A stable high-voltage lithium-ion battery realized by an in-built water scavenger. Issue 4 (3rd March 2020)

• Record Type: Journal Article
• Authors: Chang, Zhi; Qiao, Yu; Deng, Han; Yang, Huijun; He, Ping; Zhou, Haoshen
• Is Part Of: Energy & environmental science. Volume 13:Issue 4(2020)
• Page Start: 1197
• Page End: 1204
• Publication Date: 2020-03-03
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d0ee00060d
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : A simple metal–organic framework (MOF) based in-built water scavenger can efficiently eliminate various hazards induced by water in lithium rechargeable batteries. Abstract : Induced by the hydrolysis of electrolytes, hydrofluoric acid (HF) can exacerbate the notorious transition metal dissolution, which seriously restricts the development of high-energy-density lithium batteries based on high-voltage cathodes. Irremovable water, not limited to trace water originally contained in electrolytes, can also be continuously produced upon battery fabrication and electrochemical cycling processes, which has been ignored for a long time. Herein, exempting cells from cumbersome and time-consuming industrial water-removal procedures, we simply introduced a metal–organic framework (MOF) into the inside of cells as an effective in-built water scavenger. As a result, pairing the in-built water scavengers with various high-voltage cathodes (LiNi0.5 Mn1.5 O4, LiNi0.8 Co0.1 Mn0.1 O2, etc. ), we demonstrated superior cycling stability (72% capacity retention after 400 cycles for LiNi0.8 Co0.1 Mn0.1 O2, calculated from the 4th cycle after 3 cycles of activation) even under a harsh environment (200 ppm water containing electrolyte). Simply using a MOF as a water scavenger can simultaneously reduce the manufacturing costs of lithium-ion batteries while improving their lifespan and safety.