New Insights into the Chemistry of the Hydrothermal Synthesis of Olivine Lithium Metal Phosphates. Issue 2 (12th January 2023)

• Record Type: Journal Article
• Authors: Chen, Wen‐Jing; Xiao, Han; Chen, Wei; Fang, Hai‐Sheng
• Is Part Of: ChemistrySelect. Volume 8:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-12
• Subjects: alkali ions -- hydrothermal synthesis -- nanoparticle -- olivine lithium metal phosphates -- transition metals; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202203901
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The effect of alkali ions (Na + and K + ) on the hydrothermal synthesis of olivine lithium metal phosphates in the P excess system was investigated by taking the synthesis of LiMn0.8 Fe0.19 Mg0.01 PO4 as a case study. It is found that the coexisting Na + can compete with Li + to partly form NaMnPO4 as an impurity when the Na + /Li + ratio exceeds the critical value, and this is not the case for the coexisting K + . These behaviors should be related to the difference in the ionic size of the alkali ions which also leads to a very different process of LiMn0.8 Fe0.19 Mg0.01 PO4 formation. The samples derived from the K + ‐coexisting reaction system can deliver much higher reversible capacities as compared with the sample derived from the Na + ‐coexisting reaction system. This study provides new insights into the chemistry of the hydrothermal synthesis of olivine lithium metal phosphates, with an important implication for controllable synthesis and property manipulation. Abstract : The effect of alkali metal ions (Na + and K + ) on the hydrothermal synthesis of olivine lithium metal phosphates (LiMPO4 ) is studied and it is found that the coexisting Na + has an unfavorable effect on the synthesis and property of the material, while this is not the case for the coexisting K + .