MATERIALS TECHNOLOGY
·
2020
·
IF 1.738
Binggong Yan,Shaoning Lin,Lei Kang,Xuan Song,Zhao Tian,Kaiyong Jiang
Laser annealing is used for preparation of LiMn2O4. The electrochemical characterisation shows that the cycle performance of spinel LiMn2O4 is dependent on the power of the laser and the amount of lithium excess. X-ray diffraction is used to study the phase evolution of laser-annealed LiMn2O4. The morphology of LiMn2O4 particles is observed by scanning electron microscope. Electrochemical tests show that the initial capacity of the laser-annealed LiMn2O4 is less than the untreated LiMn2O4, but the cycle performance improved noticeably.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Zeng Weihao,Xia Fanjie,Wang Juan,Yang Jinlong,Peng Haoyang,Shu Wei,Li Quan,Wang Hong,Wang Guan,Mu Shichun,Wu Jinsong
Fast-charging, non-aqueous lithium-based batteries are desired for practical applications. In this regard, LiMn 2 O 4 is considered an appealing positive electrode active material because of its favourable ionic diffusivity due to the presence of three-dimensional Li-ion diffusion channels. However, LiMn 2 O 4 exhibits inadequate rate capabilities and rapid structural degradation at high currents. To circumvent these issues, here we introduce quintuple low-valence cations to increase the entropy of LiMn 2 O 4 . As a result, the entropy-increased LiMn 2 O 4 -based material, i.e., LiMn 1.9 Cu 0.02 Mg 0.02 Fe 0.02 Zn 0.02 Ni 0.02 O 4 , when tested in non-aqueous lithium metal coin cell configuration, enable 1000 cell cycles at 1.48 A g −1 (corresponding to a cell charging time of 4 minutes) and 25°C with a discharge capacity retention of about 80%. We demonstrate that the increased entropy in LiMn 2 O 4 leads to an increase in the disordering of dopant cations and a contracted local structure, where the enlarged LiO 4 space and enhanced Mn-O covalency improve the Li-ion transport and stabilize the diffusion channels. We also prove that stress caused by cycling at a high cell state of charge is relieved through elastic deformation via a solid-solution transition, thus avoiding structural degradation upon prolonged cycling.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Chen Wu,Mingli Xu,Chengyi Zhang,Lang Ye,Kanglong Zhang,Hengjiang Cong,Lin Zhuang,Xinping Ai,Hanxi Yang,Jiangfeng Qian
The global lithium-ion battery recycling market is witnessing rapid growth considering the limited mineral resources and environmental sustainability. However, the conventional destructive recycling technology, mainly referred as pyrometallurgy and hydrometallurgy, cannot show obvious advantages in the recovering of low-value cathode (i.e. LiMn 2 O 4, abbreviated as LMO), either judged from the perspective of environment or economy. Herein, we develop a facile and cost-effective chemical lithiation strategy to direct regenerate spent LMO cathode, and further investigate the efficacy of our technology for industrial-scale applications. Pyrene-Li compound, a highly reductive reagent capable of donating both e − and Li + , is adopted as the chemical lithiation agent to heal the Li deficiency in the degraded LMO cathode. Both the Li-deficient LMO model compounds prepared from acid delithiation method and the real degraded LMO harvested from commercial cells can be restored as original with comparable long-term stability as the pristine LMO cathode and even superior rate capability. Life-cycle analysis demonstrates that our approach is superior to conventional metallurgies because of its high economic profitability (2.78 $/kg cell) and minimal environmental impact (527 g GHG /kg cell), thus providing a brand new perspective for the recycling of low-value cathodes.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Guolang Zhou,Linlin Chen,Xiaowei Li,Guiling Luo,Zhendong Yu,Jingzhou Yin,Lei Fan,Yanhong Chao,Lei Jiang,Wenshuai Zhu
The extraction of lithium from salt lakes or seawater has attracted worldwide attention because of the explosive growth of global demand for lithium products. The LiMn 2 O 4 -based electrochemical lithium recovery system is one of the strongest candidates for commercial application due to its high inserted capacity and low energy consumption. However, the surface orientation of LiMn 2 O 4 that facilitates Li diffusion happens to be prone to manganese dissolution making it a great challenge to obtain high lithium inserted capacity and long life simultaneously. Herein, we address this problem by designing a truncated octahedral LiMn 2 O 4 (Tr-oh LMO) in which the dominant (111) facets minimize Mn dissolution while a small portion of (100) facets facilitate the Li diffusion. Thus, this Tr-oh LMO-based electrochemical lithium recovery system shows excellent Li recovery performance with high inserted capacity (20.25 mg g −1 per cycle) in simulated brine. In addition, the dissolution rate of manganese per 30 cycles is only 0.44% and the capacity maintained 85% of the initial after 30 cycles. These promising findings accelerate the practical application of LiMn 2 O 4 in electrochemical lithium recovery.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2022
·Vol. 6
·期 7
·2200508
·
IF 15.367
Xiaohong Shang,Jianyun Liu,Bin Hu,Pengfei Nie,Jianmao Yang,Boshuang Zhang,Yiwen Wang,Fei Zhan,Jieshan Qiu
LiMn 2 O 4 is of great potential for selectively extracting Li + from brines and seawater, yet its application is hindered by its poor cycle stability and conductivity. Herein a two-step strategy to fabricate highly conductive and stable CNT-strung LiMn 2 O 4 (CNT-s-LMO) is reported, by first stringing Mn 3 O 4 particles with multiwalled carbon nanotube (CNT), then converting the hybrids into CNT-s-LMO through hydrothermal lithiation. The as-synthesized CNT-s-LMO materials have a net-like structure with CNTs threading through LMO particles. This unique structure has endowed the CNT-s-LMO electrode with excellent conductivity, high specific capacitance, and enhanced rate performance. Because of this, the CNT-s-LMO electrode in the hybrid capacitive deionization cell (HCDI) can deliver a high Li + extraction percentage (≈84%) in brine and an outstanding lithium selectivity with a separation factor of ≈181 at the Mg 2+ /Li + molar ratio of 60. Significantly, the CNT-s-LMO-based HCDI cell has a high stability, evidenced by 90% capacity retention and negligible Mn loss in 100 cycles. This method has paved a new way to fabricate carbon-enabled LMO-based absorbents with tuned structure and superior capacity for electrochemical lithium extraction with high Li + selectivity and exceptional cycling stability, which may help to tackle the shortage in supply of Li-ion batteries in industry in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Jun Gu,Guolang Zhou,Linlin Chen,Xiaowei Li,Guiling Luo,Linjing Fan,Yanhong Chao,Haiyan Ji,Wenshuai Zhu
With the unprecedented heat of lithium resources, it has been a hot topic to find an effective, low-energy-consumption, and eco-friendly method for extracting lithium from salt lakes. As an electrochemically active material, LiMn 2 O 4 (LMO) is widely used in electrochemical lithium extraction. In order to reduce the Mn dissolution loss and improve the cycle stability of LMO, we designed octahedral LMO with controllable particle size by adjusting the water/ethanol volume ratio of the precursor solution. Through the electrochemical performance test, it was found that with the increase in particle size, the cycle stability of LMO and the lithium ion transport performance also improved. The Mn dissolution loss per 30 cycles of LMO (B-LMO) was 0.187%, and the capacity was maintained at the initial 86.9%. The electrochemical lithium extraction system of B-LMO//Ag exhibits excellent lithium extraction performance. After 1 h of extraction, the lithium extraction capacity is 20.6 mg/g, and the energy consumption is 15.2 Wh/mol.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Hu Fu,Weigang Zhu,Wenhua Xu,Zhongwei Zhao
Lithium-ion detection is necessary for extraction of lithium. Electrochemical sensors based on spinel LiMn 2 O 4 /λ-MnO 2 are expected to enable low-cost detection of lithium ions. Many studies demonstrate preferential intercalation of lithium ions, but little research has been done on how the differences in intercalation between lithium and other ions arise. Here, the differences in intercalation were identified by electrochemical impedance spectroscopy. Lithium ions were preferentially intercalated into λ-MnO 2 because of low charge transfer impedance. The apparent diffusion coefficient of sodium or potassium ions was one order of magnitude lower than that of lithium ions, while that of magnesium or calcium ions was two orders of magnitude lower. Therefore, insignificant intercalation of sodium, magnesium, potassium, and calcium ions slowed down diffusion of lithium ions through the channel and obstructed lithium-ion intercalation. The concentration of lithium ions was detected in brine of Baqiancuo Salt Lake by stripping voltammetry using λ-MnO 2 and an average recovery of 95.0 % was achieved. This study gives insights into ion intercalation of LiMn 2 O 4 in brine, which favors improvement of lithium-ion sensor based on LiMn 2 O 4 . In addition, the investigation facilitates understanding of the selectivity of similar materials (e.g., LiFePO 4 and Prussian blue analogous) in intercalation process.
研究领域:
材料科学
·
电化学传感器
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Chuanliang Wei,Huifang Fei,Yongling An,Yuchan Zhang,Jinkui Feng
Spinel LiMn 2 O 4 is considered to be a promising cathode for lithium-ion batteries owing to its low cost, safety, environmental friendliness , high operating voltage and natural abundance of manganese. However, the accelerated dissolution of manganese at elevated temperature results in serious capacity fading, which inhibits its further application in energy storage systems. The dissolution of manganese is mainly caused by the attack of trace acidic species (HF) in liquid electrolyte . Here, we report a facile, universal and effective strategy to suppress the dissolution of manganese at 55 °C by encapsulating LiMn 2 O 4 particles in crumpled Ti 3 C 2 T x nanosheets using an electrostatic self-assembly process. With high electronic conductivity and fast Li + transport capability, such protective layer reduces direct contact between liquid electrolyte and LiMn 2 O 4 particles, suppressing the dissolution of manganese. The composite exhibits larger discharge specific capacity, enhanced rate and cycling capabilities. The capacity retention ratio can be improved by 18.3% at 55 °C after 200 cycles at 2 C. This study provides a new strategy for suppressing the dissolution of manganese at high temperature and widens the road for the application of 2D MXene in energy storage field. The electrostatic self-assembly strategy we proposed is universal and can be applied in other cathode materials, which can arouse much interest of relevant researchers.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2024
·Vol. 38
·期 5
·1429-1437
·
IF 1.3
Yu Sun,Chaofan Li,Hongcheng Gao,Jiaming Li,Jiabin Hao
A cubic spinel LiMn2O4 cathode material with nanoscale was synthesized via a facile liquid-combustion method at 600, 750 and 850 ℃. The crystal structure and surface morphology of LiMn2O4 electrodes have been characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technique. The samples have an average diameter of 200 nm with an octahedral structure with high crystallinity. Benefiting from the excellent structure, the sample prepared at 750 ℃ delivers the highest first discharge capacity of 115.3 mAh·g−1 with remaining 101.5 mAh·g−1 after 400 cycles at 1 C. Moreover, it exhibits a good cycling performance at 55 ℃, still had the capacity of 105.4 mAh·g−1 with a capacity retention of 71.2% following 282 cycles. The facilely synthesized octahedral LiMn2O4 provides a practical application strategy for lithium-ion batteries.
KEY WORDS: Spinel LiMn2O4, Liquid-combustion method, Lithium-ion batteries
Bull. Chem. Soc. Ethiop. 2024, 38(5), 1429-1437.
DOI: https://dx.doi.org/10.4314/bcse.v38i5.18
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanan Wei,Qian Zhang,Yuan Han,Xinyu Xu,Wenmeihui Zhao,Ying Hu,Rongmei Liu,Guixiang Qian,Zhongliang Tian,Chao Yang
In China, 80 % of lithium resources are in the salt lakes of the Tibetan Plateau, although the Mg 2+ /Li + ratios in them are too high, limiting the development of China’s lithium extraction industry from the salt lakes. This study investigates the potential of the LiMn 2 O 4 -Zn cell system for lithium extraction from brines with high Mg 2+ /Li + ratios. The system demonstrates excellent selectivity for Li + and efficiently extracts Li + even in brines with Mg 2+ /Li + ratios as high as 100:1 (wt%). The system operates stably at various brine concentrations, particularly in high-salinity environments. The study also investigates the kinetic performance of the LMO-Zn system, revealing optimal performance at high Li + concentrations and moderate current densities. The LiMn 2 O 4 -Zn cell system presents a promising approach for lithium extraction from brines, offering high selectivity, reversibility, and adaptability.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yiqi Cui,Chengyi Zhu,Rui Huang,Jiaming Liu,Yannan Zhang
LiMn 2 O 4 is regarded as a promising positive material candidate for contemporary lithium-ion batteries (LIBs) in terms of high safety, low cost, and environmental benignity. However, the spinel LiMn2O4 electrodes suffer from rapid capacity fades during lithiation and delithiation at high temperatures. Herein, we describe a simple sol-gel reaction method to modify the surface of LiMn2O4 materials and fill the gaps between particles by LaPO 4 to improve its electrochemical performance and utilization in the room and high temperature. As a result, the as-prepared LiMn 2 O 4 @ LaPO 4 electrode delivers excellent reversible capacity retention of 81.3% after 200 cycles at 1 C rate and exhibits a remarkable capacity of 74.9 mAh g -1 at 10 C rate. Moreover, Mn dissolution measurement reveals that LaPO 4 coating can effectively reduce the manganese dissolution in electrolytes at high temperatures. This general surface-modification strategy will have implications in practical applications for long-life lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 20
·期 1
·517
·
IF 4.614
Yuxin Jiang,Ken Li,Sikpaam Issaka Alhassan,Yiyun Cao,Haoyu Deng,Shan Tan,Haiying Wang,Chongjian Tang,Liyuan Chai
Capacitive deionization (CDI) is a newly developed desalination technology with low energy consumption and environmental friendliness. The surface area restricts the desalination capacities of traditional carbon-based CDI electrodes while battery materials emerge as CDI electrodes with high performances due to the larger electrochemical capacities, but suffer limited production of materials. LiMn2O4is a massively-produced lithium-ion battery material with a stable spinel structure and a high theoretical specific capacity of 148 mAh·g−1, revealing a promising candidate for CDI electrode. Herein, we employed spinel LiMn2O4as the cathode and activated carbon as the anode in the CDI cell with an anion exchange membrane to limit the movement of cations, thus, the lithium ions released from LiMn2O4would attract the chloride ions and trigger the desalination process of the other side of the membrane. An ultrahigh deionization capacity of 159.49 mg·g−1was obtained at 1.0 V with an initial salinity of 20 mM. The desalination capacity of the CDI cell at 1.0 V with 10 mM initial NaCl concentration was 91.04 mg·g−1, higher than that of the system with only carbon electrodes with and without the ion exchange membrane (39.88 mg·g−1and 7.84 mg·g−1, respectively). In addition, the desalination results and mechanisms were further verified with the simulation of COMSOL Multiphysics.Keywords:capacitive deionization;LiMn2O4;lithium ion;desalination capacity;simulation
研究领域:
环境工程
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）