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Excellent Rate Performance and Cycling Stability of TiP 2 O 7 @C/Carbon Nanotubes for the Aqueous Rechargeable Lithium‐Ion Battery
Author(s) -
Xu Tong,
Zhao Mingshu,
Duan Wenyuan,
Ding Meng,
Lashari Najeeb ur Rehman,
Wang Fei,
Song Xiaoping
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900534
Subject(s) - anode , materials science , lithium (medication) , electrolyte , carbon nanotube , calcination , chemical engineering , aqueous solution , current density , diffusion , cathode , carbon fibers , electrochemistry , composite number , battery (electricity) , nanotechnology , electrode , composite material , chemistry , catalysis , organic chemistry , medicine , physics , quantum mechanics , engineering , thermodynamics , endocrinology , power (physics)
A novel anode composite, carbon‐coated TiP 2 O 7 nanoparticles (TPO@C) decorated with carbon nanotubes (CNTs), is fabricated through a simple sol–gel method and a calcination process for aqueous rechargeable lithium‐ion batteries (ARLBs). The complete interfacial contact of TPO@C and CNTs provides a 3D network structure with a high specific surface area. The effects of CNTs on the diffusion coefficient of lithium ions, rate performance, and cycle performance are investigated. Typically, the discharge capacities of the TPO@C/CNTs anode can reach up to 97.88, 93.86, 90.79, 86.54, and 77.42 mA h g −1 at the current densities of 0.2, 0.5, 1, 2, and 5 A g −1 , respectively. At an extremely high current density of 10 A g −1 , the discharge capacity over 800 cycles is almost as high as the initial discharge capacity. Moreover, a (TPO@C/CNTs)//LiMn 2 O 4 full cell in saturated LiNO 3 electrolyte is tested in a pouch cell. It also demonstrates a high reversible capacity of 83.51 mA h g −1 (≈60.42% capacity retention) after 1000 cycles at 2 A g −1 . The results indicate that CNTs can promote the diffusion coefficient of lithium ions, and are responsible for the high rate performance and cycling stability.