Actual pseudocapacity for Li ion storage in tunable core‐shell electrode architectures
Tuzhi Xiong,
Yingxia Gao,
Peng Huang,
Yongchao Huang,
Hao Yang,
M‐Sadeeq (Jie Tang) Balogun
Affiliations
Tuzhi Xiong
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University Changsha China
Yingxia Gao
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University Changsha China
Peng Huang
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University Changsha China
Yongchao Huang
Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education Guangzhou University Guangzhou China
Hao Yang
Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry & Chemical Engineering Guangxi University Nanning China
M‐Sadeeq (Jie Tang) Balogun
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University Changsha China
Abstract Upon evaluating the pseudocapacitance contribution (k1v) of electrode materials, the exact capacity (also termed as actual pseudocapacity, kQ) is usually ignored. However, there is a significant variation between k1v and kQ. Herein, we designed tunable in situ core‐shell electrode materials to examine the variation between the k1v and kQ. Using nickel foam (NF) as the starting material, the internal structure of NF is systematically controlled via in situ strategy to obtain the optimized nickel oxide core–shell architectures (denoted NFNTO). Despite the directly oxidized NF (denoted NFO) exhibits a higher k1v (79.1%) than the NFNTO (47.6%), the kQ of NFNTO is ≈2.3 fold larger than NFO at the highest current density of 8.0 mA cm−2. The higher kQ can be attributed to the integration of titanium that shortens the Li+ diffusion pathway, boosts the diffusion co‐efficient and improves the electronic conductivity towards achieving enhanced ionic transport.
