as companies developing the technology and described production at GWh scale.
Applications such as electric vehicles and wearables have also been discussed by LG Energy Solution, but intended uses do not establish that products using the technology are broadly available to consumers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does “semi-solid-state” guarantee better safety or performance?
No. The label alone does not establish that a battery is safer, offers more range, costs less, or lasts longer than a conventional lithium-ion battery. Those outcomes depend on the particular cell design, chemistry, manufacturing quality, and test conditions.
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Rank #3
- WORLD'S THINNEST SEMI-SOLID-STATE 5,000MAH: At just 6.8mm at its thinnest point, the Air is the slimmest semi-solid-state Qi2 power bank you can buy — the semi-solid-state design supports this slim form factor while helping the cells stay stable and reducing fire risk. It sits flush against your iPhone and slips into a pocket, slim bag or clutch. TechRadar Pro CES 2026 Picks Award Winner.
- SEMI-SOLID-STATE SAFETY, BUILT FOR TRAVEL: Unlike conventional lithium-ion banks with a flammable liquid electrolyte, SolidSafe Air's semi-solid-state cells sharply cut the liquid component — lowering risk at the cell level and staying stable under heat, stress and impact. It's not a circuit-only fix but a fundamental change in chemistry. At 18.5Wh, it's airline carry-on ready.
- 15W QI2 MAGNETIC + 20W USB-C: Qi2-certified, MagSafe-compatible magnetic charging snaps onto iPhone 17, 16, 15, 14, 13 and 12 with precise, secure alignment, while the USB-C port delivers up to 20W when you're in a hurry. The 5,000mAh cell gives a modern iPhone roughly one full top-up, and you can charge wired and wireless at the same time.
- TITANIUM SHELL, BUILT TO LAST: A titanium-reinforced shell resists dents and drops, and titanium's high thermal conductivity helps draw heat away from the cells and dissipate it at the surface during charging. It's premium protection that keeps the Air tough and travel-ready in a remarkably slim form.
- CCC CERTIFIED FOR TRAVEL: CCC certified for battery compliance and travel in China, with FCC, CE and UKCA listings for other regions. Built-in circuit safeguards cover overcharge, over-discharge, overcurrent and short circuits. Magnetic charging suits MagSafe iPhones or a thin compatible case; for Pixel and other Android phones, use a magnetic case or the 20W USB-C port.
When assessing a specific battery or manufacturer claim, look for:
- The cell chemistry and electrolyte architecture, including how much liquid remains.
- The test method and conditions behind any safety claim.
- Measured energy density, rather than a general promise of greater range.
- Cost, charge/discharge efficiency, and cycle-life data, with test conditions stated.
- Evidence of manufacturing readiness for the particular product, rather than a general description of the technology.
What is the commercial outlook?
Commercial plans and forecasts need dates attached. In March 2024, LG Energy Solution stated a plan to commercialize a semi-solid-state battery in 2026 or 2027. That was the company’s plan at the time; the available evidence does not verify whether the timeline was met or changed.
Likewise, TrendForce’s 2027 market-penetration figure was a forecast published in 2025. It should not be treated as a confirmed outcome. The category includes different electrolyte formulations and development stages, so a company’s target or one model’s deployment cannot establish the status of every semi-solid-state battery.
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