A kind of non-aqueous electrolyte containing difluorovinylidene phosphate, lithium ion battery and application thereof
A technology of vinylene bisfluorophosphate and non-aqueous electrolyte, which is applied in the field of lithium-ion batteries, can solve the problems of fast decay of high-temperature cycle life, need to improve cycle performance, and decrease of high-temperature storage performance, and achieve low viscosity, high-quality and high-efficiency Low temperature stability and safety, effect of low impedance
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0031] (1) Preparation of electrolyte: The electrolyte is prepared in a glove box, the actual oxygen content in the glove box is less than 2 ppm, and the moisture content is less than 0.1 ppm, and the glove box is filled with 99.999% nitrogen. The battery grade organic solvents ethylene carbonate (EC), diethyl carbonate (DEC), propylene carbonate (PC), and propyl propionate (PP) were mixed uniformly in a mass ratio of 1:1:1:1 (at 100wt %), the fully dried 12.5wt% LiPF 6 Add above-mentioned organic solvent, add 0.5wt% of vinylene difluorophosphate with structural formula I, then add 0.5wt% of vinylene carbonate (VC) and 3.5wt% of 1,3-propane sultone ( PS2), prepared into a non-aqueous lithium-ion battery electrolyte, the total weight of the non-aqueous electrolyte is 100wt%.
[0032] (2) Preparation of lithium-ion batteries: using LiCoO 2 The positive electrode sheet is the active material; SiO-artificial graphite is used as the negative electrode sheet; polypropylene is used...
Embodiment 2-10 and comparative example 1-4
[0034] Examples 2-5 and Comparative Examples 1-4 were the same as Example 1 except that the composition of the electrolyte solution was different. The details are shown in Table 1.
[0035] Table 1
[0036]
[0037] The experimental examples 1-5 and comparative examples 1-4 were respectively tested for high temperature cycle performance and high temperature storage performance. The test indicators and test methods are as follows:
[0038] (1) Cycle performance: It is reflected by testing the capacity retention rate of the battery for N cycles at 25°C and 0.5C. The specific method is as follows:
[0039] Place the battery in a 25°C environment, and charge the formed battery to 4.45V (LiCoO with 0.5C constant current and constant voltage). 2 / SiO-artificial graphite), the cut-off current is 0.02C, and then discharge to 3.0V with 0.5C constant current. After such charge / discharge cycles, the retention rate of the capacity after the 600th cycle was calculated to evaluate its ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More