Effect of manganese on the structural and thermal stability of Li_0.3Ni_0.7 - yCo_0.3 ?#xa0;yMn_2yO₂ electrode materials (y = 0 and 0.05)

详细信息    查看全文

• 作者：Mohammed Dahbi^a ;   ; ^b ; Ismael Saadoune^a ;   ; ^{saadoune1@yahoo.fr} ; Torbjö ; rn Gustafsson^b ; Kristina Edströ ; m^b
• 关键词：Lithium batteries ; Thermal stability ; Safety ; LiNi_0.65Co_0.25Mn_0.10O₂
• 刊名：Solid State Ionics
• 出版年：2011
• 出版时间：16 November 2011
• 年：2011
• 卷：203
• 期：1
• 页码：37-41
• 全文大小：705 K

文摘

Thermal and structural stabilities of Li_0.3Ni_0.7Co_0.3O₂ and Li_0.3Ni_0.65Co_0.25Mn_0.10O₂ chemically delithiated cathode materials were studied by X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry. The structure of the Li_0.3Ni_0.7Co_0.3O₂ layered material (S.G. R-3 m) transforms first to the spinel-type structure (S.G. Fd3m) and then to the completely disordered NiO-type structure (S.G. Fm3m). These structural transitions were accompanied by 10.2 % oxygen loss and leads to an exothermic reaction, activated by the electrolyte, more energetic than that of Li_0.3Ni_0.65Co_0.25Mn_0.10O₂ manganese substituted electrode. Furthermore, no structural changes were observed during the thermal treatment of Li_0.3Ni_0.65Co_0.25Mn_0.10O₂ and relatively lower oxygen loss was recorded. The obtained results prove the positive effect of manganese substitution on the electrochemical features of Li_0.3Ni_0.7Co_0.3O₂.