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EC number: 456-990-3 | CAS number: 244761-29-3 LITHIUM-BIS(OXALATO)BORATE
Endpoint summary
Administrative data
Description of key information
Additional information
Physical appearance and colour
Lithium bis(oxalato)borate is a white, solid and odourless powder.
Melting Point/Boiling Point
No melting point and boiling point could be determined for lithium bis(oxalato)borate between 25 and 400 °C by differential scanning calorimetry. Decomposition was determined at 290 to 295 °C. Decomposition already above 158 °C might also occur.
Density
The relative density of lithium bis(oxalato)borate is about 1.0 g/cm3.
Granulometry
The particle size and distribution of the particles were analysed as follows:
D10: >= 28.20 - <= 28.89 µm (distribution: >= 3.94 - <= 4.25%)
D50: >= 114.83 - <= 115.12 µm (distribution: >= 15.15 - <= 15.47%)
D90: >= 262.45 - <= 274.38 µm (distribution: >= 43.44 - <= 43.61%)
Vapour pressure
The vapour pressure of lithium bis(oxalato)borate was determined to be 0.0042 Pa at 20°C. Thus, lithium bis(oxalato)borate can be regarded as hardly volatile or non-volantile.
Partition coefficient
The partition coefficient (n-octanol / water) was estimated from the quotient of the n-octanol solubility and the water solubility: It is equal or lower than 0.000016, the log Pow is equal or lower than minus 4.8. Due to hydrolysis an experimental determination is not possible.
Water solubility
The solubility of lithium bis(oxalato)borate in water at 20.0 +/- 0.4 °C and pH 1.3 was determined to be equal or higher than 507 g/L and lower than 1015 g/L. Hydrolysis of the substance was determined visually. Thus, no precise data on the solubility in water could be determined but a range (507 - 1015 g/L).
Surface tension
Lithium bis(oxalato)borate as such does not exist in water but hydrolyses. The resulting ions (lithium cation, bis(oxalato)borate anion, and the postulated degradation products: lithium hydrogen oxalate, the complex C2HBO5, oxalic acid, and boric acid) are quite small and do not comprise surface active components unifying hydrophilic and lipophilic properties. Moreover, lithium bis(oxalato)borate is a conduct agent and surface activity is not a desired property of the material. Thus, the performance of a study on surface tension at 1 g/L (OECD guideline 115) is scientifically not reasonable.
Flash point
The determination of the flash-point according to EU Method A.9 is not applicable as this method refers only to liquid substances but lithium bis(oxalato)borate is a solid (powder).
Autoflammability
The study on autoflammability does not need to be conducted as lithium bis(oxalato)borate is a solid that hydrolyses in contact with air moisture. No melting point could be determined up to 400 °C as the substance starts to decompose at 158 °C (main decomposition occurs between 290 and 295 °C).
Flammability
Lithium bis(oxalato)borate was found to be not
- "highly flammable" according to the criteria of EU method A.10 (solids),
- "flammable in contact with water" and therefore not "hazardous" according to the criteria of EU method A.12 (Flammability (contact with water)),
- "pyrophoric" according to the criteria of EU method A.13 (solids and liquids).
Based on these results of all three studies, lithium bis(oxalato)borate is not to be classified as flammable. Lithium bis(oxalato)borate is not explosive as organo-lithium compounds are unlikely to have explosive properties and the calculated oxygen balance is less than -200. Moreover, when tested for dust explosiveness according to VDI 2263 (Dust fires and dust explosions; hazards, assessment, protective measures) lithium bis(oxalato)borate did not ignite and did not reveal dust explosiveness under test conditions. Based on these results of experimental tests and theoretical evaluations, lithium bis(oxalato)borate is not to be classified explosive according to Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP).
Oxidising properties
In general, oxidising properties are not expected for an organic molecule that does not contain oxygen, chlorine or fluorine. Or if the molecule does contain oxygen, chlorine or fluorine, but these elements are only chemically bonded to carbon or hydrogen. Based on the structure of the lithium bis(oxalato)borate and according to Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP), it was not classified as oxidising.
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