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Storage of Mechanical Energy Based on Carbon Nanotubes with High Energy Density and Power Density
Author(s) -
Bai Yunxiang,
Shen Boyuan,
Zhang Shenli,
Zhu Zhenxing,
Sun Silei,
Gao Jun,
Li Banghao,
Wang Yao,
Zhang Rufan,
Wei Fei
Publication year - 2019
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.201800680
Subject(s) - materials science , carbon nanotube , energy storage , mechanical energy , flywheel , energy density , ultimate tensile strength , kinetic energy , power density , nanotechnology , composite material , strain energy , specific energy , power (physics) , mechanical engineering , engineering physics , thermodynamics , physics , quantum mechanics , engineering , finite element method
Energy storage in a proper form is an important way to meet the fast increase in the demand for energy. Among the strategies for storing energy, storage of mechanical energy via suitable media is widely utilized by human beings. With a tensile strength over 100 GPa, and a Young's modulus over 1 TPa, carbon nanotubes (CNTs) are considered as one of the strongest materials ever found and exhibit overwhelming advantages for storing mechanical energy. For example, the tensile‐strain energy density of CNTs is as high as 1125 Wh kg ‐1 . In addition, CNTs also exhibit great potential for fabricating flywheels to store kinetic energy with both high energy density (8571 Wh kg ‐1 ) and high power density (2 MW kg ‐1 to 2 GW kg ‐1 ). Here, an overview of some typical mechanical‐energy‐storage systems and materials is given. Then, theoretical and experimental studies on the mechanical properties of CNTs and CNT assemblies are introduced. Afterward, the strategies for utilizing CNTs to store mechanical energy are discussed. In addition, macroscale production of CNTs is summarized. Finally, future trends and prospects in the development of CNTs used as mechanical‐energy‐storage materials are presented.