Nickel-rich layered materials,such as LiNi_(0.8)0Co_(0.15)Al_(0.05)O_2(NCA),have been considered as one alternative cathode materials for lithium-ion batteries(LIBs) due to their high capacity and low cost.However,the...Nickel-rich layered materials,such as LiNi_(0.8)0Co_(0.15)Al_(0.05)O_2(NCA),have been considered as one alternative cathode materials for lithium-ion batteries(LIBs) due to their high capacity and low cost.However,their poor cycle life and low thermal stability,caused by the electrode/electrolyte side reaction,prohibit their prosperity in practical application.Herein,AlPO4 has been homogeneously coated on the surface of NCA via wet chemical method towards the target of protecting NCA from the attack of electrolyte.Compared with the bare NCA,NCA@AlPO_4 electrode delivers high capacity without sacrificing the discharge capacity and excellent cycling stability.After 150 cycles at 0.5 C between 3.0-4.3 V,the capacity retention of the coated material is 86.9%,much higher than that of bare NCA(66.8%).Furthermore,the thermal stability of cathode is much improved due to the protection of the uniform coating layer on the surface of NCA.These results suggest that AlPO4 coated NCA materials could act as one promising candidate for next-generation LIBs with high energy density in the near future.展开更多
SiC窑具材料浸渍Ca3(PO4)2与AlPO4混合饱和溶液,能填充气孔,降低气孔率,阻碍O2的扩散,能增加SiC窑具抗氧化性,延长其使用寿命.浸渍次数越多,氧化速度越小.浸渍1～4次的氧化速度常数比值为:Ki混:K2混:K3混:K4混=1.44×10-7:1.16 x 10...SiC窑具材料浸渍Ca3(PO4)2与AlPO4混合饱和溶液,能填充气孔,降低气孔率,阻碍O2的扩散,能增加SiC窑具抗氧化性,延长其使用寿命.浸渍次数越多,氧化速度越小.浸渍1～4次的氧化速度常数比值为:Ki混:K2混:K3混:K4混=1.44×10-7:1.16 x 10-7:1.02×10 7:0.87×107=1.66:1.33:1.1 7:1,浸渍混合饱和溶液的抗氧化能力比浸渍Ca3(PO4)2饱和溶液强.展开更多
A tunable luminescence from red to blue in Eu-doped mesoporous AIPO4 glass is achieved by adjusting the annealing temperature. With increasing annealing temperature, the increased Eu^3＋ ions reduction changes the lum...A tunable luminescence from red to blue in Eu-doped mesoporous AIPO4 glass is achieved by adjusting the annealing temperature. With increasing annealing temperature, the increased Eu^3＋ ions reduction changes the luminescence of the obtained glass. The abnormal reduction of Eu^3＋ to Eu^2＋ occurs in A1PO4 mesoporous glass at relative low annealed temperatures from 600 to 800 ~C in air. The presence of Eu^2＋ ions, which are reduced from Eu^3＋ by hole-electron pairs, is revealed by XPS spectra. Our results indicate the mesoporous AlPO4 glass is a suitable matrix to incorporate Eu ions as the tunable luminescent light sources or LEDs.展开更多
基金supported by the National Natural Science Foundation of China(21303222,21127901,51303132)the National Key Research and Development Program of China(2016YFA0202500)the'Strategic Priority Research Program'of the Chinese Academy of Sciences(XDA09010100)
文摘Nickel-rich layered materials,such as LiNi_(0.8)0Co_(0.15)Al_(0.05)O_2(NCA),have been considered as one alternative cathode materials for lithium-ion batteries(LIBs) due to their high capacity and low cost.However,their poor cycle life and low thermal stability,caused by the electrode/electrolyte side reaction,prohibit their prosperity in practical application.Herein,AlPO4 has been homogeneously coated on the surface of NCA via wet chemical method towards the target of protecting NCA from the attack of electrolyte.Compared with the bare NCA,NCA@AlPO_4 electrode delivers high capacity without sacrificing the discharge capacity and excellent cycling stability.After 150 cycles at 0.5 C between 3.0-4.3 V,the capacity retention of the coated material is 86.9%,much higher than that of bare NCA(66.8%).Furthermore,the thermal stability of cathode is much improved due to the protection of the uniform coating layer on the surface of NCA.These results suggest that AlPO4 coated NCA materials could act as one promising candidate for next-generation LIBs with high energy density in the near future.
文摘SiC窑具材料浸渍Ca3(PO4)2与AlPO4混合饱和溶液,能填充气孔,降低气孔率,阻碍O2的扩散,能增加SiC窑具抗氧化性,延长其使用寿命.浸渍次数越多,氧化速度越小.浸渍1～4次的氧化速度常数比值为:Ki混:K2混:K3混:K4混=1.44×10-7:1.16 x 10-7:1.02×10 7:0.87×107=1.66:1.33:1.1 7:1,浸渍混合饱和溶液的抗氧化能力比浸渍Ca3(PO4)2饱和溶液强.
基金financially supported by the National Natural Science Foundation of China(Nos.51072207 and 61275208)the Shanghai Natural Science Foundation(No.11ZR1441500)Li acknowledges the financial support from National Youth Natural Science Foundation of China(No.61108062)
文摘A tunable luminescence from red to blue in Eu-doped mesoporous AIPO4 glass is achieved by adjusting the annealing temperature. With increasing annealing temperature, the increased Eu^3＋ ions reduction changes the luminescence of the obtained glass. The abnormal reduction of Eu^3＋ to Eu^2＋ occurs in A1PO4 mesoporous glass at relative low annealed temperatures from 600 to 800 ~C in air. The presence of Eu^2＋ ions, which are reduced from Eu^3＋ by hole-electron pairs, is revealed by XPS spectra. Our results indicate the mesoporous AlPO4 glass is a suitable matrix to incorporate Eu ions as the tunable luminescent light sources or LEDs.
