Effects of surface lithiated TiO ₂ nanorods on room‐temperature properties of polymer solid electrolytes

Abstract

Summary Polymer solid electrolyte with high ionic conductivity at room‐temperature is most likely to be widely used in solid‐state lithium batteries. In this work, the novel surface lithiated TiO2 nanorods were firstly used as ionic conductor in polymer solid electrolyte. The surface lithiated TiO2 nanorods‐filled polypropylene carbonate polymer composite solid electrolyte (CSE) has an uniform composite structure with a thickness of about 60 μm. The ionic conductivity at room‐temperature is 1.21 × 10−4 S cm−1 and the electrochemical stability window is up to 4.6 V (vs Li+/Li). The assembled NCM622/CSE/Li solid‐state battery shows a stable cycle performance with a retention capacity of 120 mAh g−1 after 200 cycles at the current density of 0.3 C and a high coulomb efficiency of 99%. Compared with TiO2 particles, this novel surface lithiated TiO2 nanorods can provide more continuous ion transport channels and more Lewis acid‐base reactive sites, provide a novel way to enhance the lithium ion transport in polymer solid electrolyte.

Approaching high performancePVDF‐HFPbased solid composite electrolytes withLLTOnanorods for solid‐state lithium‐ion batteries

“…Therefore, solid-state electrolytes are considered as an excellent candidate to replace liquid electrolytes. [8][9][10][11] At present, many polymers have been studied as the matrix of solid polymer electrolytes (SPEs), such as poly(ethyleneoxide) (PEO), 12 polyacrylonitrile (PAN), 13 poly(vinylidene fluoride-co-hexafluoropropylene (PVDF-HFP), 14 poly(propylene carbonate) (PPC), 15 poly(vinylidene fluoride) (PVDF), 16 and so on. Unfortunately, there are many inherent issues for SPEs, which limit their commercial application in various aspects.…”

High performance of the sodium‐ion conducting flexible polymer blend composite electrolytes for electrochemical double‐layer supercapacitor applications

“…The rectangular shape resembles a perfect capacitor, and no clear peaks occur due to the absence of electron transfer processes (redox reactions). This indicates the occurrence of non‐Faradaic reactions, that is, the formation of an electric double layer at the junction of electrode/electrolyte 79 . The ions have sufficient time to transport.…”

“…This indicates the occurrence of non-Faradaic reactions, that is, the formation of an electric double layer at the junction of electrode/electrolyte. 79 The ions have sufficient time to transport. The mobile ions that are dispersed in the pores of the electrode get collected near the interface between the electrode and the electrolyte.…”

Progress and perspectives on electrospinning techniques for solid‐state lithium batteries

“…Passive (or inert) fillers can affect the ion transport mechanisms in polymers through indirect ways (without participating in the ionic transport), such as acting as “plasticizers,” inhibiting polymer crystallization, increasing the free volume, and speeding up segmental dynamics 147,148 . So far, lots of materials, such as Si, 149 SiO 2 , 150 Al 2 O 3 , 151 TiO 2 , 152 ZrO 2 , 153 ZnAl 2 O 4 , 154 BaTiO 3 , 155 and MOFs 156 have been used as passive fillers to improve the overall performance of hybrid SSEs (detailed information of electrospinning technique in the preparation of hybrid SSEs with passive fillers can be found in Table 2). Concerning active fillers, most of the Li‐ion‐conducting ceramics have been reported to construct the hybrid SSEs.…”