Details

Autor(en) / Beteiligte

• Yuan, Bing
• Liao, Shi-Xuan
• Xin, Yan
• Zhong, Yanjun
• Shi, Xiaxing
• Li, Longyan
• Guo, Xiaodong

Titel

Cobalt-doped lithium-rich cathode with superior electrochemical performance for lithium-ion batteries

Ist Teil von

• RSC advances, 2015-01, Vol.5 (4), p.2947-2951

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Li-rich Mn-based Co-doped Li 1.231 Mn 0.615−0.75 x Ni 0.154 Co x O 2 ( x = 0, 0.02, 0.05, 0.07, 0.10, 0.12, 0.15, 0.20, 0.25) cathode materials were prepared by a facile combustion method. X-ray diffraction analysis indicates that the crystal structure of materials has been modified by the doped cobalt ions. The capacity differential results obtained from the galvanostatic charge-discharge process within 2.0 and 4.8 V ( vs. Li/Li + ) indicate that the cobalt doped in the material could conduce to lithium ions re-embedded into the structure and increase the electrical properties. Compared with the electrochemical properties of these materials, the optimum doped sample is Li 1.231 Mn 0.525 Ni 0.154 Co 0.12 O 2 ( x = 0.12), which delivers an extreme minimum irreversible capacity of 59.1 mA h g −1 with the highest coulombic efficiency of 82.6%, and its discharge specific capacity maintains 180.7 mA h g −1 at 1 C rate after 50 cycles. Cobalt doped to modify the structure of lithium-rich cathode and obtain the material with superior electrochemical performance.