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Operando Tailoring of Defects and Strains in Corrugated β‐Ni(OH) 2 Nanosheets for Stable and High‐Rate Energy Storage
Author(s) -
Li Shaofeng,
Sharma Nikhil,
Yu Chang,
Zhang Yan,
Wan Gang,
Fu Rong,
Huang Hongling,
Sun Xueyan,
Lee SangJun,
Lee JunSik,
Nordlund Dennis,
Pianetta Piero,
Zhao Kejie,
Liu Yijin,
Qiu Jieshan
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202006147
Subject(s) - materials science , supercapacitor , gravimetric analysis , nickel , fabrication , electrochemistry , hydroxide , electrode , energy storage , chemical engineering , structural stability , nanotechnology , metallurgy , chemistry , organic chemistry , physics , medicine , power (physics) , alternative medicine , pathology , quantum mechanics , structural engineering , engineering
Nickel hydroxide represents a technologically important material for energy storage, such as hybrid supercapacitors. It has two different crystallographic polymorphs, α‐ and β‐Ni(OH) 2 , showing advantages in either theoretical capacity or cycling/rate performance, manifesting a trade‐off trend that needs to be optimized for practical applications. Here, the synergistic superiorities in both activity and stability of corrugated β‐Ni(OH) 2 nanosheets are demonstrated through an electrochemical abuse approach. With ≈91% capacity retention after 10 000 cycles, the corrugated β‐Ni(OH) 2 nanosheets can deliver a gravimetric capacity of 457 C g −1 at a high current density of 30 A g −1 , which is nearly two and four times that of the regular α‐ and β‐Ni(OH) 2 , respectively. Operando spectroscopy and finite element analysis reveal that greatly enhanced chemical activity and structural robustness can be attributed to the in situ tailored lattice defects and the strain‐induced highly curved micromorphology. This work demonstrates a multi‐scale defect‐and‐strain co‐design strategy, which is helpful for rational design and tuned fabrication of next‐generation electrode materials for stable and high‐rate energy storage.