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学者姓名:尉海军
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摘要 :
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 Li2MnO3 (LMO@Li2MnO3) is developed via an ultrathin amorphous functional oxide LixMnOy 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 Li2MnO3 are enhanced apparently, showing the significantly improved voltage maintenance, cycle stability, and energy density. In particular, the LMO@Li2MnO3 cathode exhibits zero voltage decay over 200 cycles. Combining with ex situ spectroscopic and microscopic techniques, the Mn2+/4+ coexisted behavior of the amorphous LMO is revealed, which enables the stable electrochemistry of Li2MnO3. This work provides new possible routes for suppressing the voltage decay of Mn-LLOs by modifying with the composite functional unit construction.
关键词 :
composite structure composite structure ultrathin amorphous coating ultrathin amorphous coating Mn-based oxide cathode Mn-based oxide cathode voltage decay voltage decay lithium-ion battery lithium-ion battery
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GB/T 7714 | Liu, Shiqi , Wan, Jie , Wang, Boya et al. Zero Voltage-Degradation of Li2MnO3 with Ultrathin Amorphous Li―Mn―O Coating [J]. | SMALL , 2024 , 20 (36) . |
MLA | Liu, Shiqi et al. "Zero Voltage-Degradation of Li2MnO3 with Ultrathin Amorphous Li―Mn―O Coating" . | SMALL 20 . 36 (2024) . |
APA | Liu, Shiqi , Wan, Jie , Wang, Boya , Li, Chenghan , Wang, Yulong , Wang, Lin et al. Zero Voltage-Degradation of Li2MnO3 with Ultrathin Amorphous Li―Mn―O Coating . | SMALL , 2024 , 20 (36) . |
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摘要 :
Layered iron/manganese-based oxides are a class of promising cathode materials for sustainable batteries due to their high energy densities and earth abundance. However, the stabilization of cationic and anionic redox reactions in these cathodes during cycling at high voltage remain elusive. Here, an electrochemically/thermally stable P2-Na0.67Fe0.3Mn0.5Mg0.1Ti0.1O2 cathode material with zero critical elements is designed for sodium-ion batteries (NIBs) to realize a highly reversible capacity of approximate to 210 mAh g-1 at 20 mA g-1 and good cycling stability with a capacity retention of 74% after 300 cycles at 200 mA g-1, even when operated with a high charge cut-off voltage of 4.5 V versus sodium metal. Combining a suite of cutting-edge characterizations and computational modeling, it is shown that Mg/Ti co-doping leads to stabilized surface/bulk structure at high voltage and high temperature, and more importantly, enhances cationic/anionic redox reaction reversibility over extended cycles with the suppression of other undesired oxygen activities. This work fundamentally deepens the failure mechanism of Fe/Mn-based layered cathodes and highlights the importance of dopant engineering to achieve high-energy and earth-abundant cathode material for sustainable and long-lasting NIBs. A high-energy and earth-abundant Na0.67Fe0.3Mn0.5Mg0.1Ti0.1O2 cathode is developed, which shows significantly improved cycling stability at a high charge cut-off voltage of 4.5 V versus Na. Multiscale characterization reveals that the Mg/Ti co-doping improves the surface and bulk structural stability and enhances the cationic and anionic redox reaction reversibility during prolong cycling. image
关键词 :
oxygen anionic redox oxygen anionic redox Fe/Mn-based layered oxides Fe/Mn-based layered oxides Na-ion batteries Na-ion batteries cycling stability cycling stability co-doping co-doping
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GB/T 7714 | Zhang, Xu , Zuo, Wenhua , Liu, Shiqi et al. High-Energy Earth-Abundant Cathodes with Enhanced Cationic/Anionic Redox for Sustainable and Long-Lasting Na-Ion Batteries [J]. | ADVANCED MATERIALS , 2024 , 36 (33) . |
MLA | Zhang, Xu et al. "High-Energy Earth-Abundant Cathodes with Enhanced Cationic/Anionic Redox for Sustainable and Long-Lasting Na-Ion Batteries" . | ADVANCED MATERIALS 36 . 33 (2024) . |
APA | Zhang, Xu , Zuo, Wenhua , Liu, Shiqi , Zhao, Chen , Li, Qingtian , Gao, Yibo et al. High-Energy Earth-Abundant Cathodes with Enhanced Cationic/Anionic Redox for Sustainable and Long-Lasting Na-Ion Batteries . | ADVANCED MATERIALS , 2024 , 36 (33) . |
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摘要 :
Manganese-based cathode materials have garnered extensive interest because of their high capacity, superior energy density, and tunable crystal structures. Despite their cost-effectiveness, challenges like Mn dissolution and gas evolution originating from the irreversible structural degradation pose risks to stability and prolonged electrochemical behaviors, ultimately constraining their practical applications and market prospects. While the material characteristics and redox mechanisms of Mn-based cathodes are extensively investigated, a systematic iterative approach to material design that balances performance and application demands remains both necessary and urgent. Recent strategies for enhancing cathode performances emphasize the innovative introduction and customization of composite structures in Mn-based cathode materials to address the challenges above. This review aims to provide a comprehensive understanding of composite-structure construction methodologies and offers practical guidelines for effectively designing high-stability Mn-based composite-structure cathode materials. This encompasses the classifications of composite scales, the discussions for the extent of composite-structure construction inside and outside of the cathode grains, and an exploration of the development potential of these materials, especially for grid-scale applications.
关键词 :
Mn-based cathodes Mn-based cathodes lithium manganese iron phosphate lithium manganese iron phosphate composite structures composite structures grid-scale applications grid-scale applications lithium-ion battery lithium-ion battery Mn-based lithium-rich layered oxides Mn-based lithium-rich layered oxides
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GB/T 7714 | Liu, Shiqi , Wang, Yulong , Du, Haozhe et al. Manganese-Based Composite-Structure Cathode Materials for Sustainable Batteries [J]. | ADVANCED ENERGY MATERIALS , 2024 . |
MLA | Liu, Shiqi et al. "Manganese-Based Composite-Structure Cathode Materials for Sustainable Batteries" . | ADVANCED ENERGY MATERIALS (2024) . |
APA | Liu, Shiqi , Wang, Yulong , Du, Haozhe , Li, Yuming , Wang, Yinzhong , Wang, Guoqing et al. Manganese-Based Composite-Structure Cathode Materials for Sustainable Batteries . | ADVANCED ENERGY MATERIALS , 2024 . |
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摘要 :
一种表面掺杂梯度富锂正极材料的原子层沉积的制备方法,属于锂离子电池正极材料领域。该方法使用原子层沉积技术在梯度富锂正极材料构筑均匀的表面层,并通过调控沉积过程中的参数调节表面层厚度。将包覆后的梯度富锂材料进行热处理,实现表面掺杂。本发明通过表界面处理,可以进一步提升梯度富锂材料的首圈库伦效率和循环性能,且工艺较为简单,可选元素丰富,对电池正极的改性研究具有重要的意义。
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GB/T 7714 | 尉海军 , 杨灏天 . 一种表面掺杂梯度富锂正极材料的原子层沉积的制备方法 : CN202310267632.3[P]. | 2023-03-15 . |
MLA | 尉海军 et al. "一种表面掺杂梯度富锂正极材料的原子层沉积的制备方法" : CN202310267632.3. | 2023-03-15 . |
APA | 尉海军 , 杨灏天 . 一种表面掺杂梯度富锂正极材料的原子层沉积的制备方法 : CN202310267632.3. | 2023-03-15 . |
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摘要 :
一种富锂正极材料的低成本表面钛掺杂方法,属于锂离子电池正极材料领域。具体包括以下步骤:将正极材料置入特定pH的溶液中,再向其中滴加硫酸氧钛水溶液并不断搅拌。反应一定时间后过滤得到固体粉末,烘干后在高温下进行烧结,最终得到钛表面掺杂正极材料。本发明所制得的表面钛掺杂的富锂正极材料提高了首圈库伦效率、放电比容量和循环性能,且工艺简单、成本较有机钛源更加低廉,适用于大批量处理富锂正极材料,可满足对动力电池的使用需求,具有很好的应用前景。
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GB/T 7714 | 尉海军 , 杨灏天 . 一种富锂正极材料的低成本表面钛掺杂方法 : CN202310252632.6[P]. | 2023-03-15 . |
MLA | 尉海军 et al. "一种富锂正极材料的低成本表面钛掺杂方法" : CN202310252632.6. | 2023-03-15 . |
APA | 尉海军 , 杨灏天 . 一种富锂正极材料的低成本表面钛掺杂方法 : CN202310252632.6. | 2023-03-15 . |
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摘要 :
一种基于硫/硒阳离子反应的高电压铝‑硫/硒电池,属于铝离子电池技术领域。实现硫/硒阳离子氧化/还原反应的高电压铝‑硫/硒电池,包括以下技术方案:(1)铝‑硫/硒电池结构依次包括SeSx/C复合正极、隔膜、电解液、Al负极,其中SeSx/C复合正极选用硫、硒单质或硫硒化合物与碳材料复合;(2)对步骤(1)所得铝‑硫/硒电池在0.1‑2.5V(vs.Al3+/Al)之间进行可逆充放电,充放电过程中发生涉及S和Se阳离子的多电子转移,最高放电比容量可达1700mAh g‑1,放电电压平台≥1.5V(vs.Al3+/Al)。
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GB/T 7714 | 尉海军 , 李帅霞 , 张旭 et al. 一种基于硫/硒阳离子反应的高电压铝-硫/硒电池 : CN202310267884.6[P]. | 2023-03-14 . |
MLA | 尉海军 et al. "一种基于硫/硒阳离子反应的高电压铝-硫/硒电池" : CN202310267884.6. | 2023-03-14 . |
APA | 尉海军 , 李帅霞 , 张旭 , 楚维钦 . 一种基于硫/硒阳离子反应的高电压铝-硫/硒电池 : CN202310267884.6. | 2023-03-14 . |
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摘要 :
一种高离子电导率聚合物基复合固态电解质的制备及应用,属于锂离子电池电解质技术领域。本发明选用碳酸酯基聚合物、导电锂盐、多孔支撑材料、功能化硅烷偶联剂和无机离子导体材料复合制备有机无机复合固态电解质。聚碳酸酯基聚合物电解质具有高的离子电导率、宽的电化学窗口和高的离子迁移数;功能化的硅烷偶联剂能与聚合物及无机材料之间形成化学键和相互作用,起到聚合物和无机填料之间的桥梁作用,从而提高聚合物电解质的离子电导率和拓宽它的电化学窗口,改善固态电解质与正负极的界面接触,从而提高锂离子电池的充放电性能。适用于高电压正极材料的锂离子固态电池。
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GB/T 7714 | 尉海军 , 吴玲巧 . 一种高离子电导率聚合物基复合固态电解质的制备及应用 : CN202310005768.7[P]. | 2023-01-01 . |
MLA | 尉海军 et al. "一种高离子电导率聚合物基复合固态电解质的制备及应用" : CN202310005768.7. | 2023-01-01 . |
APA | 尉海军 , 吴玲巧 . 一种高离子电导率聚合物基复合固态电解质的制备及应用 : CN202310005768.7. | 2023-01-01 . |
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摘要 :
原位构筑超薄无定形纳米包覆层材料的方法,涉及锂离子电池用正极材料技术领域。本发明分别通过溶胶凝胶法、共沉淀法以及电沉积结合水热法对Li2MnO3正极材料进行包覆处理,将LixMnOy无定形纳米结构均匀,完整的包覆在Li2MnO3正极材料表面(LixMnOy@Li2MnO3),其中LixMnOy为非晶无定形包覆层,厚度为0.1‑10nm;本发明通过在Li2MnO3正极材料表面包覆超薄无定形的LixMnOy,在保证该材料高放电比容量的同时并显著抑制了Li2MnO3的电压衰减,将其组装为扣式电池测试性能后发现包覆后的Li2MnO3材料在50圈充放电循环后的电压衰减为零。
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GB/T 7714 | 尉海军 , 万界 , 刘世奇 . 原位构筑超薄无定形纳米包覆层材料的方法 : CN202310318577.6[P]. | 2023-03-28 . |
MLA | 尉海军 et al. "原位构筑超薄无定形纳米包覆层材料的方法" : CN202310318577.6. | 2023-03-28 . |
APA | 尉海军 , 万界 , 刘世奇 . 原位构筑超薄无定形纳米包覆层材料的方法 : CN202310318577.6. | 2023-03-28 . |
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摘要 :
一种氧化还原介质降低氧化锂复合正极材料电压极化方法,可有效改善基于Li2O复合正极材料的封闭型锂离子电池,属于电化学储能技术领域。本申请中,氧化还原介质为LiI等碘化物,能够有效降低Li2O充放电过程中的电压极化,解决因Li2O自身导电性差带来的电压滞后问题。本申请提供的技术具有便捷、快速、低成本、易放大等优势,具有较好的应用前景,有助于进一步推动氧化锂复合正极材料的实际应用,对于高能锂离子电池的发展具有良好的促进作用。
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GB/T 7714 | 张旭 , 吴海鹏 , 尉海军 . 一种氧化还原介质降低氧化锂复合正极材料电压极化方法 : CN202310165991.8[P]. | 2023-02-21 . |
MLA | 张旭 et al. "一种氧化还原介质降低氧化锂复合正极材料电压极化方法" : CN202310165991.8. | 2023-02-21 . |
APA | 张旭 , 吴海鹏 , 尉海军 . 一种氧化还原介质降低氧化锂复合正极材料电压极化方法 : CN202310165991.8. | 2023-02-21 . |
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摘要 :
一种富锂正极锂离子电池的低浓度电解液,属于电化学储能技术领域。所述电解液包含一种或两种锂盐、链状碳酸酯溶剂和环状碳酸酯溶剂的混合溶剂及低极性的共溶剂,其中锂盐的整体浓度为0.1~0.8mol/L,共溶剂为弱溶剂化的氟化溶剂。该电解液与传统电解液(1mol/L)相比具有更低的浓度,可以显著降低电解液的粘度、提高锂离子的扩散系数、改善电解液的浸润性。通过锂盐组分、溶剂及共溶剂构成的合理设计能够调控电解液的溶剂化结构、优化界面化学结构。本发明实现了富锂正极锂离子电池与低浓度电解液的良好兼容,获得了优异的循环稳定性和倍率性能。
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GB/T 7714 | 尉海军 , 朱倩文 , 梁媛 . 一种富锂正极锂离子电池的低浓度电解液 : CN202310317590.X[P]. | 2023-03-28 . |
MLA | 尉海军 et al. "一种富锂正极锂离子电池的低浓度电解液" : CN202310317590.X. | 2023-03-28 . |
APA | 尉海军 , 朱倩文 , 梁媛 . 一种富锂正极锂离子电池的低浓度电解液 : CN202310317590.X. | 2023-03-28 . |
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