Semi-Solid-State Batteries

A 2023 review in National Science Review describes hybrid cells that use both a solid electrolyte and a liquid electrolyte. The authors say people often call these cells semi-solid, quasi-solid, or pseudo-solid-state. They also say the public sometimes calls the same cells solid-state, and that this wording can mislead. [1]

The review says these hybrid cells share major materials and production steps with today's lithium-ion cells. It says that makes them easier to scale than an all-solid cell. It gives a NIO 150 kWh pack as an example of a semi-solid-state battery a company has launched. The review does not publish a lab report for every car that uses the words. [1]

NIO's ET7 page is the maker's page for that sedan. A catalog sentence that says semi-solid-state is a text match. It is not a chemical test of that car's cells, and it is not an EPA range figure. Where a maker and a paper use the name differently, both wordings are reported here and neither is treated as a lab result. [2] [1]