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Lithium ion secondary battery and electrolyte thereof
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A secondary battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reduced cycle performance and increased expansion rate, and achieve the effects of inhibiting oxidation reactions, improving cycle performance and storage performance
Active Publication Date: 2013-07-10
NINGDE AMPEREX TECH
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[0005] from figure 1 It can be seen that when the voltage is less than 4.2V, ethylene carbonate (VC) and fluoroethylene carbonate (FEC) can effectively improve the cycle performance, but when the voltage is higher than 4.4V, the cycle performance is significantly reduced under high temperature conditions ;from figure 2 It can be seen that the expansion rate increases significantly when the voltage is 4.4V, that is, when the voltage is 4.4V, the high-temperature storage performance is much worse than that of 4.2V
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Embodiment 1
[0041] Preparation of positive electrode sheet for lithium ion secondary battery: Lithium cobaltate, conductive carbon (SuperP), binder polyvinylidene fluoride (PVDF) and N-methylpyrrolidone (NMP) in mass ratio = 96:2.0:2.0 Mix evenly to make lithium-ion secondary battery positive electrode slurry, with a coating weight of 0.0194g / cm 2 Coated on the aluminum foil of the current collector, dried at 85°C and then cold-pressed; then trimmed, cut into pieces, and divided into strips, and then dried at 85°C for 4 hours under vacuum conditions, and welded the tabs to make a lithium-ion battery. Secondary battery positive pole piece.
[0042] Preparation of lithium-ion secondary battery negative electrode sheet: graphite, conductive carbon (SuperP), thickener sodium carboxymethyl cellulose (CMC), binder styrene-butadiene rubber (SBR) in mass ratio = 96.5:1.0:1.0 : 1.5 mixed with pure water to make a slurry, the coating weight is 0.0089g / cm 2 Coated on the copper foil of the current...
Embodiment 2
[0046] Preparation of lithium-ion secondary battery positive pole piece: same as Example 1;
[0047] Preparation of lithium-ion secondary battery negative pole piece: same as Example 1;
[0048] Preparation of lithium ion secondary battery electrolyte: 1-allyl-3,5-dimethylisocyanurate is used instead of 1-allyl-3,5-dimethylisocyanurate in Example 1 Ester, all the other are with embodiment 1;
[0049] Preparation of lithium ion secondary battery: same as Example 1.
Embodiment 3
[0051] Preparation of lithium-ion secondary battery positive pole piece: same as Example 1;
[0052] Preparation of lithium-ion secondary battery negative pole piece: same as Example 1;
[0053] Preparation of lithium-ion secondary battery electrolyte: 1-allyl-3,5-dimethylisocyanurate in Example 1 is replaced by 1,3-diallyl-5-methylisocyanurate Ester, all the other are with embodiment 1;
[0054] Preparation of lithium ion secondary battery: same as Example 1.
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Abstract
The invention provides a lithium ion secondary battery and electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, a non-aqueous solvent and an additive, wherein the additive at least comprises 1,3-propane sultone (PS) and a sulfone isocyanurate structural compound; the sulfone isocyanurate structural compound is represented by a general formula (1), a general formula (2) or a general formula (3); the general formula (1), the general formula (2) and the general formula (3) are shown as specifications; in the general formula (1), n is a positive integer in the range of 1 to 3; in the general formula (2), n is a positive integer in the range of 1 to 3, R1 is a straight chain or branched chain alkyl from C1 to C6, and hydrogen atoms of the alkyl can be substituted by fluorine atoms partially or completely; and in the general formula (3), n is a positive integer in the range of 1 to 3, R1 and R2 are straight chains or branched chain alkyl from C1 to C6, and hydrogen atoms of the alkyl can be substituted by fluorine atoms partially or completely. The lithium ion secondary battery and the electrolyte thereof can inhibit oxidation reaction between the electrolyte and an anode material so as to improve cycling performance and storage performance under the conditions of high temperature and high pressure.
Description
technical field [0001] The invention relates to a secondary battery, in particular to a lithium ion secondary battery and its electrolyte. Background technique [0002] Although lithium-ion secondary batteries have the advantages of high working voltage, long life and fast charging speed, with the continuous development of technology, people require lithium-ion secondary batteries to have higher energy density and improve the working efficiency of lithium-ion secondary batteries. Voltage is one of the effective ways. [0003] In a lithium-ion secondary battery, after charging, the metal oxide as the positive electrode active material exhibits very strong oxidation at high potential, so it is easy to undergo an oxidation reaction with the electrolyte, resulting in the decomposition of the electrolyte. However, with the high voltage of lithium-ion secondary batteries, the oxidative decomposition of the electrolyte at the positive electrode intensifies, and the cycle performan...
Claims
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