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Two More Major All-Solid-State Battery Production Lines Completed by a China Company

Sina Technology 2025-09-17 09:46:18

Recently, two major giants announced the completion of their all-solid-state battery production lines.

(1) South Korea's SK On

On September 16, SK On officially launched its solid-state battery pilot plant located within the Future Technology Institute in Yuseong District, Daejeon Metropolitan City. This production line will primarily be used for trial production of samples to supply customers, and systematically conduct product quality and performance verification. This marks a key step in SK On's journey to becoming a sustainably high-quality development company. The company will make every effort to advance the commercial implementation of the world's first solid-state batteries, accelerating the arrival of the electrification era.

Since the strategic partnership with Solid Power was established in 2022, both parties have continuously deepened joint research and development of all-solid-state batteries. The new factory covers an area of approximately 4,628 square meters. SK On will focus on developing sulfide-based all-solid-state batteries on the pilot production line, with some lines also dedicated to the research and development of solid-state lithium metal batteries.

SK On plans to commercialize solid-state batteries by 2029, a year ahead of the original target of 2030. The company's current primary goal is to develop solid-state batteries with an energy density of 800Wh/L, and it plans to further increase this to 1000Wh/L in the future.

It is worth mentioning that this factory is the first in South Korea to apply SK On's independently developed "Warm Isostatic Pressing (WIP)" technology. This technology can apply uniform pressure to the electrodes in an environment of 25~100℃, effectively improving electrode density and battery performance.

Although WIP technology can significantly suppress battery heating and extend cycle life, traditional processes are difficult to integrate into continuous production lines, limiting manufacturing efficiency. SK On has overcome mass production bottlenecks by pioneering unique battery designs and manufacturing processes, combined with conventional pressing methods, thereby retaining the advantages of WIP. Specifically, the company optimizes the ratio of active materials and conductive agents to reduce internal electrode resistance, thus suppressing battery heating. At the same time, it improves the interfacial bonding between the electrode and the solid-state electrolyte, reducing interfacial resistance and enhancing charge-discharge stability and cycle life.

In addition, SK On is actively expanding its cooperation in industry, academia, and research. Last May, the company collaborated with Hanyang University to develop lithium metal anode protective film technology, successfully tripling the lifespan of sulfide-based all-solid-state batteries, and the related technology has been patented globally.

SK On President Lee Seok-hee (fifth from left), SK On Chief Technology Officer Lee Chang-won (fourth from left), SK On Future Technology Institute Director Park Ki-soo (sixth from left), Solid Power Korea Vice President Andreas Meyer (second from left), and others.

(2) Innovation Navigation

China Innovation Aviation has completed the production line construction for its latest all-solid-state battery with an energy density of 430Wh/kg. A steady progression route from semi-solid-state to all-solid-state is planned, and the supporting production line is set to be officially operational this year.

Currently, the company has launched the "TopFlow High-Energy Super Flying Battery," a semi-solid-state battery with an energy density of 350Wh/kg. This battery utilizes a solid-liquid hybrid electrolyte, features temperature resistance up to 200°C, and supports continuous discharge above 10C. Leveraging its proprietary "TopFlow" tab structure, the battery reduces impedance by 50%, effectively controlling temperature rise during high-power discharge. The product is scheduled for official application in 8-ton-class eVTOL aircraft in 2026.

To meet longer-term market demands, CALB has simultaneously developed a "Boundless" all-solid-state battery with higher energy density, utilizing a high specific energy material system to achieve an ultra-high energy density of 430 Wh/kg, significantly surpassing the current mainstream industry level of 300-400 Wh/kg. At the same time, this technology has made key breakthroughs in single cell capacity (50Ah), low-pressure operation (below 1MPa), cycle life, and power performance (based on a high ionic conductivity solid-state electrolyte exceeding 10 mS/cm). It is planned to be applied in vehicles by 2027.

Innova Aerospace emphasizes that the company is one of the earliest domestic enterprises to introduce 400Wh/kg-level hybrid solid-liquid battery technology and is about to become one of the first in the world to achieve mass production of batteries at this level.

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Two More Major All-Solid-State Battery Production Lines Completed by a China Company

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