Calorimetric Studies on Chemically Delithiated LiNi<sub>0.4</sub>Mn<sub>0.4</sub>Co<sub>0.2</sub>O<sub>2</sub>: Investigation of Phase Transition, Gas Evolution and Enthalpy of Formation
Abstrak
Li<sub>1.11</sub>(Ni<sub>0.4</sub>Mn<sub>0.4</sub>Co<sub>0.2</sub>)O<sub>2</sub> powders were chemically delithiated by (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> oxidizer to obtain Li<sub>x</sub>(Ni<sub>0.4</sub>Mn<sub>0.4</sub>Co<sub>0.2</sub>)O<sub>2</sub> powders. The thermal behavior of two delithiated specimens, Li<sub>0.76</sub>Ni<sub>0.41</sub>Mn<sub>0.42</sub>Co<sub>0.17</sub>O<sub>2.10</sub> and Li<sub>0.48</sub>Ni<sub>0.38</sub>Mn<sub>0.46</sub>Co<sub>0.16</sub>O<sub>2.07</sub>, was studied compared to the pristine specimen. Phase transitions at elevated temperatures were investigated by simultaneous thermal analysis (STA) and the gas evolution accompanying the phase transitions was analyzed by mass spectroscopy and an oxygen detector. The enthalpy of two delithiated samples and a pristine specimen were measured by a high temperature drop solution calorimeter. Based on these results, the enthalpies of formation were calculated.
Topik & Kata Kunci
Penulis (7)
Wenjiao Zhao
Julian Gebauer
Thomas Bergfeldt
Magnus Rohde
Carlos Ziebert
Yong Du
Hans J. Seifert
Format Sitasi
Akses Cepat
- Tahun Terbit
- 2023
- Sumber Database
- DOAJ
- DOI
- 10.3390/batteries9050275
- Akses
- Open Access ✓