Approaching high performance PVDF‐HFP based solid composite electrolytes with LLTO nanorods for solid‐state lithium‐ion batteries. (1st January 2021)

• Record Type: Journal Article
• Authors: Li, Jialun; Zhu, Lin; Zhang, Junwen; Jing, Maoxiang; Yao, Shanshan; Shen, Xiangqian; Li, Songjun; Tu, Feiyue
• Is Part Of: International journal of energy research. Volume 45:Number 5(2021)
• Page Start: 7663
• Page End: 7674
• Publication Date: 2021-01-01
• Subjects: Li0.33La0.557TiO3 nanorods -- poly(vinylidene fluoride‐co‐hexafluoropropylene) -- solid composite electrolyte -- solid‐state lithium‐ion batteries; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.6347
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Solid polymer electrolytes have the merits of high safety and energy density and lightweight. Therefore, they gradually become the key for commercial applications of solid batteries. In this study, a new type of solid composite electrolyte (SCE) is prepared by adding Li0.33 La0.557 TiO3 (LLTO) nanorods into poly(vinylidene fluoride‐ co ‐hexafluoropropylene (PVDF‐HFP) matrix. This SCE displays excellent thermal stability and mechanical properties. Moreover, it has been proven to sufficiently suppress the growth of lithium dendrites. When the content of the LLTO nanorods reaches 10 wt%, the SCE delivers a high ionic conductivity of 1.21 × 10 −4 S cm −1 at 25°C and the electrochemical stability window of 4.7 V (vs Li + /Li). The NCM622/SCE/Li solid‐state lithium‐ion battery delivers a discharge specific capacity of 129.1 mAh g −1 at 0.5 C after 100 cycles, and the coulombic efficiency reaches 99%. These results demonstrate that the SCE is expected to become one of the most hopeful candidates for the coming generation of solid‐state lithium‐ion batteries. Abstract : LLTO nanorods were prepared through electrospinning and subsequent calcinations, and PVDF‐HFP/LLTO‐nanorods solid composite electrolytes were prepared. The addition of LLTO nanorods improved electrical performance. The solid‐state battery with this solid composite electrolyte exhibited high electrochemical performance.