Korea Institute of Industrial Technology

Tdl Co., Ltd.

Duck Rye Chang

Ho Sung Kim

Tae Won Kim

Kyeong Wan Kim

Jong Ho Lee

Min Young Kim

Seung Hoon Yang

Min-Young Kim

Jinsub Lim

Chae Hwan Jeong

Ik Hyun Oh

Seong Jae Boo

Sun Woo Yang

Ju Hee Kang

Seung Woo Choi

Kyeong Joon Kim

Da-Hye Kim

Sung Hee Park

The method for manufacturing a solid electrolyte using an LLZ material for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO).6HO] and zirconium nitrate [ZrO(NO).6HO] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH.H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.

Solid electrolyte for all solid-state lithium-ion battery and manufacturing method therefor

The present invention relates to an all-solid-state lithium secondary battery and a method of manufacturing the same. The all-solid-state lithium secondary battery includes a cathode, an anode, and a composite solid electrolyte layer between the cathode and the anode, wherein first and second LLZOs contained respectively in the cathode and the composite solid electrolyte layer are each independently aluminum-doped or undoped LLZO, and the battery of the invention can exhibit improved discharge capacity and cycle characteristics because both the cathode and the composite solid electrolyte layer contain a conductive polymer, a lithium salt and an inorganic ceramic solid electrolyte. The method of the invention enables the all-solid-state lithium secondary battery to be manufactured in a non-sintering manner, thus reducing manufacturing costs and controlling interfacial reactions between active materials, between solid electrolyte particles, and between an electrolyte and an electrode, thereby further reducing the internal resistance of the battery.

All-solid-state lithium secondary battery containing LLZO solid electrolyte and method for preparing same

Disclosed is a method of preparing a solid electrolyte, which includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution including a metal precursor solution, containing a lanthanum precursor, a zirconium precursor and an aluminum precursor, a complexing agent, and a pH controller to coprecipitation, (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry, (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source, and (d) preparing an aluminum-doped lithium lanthanum zirconium oxide (LLZO) solid electrolyte by calcining the mixture, and which is also capable of adjusting the aluminum content of a starting material to thus control sintering properties and of adjusting the composition of a precursor and a lithium source to thus control the crystal structure, thereby improving the ionic conductivity of the solid electrolyte.

Method for preparing solid electrolyte for all-solid-state lithium secondary battery

This disclosure synthesizes an anodic composite material Li(LiNiCoMnO) of LiMnOseries whose theoretical capacity is a level of about 460 mAh/g, and to produce an electrode of a high capacity using the synthesized anodic composite material. Also provided is a method for charging and discharging the electrode. Here, the method for producing an anodic composite material for a lithium secondary battery includes the steps of: mixing a nickel nitrate solution, a manganese nitrate solution, and a cobalt nitrate solution to produce a starting material solution; and mixing the starting material solution with a complexing agent so as to produce an anodic composite material Li(LiNiCoMnO) of LiMnOseries by means of coprecipitation.

Method for producing anodic composite material for lithium secondary battery, method for producing electrode using same, and method for charging and discharging electrode

The present invention relates to the manufacture of a high capacity electrode by synthesizing an excellent LiMnO-based composite material Li(LiNiCoMnO) to improve the characteristics of an inactive LiMnOmaterial with a specific capacity of about 460 mAh/g. Here, a manufacturing method of a cathode material for a lithium secondary battery uses a LiMnO-based composite material Li(LiNiCoMnO) by reacting a starting material wherein a nickel nitrate solution, a manganese nitrate solution and a cobalt nitrate solution are mixed, with a complex agent by co-precipitation.

Cathode composite material synthesis having high energy density for lithium secondary battery for electric vehicle and electrode manufacturing technology thereof

Growing community of inventors

Gwangju, South Korea

Duck Rye Chang