引用本文:
侯宪全, 江卫军, 其鲁, 韩立娟. 高容量锂离子电池正极材料LiNi0.8Co0.2-xMgxO2[J]. 物理化学学报,
2007, 23(0): 40-45.
doi:
10.3866/PKU.WHXB2007Supp10
Citation: HOU Xian-Quan, JIANG Wei-Jun, QI Lu, HAN Li-Juan. Synthesis and Properties of Layered LiNi0.8Co0.2-xMgxO2 Cathode Material[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 40-45. doi: 10.3866/PKU.WHXB2007Supp10
Citation: HOU Xian-Quan, JIANG Wei-Jun, QI Lu, HAN Li-Juan. Synthesis and Properties of Layered LiNi0.8Co0.2-xMgxO2 Cathode Material[J]. Acta Physico-Chimica Sinica, 2007, 23(0): 40-45. doi: 10.3866/PKU.WHXB2007Supp10
高容量锂离子电池正极材料LiNi0.8Co0.2-xMgxO2
摘要:
以共沉淀法合成了高容量锂离子电池用正极材料LiNi0.8Co0.2-xMgxO2 (x=0.02, 0.03, 0.04). 对合成的层状材料采用X射线衍射(XRD)、扫描电镜(SEM)、热重(TG)和差示扫描热量(DSC)进行了结构、形貌和热分析. 分析结果表明, 所得生成物为球形颗粒, 结构为α-NaFeO2型层状结构, 生成物中无杂相. 在电压范围为3.0-4.3 V, 放电电流密度为0.5 mA·cm-2 时, 对材料的电化学性能进行了测试. 首次放电容量最高可达184.8 mAh·g-1; 循环50次后, 容量保持率为94.2%. DSC结果表明, 无机金属离子Mg掺杂后材料基本保持高容量, 同时相变得到抑制, 材料的稳定性和循环性能提高.
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关键词:
- 锂离子电池; 正极材料; 高容量; 掺杂
English
Synthesis and Properties of Layered LiNi0.8Co0.2-xMgxO2 Cathode Material
Abstract:
LiNi0.8Co0.2-xMgxO2 (x=0.02, 0.03, 0.04) cathode materials were synthesized by co-precipitation method. The materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetry (TG), and differential scanning calorimetry (DSC). The results showed that the spherical products, without impurities, had a typical α-NaFeO2 layered structure. In the range of 3.0-4.3 V, at 0.5 mA·cm-2 of the current density, the first specific capacity was 184.8 mAh·g-1. After 50 cycles, the capacity retention was 94.2%. The DSC result showed that after the doping with Mg2+, the phase transition of LiNi0.8Co0.2-xMgxO2 was inhibited without distinct capacity fall. At the same time, the stability and cycling character was improved obviously.
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