What's the difference between lithium-ion battery electrolyte and distilled water? With the rapid expansion of the markets for laptops, mobile phones, and electric vehicles, there's a growing demand for high-performance rechargeable batteries. To improve the performance of lithium-ion batteries, electrolytes containing various additives have been developed. So, what's the difference between lithium-ion battery electrolyte and distilled water?
Lithium-ion battery electrolyte composition
The electrolyte in a lithium-ion battery is the carrier of ions. It is generally composed of lithium salts and organic solvents. The electrolyte acts as a conductor of ions between the positive and negative electrodes of a lithium-ion battery, ensuring its advantages such as high voltage and high specific energy. Currently, the most commonly used electrolytes in lithium-ion batteries on the market include lithium perchlorate, lithium fluoride salts, and lithium hexafluorophosphate.
1. Ethylene carbonate: Molecular formula: C3H4O3, a clear and colorless liquid (35℃), a crystalline solid at room temperature, and a good solvent for polyacrylonitrile and polyvinyl chloride.
2. Propylene carbonate, colorless and odorless, or pale yellow transparent liquid, soluble in water and carbon tetrachloride, miscible with ether, acetone, benzene, etc. This product should be stored in a cool, ventilated, and dry place, away from fire sources, and transported and stored according to the regulations for general low-toxicity chemicals.
3. Diethyl carbonate, colorless liquid with a slight odor; vapor pressure 1.33 kPa/23.8℃; flash point 25℃ (flammable liquid that can evaporate into vapor and enter the air).
4. Dimethyl carbonate is a non-toxic, environmentally friendly, and widely used chemical raw material; it also has a high evaporation temperature and a fast evaporation rate.
5. Ethyl methyl carbonate, a colorless and transparent liquid, is a high-tech, high-value-added chemical product that has emerged in recent years. It is an excellent solvent for lithium-ion battery electrolytes. This product should be stored in a cool, ventilated, and dry place and transported and stored in accordance with the regulations for flammable chemicals.
6. Lithium hexafluorophosphate, white crystals or powder, highly hygroscopic; when exposed to air or heated, lithium hexafluorophosphate rapidly decomposes due to the action of water vapor in the air, releasing PF5 and generating white fumes.
7. Phosphorus pentafluoride is a phosphorus halide compound. At room temperature and pressure, phosphorus pentafluoride is a colorless, foul-smelling gas that is highly irritating to the skin, eyes, and mucous membranes. It is used as a catalyst in polymerization reactions.
The difference between lithium-ion battery electrolyte and distilled water
I. Different material composition
The electrolytes in the human body are mainly composed of water, sodium chloride, and pH buffers. Aluminum electrolyte capacitors contain important solvents such as GBL, while supercapacitor electrolytes contain important solvents such as propylene carbonate or acetonitrile. Lithium-ion battery electrolytes contain important solvents such as ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate.
Distilled water is water that has been distilled and condensed. Water that has been distilled twice is called double-distilled water, and water that has been distilled three times is called triple-distilled water. Low-oxygen-consumption water is obtained by adding potassium permanganate and acid. Industrial distilled water is obtained using the distillation method. Electrolyte and distilled water are two different liquids; electrolyte is an acidic substance, while distilled water is pure water.
II. Different Uses
There are electrolytes used in living organisms (also called electrolyte solutions), as well as electrolytes used in the battery industry, and electrolytes used in electrolytic capacitors, supercapacitors, and other industries. The composition of electrolytes used in different industries varies greatly, and can even be completely different. Electrolytes are the medium used in chemical batteries, electrolytic capacitors, etc., and have a certain degree of corrosiveness, supplying ions for their normal operation.
In everyday life, distilled water is primarily used in applications involving machinery and electrical appliances because it is non-conductive, ensuring stable operation and extending the lifespan of these appliances. In the pharmaceutical industry, distilled water is used for its hypotonic properties. Rinsing surgical wounds with distilled water causes any remaining tumor cells to absorb water, swell, break down, die, and lose their activity, thus preventing tumor implantation and growth in the wound.
Electrolyte is a crucial component of lithium-ion batteries. The composition of electrolytes used in different industries varies greatly, sometimes even completely. Electrolyte serves as the medium in chemical batteries, electrolytic capacitors, and other similar devices, supplying ions for their normal operation and ensuring the reversibility of chemical reactions during operation.
