Lithium Carbonate

Context: Battery-grade lithium carbonate prices dropped 10.3% month-on-month to average around RMB 140,000 per tonne, driving down high-capacity Lithium Iron Phosphate (LFP) energy storage cell costs.

About Lithium Carbonate:

What It Is?

• Lithium Carbonate (Li₂CO₃) is an inorganic chemical compound and an essential precursor in the lithium-ion battery supply chain. It is an odourless, white crystalline salt and a primary refined lithium product used to manufacture cathode materials, particularly Lithium Iron Phosphate (LFP) and Lithium Cobalt Oxide (LCO). It is also widely used in specialized glass and ceramics.

Natural Resources & Geological Sources:

• Continental Brines (Salar Deposits): Extracted from lithium-rich subterranean brine aquifers in high-altitude salt flats, predominantly across South America’s Lithium Triangle — Chile, Argentina and Bolivia — as well as parts of China and the US.
• Hard-Rock Pegmatite Ores: Extracted from lithium-bearing minerals such as Spodumene, Lepidolite and Petalite, with major deposits found across Australia, China, Canada and Africa.
• Sedimentary/Clay Formations: Occurs in jadarite and hectorite clay deposits, such as the Thacker Pass deposit in the US.

How It Works: Production and Battery Mechanism

1. Extraction and Concentration: Lithium is pumped from underground brine pools into solar evaporation ponds or extracted by crushing and acid-leaching hard-rock spodumene ore, producing concentrated lithium chloride/sulphate solutions.
2. Precipitation Reaction: The concentrated lithium solution is treated with sodium carbonate (soda ash, Na₂CO₃) at elevated temperatures, causing sparingly soluble lithium carbonate (Li₂CO₃) to precipitate.

1. Cathode Active Material Synthesis: Refined battery-grade Li₂CO₃ is blended and calcined at high temperatures with iron, phosphate or cobalt compounds to produce cathode powders such as LiFePO₄.
2. Electrochemical Intercalation: Inside a charged battery, lithium ions (Li⁺) leave the cathode lattice, travel through the electrolyte and intercalate into the graphite anode. During discharge, the process reverses, releasing electrical energy.

Key Features of Lithium Carbonate:

• Battery-Grade Purity Standard: Requires a minimum chemical purity of ≥99.5%, with strict limits on magnetic contaminants, calcium and sodium to prevent battery degradation and thermal runaway.
• Retrograde Aqueous Solubility: Unlike most salts, its solubility in water decreases as temperature increases, a property used to precipitate and crystallize it from hot solutions.
• Cost-Effective LFP Pathway: Serves as the preferred and economical lithium input for Lithium Iron Phosphate (LFP) battery chemistries, widely used in commercial energy-storage systems and standard-range electric vehicles.
• Lower Decomposition Temperature: Decomposes at lower calcination temperatures compared with lithium hydroxide, making it well suited for the solid-state synthesis of cathode crystals.

Applications:

• Battery Energy Storage Systems (BESS) & EVs: A foundational raw material for manufacturing LFP and LCO cathodes used in grid-scale renewable-energy storage batteries, commercial solar-plus-storage projects and electric vehicles.
• Specialized Glass and Ceramics: Lowers the thermal expansion coefficient and melting point in cookware, ceramic stovetops, thermal-shock-resistant glass and telescope mirrors.
• Pharmaceuticals & Mental Health: Used under strict clinical prescription as a mood stabilizer for the treatment of bipolar disorder and major depressive episodes.
• Metallurgical & Aluminium Smelting Flux: Used as an additive in aluminium reduction cells to lower bath operating temperatures, improve electrical conductivity and reduce fluorine emissions.