公开(公告)号：US09643846B2

公开(公告)日：2017-05-09

申请号：US13944457

申请日：2013-07-17

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyung Sun Kim ,  Byung Won Cho ,  Hwa Young Lee ,  Eun Jung Shin ,  Soo Kim ,  Kyung Yoon Chung

IPC: H01M4/88 ,  C01B25/45 ,  C01B25/37 ,  H01M10/54 ,  H01M4/58

CPC classification number: C01B25/45 ,  C01B25/375 ,  H01M4/5825 ,  H01M10/54 ,  Y02W30/84

Abstract: The present invention relates to a method for recycling LiFePO4, which is an olivine-based cathode material for a lithium secondary battery. The present invention is characterized in that a cathode material including LiFePO4 is synthesized using, as precursors, amorphous FePO4.XH2O and crystalline FePO4.2H2O (metastrengite) obtained by chemically treating LiFePO4 as an olivine-based cathode material for a lithium secondary battery, which is produced from a waste battery. Since a cathode fabricated from the LiFePO4 cathode material synthesized according to the present invention does not deteriorate the capacity, output characteristics, cycle efficiency and performance of the secondary battery and the cathode material of the lithium secondary battery may be recycled, the secondary battery is economically efficient.

公开(公告)号：US08900543B2

公开(公告)日：2014-12-02

申请号：US13922380

申请日：2013-06-20

Applicant: Korea Institute of Science and Technology ,  Recytec. Inc.

Inventor： Hwa Young Lee ,  Joong Kee Lee ,  Jae Gyu Jee ,  Joon Chul Choi

IPC: C01B19/00

CPC classification number: C01B19/001 ,  C01B19/00 ,  Y02P20/129

Abstract: A method for separating tellurium includes separating and recovering tellurium (Te) from a dissolved solution containing the tellurium using a solvent extraction by an extractant, which contains one selected from a group consisting of tributyl phosphate (TBP), tris(2-ethylhexyl) phosphate (TEHP) and a combination thereof. The method may separate and recover the tellurium as a high-priced metallic element from a material, such as a Bi2Te3-based waste thermoelectric material, which contains not only the tellurium but also other metallic elements, simply and economically using a solvent extraction, whereby the tellurium with high yield and high purity can be separated, recovered and recycled.

Abstract translation: 用于分离碲的方法包括使用萃取剂的溶剂萃取从含有碲的溶解溶液中分离和回收碲（Te），所述萃取剂含有选自磷酸三丁酯（TBP），磷酸三（2-乙基己基）酯 （TEHP）及其组合。 该方法可以从诸如基于Bi2Te3的废热电材料的材料中分离和回收作为高价金属元素的碲，其不仅包含碲而且还包含其它金属元素，简单且经济地使用溶剂萃取，由此 具有高产率和高纯度的碲可以分离，回收和再循环。

公开(公告)号：US08778288B1

公开(公告)日：2014-07-15

申请号：US13852143

申请日：2013-03-28

Applicant: Korea Institute of Science and Technology ,  Posco M-Tech

Inventor： Hwa Young Lee ,  Byung Won Cho ,  Joong Kee Lee

IPC: B01D11/00

CPC classification number: C22B3/0005 ,  Y02P10/234

Abstract: A separation method of zirconium and hafnium is described which includes an extraction process of agitating an undiluted aqueous solution containing zirconium, hafnium, and sulfuric acid with a first stirring solution containing an acidic extractant to produce a first extract solution in which the hafnium is extracted by the acidic extractant; and a recovery process of agitating the first extract solution with a second stirring solution containing a citric acid solution to produce a citric acid solution after extraction in which zirconium is reverse-extracted from the first extract solution to the citric acid solution so as to recover zirconium contained in the first extract solution. The method may reduce the amount of extractant while greatly enhancing the separation effect of zirconium and hafnium, and increase zirconium recovery rate by more than 97% through an additional zirconium recovery process while reducing a hafnium content in zirconium by less than 50 ppm.

Abstract translation: 描述了锆和铪的分离方法，其包括使用含有酸性萃取剂的第一搅拌溶液搅拌未稀释的含有锆，铪和硫酸的水溶液的提取方法，以产生其中铪被提取的第一提取溶液 酸性提取剂; 以及回收方法，用含有柠檬酸溶液的第二搅拌溶液搅拌第一提取溶液，以在提取后产生柠檬酸溶液，其中将锆从第一提取溶液反萃取至柠檬酸溶液，以回收锆 包含在第一提取物溶液中。 该方法可以减少萃取剂的量，同时大大提高锆和铪的分离效果，并且通过另外的锆回收方法将锆回收率提高97％以上，同时将锆中的铪含量降低到低于50ppm。

公开(公告)号：US08801916B2

公开(公告)日：2014-08-12

申请号：US13670869

申请日：2012-11-07

Applicant: Korea Institute of Science and Technology

Inventor： Hwa Young Lee ,  Byung Won Cho ,  Joong Kee Lee

IPC: C25C1/08 ,  C25C3/34 ,  C25C7/00

CPC classification number: C25C1/08 ,  C23C18/1617 ,  C23C18/32

Abstract: A recovery method of nickel according to the present invention comprises pretreatment step to prepare a solution for electrolysis by adding hexanesulfonate salt to a treatment solution including nickel, and nickel recovery step to recover nickel in a metal form by electrolysis of the above solution for electrolysis. The present invention can produce nickel in high purity with simple process with low cost, and can recover and reproduce nickel in a metal form with at least 99.5% of high purity and at least 90% of recovery rate.

Abstract translation: 根据本发明的镍的回收方法包括预处理步骤，通过向包含镍的处理溶液中加入己磺酸盐制备电解溶液，以及镍回收步骤，通过电解上述电解溶液来回收金属形式的镍。 本发明可以以低成本的简单工艺生产高纯度的镍，并且可以以至少99.5％的高纯度和至少90％的回收率回收和再现金属形式的镍。

公开(公告)号：US09199850B2

公开(公告)日：2015-12-01

申请号：US13651765

申请日：2012-10-15

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyung Sun Kim ,  Byung Won Cho ,  Hwa Young Lee ,  Su Jin Kim ,  Eun Jung Shin ,  Kyung Yoon Chung

IPC: C01B25/00 ,  C01B25/37 ,  C01B25/45 ,  H01M4/1397 ,  H01M4/58 ,  H01B1/12 ,  H01M4/02 ,  H01M4/04 ,  H01M4/62

CPC classification number: C01B25/375 ,  C01B25/45 ,  H01M4/0471 ,  H01M4/1397 ,  H01M4/5825 ,  H01M4/625 ,  Y02E60/122

Abstract: The present invention relates to a method for fabricating a LiFePO4 cathode electroactive material for a lithium secondary battery by recycling, and a LiFePO4 cathode electroactive material for a lithium secondary battery, a LiFePO4 cathode, and a lithium secondary battery fabricated thereby. The present invention is characterized in that a cathode scrap is heat treated in air for a cathode electroactive material to be easily dissolved in an acidic solution, and amorphous FePO4 obtained as precipitate is heat treated in an atmosphere of air or hydrogen so as to fabricate crystalline FePO4 or Fe2P2O7. According to the present invention, a cathode scrap may be recycled by using a simple, environmentally friendly, and economical method. Further, a lithium secondary battery fabricated by using a LiFePO4 cathode electroactive material from the cathode scrap is not limited in terms of performance.

Abstract translation: 本发明涉及通过再循环制造用于锂二次电池的LiFePO 4阴极电活性材料的方法，以及用于锂二次电池的LiFePO 4阴极电活性材料，LiFePO 4阴极和由此制造的锂二次电池。 本发明的特征在于，阴极废料在空气中进行热处理，以使阴极电活性物质容易地溶解在酸性溶液中，并将作为沉淀物获得的无定形FePO 4在空气或氢气气氛中进行热处理，以制造结晶 FePO4或Fe2P2O7。 根据本发明，阴极废料可以通过简单，环保且经济的方法再循环。 此外，通过使用来自阴极废料的LiFePO 4阴极电活性材料制造的锂二次电池在性能方面没有限制。

公开(公告)号：US08557202B1

公开(公告)日：2013-10-15

申请号：US13667404

申请日：2012-11-02

Applicant: Korea Institute of Science and Technology

Inventor： Hwa Young Lee ,  Byung Won Cho ,  Joong Kee Lee

IPC: C22B34/00

CPC classification number: C22B3/0063 ,  C22B34/14 ,  Y02P10/234

Abstract: A separation method of zirconium and hafnium according to an example of the present invention comprising, mixing step to prepare a crude liquid for extraction, by mixing a sulfuric acid solution including zirconium and hafnium, a catalyst, and an acidic extractant; and first extraction step to form a first extract solution layer comprising the acidic extractant in which the hafnium has been extracted and a sulfuric acid solution layer separated from the first extract solution layer, wherein the acidic extractant comprises any one selected from a group consisting of D2EHPA (Di-(2-ethylhexyl)phosphoric acid), PC88A (2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester), and a combination thereof. The separation method not only saves the amount of extractant used but also increases separation effect of zirconium and hafnium known to be difficult for separating each other, without using no toxic compound such as cyan.

Abstract translation: 根据本发明实施例的锆和铪的分离方法，包括：混合步骤，通过混合包含锆和铪的硫酸溶液，催化剂和酸性萃取剂来制备用于萃取的粗液体; 以及第一提取步骤，形成包含其中提取了铪的酸性萃取剂和从第一提取液层分离的硫酸溶液层的第一萃取溶液层，其中酸性萃取剂包含选自D2EHPA （2-（2-乙基己基）磷酸），PC88A（2-乙基己基膦酸单-2-乙基己基酯）及其组合。 分离方法不仅节省了使用的萃取剂的量，而且增加了已知难以分离的锆和铪的分离效果，而不使用无毒化合物如青色。