Lg Chem, Ltd

Lg Energy Solution, Ltd.

Dong-Sub Jung

Je-Young Kim

Sang-Wook Woo

Yo-Han Kwon

Byung-Hun Oh

Sung-Kyun Chang

Ki-Tae Kim

Hyun-Chul Kim

Chang-Ju Lee

Hye-Min Ji

Yong-Ju Lee

Ki Tae Kim

Seung Tae Hong

Su-Jin Park

Young Sun Choi

Suk-In Noh

Jae-Wook Lee

A method for preparing a spheronized carbonaceous negative electrode active material, including the steps of: mixing microgranular scaly graphite with macrogranular scaly graphite, wherein the macrogranular scaly graphite has a larger average particle diameter than the microgranular scaly graphite, to form a mixture, and spheronizing the mixture to prepare spheronized granulated particles; carrying out carbon coating of the spheronized granulated particles; and disintegrating the carbon-coated spheronized granulated particles.

Globular carbon-based anode active material, method for manufacturing same, and anode and lithium secondary battery comprising same

A negative electrode active material, including: a graphite core; a first carbon coating layer on the graphite core; and a second carbon coating layer on the first carbon coating layer, wherein a crystallinity of the second carbon coating layer is lower than a crystallinity of the first carbon coating layer, or the second carbon coating layer includes hard carbon and the first carbon coating layer includes soft carbon. A negative electrode including the negative electrode active material and a lithium secondary battery including the same are also disclosed.

Anode active material, method for preparing anode active material, anode comprising same, and lithium secondary battery

Disclosed is a negative electrode, including: a negative electrode current collector; and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, and having a lower layer region containing a first active material and a first binder polymer, and an upper layer region disposed on the lower layer region and containing a second active material and a second binder polymer, wherein the first active material includes primary particles of artificial graphite, the second active material includes secondary particles of artificial graphite and a carbon coating layer disposed on the secondary particles, and the weight percentage (wt %) of the first binder polymer in the lower layer region is larger than the weight percentage (wt %) of the second binder polymer in the upper layer region. Also disclosed are a method for manufacturing the negative electrode and a lithium secondary battery including the negative electrode.

Negative electrode and method for manufacturing the same

The present invention relates to a cable-type secondary battery comprising a polymer electrolyte having a first electrolyte layer comprising a mixture of a first polymer and a first organic electrolyte solution in a weight ratio of 50:50 and 80:20; and a second electrolyte layer formed on at least one surface of the first electrolyte layer and comprising a mixture of a second polymer and a second organic electrolyte solution in a weight ratio of 20:80 and 50:50. Since the multiple-layered polymer electrode film of the present invention exhibits good characteristics in terms of both mechanical property and ionic conductivity, the cable-type secondary battery comprising the same according to the present invention has superior battery performances and flexibility, as well as good strength for withstanding external impact.

Cable-type secondary battery

An anode active material for a lithium secondary battery and a lithium secondary battery having the same are disclosed. The anode active material for a lithium secondary battery includes a silicon alloy consisting of silicon and at least two kinds of metals other than silicon, each having the heat of mixing with the silicon of &#x2212;23 kJ/mol or less. The anode active material for a lithium secondary battery has a high capacity, and thus, is useful in fabricating a high-capacity lithium secondary battery. Also, the anode active material for a lithium secondary battery has a small crystal size of a silicon phase and consequently a small change in volume during charging/discharging, and thus, ensures excellent cycle life characteristics in applications to batteries.

Anode active material for lithium secondary battery and lithium secondary battery having the same

The present disclosure relates to an anode active material for a lithium secondary battery, a lithium secondary battery comprising the anode active material, and a method of preparing the anode active material. One embodiment of the present disclosure provides an anode active material for a lithium secondary battery, comprising a composite of SiO-carboxylmethyl cellulose (CMC)-carbon nanotube (CNT) in which CNT is bonded to SiO(0&#x3c;x&#x2266;1) through CMC; and a carbon-based material. Also, another embodiment of the present disclosure provides a method of preparing an anode active material for a lithium secondary battery, comprising bringing SiO(0&#x3c;x&#x2266;1) into surface-treatment with carbon nanotube (CNT) and carboxylmethyl cellulose (CMC) to form a composite of SiO-CMC-CNT; and mixing the composite of SiO-CMC-CNT with a carbon-based material.

Anode active material for lithium secondary battery, lithium secondary battery comprising the same, and method of preparing the same

An anode active material for a lithium secondary battery includes a silicon alloy that includes silicon and at least one kind of metal other than silicon, the silicon alloy allowing alloying with lithium. A volume of an inactive region in the silicon alloy, which is not reacted with lithium, is 50 to 75% of the entire volume of an active material. The anode active material has a large capacity in comparison to carbon-based anode active materials, and also ensures small volume expansion and high capacity retention ratio after charging/discharging, resulting in excellent cycle characteristics.

The present invention relates to an anode for a secondary battery, comprising: a wire-type current collector; a metal-based anode active material layer formed on the surface of the wire-type current collector, and comprising a metallic active material; and a graphite-based anode composite layer formed on the surface of the metal-based anode active material layer, and comprising a mixture of a graphite-based active material, a conductive material and a first polymer binder. The anode of the present invention has the metal-based anode active material layer together with the graphite-based anode composite layer acting as a buffer, thereby preventing the metallic active material from being isolated or released even if excessive volume expansion occurs during charging and discharging processes. Also, the graphite-based anode composite layer has good affinity with an organic electrolyte solution to compensate the defect of the metallic active material having low affinity with an organic electrolyte solution.

Anode for secondary battery and secondary battery having the same

The present invention relates to an anode for a secondary battery, comprising: a spiral anode having at least two anode wires which are parallel to each other and spirally twisted, each of the anode wires having an anode active material layer coated on the surface of a wire-type current collector; and a conductive layer formed to surround the spiral anode. The anode active material layer of the spirally-twisted has a thin thickness as compared with a single strand of an anode having the same anode active material. Therefore, Li ions can be easily diffused to enhance battery performance. Also, the anode of the present invention has a conductive layer on the surface thereof to prevent or alleviate the release of an anode active material which is caused by volume expansion during charging and discharging processes, and to solve the isolation of the anode active material.

Disclosed is an anode active material including: a crystalline phase comprising Si and a Si-metal alloy; and an amorphous phase comprising Si and a Si-metal alloy, wherein the metal of the Si-metal alloy of the crystalline phase is the same as or different from the metal of the Si-metal alloy of the amorphous phase.

Growing community of inventors

Daejeon, South Korea

Dong-Sub Jung