Which energy storage technology is described as solid-state with safety benefits?

• A. Lithium-ion
• B. Lithium Metal Polymer
• C. Flow
• D. Nickel Cadmium

Answer: (B)

Solid-state or polymer-based electrolytes offer safety advantages because they replace flammable liquid electrolytes with a solid or gel-like medium, reducing leakage and improving thermal stability. Lithium Metal Polymer fits this description because it uses a polymer electrolyte with a lithium metal anode, creating a solid or gel-like environment that is inherently safer than the liquid-electrolyte systems used in traditional lithium-ion cells. Flow batteries rely on liquid electrolytes stored externally, so they’re not solid-state. Nickel cadmium and lithium-ion cells typically use liquid or aqueous electrolytes, which carry higher flammability risks compared to solid or polymer electrolytes.