Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention contains, by wt %: 3.1 to 3.8% of Si, 0.5 to 1.5% of Al, 0.3 to 1.5% of Mn, 0.01 to 0.15% of Cr, 0.003 to 0.08% of Sn, 0.003 to 0.06% of Sb, and a balance of Fe and inevitable impurities. The non-oriented electrical steel sheet according to an embodiment of the present invention includes a surface portion present from a surface of the steel sheet to 1/10 of a thickness of the steel sheet in a direction from the surface of the steel sheet toward an inside of the steel sheet, and a central portion, and when punching the non-oriented electrical steel sheet, a length of a plastically deformed portion may be 100 ?m or less. In this case, the plastically deformed portion refers to a length of a portion from a punched end portion where hardness of the surface portion exceeds 1.10 times that of the central portion.

Abstract: A double oriented electrical steel sheet according to an exemplary embodiment of the present disclosure contains, in wt %, at least 2.0% of Si, more than 0% and 0.02% or less of AI, 0.02-0.50% of Mn, more than 0% and 0.004% or less of C, and 0.0005-0.005% of S, with the remainder comprising Fe and inevitable impurities, wherein the area percentage of grains having a grain size of 2000 ?m or less is 25% or less.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si at 0.2 to 4.3%, Mn at 0.05 to 2.5%, Al at 0.1 to 2.1%, Bi at 0.0001 to 0.003%, Ga at 0.0001 to 0.003%, and the balance of Fe and inevitable impurities.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, C at 0.004 wt % or less (excluding 0 wt %), Si at 2.5 to 4.0 wt %, P at 0.1 wt % or less (excluding 0 wt %), Al at 0.3 to 2.0 wt %, N at 0.003 wt % or less (excluding 0 wt %), S at 0.003 wt % or less (excluding 0 wt %), Mn at 0.15 to 2.5 wt %, Cr at 0.5 wt % (excluding 0 wt %), and the balance including Fe and other impurities unavoidably added thereto; satisfies the following Equation 1; and has an average grain size of 20 ?m or less. [Mn]?1450×[S]?0.8??[Equation 1] (In Equation 1, [Mn] and [S] represent a content (wt %) of Mn and S, respectively.).

Abstract: The present invention relates to a non-grain-oriented electrical steel sheet which is excellent in high-frequency iron loss, and a manufacturing method thereof. A non-grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.5 to 3.8 wt % of Si, 0.5 to 2.5 wt % of Al, 0.2 to 4.5 wt % of Mn, 0.0005 to 0.02 wt % of As, 0.0005 to 0.01 wt % of Bi, the balance Fe, and inevitable impurities, and satisfies the following [Equation 1]. 0.3?[surface fine crystal grain diameter]×[fine grain formation thickness]×([As]/[Bi])?5.0??[Equation 1] In Equation 1, [surface fine crystal grain diameter] means an average particle diameter (?m) of fine crystal grains in an electrode surface layer of an electrical steel sheet, [fine grain formation thickness] means a thickness (mm) of an electrode surface layer in which fine crystal grains are formed, and [As] and [Bi] mean a composition (wt %) of As and a composition (wt %) of Bi, respectively.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention may include, by wt %, 2.5 to 4.0% of Si, 0.1 to 1.5% of A1, 0.1 to 1.5% of Mn, and the remainder of Fe and inevitable impurities. In the non-oriented electrical steel sheet according to an embodiment of the present invention, an average grain size is 50 to 100 ?m, and an area ratio of grains having a grain size of 20 ?m or less is 0.5% or more.

Abstract: A non-oriented electrical steel sheet includes by wt %, Si: 3.0 to 4.0%, Al: 0.1 to 1.5%, Mn: 0.1 to 0.5%, Cr: 2 to 20% of Mn content, a sum of Sn and Sb: 0.006 to 0.1%, C: 0.0010 to 0.0050%, and 0.0003 to 0.0050% of at least one of N, S, Ti, Nb, and V, and balance being Fe and unavoidable impurities, in which an area fraction of a grain having a grain diameter which is 10% or less of a thickness of the steel sheet is 0.5% or more, a number fraction of the grain is 20% or more, and an average grain diameter from a central layer to a surface layer in a thickness direction of the steel sheet satisfies a relationship of D(surface)/D(center)?0.6.

Abstract: A double oriented electrical steel sheet includes: 2.0 to 6.0% of Si, 0.0005 to 0.04% of Al, 0.0001 to 0.003% of S, 0.02 to 1.0% of Mn, equal to or less than 0.003% of N, excluding 0%, equal to or less than 0.01% of C, excluding 0%, equal to or less than 0.01% of Ti excluding 0%, 0.005 to 0.10% of P as wt %, and a remainder including Fe and inevitable impurities. Such a double oriented electrical steel sheet satisfies Formula 1: [Mn]/[S]?60,??[Formula 1] where, [Mn] and [S] are contents (wt %) of Mn and S, respectively.

Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes at least one of 2.0 to 3.5% of Si, 0.3 to 3.5% of Al, 0.2 to 4.5% of Mn, 0.0030 to 0.2% of Sn, 0.0030 to 0.15% of Sb, 0.0040 to 0.18% of P, 0.0005 to 0.02% of Zn, and 0.0005 to 0.01% of Y for wt %, a remainder of Fe, and inevitable impurities, and satisfying Formula 1: 0.05?([Sn]+[Sb])/[P]?25??[Formula 1] (here, [Sn], [Sb], and [P] represent contents (wt %) of Sn, Sb, and P.

Abstract: The present disclosure relates to a method for manufacturing a non-oriented electrical steel sheet and the manufactured non-oriented electrical steel sheet, the method including: heating a slab containing, by wt %, 0.005% or less of C, 2.5 to 4.0% or less of Si, 0.1% or less of P, 0.1 to 2.0% of Al, 0.2 to 2.5% of Mn, 0.003% or less of N, 0.005% or less of Ti and Nb, 0.003% or less of S, 0.005 to 0.025% of V, 0.1% or less of Cu, and a balance of Fe and inevitably mixed impurities, and satisfying the following Expression 1; hot-rolling the slab to manufacture a hot-rolled sheet; cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet; and performing final annealing on the cold-rolled sheet, wherein [Expression 1] is represented by (51*[C])/12?0.002?[V]?(51*[C])/12+0.004 (in Expression 1, [C] and [V] represent contents (wt %) of C and V, respectively).

Abstract: A method of manufacturing a secondary battery, which includes: electrochemically charging a pre-lithiation cell including a positive electrode. The positive electrode comprises a positive electrode active material comprising a lithium manganese-based oxide and a lithium metal counter electrode. The electrochemical charging over-lithiates the positive electrode to form an over-lithiated positive electrode. Then, separating the over-lithiated positive electrode from the pre-lithiation cell and fabricating a secondary battery including the over-lithiated positive electrode and a negative electrode including a negative electrode active material; subjecting the secondary battery to a first charging to form a first-charged secondary battery; resting the first-charged secondary battery; and subjecting the rested secondary battery to a second charging. The maximum voltage of the secondary battery in the first charging is lower than the maximum voltage of the secondary battery in the second charging.

Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes, by weight %, Si: 2.5 to 6.0%, Al: 0.2 to 3.5%, Mn: 0.2 to 4.5%, Cr: 0.01 to 0.2%, P: 0.005 to 0.08%, Mg: 0.0005 to 0.05%, and a remainder including Fe and inevitable impurities, while satisfying Equation 1 below, and formed with an inner oxidation layer of a 0.2 to 5 ?m thickness inside a base steel sheet. ?2.5?[P]/[Cr]?[Mg]×100?6.5??[Equation 1] (In Equation 1, [P], [Cr], and [Mg] respectively represent a content (by wt %) of P, Cr, and Mg).

Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.0 to 4.0% of Si, 0.05 to 1.5% of Al, 0.05 to 2.5% of Mn, equal to or less than 0.005% of C (excluding 0%), equal to or less than 0.005% of N (excluding 0%), 0.001 to 0.1% of Sn, 0.001 to 0.1% of Sb, 0.001 to 0.1% of P, 0.001 to 0.01% of As, 0.0005 to 0.01% of Se, 0.0005 to 0.01% of Pb, 0.0005 to 0.01% of Bi, a remainder of Fe, and inevitable impurities, as wt %, wherein a Taylor factor (M) of each crystal grain included in a steel sheet is expressed in Formula 1, and an average Taylor factor value of the steel sheet is equal to or less than 2.75: M = ? ? CRSS [ Formula ? ? 1 ] (here, ? is a macro stress, and ?CRSS is a critical resolved shear stress).

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si at 0.2 to 4.3%, Mn at 0.05 to 2.5%, Al at 0.1 to 2.1%, Bi at 0.0001 to 0.003%, Ga at 0.0001 to 0.003%, and the balance of Fe and inevitable impurities.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, C at 0.004 wt % or less (excluding 0 wt %), Si at 2.5 to 4.0 wt %, P at 0.1 wt % or less (excluding 0 wt %), Al at 0.3 to 2.0 wt %, N at 0.003 wt % or less (excluding 0 wt %), S at 0.003 wt % or less (excluding 0 wt %), Mn at 0.15 to 2.5 wt %, Cr at 0.5 wt % (excluding 0 wt %), and the balance including Fe and other impurities unavoidably added thereto; satisfies the following Equation 1; and has an average grain size of 20 ?m or less. [Mn]?1450×[S]?0.8??[Equation 1] (In Equation 1, [Mn] and [S] represent a content (wt %) of Mn and S, respectively.

Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by weight %, 1.5 to 4.0% of Si, 0.7 to 2.5% of Al, 1 to 2% of Mn, 0.003 to 0.02% of Cu, at most 0.005% of S (not 0%), and the remainder comprising Fe and unavoidable impurities, and satisfies formulas 1 and 2 below. 150?[Mn]/[Cu]?250??[Formula 1] 3?[Cu]/[S]?7??[Formula 2] (here, [Mn], [Cu], and [S] represent Mn, Cu, and S contents (weight %), respectively.

Abstract: The present invention relates to a non-oriented electrical steel sheet with excellent magnetism and a manufacturing method thereof. A non-oriented electrical steel sheet according to an embodiment of the present invention includes Si at 2.5 to 3.8 wt %, Al at 0.5 to 2.5 wt %, Mn at 0.2 to 4.5 wt %, C at 0.005 wt % or less (excluding 0 wt %), S at 0.005 wt % or less (excluding 0 wt %), N at 0.005 wt % or less (excluding 0 wt %), Nb at 0.004% or less (excluding 0 wt %), Ta at 0.0005 to 0.0025 wt %, and the balance of Fe and inevitable impurities.

Abstract: The present invention relates to a non-grain-oriented electrical steel sheet which is excellent in high-frequency iron loss, and a manufacturing method thereof. A non-grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.5 to 3.8 wt % of Si, 0.5 to 2.5 wt % of Al, 0.2 to 4.5 wt % of Mn, 0.0005 to 0.02 wt % of As, 0.0005 to 0.01 wt % of Bi, the balance Fe, and inevitable impurities, and satisfies the following [Equation 1]. 0.3?[surface fine crystal grain diameter]×[fine grain formation thickness]×([As]/[Bi])?5.0??[Equation 1] In Equation 1, [surface fine crystal grain diameter] means an average particle diameter (?m) of fine crystal grains in an electrode surface layer of an electrical steel sheet, [fine grain formation thickness] means a thickness (mm) of an electrode surface layer in which fine crystal grains are formed, and [As] and [Bi] mean a composition (wt %) of As and a composition (wt %) of Bi, respectively.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention, comprises: Si: 2.0 to 3.5%, Al: 0.05 to 2.0%, Mn: 0.05 to 2.0%, In: 0.0002 to 0.003% by wt % and Fe and inevitable impurities as the remainder.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention may include, by weight, by weight, 2.0 to 3.5% of Si, 0.3 to 2.5% of Al, 0.3 to 2.5% of Mn, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and the remainder including Fe and impurities, and may satisfy the following Formula 1. 0.2?([Si]+[Al]+0.5×[Mn])/(([Ga]+[Ge])×1000)?5.27??[Formula 1] ([Si], [Al], [Mn], [Ga] and [Ge] represent the content (% by weight) of Si, Al, Mn, Ga and Ge, respectively).