Electrolyte for high multiplying power lithium ion battery and preparation method thereof
A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems that the additive content is not easy to be too high, and the cycle performance of the battery is reduced, so as to reduce the migration force, improve the conductivity, and improve the rate. performance effect
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Embodiment 1
[0042] The first step carries out ternary mixing with cyclic carbonate solvent PC, EC and linear carbonate solvent DMC, wherein PC is 18% (wt), EC is 30% (wt), DMC is 52% (wt), by Combining vacuum drying method, distillation crystallization method, and 4A molecular sieve adsorption method to purify and remove water and impurities;
[0043] The second step is to add a certain amount of conductive lithium salt LiODFB to the above solvent at 20°C, and stir evenly to form an electrolyte solution with a concentration of 1.0mol / L;
[0044] In the third step, a certain amount of composite electrolyte salt tetraethylammonium tetrafluoroborate (purity>99.99%) is added to the electrolytic solution, and its concentration is 0.3 mol / L.
[0045] As mentioned above, the functional electrolyte solution for improving the rate performance of lithium-ion batteries of the present invention is prepared.
Embodiment 2
[0047]Same as Example 1, except that the solvent is 32% EC, 15% PC, 30% DMC, and 23% EMC by mass ratio.
Embodiment 3
[0049] Same as Example 1, except that the solvent is 33% EC, 37% DMC, and 30% EMC in mass ratio.
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