Semi-solid batteries — perhaps the ultimate route for electric vehicles

Factors driving the proliferation of lithium-ion batteries

Since Sony commercialised lithium-ion batteries in 1990, they have gained substantial market share. Compared with other energy storage devices, lithium-ion batteries have the advantages of high energy density and long cycle life.

Developing direction of lithium-ion batteries — solid-state lithium-ion batteries

To thoroughly address the safety issues, the use of highly flammable organic liquid electrolytes should be avoided entirely; all-solid-state batteries (ASSBs) become a good choice because organic liquid electrolytes are replaced by inorganic solid electrolytes that have high thermal stability.

  • Inorganic solid electrolytes have much better electrochemical stability than organic liquid electrolytes and polymer electrolytes, and are compatible with higher potential cathode materials to increase energy density.
  • ASSBs have excellent mechanical properties. [3]
  • Even if the technical problems are solved, the cost of production needs to be reduced before production of large volumes could start. The price of raw materials for solid-state lithium-ion batteries is currently five times more than that of raw materials for traditional lithium-ion batteries. Besides, production of solid-state lithium-ion batteries requires high purity of raw materials, which translates into significant investment in equipment. [5]

The semi-solid-state lithium-ion battery — the compromise

A semi-solid-state lithium-ion battery is a battery where one electrode contains liquid electrolytes while the other electrode contains no liquid electrolytes. From the view of percentage of weight, liquid electrolytes account for 20% of a traditional lithium-ion battery’s weight, but 10% of a semi-solid-state lithium-ion battery’s weight. [6]

--

--

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Acuity Knowledge Partners

Acuity Knowledge Partners

57 Followers

We write about financial industry trends, the impact of regulatory changes and opinions on industry inflection points. https://www.acuitykp.com/