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20μm Li metal modified with phosphate rich polymer-inorganic interphase applied in commercial carbonate electrolyte

Journal of Energy Chemistry 2023年第1期76卷 233-238,I0006页

作者： Lin Lin Wei Lu Feipeng Zhao Siru Chen Jia Liu Haiming Xie Yulong Liu School of Chemistry Northeast Normal UniversityChangchun 130024JilinChina Key Laboratory of Functional Materials Physics and Chemistry Ministry of Education Jilin Normal UniversityChangchun 130103JilinChina College of Information Technology Jilin Normal UniversitySiping 13600oJilinChina Department of Mechanical and Materials Engineering Western UniversityLondon N6A 3K7Canada

Li metal batteries are supposed to reach real application in order to fulfill the high-energy density requirement of energy storage system.Unfortunately,the commonly used carbonate electrolyte react with pristine Li,which result in short lifetime of lithium metal battery.To alleviate the side reactions of Li metal with liquid electrolyte,here we propose a phosphate rich polymer-inorganic layer as an interphase.Due to the inert properties of lithium phosphate derived from LiPO_(2)F_(2)and poly-ether,the side-reaction of carbonate solvent are prevented.As a result,lithium metal anode sustains for 800 cycles in symmetrical cell test under 1 m A cm^(-2).Even under strict condition(20μm Li,capacity ratio N/P=2.3,electrolyte/active material=3μL mg^(-1)),coin cell test still runs stable for 150 cycles with high Coulombic efficiency.Furthermore,both LiFePO_(4)and LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)pouch cell under 5μL m A^(-1)h^(-1)condition also exhibit good stability at 0.5 C and 2 C rate.With this approach,high-energy and high-power Li metal batteries are approaching to real application in the near future.

关键词： lithium metal anode lithium phosphate Ultra-thin lithium Solid electrolyte interphase

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Tuning Li_(3)PO_(4)modification on the electrochemical performance of nickel-rich LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1488-1496页

作者： Zhi-kun Zhao Hui-lin Xie Zi-yue Wen Ling Liu Bo-rong Wu Shi Chen Dao-bin Mu Chao-xiang Xie School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Guangdong Key Laboratory of Battery Safety Guangzhou Institute of Energy TestingGuangzhou 511447China Sinoma Synthetic Crystals Co. Ltd.Beijing 100018China Department Shanghai Institute of Space Power-Sources Shanghai 200245China

Surface deterioration occurs more easily in nickel-rich cathode materials with the increase of nickel content.To simultaneously pre-vent deterioration of active cathode materials and improve the electrochemical performance of the nickel-rich cathode material,the surface of nickel-rich LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)cathode material is decorated with the stable structure and conductive Li_(3)PO_(4)by a facile method.The LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)-1wt%,2wt%,3wt%Li_(3)PO_(4)samples deliver a high-capacity retention of more than 85%after 100 cycles at 1 C under a high voltage of 4.5 V.The effect of different coating amounts(0-5wt%)for the LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)cathode is analyzed in detail.Results show that 2wt%coating of Li_(3)PO_(4)gives better performance compared to other coating concentrations.Detailed analysis of the structure of the samples during the charge−discharge process is performed by in-situ X-ray diffraction.It is indicated that the modification for LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)cathode could protect the well-layered structure under high voltages.In consequence,the electrochemical performance of modified samples is greatly improved.

关键词： nickel rich lithium phosphate coating high voltage

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