Lithium-ion battery electrolyte and lithium ion battery with the same
A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion battery cycle capacity attenuation, aggravated transition metal element dissolution, and oxidative decomposition, etc., to improve cycle stability. , The effect of improving interface properties and reducing interface impedance
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[0030] Example 1
[0031] An electrolyte for lithium ion batteries, which mainly contains organic solvents, conductive lithium salts and additives. The additives include common additives and phosphate additives. The organic solvent is composed of ethylene carbonate and ethyl methyl carbonate, and the weight ratio of ethylene carbonate to ethyl methyl carbonate is EC:EMC=1:2. The conductive lithium salt LiPF 6 The concentration in the organic solvent is 0.8 mol / L, the commonly used additives are vinylene carbonate and fluoroethylene carbonate, and the amounts are 1.0% and 2.0%, respectively. The phosphate ester additive is trimethyl phosphate, and the amount is 3.0 wt.%.
[0032] The preparation method of the electrolyte in this embodiment is:
[0033] (1) Mix the organic solvents in proportion to use Molecular sieve, calcium hydride, lithium hydride purification and impurity removal, water removal;
[0034] (2) Dissolve the conductive lithium salt in the above organic solvent at ro...
Example Embodiment
[0037] Example 2
[0038] The preparation method of the electrolyte of this embodiment is the same as that of Embodiment 1, except that the solvent is ethylene carbonate and ethyl methyl carbonate, and the weight ratio is 1:3. The conductive lithium salt LiPF 6 The concentration in organic solvent is 1.0 mol / L. The commonly used additives are vinylene carbonate and 1,3-propane sultone, and the amounts are 1.0% and 1.0% respectively. The phosphate ester additive is trimethyl phosphate, and the amount is 5.0 wt.%. The electrolyte thus prepared was applied to LiNi according to the same method as in Example 1. 0.8 Co 0.15 Al 0.05 O 2 / Graphite flexible packaging battery, test LiNi 0.8 Co 0.15 Al 0.05 O 2 Graphite flexible packaging battery has a charging and discharging cycle performance of 3.0-4.2V, 1C rate under normal temperature environment.
Example Embodiment
[0039] Example 3
[0040] The preparation method of the electrolyte of this embodiment is the same as that of Embodiment 1, except that the solvent is ethylene carbonate and diethyl carbonate, and the weight ratio is 1:2. The conductive lithium salt LiPF 6 The concentration in organic solvent is 1.0 mol / L. The commonly used additives are vinylene carbonate and fluoroethylene carbonate, and the amounts are 1.0% and 3.0% respectively. The phosphate ester additive is tri-tert-butyl phosphate, and the amount is 0.5 wt.%. The electrolyte thus prepared was applied to LiNi according to the same method as in Example 1. 0.5 Co 0.2 Mn 0.3 O 2 / Graphite flexible packaging battery, test LiNi 0.5 Co 0.2 Mn 0.3 O 2 / The cycle performance of graphite flexible packaging battery at 3.0-4.35V, 1C rate charge and discharge under normal temperature environment.
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