Electronic Materials Letters
·
2016
·Vol. 12
·期 6
·804-811
·
IF 2.057
Yao Jing,Wang Xinlu,Zhao Xinru,Wang Jinxian,Zhang Hongbo,Yu Wensheng,Liu Guixia,Dong Xiangting
The Li 2 MnO 3 -modified Li 1.2 Ni x Co 0.1 Mn 0.9-x O 2 (x = 0.2, 0.45, 0.7) as cathode materials for lithium-ion batteries have been successfully synthesized by a simple electrospinning process. The structure, morphology and electrochemical performances of the resulting products are studied systematically. The as-prepared Li 2 MnO 3 -modified Li 1.2 Ni x Co 0.1 Mn 0.9-x O 2 (x = 0.2, 0.45, 0.7) with a diameter of 200-300 nm has an initial discharge capacity of 168.740 mAh·g −1 , coulombic efficiency of 99.6% and a reversible capacity as high as 139.016 mAh·g −1 after 200 cycles at a current rate of 0.2 C. The excellent electrochemical performances of which are attributed to the stabilization of Li 2 MnO 3 structure, the role of Li 2 MnO 3 is contribute extra lithium to the reversible capacity and to facilitate Li + transport through the structure.
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
Materials
·
2021
·Vol. 14
·期 16
·4751
·
IF 3.623
Lian-Bang Wang,He-Shan Hu,Wei Lin,Qing-Hong Xu,Jia-Dong Gong,Wen-Kui Chai,Chao-Qi Shen
Lithium-rich manganese oxide is a promising candidate for the next-generation cathode material of lithium-ion batteries because of its low cost and high specific capacity. Herein, a series of xLi2MnO3·(1 − x)LiMnO2nanocomposites were designed via an ingenious one-step dynamic hydrothermal route. A high concentration of alkaline solution, intense hydrothermal conditions, and stirring were used to obtain nanoparticles with a large surface area and uniform dispersity. The experimental results demonstrate that 0.072Li2MnO3·0.928LiMnO2nanoparticles exhibit a desirable electrochemical performance and deliver a high capacity of 196.4 mAh g−1at 0.1 C. This capacity was maintained at 190.5 mAh g−1with a retention rate of 97.0% by the 50th cycle, which demonstrates the excellent cycling stability. Furthermore, XRD characterization of the cycled electrode indicates that the Li2MnO3phase of the composite is inert, even under a high potential (4.8 V), which is in contrast with most previous reports of lithium-rich materials. The inertness of Li2MnO3is attributed to its high crystallinity and few structural defects, which make it difficult to activate. Hence, the final products demonstrate a favorable electrochemical performance with appropriate proportions of two phases in the composite, as high contents of inert Li2MnO3lower the capacity, while a sufficient structural stability cannot be achieved with low contents. The findings indicate that controlling the composition through a dynamic hydrothermal route is an effective strategy for developing a Mn-based cathode material for lithium-ion batteries.Keywords:lithium-rich manganese oxide;nanocomposite;dynamic hydrothermal;inert Li2MnO3;cycling stability
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zihao Su,Zhihao Guo,Haoyu Xie,Meizhen Qu,Hao Wang,Gongchang Peng
The Li 2 MnO 3 phase is a double-edged sword hanging over lithium-rich manganese-based cathode materials (LLOs). It provides a theoretical specific capacity of over 300mAh/g for LLOs, but it is also the main source of issues such as low Initial Coulombic efficiency (ICE), poor rate performance, and voltage decay. In recent years, related research has primarily focused on the lattice oxygen. From the perspective related to the Li 2 MnO 3 phase, this study achieves different activation degrees of Li 2 MnO 3 phase through ingenious electrochemical methods . It conducts a detailed analysis of the phase transition and polarization of Li 2 MnO 3 phase under high and low rates, and delves into the different mechanisms that cause the electrochemical performance degradation of LLOs under high and low rates. The results show that during low-rate cycling, the more Li 2 MnO 3 phase in LLOs, the more transformation of crystal structure from layered to spinel phase occurs during cycling, and the structural transformation of the material will ultimately lead to the degradation of cycle performance and voltage decay. During high-rate cycling, due to the intrinsic conductivity difference of Li 2 MnO 3 phase, the large polarization effect of LLOs can lead to severe decomposition of the electrolyte at high voltages, resulting in the degradation of cycle performance. Therefore, conducting research on LLOs focused on the Li 2 MnO 3 phase may be an effective approach, providing a new modification idea for achieving more excellent cycling performance of LLOs.
研究领域:
材料科学
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电化学
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能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Yubo Yang,Heng Su,Tianhao Wu,Yuyuan Jiang,Danmin Liu,Pengfei Yan,Haolai Tian,Haijun Yu
The mechanism research of structure-related reactions on Li 2 MnO 3 is important to enhance the electrochemical performance of lithium-manganese-rich layered oxides . Although there are some reports on the structure evolution of Li 2 MnO 3 during cycling process, the employed research techniques are very limited, mainly in/ex-situ X-ray diffraction, X-ray absorption and transmission electron microscopy . Here, atomic pair distribution function, a method to study the local atomic arrangement on the basis of average spectroscopic information, is used for the first time to study the local structure evolution of Li 2 MnO 3 during electrochemical charge/discharge cycles. The results clearly demonstrate that Mn 3+ /Mn 4+ redox couple is activated and Mn ions are reduced during discharging process. Some Mn ions in Mn layers can significantly migrate to Li layers and occupy the octahedral sites. As a result, a portion of inserted Li ions can occupy the face-shared tetrahedron sites, accompanied by the formation of local spinel-like structure. This work provides an important and suitable method based on the average spectroscopic information to investigate the local structure of electrode materials of lithium-ion batteries as well as other advanced battery systems.
研究领域:
材料科学
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电化学
·
电池技术
·
结构分析
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 36
·2401497
·
IF 13
Shiqi Liu,Jie Wan,Boya Wang,Chenghan Li,Yulong Wang,Lin Wang,Haipeng Wu,Nian Zhang,Xu Zhang,Haijun Yu
Manganese-based lithium-rich layered oxides (Mn-LLOs) are promising candidate cathode materials for lithium-ion batteries, however, the severe voltage decay during cycling is the most concern for their practical applications. Herein, an Mn-based composite nanostructure constructed Li 2 MnO 3 (LMO@Li 2 MnO 3 ) is developed via an ultrathin amorphous functional oxide Li x MnO y coating at the grain surface. Due to the thin and universal LMO amorphous surface layer etched from the lithiation process by the high-concentration alkaline solution, the structural and interfacial stability of Li 2 MnO 3 are enhanced apparently, showing the significantly improved voltage maintenance, cycle stability, and energy density. In particular, the LMO@Li 2 MnO 3 cathode exhibits zero voltage decay over 200 cycles. Combining with ex situ spectroscopic and microscopic techniques, the Mn 2+/4+ coexisted behavior of the amorphous LMO is revealed, which enables the stable electrochemistry of Li 2 MnO 3 . This work provides new possible routes for suppressing the voltage decay of Mn-LLOs by modifying with the composite functional unit construction.
研究领域:
材料科学
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电化学
·
储能
·
锂离子电池
·
纳米材料
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xuheng Jiang,Qinfeng Zheng,Shun Zheng,Zuojun Yang,Yixiao Zhang,Xi Liu,Liwei Chen
Li 2 MnO 3 , a cobalt- and nickel-free layered oxide material with high theoretical capacity, is a promising candidate for next-generation, cost-effective cathode materials in lithium-ion batteries. However, its practical application is hindered by severe irreversible phase transition from layered to spinel structure and oxygen loss, resulting in poor cycling performance. In this study, a high-entropy stabilized material, Li 1.0 Na 0.2 K 0.2 Mn 0.535 Zr 0.015 Cu 0.025 Mg 0.025 O 1.7 F 0.3 (HE-LMO), is developed to mitigate these issues. The high-entropy design effectively stabilizes the layered structure, suppresses the formation of Mn 3 O 4 , and reduces irreversible oxygen evolution. As a result, HE-LMO exhibits enhanced structural stability and delivers a specific capacity of ≈270 mAh g −1 after 20 cycles, attributed to the activation of reversible oxygen redox activity. Advanced characterization techniques, including X-ray absorption spectroscopy, in situ X-ray diffraction, and ex situ aberration-corrected scanning transmission electron microscopy, are employed to elucidate the impact of high-entropy stabilization on the material's performance. These findings highlight the effectiveness of high-entropy stabilization in improving lithium-rich manganese-based cathode materials, providing a novel strategy for developing low-cost, high-performance 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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能源存储
·
无机固体化学
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先进电池技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Qian Liu,Li Zhang,Yucheng Liu,Xiaoqiang Zheng,Xuna Liu,Zhongquan Zhong,Liping Wei,Qianqian Zhao,Tingting Yao,Ping Yang
With appropriate cerium (Ce) doping, the layered lithium ion-sieve precursor Li 1.37 Ce 0.001 Mn 1.22 O 3 was synthesized using hydrothermal and solid-phase calcination, which exhibited Li/Mn ratio exceeding 1, indicating a high theoretical adsorption capacity. The incorporation of Ce further stabilized the spatial configuration of the layered ion-sieve and controlled the dissolution loss ratio of manganese (Mn) to approximately 0.55%. At 25 °C, with pH of 9 and initial lithium-containing solution concentration of 100 mg/L, the adsorption capacity can reach around 33 mg/g. Despite the presence of interfering ions, it maintained selective adsorption of lithium (Li). The lithium adsorption process by layered lithium ion-sieve adhered to the Langmuir adsorption isotherm model, while the kinetics of adsorption conformed to pseudo-second-order kinetics. This adsorption process was characterized as spontaneous and endothermic, with higher temperatures and concentrations of lithium solutions facilitating both the adsorption process and capacity. It was found that in simulation analysis, compared to the cubic ion-sieve precursor, Li in the layered structure occupied more spatial points, resulting in a more compact stacking and increased bond energy. It alleviated the dissolution loss of Mn during the pickling process. The proximity of Ce resulted in a reduction of the charge on Mn and Li. An appropriate amount of Ce doping will enhance the valence state of Mn; however, excessive Ce doping led to the depletion of electrons from nearby Mn and Li. During pickling process, the Li surrounding Ce in the precursor were preferentially replaced by hydrogen (H) due to their lower charge.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 8
·1273-1280
·
IF 4.592
Chenguang Dai,Jing Ye,Shiyong Zhao,Ping He,Haoshen Zhou
Graphical What′s on tap today ? Li 4 Ti 5 O 12 (LTO) and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres show a good electrochemical performance and high tap density. The Li 4 Ti 5 O 12 / x Li 2 MnO 3 ⋅(1- x ) LiMO 2 lithium-ion battery system can offer a higher energy density than Li 4 Ti 5 O 12 /LiCoO 2 cells. In this work, we propose an effective way to prepare nanosized Li 4 Ti 5 O 12 (LTO) microspheres and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres by similar spray-drying methods. Both obtained materials are accumulated by primary nanoparticles and show a spherical morphology with particle distribution of 10–20 μm. The LTO microspheres deliver a tap density of 1.04 g cm −3 , while the tap density of NCM microspheres is 2.07 g cm −3 , which means an enhanced volumetric energy density. The as-prepared LTO microspheres have a reversible capacity of 170 mA h g −1 at 0.1 C and a capacity retention of 97 % after 250 cycles at 1 C. The NCM microspheres have an initial discharge capacity of 270 mA h g −1 with a corresponding Coulombic efficiency of 88 % at 0.03 C. Both materials show a relatively good rate capability. The Li 4 Ti 5 O 12 /0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 cells deliver a high cathode specific capacity of 273 mA h g −1 and good initial Coulombic efficiency of 88 % at 0.03 C, and can be developed for powering hybrid and plug-in hybrid vehicles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 22
·11930-11939
·
IF 7.443
Shaojie Han,Yonggao Xia,Zhen Wei,Bao Qiu,Lingchao Pan,Qingwen Gu,Zhaoping Liu,Zhiyong Guo
The Li-rich layered oxides are attractive electrode materials due to their high reversible specific capacity (>250 mA h g−1); however, the origin of their abnormal capacity is still ambiguous. In order to elucidate this curious anomaly, we compare the lattice oxygen oxidation states among the Li-rich layered oxide Li1.14Ni0.136Co0.136Mn0.544O2, Li2MnO3 and LiNi0.5Co0.2Mn0.3O2, the two components in Li-rich layered oxides, and the most common layered oxide LiCoO2 before and after initial charge–discharge. For simplicity, we employ chemical treatments of NO2BF4 and LiI acetonitrile solutions to simulate the electrochemical delithiation and lithiation processes. X-ray photoelectron spectroscopy (XPS) studies reveal that part of lattice oxygen in Li1.14Ni0.136Co0.136Mn0.544O2 and Li2MnO3 undergoes a reversible redox process (possibly O2− ↔ O22−), while this does not occur in LiNi0.5Co0.2Mn0.3O2 and LiCoO2. This indicates that the extra capacity of Li-rich layered oxides can be attributed to the reversible redox processes of oxygen in the Li2MnO3 component. Thermogravimetric analysis (TGA) further suggests that the formed O22− species in the delithiated Li1.14Ni0.136Co0.136Mn0.544O2 can decompose into O2 at about 210 °C. This phenomenon demonstrates a competitive relationship between extra capacity and thermal stability, which presents a big challenge for the practical applications of these materials.
研究领域:
材料科学
·
电化学
·
储能
·
电池材料
·
固态化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Lin Lin,Jialiang Yin,Bocheng Zhang,Keyu Zha,Shuang Tao,Jing Wang,Liang Fang,Mizhen Zhao,Chunhua Lu,Zhongzi Xu
In response to the escalating challenges of climate change and the effects of urban heat island, the development of energy-efficient cooling solutions has become increasingly crucial. This study addresses this pressing need by introducing a novel class of metal-doped Li2MnO3 pigments that exhibit synergistic cooling effects through enhanced near-infrared (NIR) reflectance and selective infrared emission. We present a one-step synthesis method for three innovative cooling pigment systems: single-phase Li2Mn1–xTixO3 (0 ≤ x ≤ 0.8) and mixed-phase Mn1–xZrx and Mn1–xHfx, all synthesized via a solid-state reaction. Ti doping in Li2Mn1–xTixO3 significantly enhanced NIR reflectance up to 0.890 (x = 0.4), a substantial improvement over undoped Li2MnO3 (0.486). The mixed-phase Mn1–xZrx and Mn1–xHfx pigments demonstrated similarly high NIR reflectances of 0.883 and 0.911, respectively. Crucially, all pigments maintained high infrared emissivity (>0.830) in the atmospheric window (8–14 μm), contributing to their radiative cooling properties. The metal doping not only improved cooling performance but also modulated the pigment color from deep red to orange-red, enabling the production of aesthetically pleasing cooling materials. Coatings formulated with these pigments exhibited improved NIR reflectance while maintaining high emissivity. Pigments in composite coatings demonstrated superior cooling performance compared to single-phase and commercial pigments. Through simulating sunlight exposure experiments, the doped pigments all showed better cooling effects compared to commercially available iron oxide pigments and undoped pigments. Furthermore, outdoor experiments conducted in Shenzhen, Nanjing, and other locations indicated that the pigments also exhibited excellent cooling effects under direct sunlight. It was observed that the temperature was lower than outdoor facilities such as tracks and seats with similar colors. These findings represent a significant advancement in the development of efficient, colored cooling materials for architectural and industrial applications, addressing the urgent need for sustainable thermal management solutions in the face of global warming and urbanization.
研究领域:
材料科学
·
纳米技术
·
热管理
·
能源效率
·
环境科学
·
应用物理
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Lu-Ri Bao,Jing-Ze Zhang,Wei-Ping Tang,Shu-Ying Sun
The Mn-based Li 1.6 Mn 1.6 O 4 ion sieve is among the most effective lithium adsorbents due to its high lithium-ion adsorption capacity and selectivity for Li-ions. However, the inherent disadvantages of manganese dissolution and low structural stability prevent its industrial application. In this study, a series of Li 1.6 Mn 1.6 O 4 @R were synthesized by the low temperature solid phase hydrothermal method that exhibit highly anti-dissolution properties for the lithium adsorption from brine water. The LMO-L, LMO-LM, and LMO-M adsorbents show great adsorption capacities of 46.0 mg g −1 , 43.0 mg g −1 , and 38.0 mg g −1 compared to the 42.3 mg g −1 for the pristine adsorbent. After 20 cycles the dissolution loss of Mn was 0.06 % of LMO-L adsorbents. This improvement in adsorption properties is attributed to the stabilized layered structure due to the evolution of oxygen during the coating reaction, and the inhibition of the interfacial side reactions between the solution and the adsorbent by metal oxide coating. X-ray diffraction, and X-ray photoelectron spectroscopy analysis indicate the formation of Li 2 MnO 3 on the material surface, which can increase tetravalent manganese on the surface. Furthermore, our work may provide new insights for the design of efficient Mn-based adsorbents with high stability for water treatment applications.
研究领域:
材料科学
·
环境科学
·
化学工程
·
无机化学
✓ 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）