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| 1 | 钛铌氧化物用于锂离子电池负极的研究进展显示文摘钛铌氧化物(TNO)负极材料因其具有较高的比容量、安全的嵌锂电位、快速嵌锂通道和稳定的嵌锂结构已成为当前高功率、长寿命锂离子动力电池负极首选材料之一。然而,其较低的电子电导率限制了TNO负极材料高倍率性能的发挥。本文通过对近期相关研究的探讨,综述了TNO的结构特点、制备方法及改性策略,着重讨论了几种不同Ti/Nb比例材料的晶体结构及其氧化还原与插层赝电容的协同嵌锂机制,阐明其快速导锂机理;同时介绍了固相反应法、溶胶凝胶法、静电纺丝法、模板法和溶剂热法等几种TNO材料先进制备工艺及各自优势;重点分析了元素掺杂、缺陷设计以及与导电材料复合等改性方案对TNO电子传导特性的影响和对电化学性能的改善效果。最后,本文还对TNO作为负极材料在锂离子全电池和混合锂离子电容器两种储能体系中的研究现状、存在问题及应用前景进行了分析和阐述。综合分析表明,在TNO的改性方案中,元素掺杂和缺陷设计可以改变TNO的电子结构,导电材料复合结构设计可为其构建多维电子通路,而多种改性方案的迭代可明显提高TNO材料的倍率性能和循环稳定性,有望使其在高功率储能器件中获得良好应用。 | 孙德旺 蒋必志 袁涛 郑时有 | 2021 | 储能科学与技术2021，10，6： | 2 |
| 2 | Li Ion Exchanged a-MnO2 N anowires as Efficient Catalysts for Li-O2 Batteries显示文摘Due to the limited energy densities,which could be achieved by lithium-ion cells,Li-O2 batteries,which could provide a promising super energy storage medium,attract much attention nowadays.For its high activity,high storage and low cost,Mn-based oxides have shown versatile application in various batteries.To enhance the cyclability of Li-O2 batteries,here,we synthesized a kind of a-MnO2 nanowires as a bifunctional catalyst for Li-O2 batteries.The particular structure of a-MnO2 reduces the mass transfer resistance of the battery,and the MnO2 nanowires were ion ex-changed by saturated lithium sulfate solution so as to further improve the performance of the catalyst.The exchanged a-MnO2 catalyst showed a high discharge specific capacity(6243 mA·h/g at a current density of 200 mA/g)and signifi-cantly improved the cyclability up to the 55th cycle(200 mA/g with capacity of 1000 mA h/g).The results show that the Li ion exchange method is a promising strategy for improving the performance of MnO2 catalyst for Li-O2 batteries. | MA Jie ZHANG Yu YUAN Mengwei NAN Caiyun | 2020 | Chemical Research in Chinese Universities2020，36，6： | 0 |
| 3 | Optimal geometrical configuration and oxidation state of cobalt cations in spinel oxides to promote the performance of Li-O_(2) battery显示文摘Co_(3)O_(4) is considered as one of promising cathode catalysts for lithium oxygen(Li-O_(2))batteries,which contains both tetrahedral Co^(2+)sites(Co^(2+)Td)and octahedral Co^(3+)sites(Co^(3+)Oh).It is important to reveal the effect of optimal geometric configuration and oxidation state of cobalt ion in Co_(3)O_(4) to improve the performance of Li-O_(2) batteries.Herein,through regulating the synthesis process,Co^(2+)and Co^(3+)sites in Co_(3)O_(4) were replaced with Zn and Al atoms to form materials with a unique Co site.The Li-O_(2) batteries based on ZnCo_(2)O_(4) showed longer cycle life than that of CoAl_(2)O_(4),suggesting that in Co_(3)O_(4),the Co^(3+)Oh site is a relatively better geometric configuration than Co^(2+)Td site for Li-O_(2) batteries.Theoretical calculations revealed that Co^(3+)Oh sites provide higher catalysis activity,regulating the adsorption energy of the intermediate LiO_(2) and accelerating the kinetics of the reaction in batteries,which further leads to the change of the morphology of the discharge product and ultimately improves the electrochemical performance of the batteries. | Yu Zhang Shuting Zhang Mengwei Yuan Yufeng Li Rong Liu Caiyun Nan Chen Chen | 2024 | Nano Research2024，17，1： | 0 |
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