A Practicable Li/Na‐Ion Hybrid Full Battery Assembled by a High‐Voltage Cathode and Commercial Graphite Anode: Superior Energy Storage Performance and Working Mechanism

• Published in: Advanced energy materials Vol. 8; no. 10
• Main Authors: Guo, Jin‐Zhi, Yang, Yang, Liu, Dao‐Sheng, Wu, Xing‐Long, Hou, Bao‐Hua, Pang, Wei‐Lin, Huang, Ke‐Cheng, Zhang, Jing‐Ping, Su, Zhong‐Min
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 05.04.2018
• Subjects: Anodes; Batteries; Beads; Cathodes; Electric potential; Electrode materials; Energy storage; ex situ XRD; Flux density; Graphite; high energy density; hybrid Li/Na‐ion batteries; Lithium; low‐temperature performance; Mesophase; Na3V2(PO4)2O2F; Reaction kinetics; Titration
• ISSN: 1614-6832; 1614-6840
• DOI: 10.1002/aenm.201702504

With the rapidly growing demand for low‐cost and safe energy storage, the advanced battery concepts have triggered strong interests beyond the state‐of‐the‐art Li‐ion batteries (LIBs). Herein, a novel hybrid Li/Na‐ion full battery (HLNIB) composed of the high‐energy and lithium‐free Na3V2(PO4)2O2F (NVPOF) cathode and commercial graphite anode mesophase carbon micro beads is for the first time designed. The assembled HLNIBs exhibit two high working voltage at about 4.05 and 3.69 V with a specific capacity of 112.7 mA h g−1. Its energy density can reach up to 328 W h kg−1 calculated from the total mass of both cathode and anode materials. Moreover, the HLNIBs show outstanding high‐rate capability, long‐term cycle life, and excellent low‐temperature performance. In addition, the reaction kinetics and Li/Na‐insertion/extraction mechanism into/out NVPOF is preliminarily investigated by the galvanostatic intermittent titration technique and ex situ X‐ray diffraction. This work provides a new and profound direction to develop advanced hybrid batteries. A novel Li/Na‐ion hybrid battery with high working voltage and superior electrochemical and low‐temperature properties is designed and assembled by using lithium‐free Na3V2(PO4)2O2F (NVPOF) and commercial graphite as cathode and anode, respectively. The electrode kinetics and Li/Na‐insertion/extraction processes into/out the NVPOF cathode are preliminarily studied by the galvanostatic intermittent titration technique and ex situ X‐ray diffraction.