Lg Chem, Ltd

Seo-Jae Lee

Taeyeon Kim

Ki-Young Lee

Minchul Jang

Sung Kyun Chang

Wonseok Chang

Juhyun Kim

Yong-Ju Lee

Sanghoon Choy

Seungyoun Choi

Jeyoung Kim

Euiyong Bang

Soon-Ho Ahn

Young-Min Kim

Ki-Tae Kim

Min-Gyu Kim

Minjung Ryu

Eun-Suok Oh

Sung-Man Lee

SeungRim Yang

Ki Woo Chun

ChanHong Lee

Jae-Phil Cho

Ou-Jung Kwon

JongMoon Jin

Suk-Myung Roh

You-Min Kim

Won-Seok Chang

Suk-Myung 1307-103 Gunyoung Villla Roh

Provided is a lithium secondary battery having improved discharge characteristics in a range of high-rate discharge while minimizing a dead volume and at the same time, having increased cell capacity via increased electrode density and electrode loading amounts, by inclusion of two or more active materials having different redox levels so as to exert superior discharge characteristics in the range of high-rate discharge via sequential action of cathode active materials in a discharge process, and preferably having different particle diameters.

Secondary battery of improved lithium ion mobility and cell capacity

The present invention relates to a method for improving charge/discharge cycle characteristics of a lithium secondary battery using a Si based anode active material, the method comprising surface-treating a surface of an anode current collector to have specific morphology, and preferably vapor-depositing a silicon film, as the anode active material by sputtering under application of bias voltage to the surface-treated anode current collector, and/or disposing an adhesive layer between the surface-treated anode current collector and silicon film, so as to reinforce bondability between the anode current collector and active material, ultimately leading to improvement of charge/discharge characteristics of the battery.

Method for improvement of performance of si thin film anode for lithium rechargeable battery

Disclosed is an electrode active material having a core-shell structure, which includes: (a) a core capable of intercalating and deintercalating lithium ions; and (b) a shell including a polymer or an oligomer having a glass transition temperature of 25&#xb0; C. or less when impregnated with an electrolyte, wherein a surface of the core is coated with the shell. Also, an electrode manufactured by using the electrode active material and a secondary battery including the electrode are disclosed. The shell (b) suppresses the formation of an SEI layer during initial charge of a battery, and prevents initial capacity reduction.

Electrode active material having core-shell structure

Disclosed is an electrode active material having a core-shell structure, which includes: (a) a core capable of intercalating and deintercalating lithium ions; and (b) a shell including a polymer or an oligomer having a glass transition temperature of 25&#xb0; C. or less when impregnated with an electrolyte, wherein a surface of the core is coated with the shell. Also, an electrode manufactured by using the electrode active material and a secondary battery including the electrode are disclosed. The shell (b) suppresses the formation of an SEI layer during initial charge of a battery, and prevents initial capacity reduction. Accordingly, it is possible to achieve a high capacity battery. The electrode active material having a core-shell structure, specially a metal (loid) based electrode active material having a core-shell structure can have a slightly higher electric capacity, compared to a conventional electrode active material, specially a conventional metal (loid) based electrode active material, and can minimize gas generation during charge/discharge.

Provided is an electrode mix for a secondary battery containing an electrode active material, comprising a PVA having a degree of polymerization of more than 2500 and a degree of saponification of more than 90% as a binder, and a lithium secondary battery comprising the same. Use of the binder according to the present invention can provide advantageous effects such as improved adhesive strength between the electrode mix and current collector and between the electrode mixes, prevention of the peeling and separation of the active material even after repeated charge/discharge cycles, and inhibition of decreases in the capacity or output power retention rate of the secondary battery.

Electrode material containing polyvinyl alcohol as binder and rechargeable lithium battery comprising the same

Disclosed are an electrode active material, having a composition of SnPx (0.9&#x2266;x&#x2266;0.98), an electrode comprising the same, and a lithium secondary battery comprising the electrode. Also disclosed is a method for preparing an electrode active material having a composition of SnPx (0.9&#x2266;x&#x2266;0.98), the method comprising the steps of: preparing a mixed solution of a Sn precursor, trioctyl phosphine (TOP) and trioctyl phosphine oxide (TOPO); and heating the solution. The application of the teardrop-shaped single-crystal SnP0-94 particles as an anode active material for lithium secondary batteries can provide an anode having very excellent cycling properties because the active material has a reversible capacity, which is about two times as large as that of a carbon anode, along with a very low irreversible capacity, and it is structurally very stable against Li ion intercalation/deintercalation in a charge/discharge process, indicating little or no change in the volume thereof.

Highly reversible lithium intercalating electrode active material, preparation method thereof, electrode and secondary battery comprising the same

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Daejeon, South Korea

Seo-Jae Lee