Details

Autor(en) / Beteiligte

• Chandan, Prem
• Chang, Chung-Chieh
• Yeh, Kuo-Wei
• Chiu, Chui-Chang
• Wu, Dong-Ze
• Huang, Tzu-Wen
• Wu, Phillip M.
• Chi, Po-Wei
• Hsu, Wei-Fan
• Su, Kai-Han
• Lee, Yu-Wen
• Chang, Hua-Shu
• Wang, Ming-Jye
• Wu, Heng-Liang
• Tang, Horng-Yi
• Wu, Maw-Kuen

Titel

Voltage fade mitigation in the cationic dominant lithium-rich NCM cathode

Ist Teil von

• Communications chemistry, 2019-10, Vol.2 (1), Article 120

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2019

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• In the archetypal lithium-rich cathode compound Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 , a major part of the capacity is contributed from the anionic (O 2−/− ) reversible redox couple and is accompanied by the transition metal ions migration with a detrimental voltage fade. A better understanding of these mutual interactions demands for a new model that helps to unfold the occurrences of voltage fade in lithium-rich system. Here we present an alternative approach, a cationic reaction dominated lithium-rich material Li 1.083 Ni 0.333 Co 0.083 Mn 0.5 O 2 , with reduced lithium content to modify the initial band structure, hence ~80% and ~20% of capacity are contributed by cationic and anionic redox couples, individually. A 400 cycle test with 85% capacity retention depicts the capacity loss mainly arises from the metal ions dissolution. The voltage fade usually from Mn 4+ /Mn 3+ and/or O n− /O 2− reduction at around 2.5/3.0 V seen in the typical lithium-rich materials is completely eliminated in the cationic dominated cathode material. At low voltages, lithium-rich cathodes can undergo a detrimental voltage fade. Here by tuning the band structure of the cathode, 85% capacity retention over 400 cycles is achieved.