A high-voltage long-cycle additive for lithium ion battery, non-aqueous electrolyte for lithium ion battery containing the additive and application thereof
A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of lithium-ion battery non-aqueous electrolyte, can solve the problems of storage performance and safety performance degradation, easy decomposition, etc., and achieve the purpose of inhibiting catalytic oxidation decomposition, inhibiting oxidation reaction, and good The effect of cycle stability
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Embodiment 1
[0024] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound and lithium-ion battery high-voltage long-cycle additive (that is, phosphorus-containing double-bond compound); the mass fraction of phosphorus-containing double-bond compound in the electrolyte is 3%, the concentration of lithium salt compound is 0.8mol / L, and the organic solvent is a mixed solvent of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate, wherein ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate The mass ratio is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is
[0025] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan.
[0026] The preparation method of the lithium-ion battery non-aqueous electrolyte of the present embodiment comprises the following steps:
Embodiment 2
[0035] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound and lithium-ion battery high-voltage long-cycle additive (that is, phosphorus-containing double-bond compound); the mass fraction of phosphorus-containing double-bond compound in the electrolyte is 3%, the concentration of lithium salt compound is 1.5mol / L, and the organic solvent is a mixed solvent of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate, wherein ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate The mass ratio is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is
[0036] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan.
[0037] The preparation method of the lithium-ion battery non-aqueous electrolyte of the present embodiment comprises the following steps:
[0038] 1) Get ethylene carbonate, ethyl methyl ...
Embodiment 3
[0042] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound, lithium-ion battery high-voltage long-cycle additive (i.e. phosphorus-containing double bond compound) and the second type of additive; phosphorus-containing double bond in the electrolyte Compounds account for 3% of the total mass of the electrolyte, the mass fraction of the second additive is 1%, the concentration of the lithium salt compound is 0.8mol / L, and the organic solvent is ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate. Mixed solvent, wherein the mass ratio of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is
[0043] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan; the second type of additive is tris(trimethylsiloxy)borate.
[0044] The preparation met...
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