CATL: All-solid-state battery production timeline for 2027

Pandaily China

Overview

CATL aims for small-batch production of all-solid-state batteries by 2027, though current technology remains at TRL-4 (laboratory principle verification). Sulfide solid electrolytes, being moisture-sensitive and potentially generating hydrogen sulfide, necessitate ultra-dry production lines, making existing wet-process liquid electrolyte tools largely unusable. Unresolved process risks include solid-solid electrode interfaces, hot isostatic pressing yield, and dry electrode coating challenges.

In Depth

Key Findings

CATL, the world’s largest battery manufacturer, has set a target to commence small-batch production of all-solid-state batteries by 2027. However, the company’s current solid-state battery technology is assessed at Technology Readiness Level 4 (TRL-4), indicating that it is still at the laboratory principle verification stage, with numerous technical challenges remaining before commercialization.

Technical Details

One of the primary technical hurdles CATL faces is related to the properties of sulfide solid electrolytes. While these electrolytes offer excellent ionic conductivity, they are highly sensitive to moisture and can produce toxic hydrogen sulfide gas upon contact with water. This characteristic means that most existing wet-process liquid electrolyte tools used in conventional lithium-ion battery manufacturing cannot be reused. Instead, dedicated production lines capable of maintaining ultra-dry environments are essential, leading to increased capital investment and manufacturing complexity.

Furthermore, several unresolved process risks have been identified:

• Solid-solid electrode interface challenges: It remains difficult to establish technologies that reduce interfacial resistance between electrodes and solid electrolytes and maintain stable contact over long periods.
• Hot Isostatic Pressing (HIP) yield: The yield of the HIP process, which is critical for uniformly forming solid electrolyte and electrode materials, is currently low, potentially leading to higher costs.
• Dry electrode coating challenges: Dry coating technology, which uniformly applies electrode materials without liquids, offers environmental benefits but presents significant technical difficulties in achieving consistency and performance.

Background & Context

All-solid-state batteries are considered the ultimate form of next-generation batteries due to their advantages in safety, high energy density, and long lifespan. The focus of major companies like CATL on this sector could shape the future of the EV market. However, the announced TRL level and specific challenges highlight that commercializing solid-state batteries remains technically complex and requires substantial R&D investment.

Strategic Significance & Outlook

For CATL to achieve its 2027 small-batch production target, it must rapidly resolve the material science and manufacturing process challenges outlined above. Key areas of focus will be moisture management, interface optimization, and improving production yields. Overcoming these hurdles will enable CATL to establish leadership in the solid-state battery market and contribute to the further advancement of the electric vehicle industry.

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