Lg Chem, Ltd

Lg Energy Solution, Ltd.

Su Min Lee

Eun Kyung Kim

Yong Ju Lee

Sun Young Shin

Dong Hyuk Kim

Rae Hwan Jo

Se Mi Park

Oh Byong Chae

Jung Hyun Choi

Chang Hun Yun

Yeon Sik Choi

Je Young Kim

Sang Wook Woo

Chi Ho Jo

Su Yeon Lee

Il Geun Oh

Gi Dae Choi

Dong Sub Jung

Lilin Piao

Sang Seung Oh

Hyun Wook Kim

Seung Youn Choi

Chang Ju Lee

ChangHun Yun

Semi Park

Ilgeun Oh

Hye Hyeon Kim

Su Ji Jang

Kyu Tae Park

Hyun Min Jun

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

An electrode drying apparatus and a method of manufacturing an electrode using the same is provided. In the electrode drying apparatus, by inducing static electricity onto a back side of an electrode current collector of which a front surface is coated with an electrode slurry so that the electrode slurry has an electric charge opposite to an electric charge of an ionic binder contained in the electrode slurry as a binder, even when solvent volatilization occurs during a drying process of the electrode slurry, it is possible to prevent binders from being moved to a surface of the electrode slurry, and thus it is possible to improve an adhesive force between an electrode mixture layer formed by drying the electrode slurry and the electrode current collector.

Electrode coating apparatus, and electrode manufacturing method using 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

A negative electrode active material including a core containing SiO(0≤x<2) and a lithium-containing compound, and a shell disposed on the core and containing SiO(0≤x<2) and magnesium silicate.

Negative electrode active material, preparation method thereof, negative electrode including the negative electrode active material, 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 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

According to an exemplary embodiment of the present disclosure, a negative electrode active material includes metal-silicon-carbon based particles including a MSiC matrix, wherein M in the MSiC matrix is one or more selected from the group consisting of Li, Mg, Na, Ca, and Al, 0.35≤a≤1, and 1≤b≤2. Since at the time of charging and discharging a battery, formation of an irreversible phase may be minimized by the MSiC matrix, initial efficiency of the battery may be improved, and electrical conductivity, physical strength, and chemical stability may be improved, such that capacity and lifecycle characteristics of the battery may be improved.

Negative electrode active material, negative electrode including the negative electrode active material, secondary battery including the negative electrode, and method of preparing the negative electrode active material

A negative electrode active material including: silicon-containing composite particles including SiO(0<x<2) and pores; and a carbon layer on a surface of the silicon-containing composite particles and in the pores, in which the carbon layer includes a metal, the metal includes at least one selected from the group consisting of Li, Na and K, and the pores have an average diameter in a range of 2 nm to 45 nm, a negative electrode including the same, a secondary battery including the negative electrode and a method for preparing the negative electrode active material.

Negative electrode active material, negative electrode including negative electrode active material, secondary battery including negative electrode, and method for preparing negative electrode active material

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

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

The present invention relates to a negative electrode active material including a silicon-based composite and a carbon-based material, wherein the silicon-based composite includes SiO(0&#x2264;x&#x2264;2) including pores, a polymer disposed in the pores, and a metal compound disposed on a surface of the SiO(0&#x2264;x&#x2264;2) or on the surface and inside of the SiO(0&#x2264;x&#x2264;2), wherein the metal compound is a compound including at least one element selected from the group consisting of lithium (Li), magnesium (Mg), calcium (Ca), and aluminum (Al), a method of preparing the same, and a negative electrode and a lithium secondary battery which include the negative electrode active material.

Negative electrode active material, method of preparing the same, and negative electrode and lithium secondary battery which include the negative electrode active material

A negative electrode active material including a core containing SiO(0&#x2264;x&#x3c;2) and a lithium-containing compound, and a shell disposed on the core and containing SiO(0&#x2264;x&#x3c;2) and magnesium silicate.

The present invention relates to a composite negative electrode material for a secondary battery, and a negative electrode and a lithium secondary battery which include the same, and particularly to a composite negative electrode material for a secondary battery, which includes a graphene sheet, and two or more coating layers formed on both sides of the graphene sheet, wherein the two or more coating layers include at least one polymer coating layer and at least one pitch coating layer, and the graphene sheet and the two or more coating layers are included in a weight ratio of greater than 1:greater than 0.01 to less than 0.1, and a negative electrode and a lithium secondary battery which include the same.

Composite negative electrode material for secondary battery, and negative electrode and lithium 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.

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Daejeon, South Korea

Su Min Lee