TY  - JOUR
AU  - Ju, Xiaokang
AU  - Hou, Xu
AU  - Liu, Zhongqing
AU  - Du, Leilei
AU  - Zhang, Li
AU  - Xie, Tangtang
AU  - Paillard, Elie
AU  - Wang, Taihong
AU  - Winter, Martin
AU  - Li, Jie
TI  - Revealing the Effect of High Ni Content in Li‐Rich Cathode Materials: Mitigating Voltage Decay or Increasing Intrinsic Reactivity
JO  - Small
VL  - 19
IS  - 20
SN  - 1613-6810
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2024-02563
SP  - 2207328
PY  - 2023
N1  - Unterstützt durch DFG, Projekt Li 2916/2-1
AB  - Li-rich layered oxides are considered as one of the most promising cathode materials for secondary lithium batteries due to their high specific capacities, but the issue of continuous voltage decay during cycling hinders their market entry. Increasing the Ni content in Li-rich materials is assumed to be an effective way to address this issue and attracts recent research interests. However, a high Ni content may induce increased intrinsic reactivity of materials, resulting in severe side reactions with the electrolyte. Thus, a comprehensive study to differentiate the two effects of the Ni content on the cell performance with Li-rich cathode is carried out in this work. Herein, it is demonstrated that a properly dosed amount of Ni can effectively suppress the voltage decay in Li-rich cathodes, while over-loading of Ni, on the contrary, can cause structural instability, Ni dissolution, and nonuniform Li deposition during cycling as well as severe oxygen loss. This work offers a deep understanding on the impacts of Ni content in Li-rich materials, which can be a good guidance for the future design of such cathodes for high energy density lithium batteries.
LB  - PUB:(DE-HGF)16
C6  - 36799132
UR  - <Go to ISI:>//WOS:000939488800001
DO  - DOI:10.1002/smll.202207328
UR  - https://juser.fz-juelich.de/record/1024913
ER  -