The Dong-Xi-Taijinaier Salt Lake(DXTSL)of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(δ...The Dong-Xi-Taijinaier Salt Lake(DXTSL)of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(δ7Li)of water and solid samples along the Nalenggele River catchment were studied in combination with rock leaching experiments.The results showed the hot springs in the upstream contained high content of lithium and ratio of Li×1000/total dissolved solids(1.5–3.5),but the lowerδ7Li values(4.33‰–11.59‰),meaning that it is one important lithium sources.The leaching experiments by the rich-lithium volcanic rocks(average content of 474.7 mg/kg)showed that under temperature of 20–80℃and long time duration(24–96 h),the concentration of lithium released by leaching of the sampled volcanic rocks increased from 0.58 to 1.49 mg/L,with the leaching rate decreasing from 0.024 to 0.015 mg/(L·h)and the corresponding lithium release rate increasing from 29%to 74%.Calculation based on water-salt balance showed that the total amount of lithium contribution from hydrothermal fluids and volcanic rock weathering is about 4.99 and 0.29 Mt since 13.1 ka,respectively.Therefore,hot springs and leaching of volcanic rocks are main contributors to lithium deposit in DXTSL.展开更多
LiNi0.8Co0.1Mn0.1O2 cathode was synthesized using transition metal acetates under different synthesis conditions. Simultaneous thermogravimetric–differential scanning calorimetry–derivative thermogravimetric analysi...LiNi0.8Co0.1Mn0.1O2 cathode was synthesized using transition metal acetates under different synthesis conditions. Simultaneous thermogravimetric–differential scanning calorimetry–derivative thermogravimetric analysis was applied to investigating the mixture of transition metal acetates. X-ray powder diffraction and charge–discharge test were adopted to characterize the as-prepared LiNi0.8Co0.1Mn0.1O2. The mixture of transition metal acetates undergoes dehydration and decomposition during heating. All the examined LiNi0.8Co0.1Mn0.1O2 samples have a layered structure with R3 m space group. LiNi0.8Co0.1Mn0.1O2 samples prepared with different lithium sources under different synthesis conditions exhibit very different charge–discharge performances. The sample synthesized via the procedure of sintering at 800 °C after heating lithium carbonate and transition metal acetates at 550 °C achieves a highest capacity of 200.8 m A·h/g and an average capacity of 188.1 mA ·h/g in the first 20 cycles at 0.2C.展开更多
基金supported by the Funds for the Qinghai Province(Nos.2020-ZJ-7322020-ZJ-932Q)+3 种基金Key Deployment projects of the Chinese Academy of Sciences(No.ZDRW-ZS-2020-3)the National Natural Science Foundation of China(No.42007169)The Fourth Batch of Qinghai Province“Thousand Talents Program for High-End Innovative Talents”(Jibin Han)supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(No.2019QZKK0805)。
文摘The Dong-Xi-Taijinaier Salt Lake(DXTSL)of Qaidam Basin is known as one of rich lithium reserves in China.However,the source of lithium deposits in this region remains unclear.The hydrochemistry and lithium isotopes(δ7Li)of water and solid samples along the Nalenggele River catchment were studied in combination with rock leaching experiments.The results showed the hot springs in the upstream contained high content of lithium and ratio of Li×1000/total dissolved solids(1.5–3.5),but the lowerδ7Li values(4.33‰–11.59‰),meaning that it is one important lithium sources.The leaching experiments by the rich-lithium volcanic rocks(average content of 474.7 mg/kg)showed that under temperature of 20–80℃and long time duration(24–96 h),the concentration of lithium released by leaching of the sampled volcanic rocks increased from 0.58 to 1.49 mg/L,with the leaching rate decreasing from 0.024 to 0.015 mg/(L·h)and the corresponding lithium release rate increasing from 29%to 74%.Calculation based on water-salt balance showed that the total amount of lithium contribution from hydrothermal fluids and volcanic rock weathering is about 4.99 and 0.29 Mt since 13.1 ka,respectively.Therefore,hot springs and leaching of volcanic rocks are main contributors to lithium deposit in DXTSL.
基金Project(2010ZC051)supported by the Natural Science Foundation of Yunnan Province,ChinaProject(20140439)supported by the Analysis and Testing Foundation from Kunming University of Science and Technology,ChinaProject(14118245)supported by the Starting Research Fund from Kunming University of Science and Technology,China
文摘LiNi0.8Co0.1Mn0.1O2 cathode was synthesized using transition metal acetates under different synthesis conditions. Simultaneous thermogravimetric–differential scanning calorimetry–derivative thermogravimetric analysis was applied to investigating the mixture of transition metal acetates. X-ray powder diffraction and charge–discharge test were adopted to characterize the as-prepared LiNi0.8Co0.1Mn0.1O2. The mixture of transition metal acetates undergoes dehydration and decomposition during heating. All the examined LiNi0.8Co0.1Mn0.1O2 samples have a layered structure with R3 m space group. LiNi0.8Co0.1Mn0.1O2 samples prepared with different lithium sources under different synthesis conditions exhibit very different charge–discharge performances. The sample synthesized via the procedure of sintering at 800 °C after heating lithium carbonate and transition metal acetates at 550 °C achieves a highest capacity of 200.8 m A·h/g and an average capacity of 188.1 mA ·h/g in the first 20 cycles at 0.2C.
