Security lithium-ion power battery electrolyte and lithium-ion power battery
A power battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of negative impact, poor mutual solubility, easy to damage the layered structure of graphite anode, and achieve stable film formation, low impedance, and improved The effect of power output and low temperature output performance
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Embodiment 1
[0028] Electrolyte preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=3:2:5, and then add to the mixed solution Slowly add 1.0mol / L lithium hexafluorophosphate and 0.1mol / L lithium bisfluorosulfonyl imide, and finally add 0.3wt% lithium difluorophosphate (LiPO 2 f 2 ), 1wt% vinyl sulfate (DTD), 0.5wt% vinylene carbonate (VC) and 2wt% o-terphenyl (o-TP), after stirring evenly, the lithium-ion battery electrolyte of Example 1 was obtained.
[0029] Inject the prepared lithium-ion power battery electrolyte into the fully dried graphite / LiNi 0.5 co 0.2 mn 0.3 o 2 In the power battery, after the battery is put on hold at 45°C, formed in a high-temperature fixture and sealed twice, it is routinely divided.
[0030] 1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.20V at 1C constant current and constant voltage, with a cut-off ...
Embodiment 2~8
[0039] Embodiment 2~8 and comparative example 1~4
[0040] Examples 2-8 and Comparative Examples 1-4 are the same as Example 1 except that the proportions of the components of the electrolyte are added as shown in Table 1. Table 1 is the composition ratio of each component of the electrolyte solution of Examples 1-8 and Comparative Examples 1-4:
[0041]
[0042]
[0043] Table 1
[0044] In the above Table 1, the abbreviations / chemical formula corresponding names of each chemical substance are as follows:
[0045] LiPF 6 (lithium hexafluorophosphate), LiFSI (lithium difluorosulfonyl imide), LiDFOB (lithium difluorooxalate borate), EC (ethylene carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), PP (propylene Propyl carbonate), DMC (dimethyl carbonate), PC (propylene carbonate), LiPO 2 f 2 (Lithium difluorophosphate), DTD (ethylene sulfate), o-TP (o-terphenyl), FBP (2-fluorobiphenyl), CHB (cyclohexylbenzene), BP (biphenyl), m-TP ( m-terphenyl), Tol (...
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