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A New PAA Sol-Gel Method to Synthesis the Spinel LiMn_2O_4 Material for Li-ion Battery 被引量:2
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作者 Zhan Hui, Zhou Yun-hong College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, China 《Wuhan University Journal of Natural Sciences》 CAS 2002年第1期97-101,共5页
A PAA sol-gel method, which is based on the chelate effect of PAA polymer, was developed for the synthesis of the spinel LiMn 2O 4 material. The pyrolysis process of the PAA-nitrate mixture precursor was investigate... A PAA sol-gel method, which is based on the chelate effect of PAA polymer, was developed for the synthesis of the spinel LiMn 2O 4 material. The pyrolysis process of the PAA-nitrate mixture precursor was investigated by TG and DTA analysis. It is found that the structure and electrochemical properties of the material are sensitive to the atmosphere employed in the synthesis process. Preliminary results show that the material thus prepared has a good electrochemical performance even at high charge and discharge current. 展开更多
关键词 SOL-GEL PAA spinel material
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Effect of sintering time on the electrochemical properties of spinel LiMn_2O_4 synthesized by solid-state reaction 被引量:1
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作者 Tao Li Weihua Qiu +3 位作者 Renhua Zhao Hui Xia Hailei Zhao Jingjing Liu 《Journal of University of Science and Technology Beijing》 CSCD 2008年第1期74-78,共5页
LiMn2O4 powder as a cathode materials for rechargeable lithium-ion batteries was prepared by solid-state reaction from LitCO3 and electrolytic MnOz at different sintering periods (2, 6, 18, and 32 h). X-ray diffract... LiMn2O4 powder as a cathode materials for rechargeable lithium-ion batteries was prepared by solid-state reaction from LitCO3 and electrolytic MnOz at different sintering periods (2, 6, 18, and 32 h). X-ray diffraction (XRD) patterns of the prepared samples are identified as the spinel structure with a space group of Fd3 m. The lattice parameters almost remain the same as the sintering periods increase. The sample with a sintering period of 32 h shows good cycling performance at both low and nigh current densities, and also elevated temperature. It is believed that the excellent electrochemical behavior of this sample results from its good crystallinity and large grain size compared with other samples. Different electrochemical measurements were conducted to investigate the electrochemical properties of spinel LiMn204. 2008 University of Science and Technology Beijing. All rights reserved. 展开更多
关键词 cathode material spinel LiMn204 sintering period microstructure electrochemical properties
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Influence of Pore Forming Agent on Properties of Micro-pored CA_6-MA Material
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作者 LI Chunming ZHOU Ningsheng BI Yubao 《China's Refractories》 CAS 2013年第2期24-28,共5页
Micro-pored CA6 -MA lightweight material with CAM: MA mass ratio of 7:3 was prepared using Al(OH) 3, MgCO3 and CaCO3 as starting materials, and anthracite. sweet potato starch and anthracite + sweet potato starch... Micro-pored CA6 -MA lightweight material with CAM: MA mass ratio of 7:3 was prepared using Al(OH) 3, MgCO3 and CaCO3 as starting materials, and anthracite. sweet potato starch and anthracite + sweet potato starch as pore forming agent (PFA) with an addition of 10 mass%, 20 mass% and 30 mass%, respectively. The starting materials were dry mixed, wet co-milled in a ball mill for 1 h. slip cast into cylindrical specimens with a diameter of 60 ram. and then calcined at 1 450 ℃ for 3 h. With the increase of PFA addition,, apparent porosity increases, and bulk density decreases. The influence of different PFAs on properties of the micro-pored LW CAM -MA aggregate was investigated. The achieved CAM - MA, by adding 30% sweet potato starch, has a porosity of 76. 8%, bulk density of 0. 78 g · cm^ - 3 and median pore size of 1.90 μm. 展开更多
关键词 micro-pored material calcium hexaluminate spinel pore forming agent lightweight aggregate refractory
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LiMn_2O_4/CNTs and LiNi_(0.5)Mn_(1.5)O_4/CNTs Nanocomposites as High-Performance Cathode Materials for Lithium-Ion Batteries
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作者 Thang Van Le Ha Tran Nguyen +2 位作者 Anh Tuan Luu Man Van Tran Phung Loan My Le 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第1期122-128,共7页
The demand of higher energy density and higher power capacity of lithium(Li)-ion secondary batteries has led to the search for electrode materials whose capacities and performance are better than those available tod... The demand of higher energy density and higher power capacity of lithium(Li)-ion secondary batteries has led to the search for electrode materials whose capacities and performance are better than those available today. Carbon nanotubes(CNTs), with their unique properties such as 1D tubular structure, high electrical and thermal conductivities, and extremely large surface area, have been used as materials to prepare cathodes for Li-ion batteries. The structure and morphology of CNTs were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The functional groups on the purified CNT surface such as –COOH, –OH were characterized by Fourier Transform infrared spectroscopy. The electrode materials were fabricated from LiMn2O4(LMO), doped spinel LiNi0.5Mn1.5O4, and purified CNTs via solid-state reaction. The structure and morphology of the electrode were characterized using XRD, SEM, and TEM. Finally, the efficiency of the electrode materials using CNTs was evaluated by cyclic voltammetry and electrochemical impedance spectroscopy. 展开更多
关键词 Nanocomposites Carbon nanotubes(CNTs) spinel materials Lithium-ion batteries(LIBs)
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High capacity lithium-manganese-nickel-oxide composite cathodes with low irreversible capacity loss and good cycle life for lithium ion batteries 被引量:1
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作者 Jingwen Zhang Xun Guo +1 位作者 Sumei Yao Xinping Qiu 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第11期1479-1485,共7页
We report a method to eliminate the irreversible capacity of 0.4Li_2MnO_3·0.6LiNi_(0.5)Mn_(0.5)O_2(Li_(1.17)Ni_(0.25)Mn_(0.583)O_2) by decreasing lithium content to yield integrated layered-spinel structures.XRD ... We report a method to eliminate the irreversible capacity of 0.4Li_2MnO_3·0.6LiNi_(0.5)Mn_(0.5)O_2(Li_(1.17)Ni_(0.25)Mn_(0.583)O_2) by decreasing lithium content to yield integrated layered-spinel structures.XRD patterns,High-resolution TEM image and electrochemical cycling of the materials in lithium cells revealed features consistent with the presence of spinel phase within the materials.When discharged to about 2.8 V,the spinel phase of LiM_2O_4(M=Ni,Mn) can transform to rock-salt phase of Li_2M_2O_4(M=Ni,Mn) during which the tetravalent manganese ions are reduced to an oxidation state of 3.0.So the spinel phase can act as a host to insert back the extracted lithium ions(from the layered matrix) that could not embed back into the layered lattice to eliminate the irreversible capacity loss and increase the discharge capacity.Their electrochemical properties at room temperature showed a high capacity(about 275 mAh g^(-1) at 0.1 C) and exhibited good cycling performance. 展开更多
关键词 Lithium ion electrode composite materials Lithium-rich material spinel phase layered phase
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