Lg Energy Solution, Ltd.

Lg Chem, Ltd

Se Mi Park

Yong Ju Lee

Su Min Lee

Dong Hyuk Kim

Rae Hwan Jo

Eun Kyung Kim

Jung Hyun Choi

Seok Koo Kim

Il Geun Oh

Yong Jun Kim

Seung Hyun Chung

Chae Ah Kim

Sun Young Shin

Je Young Kim

Seung Youn Choi

Janis Doelle

Ji Won Min

Se Hui Sohn

Provided are a negative electrode, which includes a current collector and a negative electrode active material layer disposed on the current collector, wherein the negative electrode active material layer includes a conductive material, a negative electrode active material, and a binder, the negative electrode active material includes a silicon-based active material having a convexity of 0.8 or more as measured using a particle shape analyzer, and the convexity is defined by the following Formula 1, and a secondary battery including the negative electrode.Convexity()=Convex hull perimeter()/Actual perimeter()  [Formula 1]

Negative electrode and secondary battery including the same

The present invention relates to a negative electrode active material including a spherical carbon-based particle, and a carbon layer disposed on the spherical carbon-based particle and including a nano-particle, wherein the nano-particle has a silicon core, an oxide layer disposed on the silicon core and including SiO(0<x≤2), and a coating layer covering at least a portion of the surface of the oxide layer and including LiF.

Negative electrode active material, negative electrode including the same, and secondary battery including the negative electrode

The present invention relates to a negative electrode which includes a negative electrode current collector, and a negative electrode active material layer formed on the negative electrode current collector, wherein the negative electrode active material layer includes a silicon-based active material and a carbon-based active material, wherein a ratio of an average particle diameter (D) of the carbon-based active material to an average particle diameter (D) of the silicon-based active material is in a range of 2 to 8, and a porosity of the negative electrode is in a range of 48% to 62%.

The present invention relates to a negative electrode active material including a silicon-based core, a first coating layer positioned on the silicon-based core, and a second coating layer positioned on the first coating layer, wherein the second coating layer includes a metal material doped onto a surface thereof.

Negative electrode active material with metal dopant, and negative electrode, and lithium secondary battery including the same

The present invention relates to a negative electrode active material including silicon-based oxide particles and a metal distributed on a surface, inside, or on the surface of and the inside the silicon-based oxide particles, wherein compressive fracture strength measured at a pressure of 100 mN is 170 MPa to 380 MPa, and the silicon-based oxide particles contain Si crystal grains having a crystal grain size of 3 nm to 20 nm.

Negative electrode active material, preparation method thereof, and negative electrode and secondary battery including same

A negative electrode active material for a lithium secondary battery, the negative electrode active material including, based on 100 parts by weight of the total negative electrode active material, 5 parts by weight to 20 parts by weight of a first carbon-based particle, 55 parts by weight to 90 parts by weight of a second carbon-based particle, and 1 part by weight to 40 parts by weight of a silicon-based particle, wherein the specific surface area of the first carbon-based particle is 1.5 m/g to 4.5 m/g, the specific surface area of the second carbon-based particle is 0.4 m/g to 1.5 m/g, and the specific surface area of the first carbon-based particle is greater than the specific surface area of the second carbon-based particle, and capable of solving the problem of lifespan deterioration which may be caused by the use of a silicon-based particle as a negative electrode active material.

Negative electrode active material for lithium secondary battery and lithium secondary battery comprising the same

A negative electrode active material for a lithium secondary battery, which includes a silicon-based particle represented by M-SiO, wherein M is Li, Mg, Ca, Al, or Ti, and 0≤x<2, wherein the M-SiOincludes an amorphous phase at 20 wt % to 70 wt % based upon a total weight of the M-SiO, thereby exhibiting excellent initial efficiency and lifespan characteristics, and a preparation method thereof.

Negative electrode active material for lithium secondary battery and preparation method thereof

The present invention relates to: a negative electrode active material including silicon-based composite particles containing SiO(0<x<2) and a MgSiOphase, wherein the MgSiOphase includes a first MgSiOphase having an enstatite structure and a second MgSiOphase having a clinoenstatite structure at a weight ratio of 1:1 to 1:5; a negative electrode including the same; and a secondary battery including the negative electrode.

Negative electrode active material, negative electrode including the negative electrode active material, and secondary battery including the negative electrode

A silicon-carbon complex comprising carbon-based particles and silicon-based particles, wherein the silicon-based particles are dispersed and positioned on surfaces of the carbon-based particles, the carbon-based particles have a specific surface area of 0.4 m/g to 1.5 m/g, and the silicon-based particles are doped with one or more elements selected from the group consisting of Mg, Li, Ca, and Al, and a negative electrode active material for lithium secondary battery comprising the same.

Silicon-carbon complex and lithium secondary battery comprising the same

An electrode for batteries that does not include a metal-film-type current collector is disclosed herein. In some embodiments, the electrode comprises a composite having a core-shell structure including a core having an electrode active material, and a metal material coated on or doped in the surface of the core. A secondary battery having the electrode has increased capacity and energy density and exhibits improved lifespan characteristics.

Electrode having no current collector and secondary battery including the same

The present invention relates to a method of preparing a negative electrode active material which includes forming a mixture by mixing LiO and SiO(0&#x3c;x&#x3c;2) particles including SiO, forming a reaction product by performing a heat treatment on the mixture at 400&#xb0; C. to 600&#xb0; C., and removing a portion of lithium silicate in the reaction product by washing the reaction product.

Method of preparing negative electrode active material

The present invention relates to a silicon-based particle-polymer composite, which includes silicon-based particles; and a polymer coating layer formed on the silicon-based particles, in which the polymer coating layer includes metal-substituted poly(acrylic acid) in which hydrogen atoms in carboxyl groups of the poly(acrylic acid) chain are substituted with one or more selected from the group consisting of K, Na and Li.

Silicon-based particle-polymer composite and negative electrode active material comprising the same

The present invention provides a curing die for manufacturing a gel polymer electrolyte, and a method for manufacturing a gel polymer battery cell by using the same, the curing die comprising: a first die having a recessed part, which is formed inside a battery case and has a processing battery cell mounted therein and including an electrode assembly and a composition for forming the gel polymer electrolyte; and a second die coupled to the first die so as to seal the processing battery cell mounted in the recessed part.

Curing die for manufacturing gel polymer electrolyte, and method for manufacturing gel polymer battery cell by using same

A method of manufacturing a high loading electrode, which prevents the phenomenon of the binder being lifted, does not cause drying of the electrode slurry, and does not cause damage of the electrode layer and reduction of the electrode strength at the corners in the punching is provided. The method of manufacturing the high loading electrode includes applying an electrode slurry on a release film to thereby produce an electrode layer having the release film attached thereto, punching the electrode layer having the release film attached thereto to provide a plurality of punched electrode layers, each punched electrode layer having a size of a unit electrode, separating and removing the release film from the punched electrode layers, and stacking and rolling at least two punched electrode layers on a current collector.

Method for manufacturing high-loading electrode

The present invention provides a battery cell including: an electrode assembly including an electrode tab protruding toward at least one external side; a battery case including a receiving portion on which the electrode assembly is received; and an electrode lead connected to the electrode tab to be connected to an external device, wherein the electrode lead may include: a tab connecting portion electrically connected to the electrode tab; and a protruding extension protruding outside of the battery case in a state of extending from the tab connecting portion to be electrically connected to the external device, and the tab connecting portion may be formed so that a length of a width direction perpendicular to a protruding direction of the electrode tab may be relatively larger than that of the electrode tab.

Growing community of inventors

Daejeon, South Korea

Se Mi Park