采用氢氧化物共沉淀法合成LiNi0.Co0.1 Mno1O2正极材料,对产物进行X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)及电化学性能分析,结果表明,LiNi0.Co0.1Mn0.1O2在0.5C下的循环性能和倍率性能较差,100次循环后,Li+的嵌入/脱嵌的界面阻抗(Rf)和电荷转移阻抗(Rct)迅速增加,极化增大.为改善其电化学性能,以尿素为沉淀剂,采用均匀沉淀法,在LiNi0.Co0.1 Mn01O2表面包覆不同比例Al2O3包覆层,研究其对LiNi0.-Co0.1Mn01O2电化学性能的影响.在所有的样品中,1％ Al2O3包覆LiNi0.8 Co01Mn01O2具有最优的六方晶型α-NaFeO2层状结构和最低的阳离子混排度.SEM和TEM图表明无定形透明多孔Al2O3包覆层均匀地包覆在LiN0.8Co0.1 Mn0.1O2表面.与纯相相比,1％Al2O3包覆LiNi08Co0.1Mn01O2具有较好的电化学性能,包括相对较高的首次放电容量189.56 mAh·g-1、最高的首次库伦效率87.95％、较好的循环性能和倍率性能.循环伏安(CV)和电化学阻抗(EIS)结果表明,LiNi0.8Co01Mn0.1O2电化学性能得到提高是由于Al2O3包覆层可以抑制电解液与正极副反应的发生,从而减小循环过程中界面阻抗值和电荷转移阻抗值的增大.
参考文献
| [1] | Yang-Kook Sun;Seung-Taek Myung;Byung-Chun Park.High-energy cathode material for long-life and safe lithium batteries[J].Nature materials,20094(4):320-324. |
| [2] | N. Recham;J-N. Chotard;L Dupont.A 3.6 V lithium-based fluorosulphate insertion positive electrode for lithium-ion batteries[J].Nature materials,20101(1):68-74. |
| [3] | Yang-Kook Sun;Seung-Taek Myung;Byung-Chun Park.Synthesis of Spherical Nano-to Microscale Core-Shell Particles Li[(Ni_(0.8)Co_(0.1)Mn_(0.1))_(1-x)(Ni_(0.5)Mn_(0.5)_x]O_2 and Their Applications to Lithium Batteries[J].Chemistry of Materials: A Publication of the American Chemistry Society,200622(22):5159-5163. |
| [4] | M. V. Reddy;Thor Wei Jie;Charl J. Jafta;Kenneth I. Ozoemena;Mkhulu K. Mathe;A. Sreekumaran Nair;Soo Soon Peng;M. Sobri Idris;Geetha Balakrishna;Fabian I. Ezema;B. V. R. Chowdari.Studies on Bare and Mg-doped LiCoO_2 as a cathode material for Lithium ion Batteries[J].Electrochimica Acta,2014:192-197. |
| [5] | Peng Yue;Zhixing Wang;Huajun Guo;Xunhui Xiong;Xinhai Li.A low temperature fluorine substitution on the electrochemical performance of layered LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2-z)F_z cathode materials[J].Electrochimica Acta,2013:1-8. |
| [6] | Xiang JF;Chang CX;Yuan LJ;Sun JT.A simple and effective strategy to synthesize Al2O3-coated LiNi0.8Co0.2O2 cathode materials for lithium ion battery[J].Electrochemistry communications,20089(9):1360-1363. |
| [7] | Won-Sub Yoon;Kyung-Wan Nam;Donghyuk Jang;Kyung Yoon Chung;Jonathan Hanson;Jin-Ming Chen;Xiao-Qing Yang.Structural study of the coating effect on the thermal stability of charged MgO-coated LiNi_(0.8)Co_(0.2)O_2 cathodes investigated by in situ XRD[J].Journal of Power Sources,2012Nov.1(Nov.1):128-134. |
| [8] | Fey GTK;Lu CZ;Kumar TP;Chang YC.TiO2 coating for long-cycling LiCoO2: A comparison of coating procedures[J].Surface & Coatings Technology,20051(1):22-31. |
| [9] | Xunhui Xiong;Zhixing Wang;Huajun Guo.Enhanced electrochemical properties of lithium-reactive V2O5 coated on the LiNi_(0.8)Co_(0.1)Mn_(0.1)O2 cathode material for lithium ion batteries at 60 °C[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,20134(4):1284-1288. |
| [10] | Shao-Kang Hu;Geng-Hao Cheng;Ming-Yao Cheng;Bing-Joe Hwang;Raman Santhanam.Cycle Life Improvement Of Zro_2-coated Spherical Lini_(1/3)co_(1/3)mn_(1/3)o_2 Cathode Material For Lithium Ion Batteries[J].Journal of Power Sources,20092(2):564-569. |
| [11] | S. J. Shi;J. P. Tu;Y. J. Mai;Y. Q. Zhang;Y. Y. Tang;X. L. Wang.Structure and electrochemical performance of CaF_2 coated LiMn_(1/3)Ni_(1/3)Co_(1/3)O_2 cathode material for Li-ion batteries[J].Electrochimica Acta,2012:105-112. |
| [12] | Yang-Kook Sun;Min-Joon Lee;Chong S. Yoon;Jusef Hassoun;Khalil Amine;Bruno Scrosati.The Role of AlF_3 Coatings in Improving Electrochemical Cycling of Li-Enriched Nickel-Manganese Oxide Electrodes for Li-Ion Batteries[J].Advanced Materials,20129(9):1192-1196. |
| [13] | Yu-Kai Lin;Chung-Hsin Lu.Preparation and electrochemical properties of layer-structured LiNi_(1/3)Co_(1/3)Mn_(1/3-y)Al_yO_2[J].Journal of Power Sources,20091(1):353-358. |
| [14] | Gil-Ho Kim;Seung-Taek Myung;Hyun-Soo Kim;Yang-Kook Sun.Synthesis of spherical Li[Ni{sub}(1/3-z)Co{sub}(1/3-z)Mn{sub}(1/3-z)Mg{sub}z]O{sub}2 positive electrode material for lithium-ion battery[J].Electrochimica Acta,200612(12):2447-2453. |
| [15] | N.V. Kosova;E.T. Devyatkina;V.V. Kaichev.Optimization of Ni~(2+)/Ni~(3+) ratio in layered Li(Ni,Mn,Co)O_2 cathodes for better electrochemistry[J].Journal of Power Sources,20072(2):965-969. |
| [16] | Jan, S. Savut;Nurgul, S.;Shi, Xiaoqin;Xia, Hui;Pang, Huan.Improvement of electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode material by graphene nanosheets modification[J].Electrochimica Acta,2014:86-93. |
| [17] | Hailang Zhang;Tengfei Song.Synthesis and performance of fluorine substituted Li_(1.05)(Ni_(0.5)Mn_(0.5))_(0.95)O_(2-x)F_x cathode materials modified by surface coating with FePO_4[J].Electrochimica Acta,2013:116-124. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%