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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 cycle performance degradation, achieve the effect of inhibiting oxidation reaction and improving cycle performance
Active Publication Date: 2015-04-08
NINGDE AMPEREX TECH
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[0005] Depend on 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
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Embodiment 1
[0036] Preparation of lithium-ion secondary battery positive pole piece: Lithium cobalt oxide, conductive agent SuperP, binder PVDF are mixed with N-methylpyrrolidone (NMP) at a mass ratio of 96:2.0:2.0 to make a lithium-ion secondary battery positive pole Slurry, coated on the current collector aluminum foil, the coating amount is 0.0194g / cm 2; After drying at 85°C, carry out cold pressing; then trim, cut into pieces, and slitting, dry at 85°C for 4 hours under vacuum conditions, weld the tabs, and make positive pole pieces of lithium-ion secondary batteries;
[0037] Preparation of lithium-ion secondary battery negative electrode sheet: mix graphite with conductive agent SuperP, thickener CMC, and binder SBR with pure water at a mass ratio of 96.5:1.0:1.0:1.5 to make a slurry, and coat it on the set Fluid copper foil and dried at 85°C, the coating weight is 0.0089g / cm 2 ; Then trimming, cutting, and slitting, drying under vacuum conditions at 110°C for 4 hours, welding the ...
Embodiment 2
[0041] Preparation of lithium-ion secondary battery positive pole piece: same as Example 1;
[0042] Preparation of lithium-ion secondary battery negative pole piece: same as Example 1;
[0043] Preparation of lithium-ion secondary battery electrolyte: use 2-cyano-s-triazine instead of 2,4,6-tricyano-s-triazine in Example 1, and the rest are the same as in Example 1;
[0044] Preparation of lithium ion secondary battery: same as Example 1.
Embodiment 3
[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: replace 2,4,6-tricyano-s-triazine in Example 1 with 2-butylcyano-s-triazine, and the rest are the same as in Example 1;
[0049] Preparation of lithium ion secondary battery: same as Example 1.
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Abstract
The invention provides a lithium ion secondary battery and an electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, a non-aqueous solvent, and an addition agent at least containing 1, 3-propane sultone (PS), fluoroethylene carbonate (FEC) and an s-triazine structural compound, wherein the s-triazine structural compound is represented by a general formula (1), a general formula (2) or a general formula (3); in the general formula (1), the general formula (2) or the general formula (3), n is an integral number of 0-5, and R1, R2 and R3 are hydrogen atoms or C1-C6 alkyl group; and the hydrogen atoms on the alkyl group can be partially or wholly replaced by fluorine atoms. The lithium ion secondary battery comprises a positive plate, a negative plate, a diaphragm arranged between the adjacent positive plate and the negative plate, and the electrolyte of the lithium ion secondary battery. According to the lithium ion secondary battery and the electrolyte thereof provided by the invention, oxidation reaction between the electrolyte and a cathode material can be inhibited, and the cycle performance under the conditions of high temperature and high voltage is improved.
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] Lithium-ion secondary batteries have the advantages of high working voltage, long life and fast charging speed. However, 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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