• Title/Summary/Keyword: 리튬 휘발

Search Result 7, Processing Time 0.018 seconds

Synthesis of Li-rich Cathode Material with Spherical Shape and High Crystallinity by Using Flame Spray Pyrolysis (화염분무열분해법을 이용한 구형의 고결정성 리튬 과잉 양극재 제조)

  • Sung Nam Lim
    • New & Renewable Energy
    • /
    • v.20 no.3
    • /
    • pp.20-27
    • /
    • 2024
  • A Li-rich cathode material, Li1.167Mn0.548Ni0.18Co0.105O2, with a spherical shape and high crystallinity, is prepared using flame spray pyrolysis. The post-heat treatment condition influences the properties of the prepared material, such as its structure, morphology, and chemical composition, and optimum performance is achieved at 900℃. Various excess Li contents (0-12 wt.%) are introduced in the precursor solution to compensate for volatilized Li during synthesis, bringing it close to the target composition. Compensation for volatilized Li enhances the electrochemical performance, i.e., the Li-compensated sample shows a good discharge capacity of 247 mAh g-1 at a current density of 20 mA g-1 in a potential window of 4.6-2.5 V. In addition, the prepared Li-rich cathode material supplemented with 9 wt.% of the Li source shows increased discharge capacity of 175 and 148 mAh g-1 at 200 and 400 mA g-1, respectively, compared with those of a bare sample (164 and 127 mAh g-1, respectively).

Study on the Development of Hybrid NMP Recovery System for Recovering the Used NMP in Lithium Ion Battery Cathode Manufacturing Process (리튬이온전지 양극제조 공정에서 사용된 NMP를 회수하기 위한 하이브리드형 NMP 회수시스템 개발에 관한 연구)

  • Hwang, Soon Ho;Nam, Seung Beak;Kim, Dong-Kwon;Kim, Yang Jun;Kang, Sung Eun
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.40 no.5
    • /
    • pp.289-296
    • /
    • 2016
  • The availability of NMP, a solvent used in the manufacturing process of cathode material for lithium ion battery, depends on importation, and the price remains high because of the monopoly of BASF and ISP. For these reasons, most Lithium ion battery manufacturers reuse NMP after recovering it from the exhaust air in the drying process. In Korea, absorption method is mainly used for recovering NMP from the absorption tower using the hydrophilicity of NMP. However, this system has a few disadvantages, such as low purity (80%) of the recovered NMP and 100% emission due to high water content of the treated gas. In this study, we develop a hybrid NMP recovery system by combining cooling condensation method with concentration method, by which it is possible to obtain an NMP recovery rate of 99.6%, and a high purity (96.1%) of the recovered NMP.

Characterization and Preparation of PEG-Polyimide Copolymer Asymmetric Flat Sheet Membranes for Carbon Dioxide Separation (이산화탄소 분리를 위한 폴리에틸렌글리콜계 폴리이미드 공중합체 비대칭 평판형 분리막의 제조 및 기체 투과 특성평가)

  • Park, Jeong Ho;Kim, Deuk Ju;Nam, Sang Yong
    • Membrane Journal
    • /
    • v.25 no.6
    • /
    • pp.547-557
    • /
    • 2015
  • In this study, we synthesized polyimide with high carbon dioxide gas transport property using 2,2-bis(3,4-carboxylphenyl) hexafluoropropane, 2,3,5,6-tetramethyl-1,4-phenylenediamine and poly(ethylene glycol) bis(3-aminopropyl) terminated and then we calculated solubility parameter of synthesized polymer and non-solvent phase separation coefficient to determine proper solvent for preparation of asymmetric membrane, also we measured the viscosity of the polymer solution to check polymer contents in membrane solution and prepare asymmetric membrane with $LiNO_3$ additives. The morphology and gas separation property of membrane prepared by phase separation method was confirmed using Field Emission Scanning Electron Microsope and the single gas permeation measurement apparatus. We confirmed that the carbon dioxide permeance of the membrane increased and the selectivity showed little change with decreasing of the volatile solvent contents.

Design of Non-Flammable Electrolytes for Highly Safe Lithium-Ion Battery (리튬 이온전지의 안전성을 구현하기 위한 난연성 전해액의 설계)

  • Choi, Nam-Soon;Kim, Sung-Soo;Narukawa, Satoshi;Shin, Soon-Cheol;Cha, Eun-Hee
    • Journal of the Korean Electrochemical Society
    • /
    • v.12 no.3
    • /
    • pp.203-218
    • /
    • 2009
  • The development of lithium-ion battery (LIB) technologies and their application in the field of large-scale power sources, such as electric vehicles (EVs), hybrid EVs, and plug-in EVs require enhanced reliability and superior safety. The main components of LIBs should withstand to the inevitable heating of batteries during high current flow. Carbonate solvents that contribute to the dissociation of lithium salts are volatile and potentially combustible and can lead to the thermal runaway of batteries at any abuse conditions. Recently, an interest in nonflammable materials is greatly growing as a means for improving battery safety. In this review paper, novel approaches are described for designing highly safe electrolytes in detail. Non-flammability of liquid electrolytes and battery safety can be achieved by replacing flammable organic solvents with thermally resistive materials such as flame-retardants, fluorinated organic solvents, and ionic liquids.

Recent Progress and Perspectives of Solid Electrolytes for Lithium Rechargeable Batteries (리튬이차전지용 고체 전해질의 최근 진전과 전망)

  • Kim, Jumi;Oh, Jimin;Kim, Ju Young;Lee, Young-Gi;Kim, Kwang Man
    • Journal of the Korean Electrochemical Society
    • /
    • v.22 no.3
    • /
    • pp.87-103
    • /
    • 2019
  • Nonaqueous organic electrolyte solution in commercially available lithium-ion batteries, due to its flammability, corrosiveness, high volatility, and thermal instability, is demanding to be substituted by safer solid electrolyte with higher cycle stability, which will be utilized effectively in large-scale power sources such as electric vehicles and energy storage system. Of various types of solid electrolytes, composite solid electrolytes with polymer matrix and active inorganic fillers are now most promising in achieving higher ionic conductivity and excellent interface contact. In this review, some kinds and brief history of solid electrolyte are at first introduced and consequent explanations of polymer solid electrolytes and inorganic solid electrolytes (including active and inactive fillers) are comprehensively carried out. Composite solid electrolytes including these polymer and inorganic materials are also described with their electrochemical properties in terms of filler shapes, such as particle (0D), fiber (1D), plane (2D), and solid body (3D). In particular, in all-solid-state lithium batteries using lithium metal anode, the interface characteristics are discussed in terms of cathode-electrolyte interface, anode-electrolyte interface, and interparticle interface. Finally, current requisites and future perspectives for the composite solid electrolytes are suggested by help of some decent reviews recently reported.

Study on uranium metalization yield of spent pressurized water reactor fuels and oxidation behavior of fission products in uranium metals (사용후핵연료의 우라늄 금속 전환율 측정 및 전환체 내 핵분열생성물의 산화거동 연구)

  • Choi, Ke Chon;Lee, Chang Heon;Kim, Won Ho
    • Analytical Science and Technology
    • /
    • v.16 no.6
    • /
    • pp.431-437
    • /
    • 2003
  • Metalization yield of uranium oxide to uranium metal from lithium reduction process of spent pressurized water reactor (PWR) fuels was measured using thermogravimetric analyzer. A reduced metal produced in the process was divided into a solid and a powder part, and each metalization yield was measured. Metalization yield of the solid part was 90.7~95.9 wt%, and the powder being 77.8~71.5 wt% individually. Oxidation behaviour of the quartemary alloy was investigated to take data on the thermal oxidation stability necessary for the study on dry storage of the reduced metal. At $600{\sim}700^{\circ}C$, weight increments of alloy of Mo, Ru, Rh and Pd was 0.40~0.55 wt%. Phase change on the surface of the alloy was started at $750^{\circ}C$. In particular, Mo was rapidly oxidized and then the alloy lost 0.76~25.22 wt% in weight.

Electrochemical Characterization and Mechanical Properties of PEO-like Solid Polymer Electrolyte Based on Bisphenol A Ethoxylate Diacrylate (Bisphenol A ethoxylate diacrylate를 가교제로 사용한 PEO계 고분자 전해질의 전기화학적 특성 및 물성)

  • Kim, Seok-Koo;Kang, Yong-Ku;Rhee, Hee-Woo;Lee, Chang-Jin
    • Polymer(Korea)
    • /
    • v.25 no.4
    • /
    • pp.568-574
    • /
    • 2001
  • PEO-like solid polymer electrolytes based on bisphenol A ethoxylate acrylate were synthesized and their electrochemical properties and mechanical stability were studied. Low molecular weight poly(ethylene glycol) dimethyl ether (PEGDMe) was added to increase the conductivity of the electrolyte. The maximum conductivity of the resulting polymer electrolyte was found to be 1.0 ${\times}$ 10$^{-3}$ S/cm [Bisphenol A ethoxylate diacrylate ([EO]/[phenol]= 15), PEGDMe250 80 wt%, LiCF$_3SO_3$] at 30$^{\circ}$C. Tensile strength of the free standing polymer electrolyte films was measured to be in the range of 0.4 ~ 5 MPa and these polymer electrolyte films did not show a crack even in 90$^{\circ}$ and 180$^{\circ}$ bending against ${\phi}$=3 mm bar. These electrolytes showed oxidation stability up to 4.5 V vs. lithium reference electrode.

  • PDF