JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2014
·
IF 2.307
Yaoyu Ren,Hui Deng,Rujun Chen,Yang Shen,Yuanhua Lin,Ce-Wen Nan
Cubic garnet-type Al-contained Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (Al-LLZTO) ceramics were prepared by conventional solid-state reaction using either Li 2 CO 3 or LiOH·H 2 O as Li source. The effects of Li source on the lithium ionic conductivity of Al-LLZTO ceramics were systematically investigated by comparing the synthesis processes and characteristics of the mother powders and the microstructures of the sintered pellets made with different Li sources. Different calcination processes of the raw materials mixtures with different Li sources are revealed by thermogravimetry-differential scanning calorimetry investigation. The mother powder derived from LiOH·H 2 O is of higher sintering activity than those made from Li 2 CO 3 at the same calcination temperature. For the LiOH·H 2 O-derived pellets, higher relative density and enhanced lithium-ion conductivity is achieved at a much lower sintering temperature of 1100 °C as compared with Li 2 CO 3 -derived pellets. The highest conductivity obtained at room temperature is 9.28 × 10 −4 S cm −1 , which is the highest value reported to date for the same Ta doping level.
研究领域:
材料科学
·
固态电池
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Hongmei Liu,Guobin Zhu,Li Zhang,Qunting Qu,Ming Shen,Honghe Zheng
A spinel lithium nickel manganese oxide (LiNi 0.5 Mn 1.5 O 4 ) cathode material is synthesized with a modified oxalate co-precipitation method by controlling pH value of the precursor solution and introducing excessive Li source in the precursor. All the samples synthesized through this method are of Fd3m phase with a small amount of P4 3 32 phase. It is found that pH value of the precursor solution considerably affects the morphology, stoichiometry and crystallographic structure of the target material, thereby resulting in different amounts of Mn 3+ ( i.e. , different degree of disorder). 5% excessive Li source in the precursor may compensate for the lithium loss during the high-temperature sintering process and eliminate the Li x Ni 1-x O impurity phase. Under the optimized synthesis conditions, the obtained high-purity LiNi 0.5 Mn 1.5 O 4 spinel exhibits enhanced electrochemical performances. A reversible capacity of ca . 140 mAh g −1 can be delivered at 0.1C and the electrode retains 106 mAh g −1 at 10C rate. When cycled at 0.2C, a capacity retention of more than 98% is obtained in the initial 50 electrochemical cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dehai Meng,Haozhi Duan,Shijie Wu,Peiyi Zhu,Shuxia Yuan
Lithium iron phosphate (LFP) cathode material has been extensively employed in energy storage and electric vehicle applications. However, the conventional solid-state synthesis method for LFP suffers from limitations in reducing anti-site defects and optimizing Li+ migration efficiency along one-dimensional channels. As a result, it exhibits subpar electrochemical performance at high current and low temperature, which hampers its further development. In this work, a micro-nano-scaled high performance LFP cathode material was successfully synthesized using hydrothermal method, offering superior cost-effectiveness and environmental sustainability. The experiment achieved zero pollutant discharge by recycling waste liquid containing lithium. Additionally, in-situ nitrogen-doped carbon coating was applied to the LFP during the hydrothermal process. This approach not only enhanced the material's conductivity but also restrained the growth of LFP crystal cell volume, particularly along the b-axis direction of crystallization. Moreover, the synthesis of low-defect LFP with wider Li + transport channel has significantly enhanced the efficiency of Li+ extraction/insertion of the material, thereby addressing the issue of poor electrochemical performance of LFP at high-rate and low-temperature. Various electrochemical characterization methods have also confirmed that LFP synthesized from recycled lithium waste liquid exhibits significant advantages than commercial LFP, especially in terms of high-current and low-temperatures charge-discharge performance. This novel strategy provides a theoretical foundation for the industrial-scale production of LFP using low-cost hydrothermal methods.
研究领域:
材料科学
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能源存储
·
环境工程
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 36
·期 13
·2311553
·
IF 29.4
Ruyu Shi,Nengzhan Zheng,Haocheng Ji,Mengtian Zhang,Xiao Xiao,Jun Ma,Wen Chen,Junxiong Wang,Hui-Ming Cheng,Guangmin Zhou
Direct regeneration of spent lithium-ion batteries has received wide attention owing to its potential for resource reuse and environmental benefits. The repair effect of direct regeneration methods undergoing heterogeneous repair process is usually inferior, while homogenous repair process plays a vital role to achieve satisfactory repair results. However, the practical applications of current homogeneous repair methods are challenged by the complex operations and relatively high costs owing to the requirement of additional heating or pressurization. Herein, this work proposes a simple strategy to achieve homogeneous repair of spent cathode materials under relatively mild conditions by uniformly precoating lithium source at room temperature and atmospheric pressure. Followed by annealing, highly degraded LiNi 0.83 Co 0.12 Mn 0.05 O 2 with severe Li deficiency and irreversible phase transition is repaired to have an initial capacity of 181.6 mAh g -1 and capacity retention of 80.7% after 150 cycles at 0.5 C. The lithium source used in this strategy is from the spent lithium anode. Moreover, this strategy is suitable for the direct regeneration of various layer oxide cathode materials with different failure degrees. This work provides both theoretical guidance and practical examples for the straightforward, effective, and universally applicable direct regeneration methods.
研究领域:
材料科学
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电化学
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能源存储
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可持续技术
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电池回收
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Xiaojuan Lu,Feng Zhang,Jing Li
Perovskite-type lithium-ion conductor Li 0.33 La 0.56 TiO 3 was prepared via microwave sintering. The influence of lithium sources on the properties of the samples prepared and the compensation of lithium loss were investigated. XRD patterns, exhibiting a mixture of tetragonal and cubic phase, were all similar for the samples made with different lithium sources. The total conductivity of the sample made with Li 2 CO 3 achieved 0.51 × 10 −4 S/cm, which was the highest among all the samples made with different sources. The highest total conductivity of the sample made with Li 2 CO 3 was attributed to the largest grains, which would result in a smaller concentration of less-conductive grain boundaries. The total conductivity of the sample compensated with 5% Li 2 O was 38% higher than the sample made stoichiometrically. Given that grain sizes were similar for the samples compensated with a varied amount of Li 2 O and the relative density of the sample compensated with 5% Li 2 O was even the lowest among these samples, the highest total conductivity was rooted in the highest ratio of cubic phase. These results indicated that lithium sources could influence the properties of the LLTO samples greatly by resulting in a variation on crystalline phase, grain size, and relative density, which collectively determine the migration of lithium ions in polycrystalline Li 0.33 La 0.56 TiO 3 .
研究领域:
材料科学
·
固体化学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）