Lg Chem, Ltd

Jae Seung Oh

Byoung Bae Lee

Jae Duk Park

Shin Jung Choi

Yeon Suk Hong

You Jin Shim

Ji Won Park

Won Jong Kwon

Hyo Jin Lee

Su Jin Mun

Jin Young Park

Ki Seok Jang

Byoung-Bae Lee

Sang Ho Kim

Min Ah Kim

Jiwon Park

Jaeduk Park

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are provided. The non-aqueous electrolyte solution includes an organic solvent, an ionizable lithium salt, a dinitrile compound including an ether bond represented by Chemical Formula 1, and an aliphatic dinitrile compound represented by Chemical Formula 2. The lithium secondary battery including the non-aqueous electrolyte solution having the possibility of generating a swelling phenomenon while storing or charging/discharging at a high temperature may be restrained. In addition, a cycle life of the charging/discharging may be improved.

Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

A lithium secondary battery comprising a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode and a non-aqueous electrolyte is provided. The positive electrode comprises a first positive electrode active material represented by following Chemical Formula 1. And the non-aqueous electrolyte comprises a first lithium salt, a second lithium salt represented by following Chemical Formula 2 and a non-aqueous organic solvent.LiMO&#x2003;&#x2003;[Chemical Formula 1]LiRCOO&#x2003;&#x2003;[Chemical Formula 2] (In Chemical Formulae 1 and 2, M=NiMnCo, in which 0&#x3c;a&#x3c;2, 0&#x3c;b&#x3c;2, 0&#x3c;c&#x3c;2, a+b+c=1 or 2, 0.5&#x2266;x&#x2266;1.3, 1&#x3c;x+y&#x2266;3.3, 2&#x2266;z&#x2266;4, and R is independently a C-Calkyl group, a C-Caryl group, a C-Calkenyl group, a halogen substituted C-Calkyl group, a halogen substituted C-Caryl group or a halogen substituted C-Calkenyl group).

Lithium secondary battery

A secondary battery comprising a cathode, an anode, a separator and an electrolyte that comprises a eutectic mixture formed of: an amide group-containing compound, and an ionizable lithium salt. The anode comprises a metal or metal oxide having a potential vs. lithium potential (Li/Li) within electrochemical window of the eutectic mixture. Because the secondary battery uses a eutectic mixture as an electrolyte in combination with an anode having a potential vs. lithium potential (Li/Li) within the electrochemical window of the eutectic mixture, problems such as decomposition of an electrolyte and degradation of the quality of a battery are avoided. Also, due to the thermal and chemical stability, high conductivity and a broad electrochemical window of a eutectic mixture, it is possible to improve the quality as well as safety of a battery.

Secondary battery comprising eutectic mixture and preparation method thereof

A non-aqueous electrolyte solution includes an electrolyte solution including an amide compound and a lithium salt, and a dinitrile compound substituted by a hetero atom at a main chain, and a lithium secondary battery includes the non-aqueous electrolyte solution. By using the non-aqueous electrolyte solution, a lithium secondary battery having an improved swelling phenomenon and an increased charging/discharging performance may be provided.

Disclosed is an electrolyte comprising a eutectic mixture formed of: (a) an amide group-containing compound; and (b) a lithum-free ionizable salt. An electrochemical device comprising the electrolyte is also disclosed. The electrolyte improves the quality of and electrochemical device due to the excellent conductivity of the metal cation contained in the eutectic mixture, a broad electrochemical window and low viscosity. Additionally, since the eutectic mixture has excellent thermal and chemical stability, it is possible to solve the problems of evaporation, exhaustion and ignition of electrolytes, to minimize side reactions between constitutional elements of the device and the electrolyte, and to improve the safety of the electrochemical device.

Electrolyte comprising eutectic mixture and electrochemical device using the same

Disclosed is a secondary battery including a cathode, an anode, a separator, and an electrolyte, wherein the electrolyte includes a ternary eutectic mixture prepared by adding (c) a carbonate-based compound to a eutectic mixture containing (a) an amide group-containing compound and (b) an ionizable lithium salt, and the carbonate-based compound is included in an amount of less than 50 parts by weight based on 100 parts by weight of the electrolyte. The use of the disclosed ternary eutectic mixture having flame resistance, chemical stability, high conductivity, and a broad electrochemical window, as the electrolyte material, improves both the thermal stability and quality of the battery.

Secondary battery comprising ternary eutectic mixtures and preparation method thereof

Disclosed is an electrolyte for electrochromic devices, which includes a eutectic mixture comprising: (a) a compound having an acidic functional group and basic functional group; and (b) an ionizable lithium salt. An electrochromic device using the same electrolyte is also disclosed. Because the electrochromic device uses the electrolyte comprising the eutectic mixture, which is cost-efficient and has excellent thermal and chemical stability, there are no problems related with evaporation and exhaustion as well as flammability of electrolyte. Additionally, it is possible to minimize side reactions with constitutional elements of an electrochromic device and electrolyte, thereby improving the safety. Further, it is also possible to improve the quality of an electrochromic device by virtue of a broad electrochemical window and high electroconductivity of the eutectic mixture.

Electrolyte comprising eutectic mixture and electrochromic device using the same

The present invention provides A method for preparing an electrode containing lithium nickel oxide wherein nickel has a single oxidation number, which comprises the following steps: a) preparing an electrode containing the lithium nickel oxide (LiNiO, 0.4&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1) layer formed on the conductive substrate; and b) applying oxidative voltage to the electrode, and then applying reductive voltage thereto, an electrode prepared by the method and an electrochromic device containing the same. The electrode containing the lithium nickel oxide layer of the present invention exhibits wider optical electrochromic range and fast reaction speed, so that it can contribute to improving electrochromism and other optical properties of an electrochromic device.

Electrode comprising lithium nickel oxide layer, method for preparing the same, and electrochromic device comprising the same

Disclosed is an electrochromic device comprising: (a) a first electrode; (b) a second electrode; (c) an electrochromic material; and (d) a gel polymer electrolyte containing an ionic liquid. A method for manufacturing the same is also disclosed. The electrochromic device uses a gel polymer electrolyte comprising an ionic liquid. Therefore, there is no problem related with electrolyte leakage. Additionally, it is possible to manufacture electrochromic devices by using plastic materials, because the ionic liquid gel polymer electrolyte permits structural deformation with ease. Further, because the electrochromic device uses an ionic liquid, it is possible to minimize side reactions between constitutional elements of an electrochromic device and electrolyte.

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Seoul, South Korea

Jae Seung Oh