Lithium Difluorophosphate

Synonyms：LiDFP; Phosphorodifluoridic acid, lithium salt

CAS No.：24389-25-1

EINECS No.：643-080-8

Molecular Formula：F₂HO₂P·Li

Molecular Weight：109.92

Structure Formula：
                                

Standard：

Properties：Lithium bis(fluorosulfony)imide is a white powder. It has the advantages of high stability (no decomposition below 200℃), excellent low temperature performance, good hydrolysis stability and more friendly environment.

Applications：Lithium Difluorophosphate (LiPO₂F₂) – a key electrolyte additive for lithium-ion batteries – fulfills its core function by forming a stable solid electrolyte interphase (SEI) film on the surfaces of positive and negative electrodes via its decomposition products. It is widely compatible with scenarios including power batteries, energy storage batteries, and consumer electronic batteries, and is particularly suited for products requiring enhanced high and low-temperature cycling performance and electrolyte decomposition inhibition, as well as performance optimization of ternary material batteries such as LiNi₀.₅Co₀.₂Mn₀.₃O₂ and LiNi₀.₅Co₀.₂₅Mn₀.₂₅O₂. The recommended addition level is 0.5%-3% of the total electrolyte mass, which can be flexibly adjusted based on specific formulations. Compared with traditional additives like lithium hexafluorophosphate (LiPF₆), Lithium Difluorophosphate boasts a higher thermal decomposition temperature: at ≥85℃, it inhibits cathode surface decomposition and electrolyte oxidation, avoiding the issue of harmful substances generated by the easy decomposition of traditional additives at high temperatures. The SEI film it forms is rich in LixPOyFz and LiF, featuring a dense structure, low impedance, and high stability, which addresses the defects of insufficient compactness and easy aging after long-term cycling in interface films formed by traditional additives. In terms of wide temperature range adaptability, it improves low-temperature discharge capacity at -20℃~0℃ and high-temperature cycling stability at 60℃~85℃, reduces capacity attenuation in extreme environments, and compensates for the shortcomings of traditional additives such as low low-temperature conduction efficiency and high susceptibility to side reactions at high temperatures. Additionally, it inhibits the decomposition of LiPF₆ in the electrolyte, reduces HF generation to extend electrolyte service life, and offers lower production, storage, and transportation costs. It also exhibits superior synergistic performance with additives like VC (vinylene carbonate) and ES (ethylene sulfate), avoiding the strict humidity requirements and risks of hydrolysis-induced electrode corrosion associated with traditional additives. These advantages translate directly into significant value: it increases battery cycle life by over 30%, achieves a capacity retention rate of ≥85% after 500 cycles at room temperature, reduces interface impedance by 20%-40%, and supports 1C-5C rate charge-discharge. Simultaneously, it suppresses electrolyte oxidation and electrode side reactions, mitigates the risks of battery swelling and thermal runaway, and enables reduced dosage of traditional lithium salts without compromising performance, optimizing formulation costs.

Storage：Keep in a well-closed container. Store in a cool, dry and well-ventilated warehouse. 

Packing：5kg HDEP bottle.