钠离子电池正极材料Na_(0.7)MnO_2的制备及性能研究
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摘要
文章主要通过水热法和热处理来获得Na_(0. 7)MnO_2材料。该材料是纳米薄片结构,直径在200～300 nm之间,厚度约为20～30 nm左右。在电化学测试中,500℃的Na_(0. 7)MnO_2在0. 1倍率时首次放电比容量为168. 3 mAh/g,接近Na_(0. 7)MnO_2材料的理论比容量170 mAh/g。循环70圈以后,其放电比容量为161. 1 mAh/g,仅有4. 3%的容量损失,表现了优异的循环性能,且倍率性能较好。可以作为钠离子电池正极材料。
Na_(0. 7)MnO_2 material with nanosheet structure is obtained by hydrothermal and heat treatment in this paper. The diameteris about 200 ～ 300 nm and the thickness is about 20 ～ 30 nm of Na_(0. 7)MnO_2 material. In electrochemical tests,the first discharge specific capacity of Na_(0. 7)MnO_2 obtained under 500 ℃ is 168. 3 mAh/g,close to the theoretical specific capacity 170 mAh/g of Na_(0. 7)MnO_2 material. Its discharge specific capacity is 161. 1 mAh/g during the continuous 70 cycles,with a capacity loss is only 4. 3%. The results indicate that the composite has high capacitance retention and a superior coulombic efficiency at long cycles. It could be used as the cathode material in sodium ion battery.
Na_(0. 7)MnO_2 material with nanosheet structure is obtained by hydrothermal and heat treatment in this paper. The diameteris about 200 ～ 300 nm and the thickness is about 20 ～ 30 nm of Na_(0. 7)MnO_2 material. In electrochemical tests,the first discharge specific capacity of Na_(0. 7)MnO_2 obtained under 500 ℃ is 168. 3 mAh/g,close to the theoretical specific capacity 170 mAh/g of Na_(0. 7)MnO_2 material. Its discharge specific capacity is 161. 1 mAh/g during the continuous 70 cycles,with a capacity loss is only 4. 3%. The results indicate that the composite has high capacitance retention and a superior coulombic efficiency at long cycles. It could be used as the cathode material in sodium ion battery.
引文
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[4] Liu Z,Hu Y,Dunstan M,et al. Local structure and dynamics in the Na ion battery positive electrode material Na3V2(PO4)2F3[J].Chem. Mater.,2014,26:2 513-2 521.
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[6] Vassilaras P,Toumar A,Ceder G. Electrochemical properties of Na Ni1/3Co1/3Fe1/3O2as a cathode material for Na-ion batteries[J]. Electrochemistry Communications,2014,38:79-81.
[7] Ding J,Zhou Y,Fu Z,et al. Cycle performance improvement of NaCrO2cathode by carbon coating for sodium ion batteries[J]. Electrochemistry Communications,2012,22:85-88.
[8] Wang X,Tamaru M,Okubo M,et al. Electrode properties of P2-Na2/3MnyCo1-yO2as cathode materials for sodium-ion batteries.[J]. J. Phys. Chem. C,2013,117:15 545-15 551.
[9] Arienzo M,Ruffo R,Scotti R,et al. Layered Na0. 71CoO2:a powerful candidate for viable and high performance Na-batteries[J].Phys. Chem. Chem. Phys.,2012,14:5 945-5 952.
[10] Billaud J,Clement R,Armstrong A,et al.βNa MnO2:A highperformance cathode for sodium-Ion batteries[J]. J. Am.Chem. Soc.,2014,136:17 243-17 248.
[11] Zhou X,Guduru R,Mohanty P,et al. Synthesis and characterization of Na0. 44Mn O2from solution precursors.[J]. J. Mater. Chem. A,2013,1:2 757-2 761.
[12] Su D,Wang C,Ahn H,et al. Single crystalline Na0. 7Mn O2manoplates as cathode materials for sodiumIon batteries with enhanced performance.[J]. J. Chem. Eur.,2013,19:10 884-10 889.
[2] Si L,Yuan Z,Hu L,et al. Uniform and continuous carbon coated sodium vanadium phosphate cathode materials for sodium-ion battery[J]. Journal of Power Sources,2014,272:880-885.
[3] Ramireddy T,Rahman M,Sharma N,et al. Carbon coated Na7Fe7(PO4)6F3:A novel intercalation cathode for sodium-ion batteries.[J]. Journal of Power Sources,2014,271:497-503.
[4] Liu Z,Hu Y,Dunstan M,et al. Local structure and dynamics in the Na ion battery positive electrode material Na3V2(PO4)2F3[J].Chem. Mater.,2014,26:2 513-2 521.
[5] Zhao J,Xu J,Lee D,et al. Electrochemical and thermal properties of P2-type Na2/3Fe1/3Mn2/3O2for Na-ion batteries[J]. Journal of Power Sources,2014,264:235-239.
[6] Vassilaras P,Toumar A,Ceder G. Electrochemical properties of Na Ni1/3Co1/3Fe1/3O2as a cathode material for Na-ion batteries[J]. Electrochemistry Communications,2014,38:79-81.
[7] Ding J,Zhou Y,Fu Z,et al. Cycle performance improvement of NaCrO2cathode by carbon coating for sodium ion batteries[J]. Electrochemistry Communications,2012,22:85-88.
[8] Wang X,Tamaru M,Okubo M,et al. Electrode properties of P2-Na2/3MnyCo1-yO2as cathode materials for sodium-ion batteries.[J]. J. Phys. Chem. C,2013,117:15 545-15 551.
[9] Arienzo M,Ruffo R,Scotti R,et al. Layered Na0. 71CoO2:a powerful candidate for viable and high performance Na-batteries[J].Phys. Chem. Chem. Phys.,2012,14:5 945-5 952.
[10] Billaud J,Clement R,Armstrong A,et al.βNa MnO2:A highperformance cathode for sodium-Ion batteries[J]. J. Am.Chem. Soc.,2014,136:17 243-17 248.
[11] Zhou X,Guduru R,Mohanty P,et al. Synthesis and characterization of Na0. 44Mn O2from solution precursors.[J]. J. Mater. Chem. A,2013,1:2 757-2 761.
[12] Su D,Wang C,Ahn H,et al. Single crystalline Na0. 7Mn O2manoplates as cathode materials for sodiumIon batteries with enhanced performance.[J]. J. Chem. Eur.,2013,19:10 884-10 889.