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raw · notes · ingested 2026-10-27

LiBr from recycled lithium-ion batteries — feasibility assessment (research note)

confidence: medium

Source: web search / literature survey, 2026-10-27

Question: Can end-of-life lithium-ion batteries be economically converted to lithium bromide for use as absorption-cooling solution?

Origin: Open question in r26D “Future of Cooling” deck (Sept 2023).

Chemistry

The conversion is straightforward. Battery recycling processes extract lithium as lithium carbonate (Li₂CO₃) or lithium hydroxide (LiOH). Either converts to lithium bromide in a single acid-base step:

  • Li₂CO₃ + 2HBr → 2LiBr + H₂O + CO₂
  • LiOH + HBr → LiBr + H₂O

Purity requirements for absorption-chiller LiBr solution are high (corrosion and crystallization sensitivity), but this is a refinement step, not a fundamental barrier.

Economics (as of 2026)

Not viable today. Three factors:

  1. Recycled lithium is expensive. A Swedish Energy Agency survey puts recycled lithium at roughly 3× the cost of virgin-source lithium. Newer electrochemical methods report up to 97% recovery efficiency but remain capital- and energy-intensive.
  2. Battery feedstock commands a premium. Li₂CO₃ and LiOH are more valuable returning to new batteries than converting to LiBr, a lower-value industrial chemical.
  3. No published process study exists. Zero papers evaluate LiBr production from recycled LIB material. The literature gap itself is telling — the pathway hasn’t attracted enough economic interest to study.

Reverse direction studied

A 2021 Membranes paper (Joo et al.) proposes bipolar membrane electrodialysis to recover lithium from spent lithium bromide as lithium hydroxide, with hydrobromic acid as a by-product. Optimized at 30 mA/cm² current density. This confirms the chemistry works in both directions but addresses a different waste stream (HVAC industry LiBr disposal, not battery recycling).

When viability could flip

  • Lithium oversupply from recycling: When recycled lithium exceeds battery-grade demand, lower-value outlets like LiBr become rational.
  • Battery chemistry shift: Sodium-ion and other post-lithium chemistries could create a glut of end-of-life lithium with no battery market to return to.
  • Micro-scale absorption demand: If 1–5 ton absorption chillers create significant new LiBr demand, a dedicated recycling-to-LiBr stream could pencil out.

Assessment

Chemically trivial, economically premature. The circular-economy story is real but needs a process-economics study and depends on market conditions that don’t exist yet. Worth monitoring as both battery recycling and micro-scale absorption mature.

Sources