Plasma assisted synthesis of LiNi0.6Co0.2Mn0.2O2 cathode materials with good cyclic stability at subzero temperatures

• 作者: Fanbo Meng Renzong Hu Zhiwei Chen Liang Tan Xuexia Lan Bin Yuan
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（5）
• 页码范围: 46-55
• 页数: 10页
• 语种: 英文

摘要

Layered Ni-rich cathode materials,LiNi0.6Co0.2Mn0.2O2 (NCM622),are synthesized via solid reaction assisted with a plasma milling pretreatment,which is resulted in lowering sintering temperatures for solid precursors.The plasma milling pretreated NCM622 cathode material sintered at 780 ℃ (named as PM-780) demonstrates good cycling stability at both room and subzero temperatures.Specifically,the PM-780 cathode delivers an initial discharge capacity of 171.2 mAh g-1 and a high capacity retention of 99.7％ after 300 cycles with current rate of 90 mA g-1 at 30 ℃,while stable capacities of 120.3 and 94.0 mAh g-1 can be remained at-10 ℃ and-20 ℃ in propylene carbonate contained electrolyte,respectively.In-situ XRD together with XPS and SEM reveal that the NCM622 cycled at-10 ℃ presented better structural stability and more intact interface than that of cathodes cycled at 30 ℃.It is also found that subzero temperatures only limit the discharge potential of NCM622 without destroying its structure during cycling since it still exhibits high discharge capacity at 30 ℃ after cycled at subzero temperatures.This work may expand the knowledge about the low-temperature characteristics of layered cathode materials for Li-ion batteries and lay the foundation for its further applications.