LiODFB electrolyte's compatibility with LiNi_(0.5)Mn_(1.5)O_4 high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, th...LiODFB electrolyte's compatibility with LiNi_(0.5)Mn_(1.5)O_4 high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, the LiODFB-based electrolyte has better electrochemical stability than LiPF_6. AC impedance plots show that the LiODFB battery has a lower charge-transfer resistance than LiPF_6 battery at 60 °C, which indicates that LiODFB battery has excellent cycling performance at high temperature. At 25 and 60 °C, the LiNi_(0.5)Mn_(1.5)O_4/Li half cells with Li ODFB or LiPF_6 as electrolyte all have simple redox peak, showing that each of them has an excellent reversibility. LiODFB battery has better cycle performance than LiPF_6 battery at 25 °C and 60 °C. At 25 °C, their 0.5C initial discharge specific capacities are 126.3 and 131.6 m A·h/g, and their capacity retention ratios of the 100 th cycle are 97.1% and 94.7%, respectively. At 60 °C, their 0.5C initial discharge specific capacities are 132.6 and 129.1 m A·h/g, and their capacity retention ratios of the 100 th cycle are 94.1% and 81.7%, respectively.展开更多
Single crystals of LiY6O5（BO3）3 were obtained by the flux method and its structure was determined by a four-circle automatic diffractometer with a MoKα radiation. It crystallizes in monoclinic, space group P21/n wi...Single crystals of LiY6O5（BO3）3 were obtained by the flux method and its structure was determined by a four-circle automatic diffractometer with a MoKα radiation. It crystallizes in monoclinic, space group P21/n with a = 8.330（3）, b = 15.444（4）, c = 8.780（3）°A,β = 91.85（3）°, V = 1129.0（6）°A^3, Z = 4, Mr= 796.83, F（000） = 1456, μ = 30.567 mm^-1, Dc= 4.688 g/cm^3, the final R = 0.0722 and wR = 0.1304. It exhibits a three-dimensional fiamework of yttrium-oxygen polyhedra interconnected by common edges and corners. B and Li atoms are located in the planes and cavities formed by oxygen atoms, respectively.展开更多
The energy absorption coefficient of Cu-doped lithium potassium borate (LKB) dosimeter and TLD 100 was reported theoretically and checked by simulation of Monte Carlo n-particle code version 5 (MCNP5). The response of...The energy absorption coefficient of Cu-doped lithium potassium borate (LKB) dosimeter and TLD 100 was reported theoretically and checked by simulation of Monte Carlo n-particle code version 5 (MCNP5). The response of LKB:Cu for various photon energies (20 keV to 10 MeV) were determined by calculation, experiment and simulation. The obtained results were discussed and compared with TLD 100. For more precise results, the geometry specification, the source information, the material information and tallies were identified and fully described. The results obtained by simulation were determined based on the tally F6, which exhibited the response as energy-dependant on heating function instead of flux. The current results showed that the prepared dosimeter has a greater response than TLD 100 in the lower energy range and a flat response in the higher energy ranges (≥100 keV).展开更多
The dislocations in lithium tetraborate crystal have been investigated by means of synchrotron radiation white beam topography in BSRL(Beijing Synchrotron Radiation Laboratory).The Burgers'vectors of these disloca...The dislocations in lithium tetraborate crystal have been investigated by means of synchrotron radiation white beam topography in BSRL(Beijing Synchrotron Radiation Laboratory).The Burgers'vectors of these dislocations are determined by their vanishing conditions.Both screw and edge dislocations exist in the specimen.展开更多
Amounts of lithium-containing salt lake brine resources are widely distributed in the four provinces named Qinghai,Tibet,Inner Mongolia and Xinjiang province,especially the salt lakes in Qinghai-Tibet Plateau are abun...Amounts of lithium-containing salt lake brine resources are widely distributed in the four provinces named Qinghai,Tibet,Inner Mongolia and Xinjiang province,especially the salt lakes in Qinghai-Tibet Plateau are abundant of展开更多
Layer-Structure lithium zinc borate, LiZnBO3, is prepared by a solid state reaction of LiOH·H2O, ZnO, and H3BO3 at 1000°C for 10 h. Highly preferred orientation and a layer-structure are observed in the powd...Layer-Structure lithium zinc borate, LiZnBO3, is prepared by a solid state reaction of LiOH·H2O, ZnO, and H3BO3 at 1000°C for 10 h. Highly preferred orientation and a layer-structure are observed in the powder XRD patterns and the SEM images, respectively. The Rietveld analysis indicates a monoclinic unit cell with space group C2/c, and the lattice parameters are refined as a = 8.827 ?, b = 5.078 ?, c = 6.171 ?, and β = 118.86°. LiZnBO3 shows the capacity of 17 mAh/g between 1.3 V and 4.3 V (vs. Li/Li+) larger than ZnO.展开更多
1 Introduction Lithium and its compounds as national strategic resources are extensively used in national defense,industrial and agricultural production.As we know,the salt lakes in the western of China are famous for...1 Introduction Lithium and its compounds as national strategic resources are extensively used in national defense,industrial and agricultural production.As we know,the salt lakes in the western of China are famous for its high展开更多
Glass sample of Zinc Lithium Bismuth Borate (25-x) Bi<sub>2</sub>O<sub>3</sub>:20Li<sub>2</sub>O:20ZnO:35B<sub>2</sub>O<sub>3</sub>:xPr<sub>6</sub&g...Glass sample of Zinc Lithium Bismuth Borate (25-x) Bi<sub>2</sub>O<sub>3</sub>:20Li<sub>2</sub>O:20ZnO:35B<sub>2</sub>O<sub>3</sub>:xPr<sub>6</sub>O<sub>11</sub>, (where x = 1, 1.5 and 2 mol%) has been prepared by melt-quenching technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The absorption spectra of three Pr<sup>3+</sup> doped zinc lithium bismuth borate glasses have been recorded at room temperature. The observed optical spectra are discussed in terms of energy states and the intensity of the transitions. The various interaction parameters like Slater-Condon, Lande, bonding and Racah parameters have been computed. Judd-Ofelt intensity parameters and laser parameters have also been calculated. The stimulated emission cross section (σ<sub>p</sub>) for the transition (<sup>3</sup>P<sub>0</sub> → <sup>3</sup>F<sub>2</sub>) is found to be in the range 3.12 - 10.43 * 10<sup>-20</sup> cm<sup>2</sup>. The σ<sub>p</sub> values are comparatively large suggesting the possible utilization of these materials in laser applications.展开更多
The Sichuan Basin,with an area of about 20×104 km2,is situated at 102.5°~110°E and 27.67°~32.67°N.The underground brine resources in Sichuan basin are a type of comprehensive liquid mineral re...The Sichuan Basin,with an area of about 20×104 km2,is situated at 102.5°~110°E and 27.67°~32.67°N.The underground brine resources in Sichuan basin are a type of comprehensive liquid mineral resource.Pingluo展开更多
Lithium difluoro(axalato)borate (LiODFB) was synthesized in dimethyl carbonate (DMC) solvent and purified by the method of solventing-out crystallization. The structure characterization of the purified LiODFB was perf...Lithium difluoro(axalato)borate (LiODFB) was synthesized in dimethyl carbonate (DMC) solvent and purified by the method of solventing-out crystallization. The structure characterization of the purified LiODFB was performed by Fourier transform infrared (FTIR) spectrometry and nuclear magnetic resonance (NMR) spectrometry. The electrochemical properties of the cells using 1 mol/L LiPF6 and 1 mol/L LiODFB in ethylene carbonate (EC)/DMC were investigated, respectively. The results indicate that LiODFB can be reduced at about 1.5 V and form a robust protective solid electrolyte interface (SEI) film on the graphite surface in the first cycle. The graphite/LiNi1/3Mn1/3Co1/3O2 cells with LiODFB-based electrolyte have very good capacity retention at 55 ℃, and show very good rate capability at 0.5C and 1C charge/discharge rate. Therefore, as a new salt, LiODFB is a most promising alternative lithium salt to replace LiPF6 for lithium ion battery electrolytes in the future.展开更多
A new hydrated lithium borate, Li4[B8O13（OH）2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It...A new hydrated lithium borate, Li4[B8O13（OH）2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It crystal- lizes in the triclinic, space group P]-, a=8.4578（5） A, b=8.7877（5） A, c= 10.8058（7） A, a=87.740（3）°, β= 71.819（3）°, γ=61.569（3）°, Z=2, V=665.26（7） A3, Dc=2.043 g/cm3. Its crystal structure features polyborate ani- onic layers with the larger odd 13-membered boron rings constructed by [B8O13（OH）2]4- FBBs. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be -（7953.8 ± 6.6） kJ·mol-1 by using a heat conduction microcalorimeter.展开更多
The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside ...The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside the conduction phenomenon. The conductivity of the glasses decreased due to the decrease in the mobility of mobile Li~＋ ions. This decrease was due to polymerization of glass network caused by the Nd^3＋ ions. Modulus formalism confirmed that the Li~＋ ions overcame the same barrier no matter whether it took part in the conduction process or relaxation process. Scaling of the electrochemical data showed that conduction process in the ion conducting glasses was composition dependent and not the temperature dependent.展开更多
基金Project(K1403375-11)supported by Science and Technology Planning Project of Changsha,China
文摘LiODFB electrolyte's compatibility with LiNi_(0.5)Mn_(1.5)O_4 high-voltage cathode material was studied by cyclic voltammetry, charge-discharge test and AC impedance. The results show that at 25 and 60 °C, the LiODFB-based electrolyte has better electrochemical stability than LiPF_6. AC impedance plots show that the LiODFB battery has a lower charge-transfer resistance than LiPF_6 battery at 60 °C, which indicates that LiODFB battery has excellent cycling performance at high temperature. At 25 and 60 °C, the LiNi_(0.5)Mn_(1.5)O_4/Li half cells with Li ODFB or LiPF_6 as electrolyte all have simple redox peak, showing that each of them has an excellent reversibility. LiODFB battery has better cycle performance than LiPF_6 battery at 25 °C and 60 °C. At 25 °C, their 0.5C initial discharge specific capacities are 126.3 and 131.6 m A·h/g, and their capacity retention ratios of the 100 th cycle are 97.1% and 94.7%, respectively. At 60 °C, their 0.5C initial discharge specific capacities are 132.6 and 129.1 m A·h/g, and their capacity retention ratios of the 100 th cycle are 94.1% and 81.7%, respectively.
基金This work was supported by the Chinese Academy of Sciences (2004AA31g130)
文摘Single crystals of LiY6O5（BO3）3 were obtained by the flux method and its structure was determined by a four-circle automatic diffractometer with a MoKα radiation. It crystallizes in monoclinic, space group P21/n with a = 8.330（3）, b = 15.444（4）, c = 8.780（3）°A,β = 91.85（3）°, V = 1129.0（6）°A^3, Z = 4, Mr= 796.83, F（000） = 1456, μ = 30.567 mm^-1, Dc= 4.688 g/cm^3, the final R = 0.0722 and wR = 0.1304. It exhibits a three-dimensional fiamework of yttrium-oxygen polyhedra interconnected by common edges and corners. B and Li atoms are located in the planes and cavities formed by oxygen atoms, respectively.
文摘The energy absorption coefficient of Cu-doped lithium potassium borate (LKB) dosimeter and TLD 100 was reported theoretically and checked by simulation of Monte Carlo n-particle code version 5 (MCNP5). The response of LKB:Cu for various photon energies (20 keV to 10 MeV) were determined by calculation, experiment and simulation. The obtained results were discussed and compared with TLD 100. For more precise results, the geometry specification, the source information, the material information and tallies were identified and fully described. The results obtained by simulation were determined based on the tally F6, which exhibited the response as energy-dependant on heating function instead of flux. The current results showed that the prepared dosimeter has a greater response than TLD 100 in the lower energy range and a flat response in the higher energy ranges (≥100 keV).
文摘The dislocations in lithium tetraborate crystal have been investigated by means of synchrotron radiation white beam topography in BSRL(Beijing Synchrotron Radiation Laboratory).The Burgers'vectors of these dislocations are determined by their vanishing conditions.Both screw and edge dislocations exist in the specimen.
基金Financial support from the State Surface Project of National Natural Science of China (21276194)the Specialized Research Fund for the Doctoral Program of Chinese Higher Education (20101208110003)the Key Pillar Program of Tianjin Municipal Science and Technology (11ZCKGX02800)
文摘Amounts of lithium-containing salt lake brine resources are widely distributed in the four provinces named Qinghai,Tibet,Inner Mongolia and Xinjiang province,especially the salt lakes in Qinghai-Tibet Plateau are abundant of
文摘Layer-Structure lithium zinc borate, LiZnBO3, is prepared by a solid state reaction of LiOH·H2O, ZnO, and H3BO3 at 1000°C for 10 h. Highly preferred orientation and a layer-structure are observed in the powder XRD patterns and the SEM images, respectively. The Rietveld analysis indicates a monoclinic unit cell with space group C2/c, and the lattice parameters are refined as a = 8.827 ?, b = 5.078 ?, c = 6.171 ?, and β = 118.86°. LiZnBO3 shows the capacity of 17 mAh/g between 1.3 V and 4.3 V (vs. Li/Li+) larger than ZnO.
基金Financial supports from the NNSFCs (Grants 21276194 and 21306136)the Specialized Research Fund for the Doctoral Program of Chinese Higher Education (Grant 20101208110003)the Opening Funds of Tianjin Key Laboratory of Marine Resources and Chemistry for Tianjin University of Science and Technology (Grant 201206)
文摘1 Introduction Lithium and its compounds as national strategic resources are extensively used in national defense,industrial and agricultural production.As we know,the salt lakes in the western of China are famous for its high
文摘Glass sample of Zinc Lithium Bismuth Borate (25-x) Bi<sub>2</sub>O<sub>3</sub>:20Li<sub>2</sub>O:20ZnO:35B<sub>2</sub>O<sub>3</sub>:xPr<sub>6</sub>O<sub>11</sub>, (where x = 1, 1.5 and 2 mol%) has been prepared by melt-quenching technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The absorption spectra of three Pr<sup>3+</sup> doped zinc lithium bismuth borate glasses have been recorded at room temperature. The observed optical spectra are discussed in terms of energy states and the intensity of the transitions. The various interaction parameters like Slater-Condon, Lande, bonding and Racah parameters have been computed. Judd-Ofelt intensity parameters and laser parameters have also been calculated. The stimulated emission cross section (σ<sub>p</sub>) for the transition (<sup>3</sup>P<sub>0</sub> → <sup>3</sup>F<sub>2</sub>) is found to be in the range 3.12 - 10.43 * 10<sup>-20</sup> cm<sup>2</sup>. The σ<sub>p</sub> values are comparatively large suggesting the possible utilization of these materials in laser applications.
基金Project supported by China National Nature Science Foundation (No. 41173071)the Research Fund for the Doctoral Program of Higher Education from the Ministry of Education of China (20115122110001)+1 种基金the Sichuan Youth Science and Technology Innovation Research Team Funding Scheme (2013TD0005)Innovation Team of CDUT(KYTD201405)
文摘The Sichuan Basin,with an area of about 20×104 km2,is situated at 102.5°~110°E and 27.67°~32.67°N.The underground brine resources in Sichuan basin are a type of comprehensive liquid mineral resource.Pingluo
基金Project(2007BAE12B01) supported by the National Key Technology Research and Development Program of ChinaProject(20803095) supported by the National Natural Science Foundation of China
文摘Lithium difluoro(axalato)borate (LiODFB) was synthesized in dimethyl carbonate (DMC) solvent and purified by the method of solventing-out crystallization. The structure characterization of the purified LiODFB was performed by Fourier transform infrared (FTIR) spectrometry and nuclear magnetic resonance (NMR) spectrometry. The electrochemical properties of the cells using 1 mol/L LiPF6 and 1 mol/L LiODFB in ethylene carbonate (EC)/DMC were investigated, respectively. The results indicate that LiODFB can be reduced at about 1.5 V and form a robust protective solid electrolyte interface (SEI) film on the graphite surface in the first cycle. The graphite/LiNi1/3Mn1/3Co1/3O2 cells with LiODFB-based electrolyte have very good capacity retention at 55 ℃, and show very good rate capability at 0.5C and 1C charge/discharge rate. Therefore, as a new salt, LiODFB is a most promising alternative lithium salt to replace LiPF6 for lithium ion battery electrolytes in the future.
文摘A new hydrated lithium borate, Li4[B8O13（OH）2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It crystal- lizes in the triclinic, space group P]-, a=8.4578（5） A, b=8.7877（5） A, c= 10.8058（7） A, a=87.740（3）°, β= 71.819（3）°, γ=61.569（3）°, Z=2, V=665.26（7） A3, Dc=2.043 g/cm3. Its crystal structure features polyborate ani- onic layers with the larger odd 13-membered boron rings constructed by [B8O13（OH）2]4- FBBs. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be -（7953.8 ± 6.6） kJ·mol-1 by using a heat conduction microcalorimeter.
文摘The present investigation was to understand the electrical properties of 27.5 Li2O-（72.5–x） B2O（3-x）Nd2O3 with x=0.5, 1, 1.5 and 2 glasses. We analyzed the impedance data for a wide frequency range to get inside the conduction phenomenon. The conductivity of the glasses decreased due to the decrease in the mobility of mobile Li~＋ ions. This decrease was due to polymerization of glass network caused by the Nd^3＋ ions. Modulus formalism confirmed that the Li~＋ ions overcame the same barrier no matter whether it took part in the conduction process or relaxation process. Scaling of the electrochemical data showed that conduction process in the ion conducting glasses was composition dependent and not the temperature dependent.
