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| 1 | Thermal stability of LiFePO_4/C-LiMn_2O_4 blended cathode materials显示文摘Safety is important to lithium ion battery materials. The thermal stability of LiFePO_4/C-LiMn_2O_4 blended cathode materials is characterized by using TG, XRD, and SEM etc. The results show that LiFePO_4/C-LiMn_2O_4 possesses a worse thermal stability than pure spinel LiMn_2O_4 and pure olivine LiFePO_4/C. When LiFePO_4/C-LiMn_2O_4 blended cathode materials are sintered at 500°C under Ar atmosphere, the sintered cathode materials emit O_2, and appear impurity phases(Li_3PO_4, Fe_2O_3, Mn_3O_4). It is deduced that some chemical reactions take place between different materials, which leads to a worse discharge specific capacity. LiFePO_4/C-LiMn_2O_4 blended cathode materials, therefore, need to be managed and controlled strictly for the sake of thermal stability and safety. | DU YuanChao HUANG XiaoPeng ZHANG KeYu LIANG Feng LI QiuXia YAO YaoChun DAI YongNian | 2017 | Science China(Technological Sciences)2017，60，1： | 5 |
| 2 | Crystallined Hybrid Carbon Synthesized by Catalytic Carbonization of Biomass and in-situ Growth of Carbon Nanofibers显示文摘Crystallined hybrid carbon was synthesized by the catalytic carbonization of biomass(Pinus kesiya sawdust)at1100℃and in-situ growth of carbon nanofibers(CNFs)at 750℃from acetylene.The microstructure of the composite was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),transmission electron microscopy(TEM)and high-resolution transmission electron microscopy(HRTEM).It was found that highly crystallined carbon composed of well-aligned graphene layers with interlayer spacing of 0.34 nm can be formed by catalytic carbonization of biomass.However,the structure of the in-situ growing CNFs is lessaligned.Based on the results of the investigation,the formation mechanism of the crystallined hybrid carbon was discussed.Owning to synergistic effect of the highly crystallined carbon and the conductive network formed by CNFs,the crystallined hybrid carbon shows 32.6%lower electrical resistivity than biocarbon.When being used as anode material of lithium-ion batteries(LIBs),the crystallined hybrid carbon and the biocarbon have nearly the same first coulombic efficiencies(CEs),however,the former has a discharge capacity of 67%higher than the latter since the second cycle. | Shuhe Liu Shuchun Zhao Yaochun Yao Peng Dong Chao Yang | 2014 | Journal of Materials Science & Technology2014，30，5： | 4 |
| 3 | Synthesis and characterization of LiCo x Mn2?x O4 cathode materials显示文摘 | Yaochun Yao Ph D Yongnian Dai Bin Yang Wenhui Ma Takayuki Watanabe | 2007 | Journal of Wuhan University of Technology - Mater Sci Ed2007，，2： | 1 |
| 4 | Effect of Pore Structures on the Electrochemical Performance of Porous Silicon Synthesized from Magnesiothermic Reduction of Biosilica显示文摘Two kinds of porous silicon(PS) were synthesized by magnesiothermic reduction of rice husk silica(RHS) derived from the oxidization of rice husks(RHs). One was obtained from oxidization/reduction at 500 ℃ of the unleached RHs, the other was synthesized from oxidization/reduction at 650 ℃ of the acidleached RHs. The structural difference of the above PS was compared: the former had a high pore volume(PV, 0.31 cm3/g) and a large specific surface area(SSA, 45.2 m^2/g), 138 % and 17 % higher than the latter, respectively. As anode materials for lithium ion batteries, the former had reversible capacity of 1 400.7 m Ah/g, 987 m Ah/g lower than the latter; however, after 50 cycles, the former had 64.5 % capacity retention(907 m Ah/g), which was 41.2 % higher than the latter(555.7 m Ah/g). These results showed that the electrochemical performance of PS was significantly affected by its pore structures, and low reduction temperature played the key role in increasing its porosity, and therefore improving its cycling performance. | 刘树和 LIU Bin YAO Yaochun DONG Peng ZHAO Shuchun | 2016 | Journal of Wuhan University of Technology(Materials Science)2016，31，5： | 1 |
| 5 | Investigation on in-flight melting behavior of granulated alkali-free glass raw material under different conditions with 12-phase AC arc显示文摘 | Yao Yaochun Yatsuda Kazuyuki Watanabe Takayuki | 2008 | Chemical Engineering Journal2008，144，： | 1 |
| 6 | Effect of cy- cles and ion-exchange on the purification of lithium carbonate 显示文摘 | Wu Jian Yao Yaochun Dai Yongnian | 2012 | Adv Mater Res2012，443，444： | 1 |
| 7 | Improved electrochemical performance of LiFe0.65Mn0.35PO4cathode material by using electrolytic manganese dioxide for lithium-ion battery显示文摘The olivine-type structure LiFe_(0.65)Mn_(0.35)PO_4 materials are respectively synthesized via MnO_2 and MnC_2 O_4·2 H_2 O as manganese resources by using solid-state reaction. The compound materials are characterized by scanning electron microscopies(SEM),transmission electron microscopy(TEM), X-ray photoelectronspectroscopy(XPS) and electrochemical test. The experimental results demonstrate that LiFe_(0.65)Mn_(0.35)PO_4 prepared by MnO_2 as manganese resource exhibits uniform particles with porous structure in SEM and TEM images. XPS data show the coexistence of Mn^(4+), Mn^(3+) and Mn^(2+) cations. Besides, this sample shows better discharge special capacity of 107.46 mA h g^(-1) at 5 C and capacitance conservation rate about 95.47% after 100 cycles at1 C. The superior electrochemical capability is attributed to the coexistence of mixed-valence manganese cations in crystal and the uniform particles with porous structure. | ZHOU HuangKai LU JinHua HUANG XiaoPeng DU YuanChao LIANG Feng YAO YaoChun | 2017 | Science China(Technological Sciences)2017，60，12： | 1 |
| 8 | Influence of synergistic effect of LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)@Cr_(2)O_(5)composite on the electrochemical properties显示文摘LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)@Cr_(2)O_(5)composite electrode combines the high rate-capability characteristics of NCA with the stability of Cr_(2)O_(5),playing a synergistic role in improving the cyclic stability,initial discharge capacity and the security of low cut-off voltage(2.0 V).When the mass ratio of Cr_(2)O_(5)in NCA is 45%(mass),the capacity retention rate increases from 58.5% without Cr_(2)O_(5)to 69.3% in the range of 2.0-4.3 V.The initial discharge capacity of NCA@Cr_(2)O_(5)composite material is 211.4 mA·h·g^(-1),its first coulombic efficiency is 94.2%,and the charging capacity remains approximately constant when mixed with 15%(mass)Cr_(2)O_(5).The reason for the improvement of the initial charge-discharge efficiency(ICDE)was explained.Impedance and cyclic voltammetry analysis reveal more detailed reasons of the observed improvements.Compared with NCA cathode material,the NCA@Cr_(2)O_(5)composite material can provide not only additional stable sites and channels for Li^(+)insertion/extraction to make up for the loss of active Li^(+)sites and prevent the accumulation of Li+in the circulation process,but also protect the NCA electrode from the corrosion of the electrolyte decomposition by the Cr_(2)O_(5)nanoparticles adhering to NCA interface. | Yunke Wang Yongjia Li Yenan Zhang Guozheng Zha Feng Liang Yongnian Dai Yaochun Yao | 2021 | Chinese Journal of Chemical Engineering2021，34，5： | 1 |
| 9 | Effect of Zn doping on the performance of LiMnPO 4 cathode for lithium ion batteries显示文摘 | Haisheng Fang Huihua Yi Chenglin Hu Bin Yang Yaochun Yao Wenhui Ma Yongnian Dai | 2012 | Electrochimica Acta2012，，： | 1 |
| 10 | A novel approach to synthesize porous graphene by the transformation and deoxidation of oxygen-containing functional groups显示文摘In this study,impurity-free porous graphene(PG) with intrinsic pore structure was synthesized through a facile acid-alkali etching-assisted sonication approach.The pore structure appears on the surface of graphene sheets due to intrinsic defects of graphene.The PG possessed an extremely high specific surface area of 2184 m^2/g,the size of^5 μm and layer numbers of 3-8.Additionally,PG contained micropores and mesopores simultaneously,with an average pore diameter of approximately 3 nm.The effects of acid,alkali,and ultrasound treatment on PG preparation were elucidated by transmission electron microscopy and fourier transform infrared spectroscopy.First,in an acidic solution,oxygen-containing functional groups(hydroxyls,carboxyl,and epoxides) were formed due to the hydrolysis of sulfate and continuous transformations of these functional groups on graphene oxide.Second,under the synergistic effects of alkali and ultrasound treatment,PG was obtained due to the loss of carboxyl and epoxide groups.A new route for preparing PG was provided by the proposed method. | Da Zhang Luming Chen Yaochun Yao Feng Liang Tao Qu Wenhui Ma Bing Yang Yongnian Dai Yong Lei | 2019 | Chinese Chemical Letters2019，30，12： | 0 |
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