CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Chengyi Zhu,Jianxiong Liu,Xiaohua Yu,Yingjie Zhang,Peng Dong,Xiao Wang,Yannan Zhang
Spinel LiMn 2 O 4 is regarded as a promising positive material candidate for contemporary lithium-ion batteries (LIBs). However, its development is hindered by the poor Li + diffusion during high charge/discharge rates and unstable cyclic performance associated with Mn dissolution under elevated temperature. Herein, a facile hydrothermal method with solid-state calcination is introduced to design one-dimensional (1D) La-doped LiMn 2 O 4 nanorods and ultimately enhance their cathode utilization in high-temperature and long-cycling conditions. Surprisingly, LiLa 0.03 Mn 1.97 O 4 nanorods exhibit excellent high-temperature cyclic performance for over 1000 cycles, and deliver a promising discharge capacity of 87.2 mAh g −1 at 20C rate. Furthermore, theoretical calculations confirm that compared with the pristine sample, a lower bandgap and dispersed distribution of electrons are also strong evidence of the improved electrochemical performance of LiMn 2 O 4 after La doping. This research offers a new strategy to achieve high-performance LiMn 2 O 4 -based positive materials for the development of advanced LIBs.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaorui Sun,Ruijuan Xiao,Xiqian Yu,Hong Li
Mn dissolution is one of the most important factors for the failure of LiMn2O4 batteries. Doping has been widely adopted in the modification of LiMn2O4 cathodes; however, there is still a lack of theoretical guidance on screening the dopants. Here, through first-principles calculations, we systematically investigated the effects of all 3, 4d transition metals as well as Mg, Ca, Sr, Al, Ga, and In on the surface oxygen stability of LiMn2O4 cathodes, which has been proved to be correlated with the stability of the surface Mn atoms. Six competitive dopants, namely Nb, Ru, Mo, V, Tc, and Ti, were screened out. Besides, for three dopants in low valence states (Mg, Cu, and Zn), their Li-site doping can more effectively stabilize the surface oxygen atoms compared with Mn-site doping. Finally, we synthesized LiMn2O4 samples with Mg, Mo, and Nb surface doping to validate the rationality of the computational results. We found that particle morphology should also be considered in addition to surface oxygen stability for controlling Mn dissolution. Moreover, the electrochemical performance of LiMn2O4 batteries is a more complex issue and cannot be solely regulated by Mn dissolution. During the experiments, we have explored novel efficient binary chromogenic reagents for ultraviolet–visible spectroscopy analysis that can be used for rapid and low-cost Mn dissolution detection. This work provides a paradigm for the systematic design of the surface modification of the LiMn2O4 cathode under theoretical guidance.
研究领域:
材料科学
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理论计算
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电池技术
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DOI
PubMed
高影响因子
Science Bulletin
·
2025
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IF 21.1
Xiangxi Lou,Penglei Yan,Qingqing Zhang,Binglei Jiao,Zhongyu Li,Panpan Xu,Muhan Cao,Jinxing Chen,Qiao Zhang
Addressing the dual challenges of solid waste pollution and resource scarcity, the upcycling of spent lithium-ion batteries (LIBs) into catalysts for plastic recycling presents a compelling sustainable solution. We come up with an innovative dual-waste co-recycling strategy that simultaneously achieves high-value reutilization of low-cost spent lithium manganese oxide (LMO) cathodes and efficient depolymerization of diverse polyester wastes. Crucially, the lithium-deficient nature of spent LMO drives partial Mn 3+ -to-Mn 4+ conversion within Mn–O octahedral units, which not only reinforces adsorption and activation of polyester molecules, but also heightens. To be more specific, degraded LMO exhibits 17.5-fold higher activity than pristine counterparts in glycolysis. In comparison with conventional methods, techno-economic analysis confirms the strategy’s economic viability, while lifecycle assessment reveals a 98.2% reduction in greenhouse gas emissions and a 98.5% decrease in fossil resource consumption. This work establishes a sustainable pathway for upcycling both LIBs and plastic waste, offering a scalable blueprint for advancing circular economy paradigms.
研究领域:
环境科学
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材料科学
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化学工程
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可持续技术
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资源循环利用
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2021
·
IF 4.724
Liang Zhu,Yingbing Zhang,Xiaoyu Zhao,Yaoxin Jiao,Zijian Zhao,Yanfei Wang,Nianjun Yang
LiMn 2 O 4 (LMO) is a promising cathode material for the assembly of lithium ion batteries in that it satisfies the requirement for a high specific capacity, but it lacks structural stability during long-term cycling. To overcome this challenge, Al 2 O 3 and PPy are coated onto LiMn 2 O 4 (PPy/Al 2 O 3 /LMO) using a sol–gel method followed by oxidative chemical polymerization. The discharge capacity of PPy/Al 2 O 3 /LMO reaches 121.73 mAh g −1 at a rate of 1C. The retention is as high as 95.81% even after 100 charge/discharge cycles. The enhanced performance of PPy/Al 2 O 3 /LMO for Li ion storage results from improved electron conductivity, a more rapid ion migration rate, and reduced Mn ion dissolution. This strategy could be further utilized for the synthesis of other cathode materials for use in lithium ion batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 7
·6478-6487
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IF 1.5
Yuhan Yao,Zhiwen Wang,Xiaohua Yu,Yingjie Zhang,Jianguo Duan,Chengyi Zhu,Zhitong Hu,Zhengjun Shen,Qiang Wang,Zhaolin Zhan,Peng Dong,Yannan Zhang
LiMn 2 O 4 @Al 2 O 3 cathode materials for lithium ion batteries are prepared through an sol-gel method with the assistance of tert-butanol. A uniform amorphous Al 2 O 3 layer is formed on the surface of LiMn 2 O 4 under the control of the hydrolysis mechanism of aluminum ion (Al 3+ ) and hydroxyl group (OH). The products are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), power X-ray diffraction (XRD), galvanostatic charge-discharge test system, electrochemical impedance spectroscopy(EIS) and inductively-coupled plasma emission spectrograph (ICP-AES). Structural and surface analysis reveal that the crystal structure and overall morphology of the LiMn 2 O 4 electrode are found to be not significant unaffected by Al 2 O 3 coating. Notably, the Al 2 O 3 -coating assistant by tert-butanol can produce a compact amorphous layer on the LiMn 2 O 4 particles, and displays capacity losses of only 92.2% after 100 cycles at 55 o C, which is much better than bare sample and the sample synthesized without the assistant of tert-butanol. Furthermore, EIS and ICP analyses show that the Al 2 O 3 coating assisted by tert-butanol significantly improves the electro-conductivity and relieves the dissolution of Mn in electrolyte.
研究领域:
材料科学
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电化学
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储能
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Yan Ren,Jiayi He,Shengyu Jiang,Rui He,Qidong Liang,Bin Zhu,Yanfen Wen,Shuxin Zhuang
Octahedral spinel lithium manganate dioxide (LiMn 2 O 4 , LMO) achieves remarkable electrochemical properties, but manganese dissolution during extended cycling process still cannot be well avoided. Herein, the oxygen vacancies within LiMn 2 O 4 can be effectively modulated by extending the calcination duration. The density functional theory (DFT) calculation and experiments verified that appropriate oxygen vacancies not only promotes the structural stability, but also accelerates the charge transfer to improve the cycle performance under high C rate. Among them, the LMO sintered at 750 °C for 10 h (LMO-10) presented prominent electrochemical performance, delivering 114.58 mAh/g with the capacity retention rate of 95.90 % after 500 cycles at 5C, while the unmodified sample only exhibits 64.46 mAh/g with low retention of 63.75 %. This highly effective and facile approach to manipulate oxygen vacancies of spinel LiMn 2 O 4 would facilitate to develop advanced cathode materials for lithium-ion batteries.
研究领域:
材料科学
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电化学
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锂离子电池
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储能
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DOI
高影响因子
Communications Chemistry
·
2026
·Vol. 9
·期 1
·14
·
IF 6.2
Zhang Zhushun,Du Jun,Li Tenghao,Sun Hengchao,Li Shuai bing,Peng Huakun,Liu Peng,Du Dapeng,Wang Tianyi,Wang Chengyin,Pan Likun,Li Jiabao
Mn-site doping in spinel LiMn 2 O 4 (LMO) mitigates Mn 3+ -induced Jahn-Teller distortion. However, this strategy faces inherent trade-offs. Specifically, low-valent doping weakens oxygen bonding, while high-valent doping increases Mn 3+ content. To overcome these limitations, this work proposes dual-lanthanide (La 3+ /Ce 3+ ) co-doping. Through sol-gel synthesis, LiLa 0.1 Ce 0.1 Mn 1.8 O 4 (LLCMO) achieves synergistic performance enhancements. Particularly, La reduces Mn 3+ content to 43.13%, suppressing lattice distortion and widening Li+ diffusion pathways via its large ionic radius. Concurrently, Ce (in a mixed Ce 3+ /Ce 4+ state) enhances charge delocalization, lowering electron transfer barriers and boosting conductivity. Critically, La-Ce cooperation mitigates Mn dissolution while stabilizing the spinel framework. Consequently, LLCMO exhibits a 3.2-fold higher Li+ diffusion coefficient than pristine LMO. Furthermore, it delivers 111.2 mAh g −1 at 0.5 C with 90.9% retention after 100 cycles, and remarkably retains 76.0 mAh g −1 after 1000 cycles even at 10 C. Thus, this dual-doping strategy establishes a generalizable design principle for enhancing stability/kinetics in diverse cathodes via a synergistic division-of-labor mechanism.
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Wei Shi,Yulong Zhang,Zirui Wang,Wenbiao Ma,Xiao Du,Zhong Liu,Xiaogang Hao
Spinel LiMn 2 O 4 is promising for electrochemical lithium extraction from high-Mg 2+ /Li + brines, but Mn dissolution limits its cycling stability. Here, we propose an interfacial synergistic strategy: coating LiMn 2 O 4 with a carbon layer and incorporating sulfonated ionic polymers (Nafion) during electrode fabrication. The tortuous carbon pores, combined with Nafion's enrichment effect, increase the local Mn 2+ concentration near the interface. This accumulation suppresses the Mn 3+ disproportionation reaction in LiMn 2 O 4 crystals, thereby mitigating Mn dissolution. XPS and EPR analyses confirm the effective immobilization of Mn 2+ within the film electrode assembly. The modified film electrode assembly achieves a low Mn loss of 0.336% after 20 adsorption-desorption cycles. This work demonstrates that rational design and optimization of the critical interfacial layer in electrodes can substantially extend the cycling life of LiMn 2 O 4 film electrode assembly, providing a robust material foundation for practical applications.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jing Wang,Youlong Xu,Jingping Wang,Xiangdong Ding
Despite spinel-structured LiMn 2 O 4 (LMO) cathode material has been successfully commercialized for large scale energy storage, its cycling stability in practical applications still awaits for further improvement. Herein, we provided an effective strategy by adding phosphate in the preparation process, and this modification play a dual effect on LMO materials. Impressively, HRTEM indicated that Li 3 PO 4 generated on the particle surface protects the LMO particles from electrolyte corrosions, while the fast ion conductor can effectively improve the lithium ion diffusion coefficient from 4.506 × 10 −12 cm 2 s −1 to 1.570 × 10 −11 cm 2 s −1 . Meanwhile, the tetrahedral ion doped into the octahedrally transition metal oxide units, enhances the p-type carrier effect, resulting in the carrier density and Hall mobility are improved by a factor of ∼5 and ∼10, respectively. Electrochemical performance among the LMOP 0.50 cathode with a high initial discharge capacity of ∼140 mA h g −1 at 0.1 C, and a capacity retention of 95.5 % after 500 cycles at 1 C. Consequently, the introduction of phosphate provides a new strategy for modifying LMO cathode material.
研究领域:
电化学
·
能源材料
·
锂离子电池
·
材料科学
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DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Kunlei Zhu,Qian Li,Zhongmeng Xue,Qi Yu,Xicheng Liu,Zhongqiang Shan,Kai Liu
High cost, low safety, and low capacity are critical factors limiting the wide application of lithium (Li) batteries in our daily life. TiO2 and LiMn2O4 are both advanced electrode materials with advantages of low cost and high safety. Although TiO2/LiMn2O4 full batteries have been reported by several groups, these batteries only deliver low areal capacities (<1 mA cm–2), which is far from the criterion of commercially available Li-ion batteries (at least 2 mA cm–2). Here, we report high-areal-capacity TiO2/LiMn2O4 full batteries using a configuration containing anodes of mesoporous TiO2 spheres and cathodes of LiMn2O4 nanorods. Specifically, mesoporous TiO2 spheres are prepared by an improved solvothermal method, and their electrochemical performance is investigated using Li/TiO2 half-batteries. Because of their high specific areas, abundant pores, and stable structures, the mesoporous TiO2 spheres demonstrate remarkable cycling performances: after a test period as long as ∼1000 h, they still deliver a capacity as high as 150 mAh g–1 beyond 500 cycles at 1 C (1 C = 170 mAh g–1). LiMn2O4 nanorods are fabricated using β-MnO2 nanorods as the precursor, and their electrochemical performances are studied using Li/LiMn2O4 half-batteries as well. Furthermore, we design TiO2-limited TiO2/LiMn2O4 full batteries and investigate their electrochemical performances. The mesoporous TiO2 sphere/LiMn2O4 nanorod full batteries exhibit areal capacities as high as ∼4 mA cm–2, which is much higher than the values of conventional TiO2/LiMn2O4 full batteries and comparable to those of commercially available Li-ion batteries. This work could make a substantial step toward the commercialization of TiO2/LiMn2O4-based full batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
VACUUM
·
2023
·
IF 4
Wangqiong Xu,Shimei Guo,Qiling Li,Shubiao Xia,Feixiang Cheng,Fengrui Sui,Ruijuan Qi,Yiming Cao,Rong Huang
Great efforts have been devoted to improving the cycling stability and the high-rate performance of spinel LiMn 2 O 4 cathode. Herein, we demonstrate that Co doping can improve the electrochemical performance of spinel LiMn 2 O 4 . We elucidate the atomic position of Co in spinel LiMn 2 O 4 configuration and the stability improvement mechanism of the Co-doped LiMn 2 O 4 cathode by using the state-of-art spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM). The results show that the Co 3+ ions occupy the Mn octahedral 16d sites to reconstruct a more robust LiCo x Mn 2−x O 4 framework, which is beneficial for stabilizing the LiMn 2 O 4 crystal structure by ameliorating Mn dissolution and inhibiting Jahn-Teller distortion. Concomitantly, the doped Co atoms can offer short path lengths for Li + ions intercalation and deintercalation that leads to accelerated Li + diffusion kinetics. The as-designed optimal LiCo 0.05 Mn 1.95 O 4 presents a respectable capacity retention of 83.81 % after 1000 cycles at 10C (1C = 148 mAh g −1 ), with an initial discharge capacity of 86.31 mAh g −1 . Especially, excellent capacity retention of 78.52 % is obtained after 1000 cycles even at a high current rate of 15C. Our research shed light on the microscopic mechanism of Co doping on the cycling stability enhancement of spinel LiMn 2 O 4 toward high-rate performance LIBs .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 92
·75333-75340
·
IF 3.84
Qingqing Wang,Xiusheng Zhang,Yunlong Xu,Dong Liu,Hui Dong,Yang Zhang
A series of Ni and F ion doped LiMn2O4 composite cathode materials are synthesized via a sol–gel method with citric acid as the chelating agent. The morphology and structure of LiNixMn2−xO4−yFy were characterized by XRD, SEM, EDS and the electrochemical performance was tested and characterized by CV and EIS. The results showed that Ni and F ions were uniformly dispersed in the lattice without changing the structure and morphology of LiMn2O4. LiNi0.03Mn1.97O3.95F0.05 exhibits an excellent electrochemical performance among all the samples, and delivers an initial discharge capacity of 120.3 mA h g−1 at 1C and with a retention of 94.5% (25 °C) and 80.4% (55 °C) after the 100th cycle respectively. The results demonstrated that the dual-doping of Ni and F ions in lithium manganate can prevent the manganate from dissolving in the electrolyte and enhance the cycling performance at elevated temperatures, exhibiting excellent performance at different discharge rates.
研究领域:
材料科学
·
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）