Porous Co2VO4 Nanodisk as a High-Energy and Fast-Charging Anode for Lithium-Ion Batteries

• Published in: Nano-micro letters 2022-12, Vol.14 (1), p.5-5, Article 5
• Main Authors: Ren, Jinghui, Wang, Zhenyu, Xu, Peng, Wang, Cong, Gao, Fei, Zhao, Decheng, Liu, Shupei, Yang, Han, Wang, Di, Niu, Chunming, Zhu, Yusong, Wu, Yutong, Liu, Xiang, Wang, Zhoulu, Zhang, Yi
• Format: Article
• Language: English
• Subjects: Anode; Anodes; Charging; Cobalt vanadate oxide; Diffusion coefficient; Diffusion rate; Electric vehicles; Electrode materials; Electron transfer; Engineering; Fast-charging; Flux density; High-energy; Li-ion batteries; Lithium; Lithium-ion batteries; Mathematical analysis; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Pore size; Rechargeable batteries; Specific surface; Surface area
• ISSN: 2311-6706; 2150-5551
• DOI: 10.1007/s40820-021-00758-5

Highlights The Li + diffusion coefficient of Co 2 VO 4 is evaluated by theoretical calculation to be as high as 3.15 × 10 –10 cm 2  s −1 , theoretically proving Co 2 VO 4 a promising anode in fast-charging lithium-ion batteries. A hexagonal porous Co 2 VO 4 nanodisk (PCVO ND) structure is designed, featuring a high specific surface area of 74.57 m 2  g −1 and numerous pores with a pore size of 14 nm. The PCVO ND shows excellent fast-charging performance (a high average capacity of 344.3 mAh g −1 at 10 C for 1000 cycles with only 0.024% capacity loss per cycle for 1000 cycles). High-energy–density lithium-ion batteries (LIBs) that can be safely fast-charged are desirable for electric vehicles. However, sub-optimal lithiation potential and low capacity of commonly used LIBs anode cause safety issues and low energy density. Here we hypothesize that a cobalt vanadate oxide, Co 2 VO 4 , can be attractive anode material for fast-charging LIBs due to its high capacity (~ 1000 mAh g −1 ) and safe lithiation potential (~ 0.65 V vs. Li + /Li). The Li + diffusion coefficient of Co 2 VO 4 is evaluated by theoretical calculation to be as high as 3.15 × 10 –10 cm 2  s −1 , proving Co 2 VO 4 a promising anode in fast-charging LIBs. A hexagonal porous Co 2 VO 4 nanodisk (PCVO ND) structure is designed accordingly, featuring a high specific surface area of 74.57 m 2  g −1 and numerous pores with a pore size of 14 nm. This unique structure succeeds in enhancing Li + and electron transfer, leading to superior fast-charging performance than current commercial anodes. As a result, the PCVO ND shows a high initial reversible capacity of 911.0 mAh g −1 at 0.4 C, excellent fast-charging capacity (344.3 mAh g −1 at 10 C for 1000 cycles), outstanding long-term cycling stability (only 0.024% capacity loss per cycle at 10 C for 1000 cycles), confirming the commercial feasibility of PCVO ND in fast-charging LIBs.