In situ UV-cured composite electrolytes for highly efficient quasi-solid-state lithium ion batteries with wide temperature range applications. Issue 4 (18th January 2023)

• Record Type: Journal Article
• Authors: Zhou, Pengcheng; Liu, Yuxian; Chen, Jian; Lu, Shouqiang; Li, Huiyang
• Is Part Of: Sustainable energy & fuels. Volume 7:Issue 4(2023)
• Page Start: 986
• Page End: 995
• Publication Date: 2023-01-18
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d2se01679f
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : Quasi-solid-state LIBs with UV-cured IPCEs exhibited a high specific capacity of 128 mA h g −1 with a long cycle life at 25 °C and could retain excellent performances over a wide temperature range from 25 to 100 °C. Abstract : The replacement of flammable electrolytes with non-flammable electrolytes is the ultimate solution for addressing the safety concerns related to lithium-ion batteries. In this context, inorganic/polymer composite electrolytes (IPCEs) offer the advantages of high flexibility, stability, ionic conductivity, and interfacial compatibility and therefore have received growing research attention. Herein, a novel IPCE based on a Norland optical adhesive (NOA81) and a Li-rich fast ion conductor Li10.7 Al0.24 La3 Zr2 O12 for quasi-solid-state lithium-ion batteries was designed and synthesized via solvent-free in situ ultraviolet (UV) curing. In this system, polyethylene oxide and poly(vinylidene fluoride- co -hexafluoropropylene) were used to modify the polymers, and sebaconitrile was used as a plasticizer. Screen printing was also employed during the manufacturing process. The composite electrolyte displayed a lithium-ion conductivity of 1.3 × 10 −4 S cm −1 at 25 °C and sustained good stability up to 5.43 V ( vs. Li + /Li). Lithium-ion batteries fabricated using the composite electrolyte, a LiNi1/3 Mn1/3 Co1/3 O2 (NMC111) cathode, and a Li4 Ti5 O12 (LTO) anode achieved a specific capacity of 128 mA h g −1 and exhibited an 80% capacity retention after 154 cycles at 0.2C under testing at 25 °C. In addition, this battery exhibited an extremely high coulombic efficiency (>99.5%) over its entire cycle life. The NMC111 loading in the cathode reached 11.7 mg cm −2, which is comparable to those of commercialized electrodes. Significantly, the battery retained excellent electrochemical performances over a wide temperature range from 25 to 100 °C and achieved the highest specific capacity of 143 mA h g −1 at 45 °C.