Advances in Materials Science and Engineering
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2022
·Vol. 2022
·期 1
·3109178
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IF 2.098
Yuxian Wang,Jing Gu,Xian Li,Yan Zhu,Hongyun Hu,Huan Liu,Guangqian Luo,Hong Yao
Cellulose-originated three-dimensional graphene oxide CNT-modified LiOH·H 2 O (3D-GO-CNTs-LiOH·H 2 O) was synthesized by the hydrothermal method. LiOH·H 2 O nanoparticles (5–50 nm) were homogeneously dispersed inside the 3D-GO-CNTs frames. The composite showed enhanced heat storage density, excellent thermal conductivity, and greatly improved hydration rate due to both the hydrophilic reaction interface of 3D-GO-CNTs frames and reduced size of LiOH·H 2 O nanoparticles. LiOH·H 2 O content ratio of 23% (3D-GO-CNTs-LiOH·H 2 O-1) results in best heat storage performance with activation energy of 23.8 kJ/mol, thermal conductivity of 3.06 W/m·K, and heat storage capacity of 2800 kJ/kg. 3D-GO-CNTs-LiOH·H 2 O shows 4.2 folders heat storage capacity than that of pristine LiOH·H 2 O after the same hydration reaction. Other composite materials also show good performance: 3D-GO-CNTs-LiOH·H 2 O-2 (activation energy: 28.5 kJ/mol, thermal conductivity: 2.33 W/m·K, and heat storage capacity: 2051 kJ/kg.); 3D-GO-CNTs-LiOH·H 2 O-3 (activation energy: 32.3 kJ/mol, thermal conductivity: 2.01 W/m·K, and heat storage capacity: 1983 kJ/kg.). The addition of cellulose originated 3D-GO-CNTs was proved to be an excellent strategy to boost the heat storage performance of LiOH·H 2 O.
研究领域:
材料科学
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化学工程
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能源存储
✓ 已验证
DOI
高影响因子
Energy Technology
·
2021
·Vol. 9
·期 7
·2001086
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IF 3.631
Lin Li,Shijie Li,Tao Zeng,Lisheng Deng,Hongyu Huang,Jun Li,Noriyuki Kobayshi,Lin Liu,You Zhou
3D Graphene (3D-GF) modified with different additive concentrations (phytic acid [PA] and ascorbic acid [AA]) is developed and then combined with different LiOH contents by the hydrothermal method to obtain composite materials. It can be found that the addition of PA and AA will not destroy the carbon skeleton structure of 3D-GF. With increasing additive content, the thermal conductivities of modified 3D-GF first increase and reach their maximum values at 8 mg mL −1 . The modified 3D-GF with the highest thermal conductivity is selected to be combined with different LiOH contents. The addition of PA and AA can broaden the charging temperature range from 60–110 to 30–200 °C and improve the LiOH hydration rate and heat storage density. Compared with the PA-modified composite, the AA-modified composite shows smaller (about 7.6 nm) and more uniform LiOH·H 2 O particles (the particles size standard deviation of 3D-GF-AA-LiOH·H 2 O is 1.1503), a larger specific surface area (119 m 2 g −1 ), higher heat storage density (the highest value of 2763 kJ kg −1 for LiOH⋅H2O, which can be about 4.2 times of pure LiOH), and less influenced by the change of LiOH content (the thermal conductivity standard deviation of 3D-GF-AA-LiOH·H 2 O is 0.123).
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Ming Zhou
LiFePO 4 battery is one of the three mainstream cathode materials for Lithium-ion batteries, with a market share of approximately 60%. With the rapid development of electric vehicles, plenty of spent LiFePO 4 batteries will inevitably accumulate, causing a waste of resources and environmental problems. Thus, spent LiFePO 4 recycling has become increasingly important. During the recovery process, mixing spent LiFePO 4 black powder and H 2 SO 4 resulted in a leaching solution containing complex compositions, such as Li, Fe, P, Co, Ni, Cu, Mg, Mn, and Al. The P and Fe elements are recovered through the FePO 4 precipitation. After solid-liquid separation, 5-6 g/L of Li and other accompanying impurities are retained in the mother liquor. The Li-bearing solution above is purified using the two-step precipitation method. Then, battery grade LiOH·H 2 O is successfully synthesized by using the Li 2 SO 4 causticizing process. The effects of operating parameters, including reaction temperature, excess coefficient of NaOH, Li concentration, and reaction time are investigated in detail. Under the optimal conditions, 96.18% of the Li in the initial concentrated Li 2 SO 4 solution is converted to LiOH solution by the reaction (Li 2 SO 4 + 2NaOH + 10H 2 O → 2LiOH + Na 2 SO 4 ·10H 2 O). Meanwhile, the Li content in Na 2 SO 4 ·10H 2 O can be controlled at around 0.2%, and the Li recovery rate for the process of Na 2 SO 4 by-product prepared by Na 2 SO 4 ·10H 2 O is as high as 98.30%. This study is expected to provide valuable insights into the high value-added recovery of Li from spent LIBs.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2017
·
IF 3.444
Shijie Li,Hongyu Huang,Xixian Yang,Yu Bai,Jun Li,Noriyuki Kobayashi,Mitsuhiro Kubota
Lithium hydroxide monohydrate was modified by impregnation method with hygroscopic materials, such as polyethylene glycol (PEG), lithium chloride (LiCl), 13X-zeolite and NaY-zeolite. The lithium hydroxide monohydrate particles were well dispersed into nanoscale as composed with 13X-zeolite and NaY-zeolite. These composite materials exhibited obviously improved heat storage capacity and higher hydration rate than pure lithium hydroxide monohydrate, and the introduction of hygroscopic materials leads to greatly decreasing of apparent activation energy for the thermochemical reaction process. It is probably due to that hydrophilic materials provide efficient hygroscopic reaction interface and also show catalytic effect to the hydration reaction. Among these thermochemical materials, LiOH·H 2 O/13X-zeolite showed the lowest apparent activation energy (21.5 kJ/mol) and the highest heat storage density (1949 kJ/kg), which is 2.9 times higher than the pure lithium hydroxide after the same hydration time.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 8
·4815-4825
·
IF 3.917
Yang Xixian,Li Shijie,Zhang Shiyi,Chen Xin,Peng Shuai
Abstract Commonly used nanocarbon composite materials are routinely synthesized from petroleum-based resources. To avoid their bad impact on the environment, using cellulose-based materials as the promising resources is a better choice due to its easy acquisition and rich reserves. In this study, microcrystalline cellulose was selected as the carbon precursor to synthesize novel cellulose-derived 3D-graphene/LiOH·H 2 O nanomaterials for chemical heat storage to improve the efficiency of thermal energy utilization. The characterization and performance test results show that LiOH·H 2 O particles (5–20 nm) were highly dispersed on the 3D graphene carbon skeleton. These materials had excellent heat storage densities and thermal conductivities due to a completely new, hydrophilic, nano-reactive interface on 3D graphene. Among the materials, 3D-GF-VC-LiOH·H 2 O (Ascorbic acid-modified 3D-graphene/LiOH·H 2 O) exhibited the best heat storage and thermal conductivity properties. It achieved a thermal conductivity of 2.6 W/m K, which was 1.5 times that obtained with pure LiOH·H 2 O, and its heat storage density (2157 kJ/kg) was 3.3 times that of pure LiOH·H 2 O (661 kJ/kg). The activation energy could decrease to 27.5 kJ/mol. Moreover, the heat storage temperature range of LiOH·H 2 O was clearly expanded by introduction of 3D graphene. Hence, the addition of cellulose-derived 3D graphene is a very efficient means by which the design of chemical heat storage materials can be improved. Graphical abstract
研究领域:
材料科学
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能量存储
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纳米技术
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可持续材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yue Yin,Xian Luo,Benjun Xu
Li 4 Ti 5 O 12 (LTO) is the most promising anode material for lithium-ion batteries owing to its excellent cycle stability and safety. However, the electrochemical performance of LTO at high rates is limited by its low conductivity. Generally, LTO preparation requires organic titanium sources, which are expensive. In this study, inexpensive H 2 TiO 3 was used as the titanium source, LiOH‧H 2 O served as the lithium source, and NH 3 ‧H 2 O was added to control the pH of the solution. Simple one-step liquid-phase deposition and calcination were performed for obtaining in situ self-assembled LTO submicron spheres with stable morphology and excellent electrochemical performance. According to electrochemical performance tests, the sample calcined with 4 mL of 25% NH 3 ‧H 2 O at 700 °C (LTO-4–700) exhibited the best performance. Its discharge capacity remained at 176.4 mAh g −1 over 100 cycles at 87.5 mA g −1 and retained at 136.7 mAh g −1 over 500 cycles at 875 mA g −1 , and its specific capacity was 105.6 mAh g −1 over 1000 cycles, even at a current of 1750 mA g −1 with a retention rate of 96.7%. Furthermore, LTO-4–700 exhibited excellent rate performance at 3500 mA g −1 compared to other samples. Cyclic voltammetry and electrochemical impedance spectroscopy confirmed that submicron spherical LTO-4–700 had a high Li + migration rate and low electrochemical impedance.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）