Electrolyte for lithium secondary battery and lithium secondary battery including the same
A lithium secondary battery and electrolyte technology, applied in the direction of secondary batteries, lithium batteries, organic electrolytes, etc., can solve the problems of battery cycle characteristics and degradation of high-temperature storage characteristics
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[0098] According to an exemplary embodiment, the electrode assembly may be accommodated in the case 170 together with an electrolytic solution to define the lithium secondary battery 100 .
[0099] Electrode tabs may be respectively formed from the cathode current collector 110 and the anode current collector 120 belonging to each electrode unit 160 , and may extend to one side of the case 170 . The electrode tabs may be fused together with one side of the case 170 to form electrode leads extending or exposed outside the case 170 .
[0100] The lithium secondary battery 100 may be manufactured in, for example, a cylindrical shape (using a can), a square shape, a pouch shape, or a coin shape.
[0101] Hereinafter, preferred embodiments are presented to describe the present invention more specifically. However, the following examples are only for illustrating the present invention, and it will be clearly understood by those skilled in the relevant art that various changes and m...
Embodiment 1 and Embodiment 2
[0105] The electrolyte solutions of Example 1 and Example 2 were prepared by adding 0.5% by weight and 1% by weight of the compound represented by the following formula 2 to the reference electrolyte solution prepared in Comparative Example based on the total weight of the mixed solvent .
[0106] [Formula 2]
[0107]
preparation example
[0108] Preparation Example: Preparation of Secondary Battery
[0109] By mixing Li[Ni] as the cathode active material in a weight ratio of 92:5:3 0.6 co 0.2 mn 0.2 ]O 2 , carbon black as a conductive material, and polyvinylidene fluoride (PVdF) as a binder to prepare a slurry. The prepared slurry was uniformly applied to an aluminum foil having a thickness of 15 μm, and vacuum-dried at 130° C. to prepare a cathode for a lithium secondary battery.
[0110] An anode slurry was prepared, which included 95% by weight of silicon-graphite composite (SiC) (which contained 10% by weight of silicon) as an anode active material, 1% by weight of Super-P as a conductive material, 2% by weight of Styrene Butadiene Rubber (SBR) as binder, and 2% by weight of Carboxymethyl Cellulose (CMC) as thickener. The prepared anode slurry was uniformly applied onto a copper foil having a thickness of 15 μm, followed by drying and pressing to prepare an anode.
[0111] The cathode and anode prepar...
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