January 17, 2025: Microvast has announced what it said is a significant milestone in development of its ‘liquid electrolyte-free true all-solid-state’ battery (ASSB) tech.

Unlike conventional lithium ion or semi solid-state (SSS) batteries, ASSB utilizes a bipolar stacking architecture that enables internal series connections within a single battery cell, the company said on January 9.

Traditional lithium and SSS batteries, constrained by the limitations of liquid electrolytes, typically operate at nominal voltages of 3.2V to 3.7V per cell. In contrast, Microvast said its tech completely eliminates liquid electrolytes.

According to Microvast, the breakthrough allows a single cell to achieve dozens of volts or higher based on specific application needs. 

This is a key step forward in improving safety, energy density, and efficiency for critical applications such as data center backup power systems and electric school buses, while also paving the way for future innovations in robotics and other high-demand sectors such as electric vehicles.

In addition, the bipolar design reduces the number of interconnections between cells, modules, and packs. This simplifies the overall system architecture and enhances both energy efficiency and operational safety.

Microvast has also developed an all-solid electrolyte separator membrane based on an advanced polyaramid separator, which is non-porous and tailored specifically for solid-state applications. 

Yang Wu, CEO of Microvast, said: “By developing a technology that eliminates liquid electrolytes and prioritizes scalability, we are well-positioned to meet the evolving needs of industries requiring reliable and safe energy storage solutions.”