KDFOB (Potassium Difluoro(oxalato)borate, KODFB, >99.9%) Powder as Electrolyte Additive for Potassium-Ion Battery, 10-25 g/bottle, CPIBEAKDFOB

Potassium difluoro(oxalato)borate (commonly designated as KDFOB) is an advanced functional salt and interphase-directing additive engineered specifically for rechargeable potassium-ion (K-ion) and potassium-metal batteries. By pairing a potassium cation with the chelated, boron-based difluoro(oxalato)borate (DFOB-) anion, KDFOB bridges the gap between conventional simple halide salts and complex organic film-formers, offering robust interphase protection and enhanced electrochemical stability.

Its functional roles in electrolyte engineering are: (1) Dual-Layer Interphase (SEI/CEI) Passivation: KDFOB preferentially decomposes during early electrochemical formation cycles. Its ring-opening and reduction pathways yield a hybrid organic-inorganic Solid Electrolyte Interphase (SEI) and Cathode Electrolyte Interphase (CEI) rich in resilient boron, fluorine (KF), and oxalate decomposition species that stabilize reactive surfaces. (2) Aluminum Current Collector Protection: Similar to its lithium and sodium analogues, the DFOB- anion assists in passivating aluminum current collectors at elevated voltages, mitigating localized pitting corrosion and expanding the practical operating window of K-ion systems. (3) Suppression of Continuous Parasitic Reactions: By forming a dense, compact passivation film on graphite, hard carbon, or potassium metal anodes, KDFOB effectively halts ongoing electrolyte consumption, thereby boosting initial Coulombic efficiency and long-term capacity retention.

Part Number	CPIBEAKDFOB (C-PIB-EA-KDFOB)
CAS	2102517-30-4
Chemical Formula	C2BF2NaO4
Appearance	White Powder
Purity	>99.9% (Battery Grade)
Molecular Weight	159.82 g/mol
Package Size	10 g and 25 g/bottle

Notes: Please store the KDFOB powder in the glovebox due to its sensitivity to humidity and oxygen.