Iljin Electric Co., Ltd.

Cheol Ho Park

Min Hyun Kim

Young Pil Choi

Seon Kyong Kim

Myeong Han Kim

Jae Woong Kim

Seung Chul Lee

Hyang Yeon Kim

Min Seok Sung

The present invention relates to a negative electrode active material for a secondary battery, including: a Si main phase formed of crystalline Si; and a matrix coexisting with the Si main phase, in which at least a part of the matrix has a crystal lattice parameter which is any one among n times, 1/n time, n&#x221a;2 times, n/&#x221a;2 times, and n&#x221a;5 times of a crystal lattice parameter of the Si main phase (n is an integer).

Negative active material for secondary battery and secondary battery including the same

Provided are a negative electrode active material for a secondary battery, which suppresses a dispersal phenomenon of a negative electrode active material during charging/discharging by controlling a lattice mismatch ratio of an amorphous matrix layer to a silicon layer in a silicon-based negative electrode active material.

Negative electrode active material for secondary battery and preparing method thereof

Provided are a negative electrode active material for a secondary battery, in which a silicon-based negative electrode active material is formed in a three-layer structure including an amorphous matrix, thereby suppressing a dispersal phenomenon of the negative electrode active material during charging/discharging. The negative electrode active material having a three-layer structure includes: a silicon (Si) layer; an amorphous matrix layer outside the Si layer; and a nano grain matrix layer formed on an interface between the Si layer and the amorphous matrix layer.

Negative electrode active material for secondary battery and secondary battery including the same

Disclosed is a continuous rapid solidification apparatus, which includes a cooling roll configured to cool a molten metal supplied to an outer circumference surface thereof; a crucible configured to supply the cooling roll with the molten metal; and two or more molten metal supplies configured to melt raw material metal and alternately supply the crucible with the molten metal.

Continuous rapid-cooling solidification apparatus

Disclosed is a continuous rapid solidification apparatus, which has a cooling roll configured to cool a molten metal supplied to an outer circumference surface thereof; a crucible configured to supply the cooling roll with the molten metal; a molten metal supply configured to melt a raw material metal and supply the crucible with the molten metal; a first chamber configured to form a sealed space where the molten metal supplied from the crucible is cooled by the cooling roll; and a second chamber configured to be formed of a space separated from the first chamber and to form a sealed space where the molten metal is supplied to the crucible by the molten metal supply.

Rapid-cooling solidification apparatus with independently controllable chamber

Disclosed is a negative active material having a reduced volume change during charge/discharge. A fine crystalline region exists on a matrix of an alloy, and lithium is easily dispersed due to the fine crystalline region. In the negative active material, a ratio of the fine crystalline region is represented by an amorphization degree, and is optimized in designing a battery through a measurement of an expansion rate after 50 cycles. The negative active material is used for a secondary battery and includes an alloy formed by a chemical formula below: (a ratio of Ti to Fe is 1:1 and a ratio of Si:Ti or Si:Fe has a range of 5:1 to 9:1.)Si&#x2014;TiFeAlwhere x, y, z, and u are at %, x: 1&#x2212;(y+z+u), y: 0.09 to 0.14, z: 0.09 to 0.14, and u: larger than 0.01 and less than 0.2.

Negative active material for secondary battery and secondary battery using the same

The present disclosure is to provide a negative electrode for a lithium secondary battery having high negative electrode efficiency and excellent capacity retention, and a lithium secondary battery including the negative electrode. In one aspect, there is provided a negative electrode for a lithium secondary battery, wherein the electrode contains 3 to 9% by weight of a silicon-based negative-electrode active material having a following composition formula (1); and 87.5 to 95.5% by weight of a graphite-based negative-electrode active material:SiTiFeAl&#x2003;&#x2003;(1)

Anode plate for lithium secondary battery, and lithium secondary battery comprising the same

A negative electrode active material for a lithium secondary battery according to an exemplary embodiment of the present invention includes an alloy containing silicon (Si), titanium (Ti), and iron (Fe), wherein the degree of amorphization of the alloy is raised by 40% or more by further adding copper (Cu) to the alloy.

Growing community of inventors

Suwon, South Korea

Cheol Ho Park