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Effect of annealing temperature on structure and electrochemical properties of LiCoO_2 cathode thin films

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Rare metals 2006年第Z2期25卷 189-192页

作者： YANG Zhimin XING Guangjian YANG Jian MAO Changhui DU Jun Advanced Electronic Materials institute General Research Institute for Nonferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China Department of Materials Science and Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China

LiCoO2 thin films, which can be used as a cathode material in microbatteries, were deposited using radio frequency (r.f.) magnetron sputtering system from a LiCoO2 target and in an O2+Ar atmosphere. The films were characterized by various methods such as XRD, SEM and AFM. The LiCoO2 films were annealed in air at 300, 500, 700 and 800 ℃ respectively. The effect of the annealing temperature on the structure, the surface morphology and the electrochemical properties of the films were investigated. The LiCoO2 thin film deposited at room temperature is amorphous and has smaller grain size. With increasing of annealing temperature, the crystallinity of the films is promoted. When the annealing temperature increases to 700 ℃, the films have a perfect crystalline LiCoO2 phase. The LiCoO2 thin film without annealing has no discharge plateau and small discharge capacity (about 27 μAh·cm-2μm). The discharge capacity increases with the increasing of annealing temperature and reaches 47 μAh·cm-2μm for the film annealed with 700 ℃, which also shows the typical discharge plateau of 3.9 V. The cycle performance of LiCoO2 thin films of as grown and annealed at different temperatures were studied. In the case of the film without thermal treatment, the capacity fading is much faster than that of the film annealed at different temperature, showing about 40% capacity loss only after 25 cycles. However, in the case of the film annealed at 700 ℃, the capacity reaches to steady state gradually and maintained constantly with cycling. After 25 times cycling, the discharge capacity of the film annealed at 700 ℃ decreases to about 36.9 μAh·cm-2·μm, only 0.8% capacity loss per cycle.

关键词： LiCoO2 thin film annealing temperature structure electrochemical properties

Effect of surface preparation on corrosion properties and nickel release of a NiTi alloy

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Rare metals 2006年第Z2期25卷 243-245页

作者： MIAO Weidong MI Xujun XU Guodong LI Huachu general research institute for nonferrous metals Beijing 100088 China State Key Laboratory for Fabrication & Processing of Nonferrous Metals Beijing 100088 China General Research Institute for Nonferrous Metals Beijing 100088 China State Key Laboratory for Fabrication & Processing of Nonferrous Metals Beijing 100088 China

Surface preparation is potentially important to the corrosion and biomedical properties of NiTi shape memory alloys. The effect of surface preparation on corrosion properties and nickel release of a Ti-56 wt.%Ni alloy has been studied. Surface of the NiTi coupons were prepared by four methods, namely, chemical etching, electropolishing, mechanical polishing and oxidizing, and then examined by corrosion test system. Furthermore, the Ni ion releases from NiTi samples with different surface preparations dipped in 1% HCl solution were analysed. Compared with the surface after chemical treatment, mechanical polishing and thermal oxidation, electropolished surface has better corrosion resistance and less nickel release for not only its lower surface roughness, but also the composition and property of its surface film.

关键词： Ni Ti alloy surface preparation corrosion properties nickel realease

Electrolytic properties and element migration in Ni-TiB_(2)/Al_(2)O_(3)composite cathode

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Rare metals 2021年第1期40卷 57-64页

作者： Yu-Dong Liang Li-Jun Wang Deng-Peng Chai Sheng-Zhong Bao Ting-Ting Niu Jun-Wei Wang Ying Liu Rare metals and Metallurgy Materials research institute General Research Institute for Nonferrous MetalsBeijing 100088China Zhengzhou nonferrous metals research institute Co. LtdChaleoZhengzhou 450041China

With alumina sol as binder and Ni metal as sintering aids,the Ni-TiB_(2)/Al_(2)O_(3) composite cathode material for aluminum electrolysis was prepared by coldpressed *** mechanical properties of the composite cathode material were *** electrolytic properties were identified by a 20-A electrolysis *** samples before and after electrolysis test were measured by energy-dispersive spectroscopy(EDS).The migration behavior of various elements in the electrolysis process was studied by phase *** result shows that Ni metal can effectively fill the gap between the aggregate during the sintering process,which can improve the sintering density of the composite cathode material *** voltage of the 20-A electrolysis test is *** impurity of aluminum liquid is 0.42%.The aluminum liquid can wet the cathode surface effectively,and the Ni-TiB_(2)/Al_(2)O_(3) composite is an ideal wettable cathode *** the process of electrolysis,the alkali elements in the electrolyte penetrate the electrode,where K goes deeper than *** generated on the cathode surface will also penetrate the cathode through the gap of the composite material,while Ni in the electrode will spread into the aluminum liquid layer.

关键词： Aluminum electrolysis TiB_(2) Alumina sol Cold-pressed sintering Infiltration

Age-hardening characteristic of an Al-Zn-Mg-Cu alloy produced by spray deposition

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Rare metals 2007年第2期26卷 163-168页

作者： WANG Feng XIONG Baiqing ZHANG Yongan ZHU Baohong LIU Hongwei ZHANG Zhihui WANG Zixing State Key Laboratory for Fabrication and Processing of nonferrous metals Beijing General Research Institute for Nonferrous Metals Beijing 100088 China

Al-10.8Zn-2.8Mg-1.9Cu alloy was synthesized by spray atomization and deposition technique. GP zones and age-hardening process in the alloy were investigated using high-resolution electron microscopy （HREM）, selected area diffraction （SAD）, and differential scanning calorimetry （DSC） analysis. The results indicated that spray deposition process accelerated the aging kinetics of the alloy at an aging temperature of 120℃, thereby reducing the peak aging time to 16 h. GPⅠ and GPⅡ are the two types of zones that are major precipitates for the alloy under peak-aged condition. The precipitation sequence for the alloy is also discussed.

关键词： aluminium alloy precipitation GP zone spray deposition

Quasi-static and dynamic plastic deformation behavior in titanium with vanadium addition

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Rare metals 2023年第7期42卷 2361-2370页

作者： Qiao-Chu Wang Song-Xiao Hui Wen-Jun Ye Rui Liu Xiao-Yun Song State Key Laboratory for Fabrication&Processing of nonferrous metals General Research Institute for Nonferrous MetalsBeijing100088China

Compressive properties,microstructure features and deformation modes were investigated in binary Ti-(2,4,8)wt%V alloys during quasi-static(1×10^(-3)s^(-1))and dynamic(3×10^(3)s^(-1))*** compressive behavior shows a strong dependence on the loading strain rate and vanadium content contained in pure Ti,such that the flow stress increases with the increase in strain rate and vanadium content ranging from 2 wt%to 8 wt%.The microstructure features are clearly different from each other for alloys with different vanadium contents or under quasi-static and dynamic loading *** examination of deformation microstructures by optical microscopy and electron backscattered diffraction indicates that twinning behavior occurs during quasi-static and dynamic compressions and the twinning density increases with strain rate increasing but decreases with vanadium *** existence of{1012},{1121}and{1122}type twinning was further *** the help of the calculated Schmid factor map,the values of critical resolved shear stress of twinning types mentioned above have been obtained and verified to be rarely affected by the loading strain rate but sensitive to the vanadium *** vanadium-rich alloys(Ti-8V),twins are rarely observed but dislocation slip mechanism is active by transmission electron microscopy *** vanadium content increasing,both the critical resolved shear stress of twinning types and the content ofβphase with abundant slip systems increase,reflecting a suppression of twinning but an active dislocation slip mechanism.

关键词： Titanium alloys Strain rate Deformation mode Twinning Electron backscattered diffraction

Microstructure of phases in a Cu–Zr alloy

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Rare metals 2015年第10期34卷 706-709页

作者： Li-Jun Peng Xu-Jun Mi Bai-Qing Xiong Hao-Feng Xie Guo-Jie Huang State Key Laboratory of nonferrous metals and Processes General Research Institute for Nonferrous Metals

The morphology and crystallography of phases in the Cu-0.12% Zr alloy were investigated by scanning electron microscope(SEM), transmission electron microscope(TEM), and high-resolution transmission electron microscope(HRTEM). The results show that the as-cast microstructure of Cu–Zr alloy is mainly Cu matrix and eutectic structure which consist of Cu and Cu5Zr phases with a fine lamellar structure. The disk-shaped and plateliked Cu5Zr phases with fcc structure are found in the matrix, in which habit plane is parallel to {111}a plane of the *** the copper matrix and Cu5Zr phase,there exists an orientation relationship of [112]a|| [011]Cu5Zr;(111)a||(111)Cu5Zr. The space structure model of Cu5Zr phase can be established.

关键词： Cu–Zr alloy Microstructure Crystal structure Morph

LAMELLAR STRUCTURE IN LONG RANGE ORDERED PHASE δ′-TiN_(0.5)

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中国有色金属学会会刊：英文版 1997年第3期7卷 8-14页

作者： Yang, Caiying Du, Jun Shi, Likai general research Inst for nonferrous Metals Beijing China

ＬＡＭＥＬＬＡＲＳＴＲＵＣＴＵＲＥＩＮＬＯＮＧＲＡＮＧＥＯＲＤＥＲＥＤＰＨＡＳＥδ′ＴｉＮ０．５①ＹａｎｇＧａｉｙｉｎｇ，ＤｕＪｕｎ，ＳｈｉＬｉｋａｉＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｆｏｒＮｏｎｆ... 详细信息

ＬＡＭＥＬＬＡＲＳＴＲＵＣＴＵＲＥＩＮＬＯＮＧＲＡＮＧＥＯＲＤＥＲＥＤＰＨＡＳＥδ′ＴｉＮ０．５①ＹａｎｇＧａｉｙｉｎｇ，ＤｕＪｕｎ，ＳｈｉＬｉｋａｉＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｆｏｒＮｏｎｆｅｒｒｏｕｓＭｅｔａｌｓ，Ｂｅｉｊ...

关键词： lamellar structure δ′ TiN 0.5 long range ordering transformation

SEPARATION OF Ta AND Nb BY EXTRACTION WITH SEC-OCTANOL-HF-H_2SO_4 SYSTEM

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中国有色金属学会会刊：英文版 1996年第3期6卷 40-43页

作者： Chen Huifang He Wannian Zhang Yuqi(Beijing general research Instilute for nonferrous metals, Beijing 100088) Beijing general research institute for nonferrous metals Beijing 100088 China

ＳＥＰＡＲＡＴＩＯＮＯＦＴａＡＮＤＮｂＢＹＥＸＴＲＡＣＴＩＯＮＷＩＴＨＳＥＣ－ＯＣＴＡＮＯＬ－ＨＦ－Ｈ_２ＳＯ_４ＳＹＳＴＥＭ￥ＣｈｅｎＨｕｉｆａｎｇ；ＨｅＷａｎｎｉａｎ；ＺｈａｎｇＹｕｑｉ（ＢｅｉｊｉｎｇＧｅｎｅｒａ... 详细信息

ＳＥＰＡＲＡＴＩＯＮＯＦＴａＡＮＤＮｂＢＹＥＸＴＲＡＣＴＩＯＮＷＩＴＨＳＥＣ－ＯＣＴＡＮＯＬ－ＨＦ－Ｈ_２ＳＯ_４ＳＹＳＴＥＭ￥ＣｈｅｎＨｕｉｆａｎｇ；ＨｅＷａｎｎｉａｎ；ＺｈａｎｇＹｕｑｉ（ＢｅｉｊｉｎｇＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｌｕｔ...

关键词： sec-octanol Ta Nb extraction

TEM study on Si_(0.65) Ge_(0.35) /p Si HIP infrared detector

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中国有色金属学会会刊：英文版 1999年第3期9卷 481-486页

作者： Liu Ansheng(刘安生), Shao Beiling(邵贝羚), Liu Zheng(刘峥), Wang Jing(王敬) general research institute for nonferrous metals, Beijing 100088, P.R.china general research Inst for nonferrous Metals Beijing China

Microstructure of P + Si 0.65 Ge 0.35 /p Si HIP infrared detector has been studied by using localization cross section transmission electron microscopy. The photosensitive region of the detector consists of 6 P + Si 0.65 Ge 0.35 layers and 5 UD Si layers, which are flat and have thickness of 6 nm and 32 nm, respectively. A stress field exists on the interface between Si 0.65 Ge 0.35 and UD Si layers, but no any crystal defect has been found in this region, except the edges of this region. Both Si 0.65 Ge 0.35 and UD Si layers on amorphous SiO 2 layer consist of polycrystals and are in wave. There is defect area in the edges of photosensitive region. The area appears in a shape of inverse triangle and the maximum width is less than 120 nm. The crystal defects are stacking faults and microtwins.

关键词： infrared detector heterojunction semiconductor device microstructure of semiconductor device transmission electron microscopy