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Lithium ion battery electrolyte and preparation method and application thereof
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A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion battery electrolyte and preparation, can solve problems such as damage to the contact interface between the pole piece and the electrolyte, and affect the normal operation of the battery, so as to reduce the internal gas production of the battery and promote lithium salt production. Effect of dissolving and improving wide temperature performance
Inactive Publication Date: 2020-11-13
SICHUAN PANOVASIC TECH
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Problems solved by technology
The above-mentioned electrolyte is sufficient to ensure the normal use of lithium-ion batteries at room temperature, but the electrolyte will decompose or be in a solidified state at higher or lower temperatures, and the contact interface between the pole piece and the electrolyte will be damaged, seriously affecting the normal operation of the battery
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Embodiment 1
[0028] Embodiment 1 (comparative example 1)
[0029] 20wt% tetracyclic sulfide 1 (2,2,4,4-tetrafluoro-1,3-dithietane), 50wt% dimethyl carbonate (DMC), 10wt% ethylenecarbonate (EC) , 10wt% LiPF 6 , 10wt% LiODFB are mixed according to the mass ratio, and the electrolyte solution is obtained by configuration.
[0030] Using ternary LiNi 0.5 co 0.2 mn 0.3 o 2 Graphite is used as the positive electrode active material and the negative electrode active material. Among them, the current collector of the positive electrode material is aluminum foil, and the positive electrode sheet is made of 92wt% LiNi 0.5 co 0.2 mn 0.3 o 2 , 4wt% acetylene black and 4wt% binder PVDF. The current collector of the negative electrode material is copper foil, and the negative electrode is composed of 92wt% graphite, 4wt% acetylene black and 4wt% binder PVDF. The diaphragm used in the present invention is a PP diaphragm.
[0031] The above-mentioned positive electrode, negative electrode, di...
Embodiment 2
[0032] Embodiment 2 (comparative example 2)
[0033] 60wt% DMC, 15wt% EC, 13wt% LiPF 6 , 10wt% LiODFB are mixed according to the mass ratio, and the electrolyte solution is obtained by configuration. Add 1wt% of salicylate oxime and 1wt% fluoroethylene carbonate (FEC), mix evenly, and configure to obtain an electrolyte solution.
[0034] The above electrolyte was assembled and tested according to Example 1.
Embodiment 3
[0036] 20wt% tetracyclic sulfide 1 (2,2,4,4-tetrafluoro-1,3-dithietane), 50wt% DMC, 10wt% EC, 10wt% LiPF 6 , 8wt% LiODFB were mixed according to the mass ratio, then 0.5wt% salicylate oxime and 1.5wt% FEC were added, and after mixing evenly, a full battery was assembled.
[0037] The above electrolyte was assembled and tested according to Example 1.
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Abstract
The invention discloses a lithiumionbattery electrolyte and a preparation method and application thereof. The electrolyte comprises a lithium salt, a solvent and an additive. The solvent comprises asolvent I and a solvent II. The additive comprises an additive I and an additive II. The solvent II is an episulfide solvent and accounts for 5-40% of the mass of the electrolyte, and the additive Iis an oximeorganic compound and accounts for 0.1-5% of the mass of the electrolyte. The solvent II and the additive I are combined for use, so that the viscosity of the electrolyte can be effectivelyreduced, an effective and stable SEI film is formed, the wide-temperature performance, the rate capability and the cycle performance of the battery can be improved by the electrolyte, and the impedance of the battery can be effectively reduced.
Description
technical field [0001] The invention relates to the technical field of lithium-ionbattery electrolyte, in particular to a lithium-ionbattery electrolyte, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and high voltage and are widely used. Commercial lithium-ion batteries include structures such as positive electrodes, negative electrodes, electrolytes, and separators. Among them, the commercialized electrolyte usually uses lithium hexafluorophosphate as the lithium salt, and ethylenecarbonate, propylene carbonate, diethyl carbonate, etc. as the solvent. The above-mentioned electrolyte is sufficient to ensure the normal use of lithium-ion batteries at room temperature, but the electrolyte will decompose or be in a solidified state at higher or lower temperatures, and the contact interface between the pole piece and the electrolyte will be damaged, seriously affecting the normal...
Claims
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