High voltage lithium ion battery functional electrolyte and preparation method and application
A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as damage to positive electrode materials, insufficient stability of positive electrode materials, and performance degradation of battery charge and discharge cycles, etc., to inhibit dissolution, improve cycle performance and safety performance Effect
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[0032] Example 1
[0033] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and use Molecular sieve, calcium hydride, lithium hydride are purified, impurity, and water to obtain a mixed solvent; at room temperature and 25 ℃, the conductive lithium salt LiPF 6 Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain ordinary electrolyte; among them, conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 1.0mol / L;
[0034] (2) Add tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), and the amount of tris(trimethylsilane) phosphate is 2% of the mass of the ordinary electrolyte; obtain high-voltage lithium ion Battery function electrolyte.
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[0035] Example 2
[0036] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:2, and use Molecular sieve, calcium hydride, lithium hydride are purified to remove impurities and water to obtain a mixed solvent; at room temperature 28℃, the conductive lithium salt LiPF 6 Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain ordinary electrolyte; among them, conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 0.8mol / L;
[0037] (2) Add tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), and the amount of tris(trimethylsilane) phosphate is 1% of the mass of the ordinary electrolyte; obtain high-voltage lithium ion Battery function electrolyte.
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[0038] Example 3
[0039] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:3, and use Molecular sieve, calcium hydride, lithium hydride are purified to remove impurities and water to obtain a mixed solvent; at room temperature 28℃, the conductive lithium salt LiPF 6 Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain ordinary electrolyte; among them, conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 1.0mol / L;
[0040] (2) Add tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), and the amount of tris(trimethylsilane) phosphate is 1% of the mass of the ordinary electrolyte; obtain high-voltage lithium ion Battery function electrolyte.
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