Lg Energy Solution, Ltd.

Lg Chem, Ltd

So-Mi Jeong

Dong-Wook Sung

Dae-Sung Jang

Da-Kyung Han

Min-Ji Kim

Won-Sik Bae

Jong-Yoon Lee

So-Yeong Lee

Young-Bok Kim

So-Jung Park

Kyeong-Hui Bae

Ji-Eun Kim

Jong-Hun Kim

Joo-Sung Lee

Sun-Mi Jin

Hye-Jin Kwon

Bo-Kyung Ryu

Jin-Woo Kim

Je-An Lee

Ji-Eun Lee

Seung-hyun Lee

Chan-Jong Kim

Jin-Young Shin

Yeon-Soo Kim

Hyun-Sup Lee

A separator for an electrochemical device, including a porous polymer substrate and an inorganic coating layer on at least one surface of the porous polymer substrate. The inorganic coating layer includes inorganic particles and a binder resin. The binder resin includes a PVAc-containing first binder resin and a PVDF-containing second binder resin.

Separator for electrochemical device and electrochemical device including the same

A separator for a lithium secondary battery, a method for manufacturing the same, and a lithium secondary battery including the separator, where the separator includes a porous polymer substrate having a plurality of pores, and a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes a plurality of inorganic particles and a binder polymer. The binder polymer includes a thermosetting phenolic resin having at least one hydroxyl group and at least one aromatic group. When the separator is exposed to high temperature, due to ignition or the like, the thermosetting phenolic resin in the porous coating layer is thermally cured to form a network structure by virtue of the structural characteristics of the separator. As a result, the separator has improved heat resistance as compared to the conventional separators and shows high adhesion to an electrode.

Separator for lithium secondary battery, manufacturing method therefor, and lithium secondary battery comprising same

A separator for a lithium secondary battery, a method for manufacturing the same and a lithium secondary battery comprising the same, where the separator includes a porous polymer substrate having a plurality of pores and a polymer coating layer on at least one surface of the porous polymer substrate. The polymer coating layer comprises a thermosetting phenol-containing resin having at least one hydroxyl group and at least one aromatic ring. A coating amount of the thermosetting phenol-containing resin is 0.01 g/mto 3 g/mof the porous polymer substrate based on one polymer coating layer.

Separator for lithium secondary battery, method for manufacturing same, and lithium secondary battery comprising same

A method for manufacturing a battery. According to the method, a combination of binder resin composition material and an organic solvent (electrolyte) that causes low dissolution of a polymer in the resin may be selected. The selected binder resin composition material, organic solvent (electrolyte) or both may be used to manufacture a battery to prevent possible degradation of the battery due to a possible decrease in interlayer adhesion of the resin caused by dissolution of the polymer in the resin as well as a possible increase in resistance to ion flow in an electrolyte in the battery due to the dissolution of the polymer into the electrolyte.

Method for manufacturing lithium ion secondary battery

Disclosed is a free-standing porous separator including a plurality of inorganic particles and a binder polymer positioned on the whole or a part of the surface of the inorganic particles to connect the inorganic particles with one another and fix them, wherein the binder polymer comprises a polyvinylidene fluoride (PVdF)-based binder polymer modified with an ester (COO)- or carboxyl (COOH)-containing monomer. An electrochemical device including the free-standing porous separator is also disclosed. It is possible to provide a porous separator which has a reduced dimensional change in an electrolyte, while showing improved tensile strength and/or elongation at the same time.

Porous separator and electrochemical device including the same

A method for manufacturing unit cells includes preparing a pre-cell having a first separator sheet and a plurality of first electrodes disposed on the first separator sheet while being spaced apart from one another; forming a cutting guide line having a plurality of though-holes spaced apart from one another on the pre-cell; and cutting the pre-cell along the cutting guide line to form a plurality of unit cells. An apparatus for manufacturing unit cells includes a hole-forming unit configured to form a cutting guide line on a pre-cell having a separator sheet and electrodes disposed on the separator sheet where the cutting guide line has a plurality of though-holes spaced apart from one another; and a cutting unit configured to cut the pre-cell along the cutting guide line to form a plurality of unit cells.

Method and apparatus for manufacturing unit cells

A separator substrate for an electrochemical device. The separator substrate has pores that are small and uniform in size, good physical strength and durability, and high dielectric breakdown voltage. Therefore, with the use of the separator substrate, the probability of short circuiting is low.

Substrate for separator of electrochemical device, separator including same, and method of forming battery cell separator

The separator according to the present disclosure and the electrochemical device including the same show low internal resistance between the separator and an electrode. The separator includes heat resistant particles in a heat resistant coating layer. The heat resistant particles include a particle-shaped inorganic material and fluorine (F) doped to a surface of the inorganic particles. When the internal temperature of a battery is increased during the operation of the battery, the separator shows improved heat resistance by virtue of an endothermic effect derived from a phase change of the heat resistant particles. In addition, decomposition of a lithium salt used as an ingredient of electrolyte is inhibited by the fluorine atoms introduced to the heat resistant particles, resulting in improvement of ion conductivity and resistance characteristics. Further, the separator including the heat resistant particles introduced thereto has excellent resistance characteristics and shows high oxidation stability of an electrolyte, resulting in improvement of the electrochemical stability of a battery.

Separator having heat resistant layer for electrochemical device and secondary battery comprising same

A separator for an electrochemical device, including a porous polymer substrate and an inorganic coating layer formed on at least one surface of the porous polymer substrate. The inorganic coating layer includes inorganic particles and a binder resin. The binder resin includes a polyvinylidene fluoride (PVdF)-based polymer having a main chain, and at least one hydrogen atom in the main chain of the PVdF-based polymer is substituted with an acrylic compound-derived functional group.

Separator for electrochemical device and method for manufacturing the same

The present disclosure relates to a separator for a lithium secondary battery comprising a porous substrate, and a porous coating layer disposed on at least one surface of the porous substrate and comprising inorganic particles and binder polymer, wherein the binder polymer is terpolymer including 65 to 90 weight % of a repeat unit derived from vinylidenefluoride (VDF), 1 to 28 weight % of a repeat unit derived from hexafluoropropylene (HFP) and 5 to 28 weight % of a repeat unit derived from chlorotrifluoroethylene (CTFE), and the separator has adhesiveness towards electrode ranging from 30 gf/25 mm to 150 gf/25 mm and machine direction (MD) thermal shrinkage of 1 to 18% and transverse direction (TD) thermal shrinkage of 1 to 17%, and a lithium secondary battery comprising the same, wherein the separator has uniform micropores on the surface, and thus has the increased adhesive surface area with electrode and consequential improved adhesiveness towards electrode.

Separator for lithium secondary battery with improved adhesiveness towards electrode and resistance characteristics and lithium secondary battery comprising the separator

A separator including a porous polymer substrate, and a porous coating layer, and an electrochemical device comprising the same. The porous coating layer includes P(VDF-TrFE-CTFE) and PVDF-CTFE as a binder polymer. The separator has a lower resistance by changing the characteristics of the binder polymer.

Separator and electrochemical device comprising same

A polyolefin separator for an electrochemical device, the separator having a plurality of pores having an average pore size of 20 nm to 40 nm and a maximum pore size of 50 nm or less and including a polyolefin resin having a polydispersity index (PDI) of in a range of 2.5 to 4.2. The polyolefin separator may have a strain rate of 25% or less as measured when a tensile stress is applied at 60° C. at 15 MPa for 60 seconds, and the polyolefin separator may have a recovery time of 200 seconds or less to reach a recovery rate of 70% as measured after removing a tensile stress applied at 70° C. at 2 MPa for 180 seconds.

Polyolefin separator for an electrochemical device and electrochemical device including same

The present disclosure relates to a coating bar and a method for manufacturing a separator using the same. The coating bar according to the present disclosure may form a coating layer having an area with different thicknesses by one coating. Additionally, the method for manufacturing a separator according to the present disclosure includes forming a porous coating layer using a predetermined coating bar, to manufacture a separator including the porous coating layer having an area with different thicknesses. In particular, the present disclosure manufactures the separator having a larger thickness at the two ends than at the center, thereby avoiding a lack of adhesive strength at the two ends in a transverse direction in the adhesion between the separator and the electrode, and exhibiting uniform adhesive strength over the whole interface between the separator and the electrode.

Coating bar and method for manufacturing separator using the same

A separator including a porous polymer substrate and an inorganic coating layer formed on at least one surface of the porous polymer substrate. The inorganic coating layer includes inorganic particles and a binder resin. The binder resin includes a first binder resin and a second binder resin. The first binder resin comprises a polyvinylidene fluoride (PVdF)-based polymer and the second binder resin comprises an acrylic polymer. The acrylic polymer has an acid value of 1 or less and a glass transition temperature, T, of 90° C. to 130° C. In addition, the inorganic coating layer has a high content of binder resin at the top layer portion to provide excellent adhesion between the separator and an electrode.

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Daejeon, South Korea

So-Mi Jeong