Scalable Nitrate Treatment for Constructing Integrated Surface Structures to Mitigate Capacity Fading and Voltage Decay of Li‐Rich Layered Oxides. (6th May 2022)

• Record Type: Journal Article
• Authors: Luo, Dong; Xie, Huixian; Tan, Fulin; Ding, Xiaokai; Cui, Jiaxiang; Xie, Xiaoyan; Liu, Chenyu; Lin, Zhan
• Is Part Of: Angewandte Chemie. Volume 134:Number 27(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-06
• Subjects: Capacity Fading and Voltage Decay -- Li-Ion Batteries -- Li-Rich Layered Oxides -- Surface Integrated Structure; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202203698
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Capacity fading and voltage decay is one of the biggest obstacles for the practical application of Li‐rich layered oxides due to the serious surface‐related detrimental reactions. Herein, we develop a versatile and scalable method to construct a robust surface‐integrated structure. All the designed samples deliver outstanding capacity and voltage stability, among which the Zn‐treated sample possesses the best electrochemical performance. Its capacity retention is larger than 90 % after 400 cycles with a voltage decay ratio as small as 0.73 mV per cycle. What is more, the rules of surface‐integrated structure with different cations in terms of capacity and voltage stability is further deciphered by combining with density function theory (DFT) calculations. It is found that to obtain advanced Li‐rich layered oxide cathodes, cations in Li‐sites should firstly ensure the binding energy of the surface‐integrated structure in a lower level and then provide Bader charge for the nearest O atoms as small as possible. Abstract : Scalable nitrate treatment for constructing surface‐integrated structure was developed to mitigate capacity fading and voltage decay. A rule for building robust surface‐integrated structure is also proposed. When the binding energy of the structure locates at a low level and the Bader charge of the O atoms nearest to the cationic atoms is as small as possible, an advanced Li‐rich layered oxide cathode can be obtained.