Gel polymer electrolyte, lithium battery comprising gel polymer electrolyte, method for preparing gel polymer electrolyte, and method for preparing lithium battery
A technology of polymers and electrolytes, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, lithium batteries, etc., and can solve problems such as inapplicable printing methods
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[0071] According to another exemplary embodiment, the method for preparing a gel polymer electrolyte may include: preparing a first solution including a fluorine compound and an organic solvent; preparing a second solution including a monomer represented by Formula 1 and an organic solvent; and mixing the second solution A solution and a second solution, wherein the first solution or the second solution further comprises a first lithium salt.
[0072] In the method of preparing the gel polymer electrolyte, the fluorine compound can generate a protonic acid or a Lewis acid by reacting with residual moisture in an organic solvent. The first lithium salt may be inactive with respect to residual moisture. By mixing the first solution and the second solution, the fluorine compound reacts with the organic solvent to generate protic acid or Lewis acid. The cationic polymerization of the monomer of formula 1 is initiated by a protic acid or a Lewis acid to obtain a polymer.
[0073]...
preparation Embodiment 1
[0107] Using a high-energy ball mill (SPEX, 8000M), 3g of graphite particles (C1SR, Japan) with an average particle diameter of 25 μm and 1.5g of silicon fine particles with an average particle diameter of 100nm (Spherical Type, Nanostructured & Amorphous Materials, Inc., U.S.A.) Milled for 60 minutes to prepare negative active material in the form of graphite / silicon composite.
[0108] Preparation of lithium battery including composite negative active material
Embodiment 1
[0110] In an agate mortar, 70 parts by weight of the negative electrode active material prepared according to Preparation Example 1 was mixed with 15 parts by weight of graphite-based conductive material (SFG6, Timcal Inc.) and 30 parts by weight of A solution of 5% by weight polyvinylidene fluoride (PVdF) was mixed to prepare a slurry. The slurry was coated on a copper current collector with a thickness of 15 μm to a thickness of about 60 μm using a doctor blade, dried in a convection oven at 100° C. for 2 hours, and further dried at 120° C. for 2 hours under vacuum to prepare a negative plate.
[0111] At 20° C., a CR-2016 standard coin cell was prepared using the negative plate, a lithium metal counter electrode, and a polypropylene separator (Celgard 3510), to which the first electrolyte solution and the second electrolyte solution were sequentially added.
[0112] By adding 50 parts by weight of 1.3M LiN(SO4) dissolved in a mixture of ethylene carbonate (EC) and diethyl c...
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