LiPF6 EC DEC electrolyte has the properties of 25

Absolutely not, the production of electrolytes for lithium-ion batteries must be strictly dry. Moisture in the air causes the LIPF6 in the electrolyte to decompose and produce HF, PF3 and LIF, all of which are detrimental to the performance of the battery, so nitrogen is used to protect the production process.

Definitely not. This is mainly because the electrolyte reacts with air. The electrolyte is no longer an electrolyte. Is the battery still a battery? The reduction of electrolyte has a direct impact on the performance of the battery.

No, because it is easy to absorb moisture and there is no pressure, lithium hexafluorophosphate is easy to decompose.

The electrolyte of lithium batteries is an important part of the battery and has a great impact on the performance of the battery. In conventional batteries, the electrolyte is an electrolyte system with water as the solvent. However, since the theoretical decomposition voltage of water is only about 2 V (e.g., lead-acid batteries), even if the overpotential of hydrogen or oxygen is taken into account, the maximum voltage of a battery using water as a solvent is only about 2 V.

The voltage of lithium batteries is as high as 3 4V, and the traditional aqueous solution system is obviously no longer suitable for the needs of the battery, and the non-aqueous electrolyte system must be used as the electrolyte of the lithium-ion battery. Lithium battery electrolytes mainly use organic solvents and electrolytes that can withstand high voltages without decomposition. The electrolyte used in lithium-ion batteries is an ionic conductor with lithium salts of the electrolyte dissolved in an organic solvent.

Generally, as an organic electrolyte for practical lithium-ion batteries, it should have the following properties: (1) high ionic conductivity, which should generally reach 10-3 2*10-3s cm; The lithium-ion mobility number should be close to 1; (2) Wide range of electrochemically stable potentials; There must be an electrochemical stabilization window of 0 5 V; (3) Good thermal stability and wide operating temperature range; (4) The chemical properties are stable, and there is no chemical reaction with the current collector and tranquil substances in the battery; (5) Safe and low toxicity, preferably biodegradable. Suitable solvents need to have high dielectric constant and low viscosity, and commonly used alkyl carbonates such as PC and EC have strong polarity and high dielectric constant, but the viscosity is large, the intermolecular force is large, and lithium moves slowly in it.

Linear esters, such as DMC (dimethyl carbonate) and DEC (diethyl carbonate), have low viscosity, but also low dielectric constant, so in order to obtain a solution with high ionic conductivity, mixed solvents such as PC+DEC and EC+DMC are generally used. These organic solvents have some taste, but in general, they can meet the requirements of the European Union's RoHS and REACH, and are materials with little toxicity and good environmental protection. At present, the inorganic anionic conductive salts mainly include LIBF4, LIPF6 and LiASF6, and their conductivity, thermal stability and oxidation resistance are in the following order

Conductivity: LiASF6 LiP6> LiClO4> LiF4 Thermal Stability: LiASF6>LiF4> LiPf6 Oxidation Resistance:

Liasf6 LiP6 Liff4 > LiASF6 have very high conductivity, stability, and battery charge discharge rate, but its application is limited due to the toxicity of arsenic. The most commonly used one is lipf6. At present, all the materials of lithium batteries commonly used, including electrolyte, can meet the requirements of the European Union's RoHS and REACH, and are environmentally friendly and good energy storage items.

Refer to this kind of literature, and if you want to consult it for free, you can go to Hans's (Materials Science) OA journal.

The main structural components of lithium-ion batteries.

Cathode materials (lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt oxide, etc. and their mixtures).

Anode materials (artificial graphite, modified natural graphite, etc.).

Separator material (polyethylene film, polypropylene film or composite film of both) electrolyte (EC, PC, DEC, DMC, EMC and other solvents and lithium hexafluorophosphate solution).

Positive and negative terminals (positive and negative tabs).

Shell (steel shell, aluminum shell, aluminum-plastic film).

Positive electrode, negative electrode, diaphragm paper, electrolyte, shell ......The specific structure depends on the specific battery.

At present, the most suitable for use as electrolyte solvents are mainly carbonate organic solvents, including propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC).

Gas Chromatography Analysis Conditions:

Column: SE-54 (30m capillary).

Column temperature: 60

Vaporization chamber: 250

Nitrogen:air:hydrogen 1:1:10 (300ml min).

Even if I was looking for this problem, I found it here, hehe.