锂离子电池正极材料LiNi_(0.8)Co_(0.15)Al_(0.05)O_2的制备及电化学性能
|
摘要
首先以AlO2-为铝源,采用三元共沉淀法制备前驱体Ni_(0.8)Co_(0.15)Al_(0.05)(OH)_2。对前驱体进行500℃高温处理,随后与过量的锂盐混合均匀,在氧气气氛下700℃煅烧12 h制得LiNi_(0.8)Co_(0.15)Al_(0.05)O_2(NCA)材料。采用X射线衍射仪(XRD)测试可知,所得的NCA材料呈典型的α-NaFeO_2层状结构,属于R-3m空间群。扫描电子显微镜(SEM)测试显示,NCA为粒径5～6μm的球状颗粒。材料在电流倍率为0.1C下首次放电容量为167.1mAh/g,循环200次以后容量保持率为96.2%。倍率测试表明,0.1、10 C下NCA的容量分别为184.0、112.7 mAh/g,到恢复到0.1 C时,容量仍可达179.7mAh/g,具有比较好的倍率性能。
The Ni_(0.8)Co_(0.15)Al_(0.05)(OH)_2 precursor was prepared by a co-precipitation method, and AlO_2-was used as an Al source. The precursor was processed at 500℃, and then mixed with excess LiOH·H_2O and calcined at 700 ℃ for 12 h under the O_2 atmosphere.Finally, LiNi_(0.8)Co_(0.15)Al_(0.05)O_2(NCA) materials were synthesized. X-ray diffraction(XRD) test shows that the NCA material is a typicalα-NaFeO_2 layered structure and belongs to the R-3 m space group. According to scanning electron microscopy(SEM) observation, they are uniform spheroidal particles with a diameter of 5～6 μm. The results of electrochemical tests show that the first discharge capacity of NCA is 167.1 mAh/g at 0.1 C rate, and the capacity retention rate after 200 cycles is 96.2%. The rate capacity test indicates that its capacity at 0.1 C and 10 C is 184.0 and 112.7 mAh/g, respectively. When restored to 0.1 C, the capacity can reach 179.7 mAh/g, and has a good rate performance.
The Ni_(0.8)Co_(0.15)Al_(0.05)(OH)_2 precursor was prepared by a co-precipitation method, and AlO_2-was used as an Al source. The precursor was processed at 500℃, and then mixed with excess LiOH·H_2O and calcined at 700 ℃ for 12 h under the O_2 atmosphere.Finally, LiNi_(0.8)Co_(0.15)Al_(0.05)O_2(NCA) materials were synthesized. X-ray diffraction(XRD) test shows that the NCA material is a typicalα-NaFeO_2 layered structure and belongs to the R-3 m space group. According to scanning electron microscopy(SEM) observation, they are uniform spheroidal particles with a diameter of 5～6 μm. The results of electrochemical tests show that the first discharge capacity of NCA is 167.1 mAh/g at 0.1 C rate, and the capacity retention rate after 200 cycles is 96.2%. The rate capacity test indicates that its capacity at 0.1 C and 10 C is 184.0 and 112.7 mAh/g, respectively. When restored to 0.1 C, the capacity can reach 179.7 mAh/g, and has a good rate performance.
引文
[1]Jaguemont J,Boulon L,DubéY.Applied Energy[J],2016,164(15):99
[2]Xu B,Qian D,Wang Z et al.Materials Science&Engineering R Reports[J],2012,73(5-6):51
[3]Sun Lingna(孙灵娜),Fang Bo(方波),Xu Jiajie(徐佳杰)et al.Rare Metal Materials&Engineering(稀有金属材料与工程)[J],2016,45(S1):219
[4]Wu N,Wu H,Yuan W et al.Journal of Materials Chemistry A[J],2015,3(26):13 648
[5]Jianming Z,Wang H,Arumugam M.ACS Applied Materials&Interfaces[J],2015,7(12):6926
[6]Zhou P,Zhang Z,Meng H et al.Nanoscale[J],2016,8:19 263
[7]Xiong X,Wang Z,Yue P et al.Journal of Power Sources[J],2013,222(2):318
[8]Yoon S,Jung K N,Yeon S H et al.Journal of Electroanalytical Chemistry[J],2012,683:88
[9]Meng H,Zhou P,Zhang Z et al.Ceramics International[J],2017,43(4):3885
[2]Xu B,Qian D,Wang Z et al.Materials Science&Engineering R Reports[J],2012,73(5-6):51
[3]Sun Lingna(孙灵娜),Fang Bo(方波),Xu Jiajie(徐佳杰)et al.Rare Metal Materials&Engineering(稀有金属材料与工程)[J],2016,45(S1):219
[4]Wu N,Wu H,Yuan W et al.Journal of Materials Chemistry A[J],2015,3(26):13 648
[5]Jianming Z,Wang H,Arumugam M.ACS Applied Materials&Interfaces[J],2015,7(12):6926
[6]Zhou P,Zhang Z,Meng H et al.Nanoscale[J],2016,8:19 263
[7]Xiong X,Wang Z,Yue P et al.Journal of Power Sources[J],2013,222(2):318
[8]Yoon S,Jung K N,Yeon S H et al.Journal of Electroanalytical Chemistry[J],2012,683:88
[9]Meng H,Zhou P,Zhang Z et al.Ceramics International[J],2017,43(4):3885