Lithium Battery Electrolyte
Physicochemical Properties of LiFSI
Appearance: White powder
Chemical Formula: LiN(SO₂F)₂
Molecular Weight: 187.072
Melting Point: 124–128°C
CAS No.: 171611-11-3
Product Description
Lithium bis (fluorosulfonyl) imide (LiFSI) is a new type of electrolyte lithium salt used in lithium battery electrolytes. It is environmentally friendly and has high safety performance. Compared with lithium hexafluorophosphate (LiPF6), which is currently the most widely used commercially, LiFSI has advantages in thermal stability (above 200 ℃) and conductivity, and has industrial production conditions. It is currently recognized as the best alternative to LiPF6 at home and abroad, with good development prospects.
At present, the application fields of lithium batteries mainly include: transportation power supply, electric energy storage power supply, mobile communication power supply, new energy storage power supply, aerospace military power supply, with a wide range of application fields. Its key materials include: positive electrode, negative electrode, adhesive, separator, and electrolyte. Its working principle is to combine these raw materials in physical form to achieve stable chemical properties. Among them, the electrolyte of lithium batteries is the carrier for ion transport in batteries, responsible for the transfer of charges between positive and negative electrodes. It is generally prepared from high-purity organic solvents (commonly carbonate solvents), electrolyte lithium salts, necessary additives and other raw materials in a certain proportion under certain conditions. It plays an important role in the safety of batteries (solvents are flammable substances), high and low temperature performance, cycle life, rate discharge ability, etc. With the increasing application of lithium batteries, lithium bis (fluorosulfonyl) imide (LiFSI), a new type of electrolyte solute with higher safety and stability, has officially ushered in development opportunities.
Main Technical Parameters
| Item | Specification | |
| Main Component | LiFSI Content, % | ≥ 99.9 |
| Impurities | Moisture (H₂O), % | ≤ 0.005 |
| Fluoride (as F⁻), % | ≤ 0.005 | |
| Chloride (as Cl⁻), % | ≤ 0.0002 | |
| Sulfate (as SO₄²⁻), % | ≤ 0.001 | |
| Na，% | ≤ 0.0005 | |
| K，% | ≤ 0.001 | |
| Fe，% | ≤ 0.0005 | |
| Ca，% | ≤ 0.0005 | |
| Cu，% | ≤ 0.0005 | |
| Mg，% | ≤ 0.0005 | |
| Ni，% | ≤ 0.0005 | |
| Cr，% | ≤ 0.0002 | |
| Zn，% | ≤ 0.0002 | |
| As，% | ≤ 0.0002 | |
| Cd，% | ≤ 0.0002 | |
| Pb，% | ≤ 0.0002 | |
| Note 1: LiFSI content is the margin obtained by subtracting the total measured values of impurities listed in the table from 100%; Note 2: Cation detection adopts ICP-OES method; Note 3: Anion detection adopts HPIC method. |
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Zhejiang Lihua New Material Science & Technology Co., Ltd. is located at No. 50 Nianhua Road, Green Industry Quzhou, Zhejiang Province. It is an emerging fluorine chemical enterprise that focuses on the research and development, production, and sales of fluorine-based fine chemical products, and is committed to innovation in high-end green and environmentally friendly fire extinguishing agents. The company relies on strong technical strength and industry resources, with green development as its core concept, and has become a rapidly rising industry star in the field of fluorine chemical industry.
