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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 10    October 2019

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Thermodynamic analysis of Li-Ni-Co-Mn-H2O system and synthesis of LiNi0.5Co0.2Mn0.3O2 composite oxide via aqueous process
LI Yun-jiao(李运姣)1, 2, LI Ling(李玲)1, 2, SU Qian-ye(苏千叶)1, 2, LU Wei-sheng(卢伟胜)2,HAN Qiang(韩强)1, 2, LI Lin(李林)1, CHEN Yong-xiang(陈永祥)1, 2, DENG Shi-yi(邓诗易)1, 2, LEI Tong-xing(雷同兴)1, 2

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Citic Dameng Mining Industries Limited, Nanning 530028, China

Abstract:The constructed potential-pH diagrams of Li-Ni (Co, Mn)-H2O system indicate that the LiNiO2, LiCoO2 and LiMnO2 are thermodynamically stable in aqueous solution within the temperature range of 25-200 °C and the activity range of 0.01-1.00. A predominant co-region of LiNiO2, LiCoO2 and LiMnO2 oxides (Li-Ni-Co-Mncomposite oxide) is found in the Li-Ni-Co-Mn-H2O potential-pH diagrams, in which the co-precipitation region expands towards lower pH with rising temperature, indicating the enhanced possibility of synthesizing Li-Ni-Co-Mn composite oxide in aqueous solution. The experimental results prove that it is feasible to prepare the LiNi0.5Co0.2Mn0.3O2 cathode materials (NCM523) by an aqueous routine. The as-prepared lithiated precursor and NCM523 both inherit the spherical morphology of the hydroxide precursor and the obtained NCM523 has a hexagonal α-NaFeO2 structure with good crystallinity. It is reasonable to conclude that the aqueous routine for preparing NCM cathode materials is a promising method with the guidance of the reliable potential-pH diagrams to some extent.

 

Key words: aqueous process; potential-pH diagrams; thermodynamics; LiNi0.5Co0.2Mn0.3O2; cathode materials

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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