Overview
Cobalt hydroxide is a transitional metal hydroxide primarily used as an intermediate in the production of cobalt-based materials. It serves as a critical precursor for lithium-ion battery cathodes, particularly in the synthesis of lithium cobalt oxide (LiCoO2). The compound is commercially available in powder form, with color varying from pink to reddish-brown depending on hydration and particle size. The global demand for cobalt hydroxide has surged due to the rapid growth of the electric vehicle (EV) industry, where it accounts for over 60% of cobalt consumption. China dominates both production and refining, with most industrial-grade material sourced from the Democratic Republic of Congo (DRC) via ethical supply chains.
Physical and Chemical Properties
Cobalt hydroxide exhibits a hexagonal crystal structure in its beta form (β-Co(OH)2), which is the most stable phase at room temperature. The alpha phase (α-Co(OH)2) shows turbostratic disorder and higher electrochemical activity. The compound decomposes upon heating, releasing water vapor and forming cobalt oxide (CoO) around 168°C. Chemically, it reacts with acids to form corresponding cobalt salts and dissolves in ammonia solutions due to complex ion formation. Oxidation in air gradually converts it to cobalt oxyhydroxide (CoOOH), particularly in alkaline environments. These redox properties make it electrochemically active, a crucial characteristic for battery applications.
Main Applications
The primary use of cobalt hydroxide lies in battery technology, where it's calcined to produce lithium cobalt oxide for Li-ion batteries. Battery-grade material requires ultra-high purity (≥99.5%) with controlled particle size distribution (D50 typically 5-15μm). Additional applications include: 1) Catalyst production for petroleum refining and Fischer-Tropsch synthesis, 2) Preparation of cobalt blue pigments for ceramics and glass, 3) Desiccant in paints and varnishes, and 4) Raw material for other cobalt compounds like cobalt carbonate and acetate. Emerging uses involve supercapacitors and water oxidation catalysts.
Safety and Storage
As a cobalt compound, hydroxide form poses moderate health risks. Inhalation of dust may cause respiratory irritation and long-term exposure could lead to "cobalt lung." Proper PPE including N95 masks and chemical goggles is mandatory during handling. Storage requires dry, well-ventilated areas separated from strong acids and oxidizing agents. Bulk quantities should be packed in moisture-proof bags (usually 25kg polyethylene-lined woven sacks) with clear hazard labeling. Spills should be contained with inert absorbents and disposed as hazardous waste according to local regulations.
B2B Procurement Guide
Industrial buyers should prioritize: 1) Purity specifications (battery-grade vs industrial-grade), 2) Trace metal analysis (Ni, Fe, Cu limits <100ppm), 3) BET surface area (affects reactivity), and 4) Supplier's ethical sourcing documentation (DRC conflict-free certifications). Major production hubs include China's Zhejiang and Guangdong provinces, with spot prices closely tracking LME cobalt metal prices. Contract purchasing (6-12 months) often provides better stability than spot buys. Quality verification through ICP-OES analysis and XRD pattern matching is recommended, especially for battery applications.
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