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Studies on Controlled Crystallization Preparation for LiMn2O4

Studies on Controlled Crystallization Preparation for LiMn2O...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： ZHU Hua-li CHEN Zhao-yong Department of materials Science and Engineering Changsha University of Science and Technology China

＜正＞Spinel LiMn2O4 was regarded as one of the most promising cathode materials for lithium ion batteries in virtue of its obvious advantages such as abundant and cheap resources, environmental benignity, safety, high voltage and good rate capability. But it is the disadvantages of structural instability and rapidly capacity fading that holdback its application on a large scale. It is well known the morphology of the materials plays an important role to its performance. The compound prepared

关键词： spherical lithium ion batteries cathode materials spinel LiMn2O4

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Preparation of LiMnxFe1-xPO4 Composites with dual coating carbon by hydrothermal method

Preparation of LiMnxFe1-xPO4 Composites with dual coating ca...

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河南省化学会2018年学术年会

作者： Yuanchao Li Guangri Xu Xiaokun Shang Jingjing Ma Erqing Zhao Xiaohui Shi School of Chemistry and Chemical Engineering Henan Institute of Science and Technology

Li FePO suffers from a lower energy density, and LiMnPO suffers from poor electronic and ionic conductivity. Iron-substituted Li MnPO(LiMnxFe-xPO) composites can complement each others shortcomings and synergistically increase the material’s energy density and power density. In this paper, the graphene and sucrose were used as the double carbon source to increase the electronic conductivity and ion diffusion of Li MnxFe-xPO,. The precursors with dual carbon layers were prepared by the improved hydrothermal method, followed by thermal conversion under high temperature. The effects of the coating carbon, lithium content, and the reaction solvent on the structure and electrical properties of the material was investigated. The results showed that when the molar ratio of Li:M(Fe+Mn):P was 1:1:3 with ethylene glycol as solvent, the Li MnxFe-xPO@C with double carbon layer possessed the best electrochemical performance with a specific discharge capacity of 120 m Ah/g at 0.1 C. and capacity retention with about 85% after 50 cycles. The excellent electrochemical performance is mainly attributed to the coating the double carbon layer, the dispersibility of the ethylene glycol, and the appropriate lithium content.

关键词： LiMnPO4 cathode materials Li ion batteries Hydrothermal method

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Facile synthesis of one-dimensional hierarchical LiNi0.8Co0.15Al0.05O2 microrods: towards better rate and cycle performance for Li ion batteries

Facile synthesis of one-dimensional hierarchical LiNi0.8Co0....

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河南省化学会2016年学术年会

作者： Nai-Teng Wu Xian-Ming Liu Hong-Ru Fu Zhan Zhou Lu-fang Ma College of Chemistry and Chemical Engineering and Henan Key laboratory of Function-Oriented Porous Materials Luoyang Normal University

One-dimensional hierarchical LiNiCoAlO microrods are synthesized through lithiation of mixed Ni, Co and Al oxalate microrods obtained via a two-step co-precipitation route. CoCO·2HO microrods were prepared firstly, and used as a crystallite seed to allow the formation of MCO·2HO(M= Ni, Co and Al) microrods. The uniform hierarchical porous rod-like morphology endows the LiNiCoAlO microrods with superior high rate capability and cycling performance for highly reversible lithium storage. They deliver high specific discharge capacity of 212 and 109 m Ah/g at the rate of 0.1 and 10 C, respectively. At 1 C, they achieve a discharge capacity of 170 m Ah/g and without capacity fading after 100 cycles at room temperature. The excellent electrochemical performance can be attributed to the novel hierarchical microrods with larger contact area between electrolyte and electrode which ascribed to increase surface area, and simultaneously shorten diffusion path of the electron and Li ion.

关键词： hierarchical structure microrods i Ni0.8Co0.15Al0.05O2 cathode materials lithium ion batteries

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MOFs as sulfur storage materials in Li-S batteries

MOFs as sulfur storage materials in Li-S batteries

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中国化学会第九届全国无机化学学术会议

作者： Junwen Zhou Xingguo Li Beijing National Laboratory for Molecular Sciences （BNLMS） The State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University

We present here the use of metal-organic frameworks（MOFs） as sulfur hosts in lithium-sulfur（Li-S） batteries. We first compared the host properties of four distinct MOFs（MIL-53, NH2-MIL-53, HKUST-1 and ZIF-8）, and studied the effects of the window size, shape, unsaturated metal sites and function groups of the MOF pores on performance（cycling stability and rate capacity）, and electrochemical kinetics（charge transfer and internal diffusion）. We successfully obtained an effective MOF host, ZIF-8, which gives the best cycling performance. Then we chose ZIF-8 as a prototype and selectively synthesized five sets of ZIF-8 with different particle sizes（from ＜ 20 nm to ＞ 1 μm） to systematically study the effect of the particle size of a porous host on battery performance. The results show that there is an optimal selection of particle size for a given host to maximize the utilization of sulfur without sacrificing the capacity retention.

关键词： electrochemical energy storage Li-S batteries cathode materials porous materials sulfur hosts

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High-rate capability and excellent cycling stability of Li3V2(PO4)3/C cathode material prepared via solgel combined with ball milling method

High-rate capability and excellent cycling stability of Li3V...

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2014中国功能材料科技与产业高层论坛

作者： Yun-fei Long Qing-hua Xiao Jing Su Yi-ju LV Xiao-yan Lv Yan-xuan Wen School of Chemistry and Chemical Engineering Guangxi University

LiV(PO)/C is prepared by sol-gel combined with ball milling method(SG-BM).The composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),C-S analysis and galvanostatic charge/discharge measurements.The structural characterization shows that the composite prepared by SG-BM is composed of the well crystallized LiV(PO) with the space group P21/n and 6.2wt.%amorphous carbon.SEM and TEM results show that theprepared composite has uniform size distribution with the narrow range of 0.5-1.5μm,and its surface is covered by a smooth and uniform carbon layer with thickness of about 10nm.Galvanostatic charge/discharge measurements indicate that the composite exhibits high rate capability and excellent cycling stability.The prepared composite delivers a discharge capacity of 131.1mAh/g,128.9mAh/g,122.6mAh/g and 113.8mAh/g at 0.5C,1C,and 10C,respectively.The capacity retention of 100%is achieved after 50cycles at 1C.This outstanding electrochemical capability is attributed to the ultrafine particles with narrow size distribution and the well-covered carbon layer with proper thickness.

关键词： Lithium ion batteries cathode materials Li3V2（PO4）3/C Sol-gel

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