Solvent:
Propylene carbonate PC ﹝Propylene carbonate﹞
Ethylene carbonate EC ﹝Ethylene carbonate﹞
Carbonate of dimethyl Ester DEC ﹝Dimethyl? Carbonate﹞
Methyl ester Propiolic acid1,4 – Butylpropyl ester GBL ﹝γ-?Butyrolactone﹞
Solute LiPF6 ﹝Main﹞LiBF4 LiClO4 LiAsF6 LiCF3SO3
Solute:
LiPF6 ﹝Mainly﹞
LiBF4
LiClO4
LiAsF6
LiCF3SO3
Working principle:
1. The structure and working principle of lithium-ion battery: The so-called lithium-ion battery refers to the use of two compounds that can reversibly insert and deintercalate secondary lithium A ions. battery composed of positive and negative electrodes. People call this unique mechanism of lithium-ion batteries that relies on the transfer of lithium ions between positive and negative electrodes to complete the charging and discharging of the battery, "batteries of rocking chairs”, commonly known as “lithium batteries”. Take LiCoO2 as an example: (1) When the battery is charging, lithium ions are deintercalated from the positive electrode and integrated into the negative electrode, and vice versa when discharging. This requires an electrode to be in a lithium-integrated state before assembly. Generally, a lithium-integrated transition metal oxide with a potential higher than 3V compared to lithium and stable in air is selected as the positive electrode, such as LiCoO2, LiNiO2. , LiMn2O4 and LiFePO4. ⑵ For the negative electrode material, choose an intercalable lithium compound with a potential as close as possible to the potential of lithium, such as various carbon materials including natural graphite, synthetic graphite, carbon fiber, carbon in mesophase granules, etc. and metal oxides, including SnO, SnO2, composite tin oxide SnBxPyOz (x=0.4~0.6, y=0.6~0.4, z=(2+3x+5y)/2), etc.
If the mobile phone battery is exhausted all at once, it needs to be recharged several times a day and the charging time becomes longer, or if the mobile phone is discharged. and immediately displays 6% as soon as it is turned on. 70% charge means the cell phone battery is no longer durable and battery performance has been lost. Typically, cell phone batteries have a long lifespan and their performance declines after two to three years of use. Among the different cell phone battery tests, there will be a performance test. Shrapnel microneedle modules that can transmit large currents can be used. Its average lifespan is more than 20W to cope with high-frequency testing of mobile phone lithium batteries. Can it be used continuously, but self-cleaning designte of the shrapnel head can also prevent the shrapnel from becoming contaminated, thereby ensuring the long-term stability of the test. During the test, the shrapnel microneedle module uses different head shapes to contact different test points, which is conducive to current conduction and signal transmission, and can improve the test efficiency.