A non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte
A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as SEI film rupture or gradual dissolution, lower cycle performance of lithium-ion batteries, separation of positive and negative electrodes and diaphragms, etc., to improve internal power Chemical properties, avoiding intragranular cracks, and reducing the effect of dissolution
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[0035] Example 1
[0036] Electrolyte preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate in a mass ratio of EC: DEC: EMC = 3:3:4, and then add to the mixed solution Slowly add 12.5% by weight of lithium hexafluorophosphate, and finally add 0.5% by weight based on the total electrolyte weight of the phosphate compound represented by the structure of formula (I) (specifically as shown in the list), and stir well to obtain the lithium ion battery of Example 1 Electrolyte.
[0037] Inject the prepared lithium-ion power battery electrolyte into fully dried artificial graphite material / LiNi 0.6 Co 0.6 Mn 0.2 O 2 In the battery, after the battery is stored at 45°C, formed into a high-temperature jig, and sealed again, it is routinely divided.
[0038] 1) Battery cycle performance test at room temperature: At 25℃, charge the divided battery to 4.2V at 1C constant current and constant voltage, cut-off current 0.05C, and...
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[0044] Example 2-9 and Comparative Example 1-5
[0045] As shown in Table 1, in Examples 2-9 and Comparative Examples 1-5, except that the composition ratio of each component of the electrolyte is added as shown in Table 1, the others are the same as in Example 1.
[0046] Table 1 The composition ratio of the electrolytes of Examples 1-9 and Comparative Examples 1-5
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[0048]
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