• 제목/요약/키워드: Li

검색결과 18,162건 처리시간 0.047초

가스흡수식 냉방기용 4성분계 작동매체의 물성 향상 연구 (A Study on Improvement of the Physical Properties of 4 Component Working Fluid in Gas Fired Absorption Chillers)

  • 백영순;오영삼;이용원;박달령;구기갑
    • 공업화학
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    • 제10권3호
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    • pp.400-406
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    • 1999
  • 고효율 가스흡수식 냉방기를 위한 신 작동매체로 기존의 $LiBr-H_2O$ 용액에 $LiNO_3$, LiCl, LiI 성분을 첨가하여 4성분 용액을 제조하였다. 본 연구를 통하여 제조된 4성분계의 작동매체에 대한 용해도와 증기압을 측정하여 기존의 $LiBr-H_2O$계와 비교 분석하였으며, 이들에 대한 최적혼합 몰비를 각각 구하였다. 용해도 측면에서 $LiBr-LiNO_3-LiCl$계는 5:1:1~2, $LiBr-LiNO_3-LiCl$계는 5:1:1, LiBr-LiI-LiCl계의 경우 5:1:0.5~1로 나타났다. 한편 $LiBr-LiNO_3-LiCl-H_2O$계를 제외하고 모두 증기압이 $LiBr-H_2O$계에 비해 높게 나타났다. $LiBr-LiNO_3-LiCl-H_2O$계를 이용한 흡수성능 실험시 $LiBr-H_2O$계 보다 우수한 특성을 지녔다.

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Pt/LiCoO2/LiPON/Cu와 Pt/LiCoO2/LiPON/LiCoO2/Cu 구조를 갖는 Li-free 박막전지 (Li-free Thin-Film Batteries with Structural Configuration of Pt/LiCoO2/LiPON/Cu and Pt/LiCoO2/LiPON/LiCoO2/Cu)

  • 신민선;김태연;이성만
    • 한국표면공학회지
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    • 제51권4호
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    • pp.243-248
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    • 2018
  • All solid state thin film batteries with two types of cell structure, Pt / $LiCoO_2$ / LiPON / Cu and Pt / $LiCoO_2$ / LiPON / $LiCoO_2$ / Cu, are prepared and their electrochemical performances are investigated to evaluate the effect of $LiCoO_2$ interlayer at the interface of LiPON / Cu. The crystallinity of the deposited $LiCoO_2$ thin films is confirmed by XRD and Raman analysis. The crystalline $LiCoO_2$ cathode thin film is obtained and $LiCoO_2$ as the interlayer appears to be amorphous. The surface morphology of Cu current collector after cycling of the batteries is observed by AFM. The presence of a 10 nm-thick layer of $LiCoO_2$ at the interface of LiPON / Cu enhances the interfacial adhesion and reduces the interfacial resistance. As a result, Li plating / stripping at the interface of LiPON / Cu during charge/discharge reaction takes place more uniformly on Cu current collector, while without the interlayer of $LiCoO_2$ at the interface of LiPON / Cu, the Li plating / stripping is localized on current collector. The thin film batteries with the interlayer of $LiCoO_2$ at the interface of LiPON / Cu exhibits enhanced initial coulombic efficiency, reversible capacity and cycling stability. The thickness of the anode current collector Cu also appears to be crucial for electrochemical performances of all solid state thin film batteries.

LiFePO4와 Li4P2O77Li MAS NMR 특성 연구 (7Li MAS NMR studies of Li4P2O7 and LiFePO4 materials)

  • 한덕영;박남신;이상혁;이학만;김창삼
    • 한국결정성장학회지
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    • 제21권1호
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    • pp.15-20
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    • 2011
  • [ $^7Li$ ]Magic Angle Spinning(MAS) NMR Spectroscopy를 활용하여 $Li_4P_2O_7$$LiFePO_4$ 물질에서 $^7Li$ 핵의 NMR 특성 및 화합물 분자내의 국부적 구조 연구를 수행하였다. $Li_4P_2O_7$$LiFePO_4$ 물질 연구는 리튬이온전지에서 고체-전해질 경계상(SEI, solid-electrolyte interphase) 물질 연구를 위한 것이다. $Li_4P_2O_7$$LiFePO_4$ 분말은 고상합성법으로 제조하였다.$^7Li$MAS NMR 실험은 $27^{\circ}C$에서 $97^{\circ}C$의 영역에서 변온 실험을 수행하였으며 이는 주변 온도 변화 환경에서 $Li_4P_2O_7$ 물질 내의 Li 핵의 구조 변화를 관찰하기 위한 것이다. $^7Li$ MAS NMR 측정 결과 시료 온도가 $27^{\circ}C$에서 $97^{\circ}C$의 온도 분포 영역에서는 $Li_4P_2O_7$ 물질 내부의 Li 핵은 구조적으로 변화하지 않는 것이 확인되었다. 금번 실험을 통하여 $LiFePO_4$ 분말에 5.0 wt%이내로 포함되어있는 $Li_4P_2O_7$ 물질의 $^7Li$ MAS NMR 신호를 측정할 수 있는 측정 조건을 알았다.

Design and Implementation of System for Estimating Diameter at Breast Height and Tree Height using LiDAR point cloud data

  • Jong-Su, Yim;Dong-Hyeon, Kim;Chi-Ung, Ko;Dong-Geun, Kim;Hyung-Ju, Cho
    • 한국컴퓨터정보학회논문지
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    • 제28권2호
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    • pp.99-110
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    • 2023
  • 논문은 LiDAR 점군 데이터를 사용하여 흉고 직경과 수고를 예측하는 ForestLi 시스템을 제안한다. ForestLi 시스템이 LiDAR 점군 데이터를 처리하는 과정은 다음과 같이 여러 단계로 진행된다. 다운샘플링, 이상점 제거, 지표면 분할, 지표면 정규화, 수간 추출, 개체목 분할, 흉고 직경 측정, 수고 측정. LiDAR 점군 데이터를 처리하는 상용 시스템 LiDAR360은 하측 식생과 개체목 분할 오류를 사용자가 직접 수정해야 한다. ForestLi 시스템은 하측 식생에 해당하는 LiDAR 점군 데이터를 자동으로 제거한다. 결과적으로 ForestLi 시스템이 LiDAR360보다 전체 수행시간을 줄이고, 흉고 직경과 수고 예측의 정확성을 높였다. 실험을 통해서 제안된 ForestLi가 LiDAR360 시스템보다 흉고 직경과 수고 측정의 정확성과 전체 실행시간 측면에서 우수하다는 것을 보여주었다.

수양명경근(手陽明經筋)의 해부학적(解剖學的) 고찰(考察) (Anatomy of Large Intestine Meridian Muscle in human)

  • 심영;박경식;이준무
    • Korean Journal of Acupuncture
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    • 제19권1호
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    • pp.15-23
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    • 2002
  • This study was carried to identify the component of Large Intestine Meridian Muscle in human, dividing into outer, middle, and inner part. Brachium and antebrachium were opened widely to demonstrate muscles, nerve, blood vessels and the others, displaying the inner structure of Large Intestine Meridian Muscle. We obtained the results as follows; 1. Meridian Muscle is composed of the muscle, nerve and blood vessels. 2. In human anatomy, it is present the difference between a term of nerve or blood vessels which control the muscle of Meridian Muscle and those which pass near by Meridian Muscle. 3. The inner composition of meridian muscle in human arm is as follows. 1) Muscle; extensor digitorum tendon(LI-1), lumbrical tendon(LI-2), 1st dosal interosseous muscle(LI-3), 1st dosal interosseous muscle and adductor pollicis muscle(LI-4), extensor pollicis longus tendon and extensor pollicis brevis tendon(LI-5), adductor pollicis longus muscle and extensor carpi radialis brevis tendon(LI-6), extensor digitorum muscle and extensor carpi radialis brevis mucsle and abductor pollicis longus muscle(LI-7), extensor carpi radialis brevis muscle and pronator teres muscle(LI-8), extensor carpi radialis brevis muscle and supinator muscle(LI-9), extensor carpi radialis longus muscle and extensor carpi radialis brevis muscle and supinator muscle(LI-10), brachioradialis muscle(LI-11), triceps brachii muscle and brachioradialis muscle(LI-12), brachioradialis muscle and brachialis muscle(LI-13), deltoid muscle(LI-14, LI-15), trapezius muscle and supraspinous muscle(LI-16), platysma muscle and sternocleidomastoid muscle and scalenous muscle(LI-17, LI-18), orbicularis oris superior muscle(LI-19, LI-20) 2) Nerve; superficial branch of radial nerve and branch of median nerve(LI-1, LI-2, LI-3), superficial branch of radial nerve and branch of median nerve and branch of ulna nerve(LI-4), superficial branch of radial nerve(LI-5), branch of radial nerve(LI-6), posterior antebrachial cutaneous nerve and branch of radial nerve(LI-7), posterior antebrachial cutaneous nerve(LI-8), posterior antebrachial cutaneous nerve and radial nerve(LI-9, LI-12), lateral antebrachial cutaneous nerve and deep branch of radial nerve(LI-10), radial nerve(LI-11), lateral antebrachial cutaneous nerve and branch of radial nerve(LI-13), superior lateral cutaneous nerve and axillary nerve(LI-14), 1st thoracic nerve and suprascapular nerve and axillary nerve(LI-15), dosal rami of C4 and 1st thoracic nerve and suprascapular nerve(LI-16), transverse cervical nerve and supraclavicular nerve and phrenic nerve(LI-17), transverse cervical nerve and 2nd, 3rd cervical nerve and accessory nerve(LI-18), infraorbital nerve(LI-19), facial nerve and infraorbital nerve(LI-20). 3) Blood vessels; proper palmar digital artery(LI-1, LI-2), dorsal metacarpal artery and common palmar digital artery(LI-3), dorsal metacarpal artery and common palmar digital artery and branch of deep palmar aterial arch(LI-4), radial artery(LI-5), branch of posterior interosseous artery(LI-6, LI-7), radial recurrent artery(LI-11), cephalic vein and radial collateral artery(LI-13), cephalic vein and posterior circumflex humeral artery(LI-14), thoracoacromial artery and suprascapular artery and posterior circumflex humeral artery and anterior circumflex humeral artery(LI-15), transverse cervical artery and suprascapular artery(LI-16), transverse cervical artery(LI-17), SCM branch of external carotid artery(LI-18), facial artery(LI-19, LI-20)

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Charge/Discharge Properties of Camon Added $LiFeO_4$

  • Jin, En-Mei;Li, Hu;Jeon, Yeon-Su;Park, Kyung-Hee;Gu, Hal-Bon
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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    • pp.361-362
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    • 2007
  • Phospho-olivine $LiFePO_4$ cathode materials were prepared by hydrothermal reaction. Carbon black was added to enhance the electrical conductivity of $LiFePO_4$. The structural and morphological performance of $LiFePO_4$ and $LiFePO_4$-C powders were characterized by X-ray diffraction (XRD) and FE-SEM. $LiFePO_4/SPE/Li$ and $LiFePO_4$-C/SPE/Li cells were characterized electrochemically by charge/discharge experiments. The results showed that the discharge capacity of $LiFePO_4$-C/SPE/Li cell was 103 mAh/g at the first cycle. The discharge capacity of $LiFePO_4$-C/SPE/Li cell with 5 wt% carbon black was the largest among $LiFePO_4$-C/SPE/Li cells, 126 mAh/g at the first cycle and 123 mAh/g after 30 cycles, respectively. It was demonstrated that cycling performance of $LiFePO_4$-C/SPE/Li cell with 5 wt% carbon black was better than that of $LiFePO_4$/SPE/Li cell.

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Li 치환된 $Li[Li_yMn_{2-y}]O_4$ 정극 활물질의 결정 구조와 충방전 용량과의 관계 (The relation of the crystal phase and the charge/discharge capacity of $Li[Li_yMn_{2-y}]O_4$ cathode materials substituted Li)

  • 정인성;구할본;박복기;손명모;이헌수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 춘계학술대회 논문집 전자세라믹스 센서 및 박막재료 반도체재료 일렉트렛트 및 응용기술
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    • pp.117-120
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    • 2000
  • The relation of crystal phase and charge/discharge capacity of $Li[Li_yMn_{2-y}]O_4$ were studied for different degrees of Li substitution (y). All cathode material showed spinel phase based on cubic phase in X-ray diffraction. Other peaks didn't show in spite of the increase of y value in $Li[Li_yMn_{2-y}]O_4$. Ununiform of $Li[Li_yMn_{2-y}]O_4$ which calcinated by (111) face and (222) face was more stable than that of pure $LiMn_2O_4$. In addition, At TG analysis, calcined $Li[Li_{0.1}Mn_{1.9}]O_4$ exhibited much mass loss at $800{\mu}m$. The cycle performance of the $Li(Li_yMn_{2-y}]O_4$ was improved by the substitution of $Li^{1+}$ for $Mn^{3+}$ in the octahedral sites. Specially, $Li[Li_{0.08}Mn_{1.92}]O_4$ and $Li[Li_{0.1}Mn_{1.9}]O_4$ cathode materials showed the charge and discharge capacity of about 125mAh/g at first cycle, and about 95mAh/g after 70th cycle. It is excellent than that of pure $LiMn_2O_4$, which 125mAh/g at first cycle, 65mAh/g at 70th.

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흡수식냉난방기용 다성분 리튬염 작동매체의 증기압 및 용해도 측정 (Measurement and Analysis on the Physical Properties of Multi Lithium Salts Solution in Absorption Heat-Pumps)

  • 주우성;김희택;오영삼;백영순
    • 공업화학
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    • 제9권1호
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    • pp.82-88
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    • 1998
  • 고효율 공냉형 흡수식 냉방기를 위한 신작동매체로 기존의 $LiBr-H_2O$계에 높은 흡수성과 용해성를 지닌 $LiNO_3$과 LiCl 무기물을 각각 첨가하여 제조하였다. 본 연구를 통하여 제조된 다성분계의 작동매체에 대한 용해도와 증기압을 측정하여 $LiBr-H_2O$계와 비교 분석하였으며, 이들에 대한 최적혼합비를 각각 구하였다. 용해도 측면에서 $LiBr-LiNO_3-H_2O$계의 경우, LiBr과 $LiNO_3$의 최적혼합 몰비는 5:1이었으며, 반면 $LiBr-LiNO_3-LiCl-H_2O$계의 경우 LiBr, $LiNO_3$, LiCl의 최적혼합몰비는 5:1:2로 나타났다. 한편 증기압은 $LiBr-H_2O$계에 $LiNO_3$의 첨가량이 증가하였으나, LiCl의 경우에는 첨가량이 증가함에 따라 감소하는 경향을 각각 나타내었다.

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