Heat stress type thermal runaway prevention electrolyte and application thereof in secondary battery
A technology for secondary batteries and electrolytes, which is used in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, can solve problems such as limiting wide application, and achieve the effects of excellent performance, novel mechanism of action, and strong novelty.
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Embodiment 1
[0036] In the glove box, the LiPF 6 Soluble in Additive A1 In the electrolyte solution (wherein the additive accounts for 90% of the total mass of the electrolyte solution) is obtained. Assemble lithium-ion battery with this electrolyte, this electrolyte is in 150 o C can quickly aggregate. From figure 1It can be seen that the assembled lithium-ion battery can still obtain a specific discharge capacity of 172 mAh / g after 200 cycles of charging and discharging at 0.5 C. The assembled pouch battery has no combustion and explosion in the acupuncture test, and has high safety. Table 1 is the composition of the lithium-ion battery assembled with the electrolyte solution of Example 1.
[0037] Table 1
[0038]
Embodiment 2
[0040] In the glove box, add Additive A2 、LiPF 6 Dissolve in dimethyl carbonate, obtain electrolytic solution (wherein additive accounts for 5% of electrolytic solution gross mass), assemble lithium-ion battery with this electrolytic solution, this electrolytic solution is at 120 o C can quickly aggregate. From figure 2 It can be seen from the figure that the capacity retention rate of the assembled battery can reach 76% after 210 cycles at 0.5 C at room temperature. The assembled pouch battery not only did not burn and explode, but also maintained excellent voltage (4.4 V) and internal resistance (94 Ω) through the acupuncture test. Depend on image 3 As shown, the pouch battery after the acupuncture test was disassembled, and it was found that the interior of the battery was relatively complete. Table 2 is the composition of the lithium-ion battery assembled with the electrolyte solution of Example 2.
[0041] Table 2
[0042]
Embodiment 3
[0044] In the glove box, add Additive A3 , LiTFSI was dissolved in ethylene glycol dimethyl ether to obtain an electrolyte (wherein the additives accounted for 40% of the total mass of the electrolyte), and the lithium-sulfur battery assembled with the electrolyte, the electrolyte at 120 o C can quickly aggregate. From Figure 4 It can be seen from the figure that at 0.5 C charge and discharge, after 100 cycles of the battery, the discharge specific capacity still maintains 660 mAh / g. The assembled pouch battery has no combustion and explosion in the acupuncture test, and has high safety. Table 3 is the composition of the lithium-sulfur battery assembled with the electrolyte solution of Example 3.
[0045] table 3
[0046]
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Abstract
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