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| 1 | Design aspects of electrolytes for fast charge of Li-ion batteries显示文摘The electrolytes of Li-ion batteries consist mainly of a LiPF6 salt dissolved in a carbonate-based solvent mixture.Such electrolytes cannot support fast charge without detrimental impacts on performance and lifetime.Fast charge aggravates parasitic reactions of the electrolyte solvents and structural degradation of the lithium layered transition metal oxide cathode materials.This leads to not only the depletion of electrolyte solvents but also the loss of cyclable Li+ions,accompanied by impedance growth and volumetric swelling of the battery.In this perspective,the design aspects of the electrolytes for fast charge of Li-ion batteries are discussed and proposed. | Sheng S.Zhang | 2021 | InfoMat2021，3，1： | 5 |
| 2 | Designing safer lithium-based batteries with nonflammable electrolytes:A review显示文摘Lithium-based batteries have had a profound impact on modern society through their extensive use in portable electronic devices,electric vehicles,and energy storage systems.However,battery safety issues such as thermal runaway,fire,and explosion hinder their practical application,especially for using metal anode.These problems are closely related to the high flammability of conventional electrolytes and have prompted the study of flameretardant and nonflammable electrolytes.Here,we review the recent research on nonflammable electrolytes used in lithium-based batteries,including phosphates,fluorides,fluorinated phosphazenes,ionic liquids,deep eutectic solvents,aqueous electrolytes,and solid-state electrolytes.Their flame-retardant mechanisms and efficiency are discussed,as well as their influence on cell electrochemical performance.We conclude with a summary of future prospects for the design of nonflammable electrolytes and the construction of safer lithium-based batteries. | Shichao Zhang Siyuan Li Yingying Lu | 2021 | eScience2021，1，2： | 5 |
| 3 | Decoding lithium batteries through advanced in situ characterization techniques显示文摘Given the energy demands of the electromobility market,the energy density and safety of lithium batteries(LBs)need to be improved,whereas its cost needs to be decreased.For the enhanced performance and decreased cost,more suitable electrode and electrolyte materials should be developed based on the improved understanding of the degradation mechanisms and structure–performance correlation in the LB system.Thus,various in situ characterization technologies have been developed during the past decades,providing abundant guidelines on the design of electrode and electrolyte materials.Here we first review the progress of in situ characterization of LBs and emphasize the feature of the multi-model coupling of different characterization techniques.Then,we systematically discuss how in situ characterization technologies reveal the electrochemical processes and fundamental mechanisms of different electrode systems based on representative electrode materials and electrolyte components.Finally,we discuss the current challenges,future opportunities,and possible directions to promote in situ characterization technologies for further improvement of the battery performance. | Mei Yang Ruyi Bi Jiangyan Wang Ranbo Yu Dan Wang | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，5： | 4 |
| 4 | 废旧磷酸铁锂电池的正负极同步再利用策略显示文摘考虑到废旧锂离子电池对环境、资源和全球可持续性发展存在严重的威胁和挑战,有必要开发出合适的回收技术实现废旧锂离子电池的回收和再利用.因此,我们提出了一种全新的绿色高效的直接回收方法,实现了废旧磷酸铁锂电池中正极LiFePO_(4)(LFP)和负极石墨的双重回收,并将其按不同比例复合设计了一种新型双离子电池(DIB)的复合正极材料(LiFePO_(4)/石墨,简写为LFPG).这种复合正极能够实现阴离子和阳离子的共同参与脱嵌,从而贡献更高的容量.结合LFP的高容量、高稳定性和石墨的高导电性、高电压性,这种复合正极表现出优异的电化学性能.在不同配比的复合材料中,LFP:graphite=3:1的复合材料在25mAg^(-1)的电流密度下展示出接近130 mAhg^(-1)的可逆容量,达到4.95 V的高电压平台,并表现出优异的循环性能(在100mAg^(-1)的电流密度下进行700次循环后仍具有良好的容量保持率),倍率性能相比回收的单一LiFePO_(4)也得到明显提升.通过电极动力学研究,揭示了Li^(+)和PF_(6)^(-)在复合正极中的特定扩散行为,进一步阐明了DIB的阴/阳离子分阶段嵌入/脱出的工作机理.本研究为废旧锂离子电池正极和负极材料的大规模回收提供了一种新的策略,并为利用废锂离子电池设计出性能优良的新型复合型锂离子电池正极材料提供了指导. | 杜凯迪 孟云峰 赵欣欣 王晓彤 罗晓曦 张薇 吴兴隆 | 2022 | Science China Materials2022，65，3： | 2 |
| 5 | 有机磷酸酯阻燃电解液的研究进展显示文摘随着锂离子电池的市场拓展,安全性问题已成为电动汽车、大规模储能等应用领域关注的首要问题.目前商品化的锂离子电池普遍采用低沸点碳酸酯类电解液,其易燃性成为电池不安全性的主要隐患.为了提高锂离子电池的本征安全性,阻燃或不燃性电解液成为近年来研究的热点,其中以磷酸酯为溶剂的阻燃型或不燃型电解液受到广泛关注.本文主要介绍磷酸酯阻燃和不燃电解液的研究状况,分析了这类电解液与锂离子电池正负极的兼容性问题,讨论了改善磷酸酯电解液电化学兼容性的途径,提出了发展高效、安全、稳定的不燃电解液的一些思路. | 曾子琪 艾新平 杨汉西 曹余良 | 2020 | 电化学2020，26，5： | 2 |
| 6 | 高镍LiNi0.9Co0.05Mn0.05O2正极材料的形貌调控及电化学性能研究显示文摘研究氢氧化物共沉淀反应的氨浓度对Ni0.9Co0.05Mn0.05(OH)2前驱体及正极材料的影响。结果表明,高氨浓度下制备的前驱体H-NCM具有更大的一次晶粒和二次颗粒粒径,且一次晶粒有序定向生长形成高暴露{010}晶面。其正极材料H-LNCM的{010}活性晶面增大、锂镍混排降低以及锂离子扩散系数提高,从而产生优异的电化学性能。在2.7~4.3 V电压区间,0.1 C倍率下放电比容量为218.31 mAh·g^-1,5 C倍率下的放电容量为152.24 mAh·g^-1,1 C倍率下循环100次的容量保持率为76.05%,均优于L-LNCM材料。 | 李作伟 赖晶 向伟 吴振国 郭孝东 钟本和 | 2020 | 广州化工2020，48，22： | 1 |
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