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

被引：18

作者：

Chandan, Prem ^{[1
]}

Chang, Chung-Chieh ^{[2
]}

Yeh, Kuo-Wei ^{[2
]}

Chiu, Chui-Chang ^{[2
]}

Wu, Dong-Ze ^{[1
]}

Huang, Tzu-Wen ^{[1
]}

Wu, Phillip M. ^{[1
]}

Chi, Po-Wei ^{[1
]}

Hsu, Wei-Fan ^{[1
]}

Su, Kai-Han ^{[3
]}

Lee, Yu-Wen ^{[4
]}

Chang, Hua-Shu ^{[1
]}

Wang, Ming-Jye ^{[5
]}

Wu, Heng-Liang ^{[4
]}

Tang, Horng-Yi ^{[6
]}

Wu, Maw-Kuen ^{[1
]}

机构：

[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[2] Gus Technol Co Ltd, New Taipei City 22175, Taiwan

[3] Natl Taipei Univ Technol, Inst Mechatron Engn, Taipei 10608, Taiwan

[4] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan

[5] Acad Sinica, Inst Astron & Astrophys, Taipei 11529, Taiwan

[6] Natl Chi Nan Univ, Dept Appl Chem, Puli 545, Taiwan

来源：

COMMUNICATIONS CHEMISTRY | 2019年 / 2卷 / 1期

关键词：

ANIONIC REDOX; CYCLING PERFORMANCE; ION; NI; MN; ELECTRODES; CAPACITY;

D O I：

10.1038/s42004-019-0223-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In the archetypal lithium-rich cathode compound Li1.2Ni0.13Co0.13Mn0.54O2, a major part of the capacity is contributed from the anionic (O2(-/-)) 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 Li1.083Ni0.333Co0.083Mn0.5O2, with reduced lithium content to modify the initial band structure, hence similar to 80% and similar to 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 Mn4+/Mn3+ and/or On-/O2- reduction at around 2.5/3.0 V seen in the typical lithium-rich materials is completely eliminated in the cationic dominated cathode material.

引用

页数：7

共 36 条

[1] The Effect of Cation Disorder on the Average Li Intercalation Voltage of Transition-Metal Oxides [J].