A novel titania nanorods‐filled composite solid electrolyte with improved room temperature performance for solid‐state Li‐ion battery

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 Li 0.33 La 0.557 TiO 3 (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 lithiumion 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.

Section: Introductionmentioning

confidence: 99%

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

Zhu

Zhang

et al. 2021

“…3 Solid polymer electrolytes (SPEs) have a broad application prospect in the direction of LIBs because of their good flexibility and high voltage resistance, so they have been paid more and more attention. 4,5 In all kinds of LIBs, SPEs not only act as a separator to prevent short circuit phenomenon, but also act as a bridge between cathode and anode to promote the transport of ions. Additionally, SPEs have the advantages of good thermal stability, wide electrochemical window, high mechanical properties and so on, which attract more researchers to carry out in-depth research and discussion.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to look for solid electrolytes which can replace liquid organic electrolytes to eliminate hidden threaten 3 . Solid polymer electrolytes (SPEs) have a broad application prospect in the direction of LIBs because of their good flexibility and high voltage resistance, so they have been paid more and more attention 4,5 . In all kinds of LIBs, SPEs not only act as a separator to prevent short circuit phenomenon, but also act as a bridge between cathode and anode to promote the transport of ions.…”

Section: Introductionmentioning

confidence: 99%

Toward high performance solid‐state lithium‐ion battery with a promising PEO / PPC blend solid polymer electrolyte

Zhu

Jia

et al. 2020

A promising solid polymer blend electrolyte is prepared by blending of poly(ethylene oxide) (PEO) with different content of amorphous poly(propylene carbonate) (PPC), in which the amorphous property of PPC is utilized to enhance the amorphous/free phase of solid polymer electrolyte, so as to achieve the purpose of modifying PEO-based solid polymer electrolyte. It indicates that the blending of PEO with PPC can effectively reduce the crystallization and increase the ion conductivity and electrochemical stability window of solid polymer electrolyte. When the content of PPC reaches 50%, the ionic conductivity reaches the maximum, which is 2.04 × 10 −5 S cm −1 and 2.82 × 10 −4 S cm −1 at 25 C and 60 C, respectively. The electrochemical stability window increases from 4.25 to 4.9 V and the interfacial stability of lithium metal anode is also greatly improved. The solid-state LiFePO 4 //Li battery with the PEO/50%PPC blend solid polymer electrolyte has good cycling stability, which the maximum discharge specific capacity is up to 125 mAh g −1 at a charge/discharge current density of 0.5 C at 60 C.

“…Li 7 La 3 Zr 2 O 12 , 16 LiAlO 2 , 17 Li 1.5 Ge 2 (PO 4 ) 3 , 18 Li 3 N, 19 Al 2 O 3 , 20 TiO 2 , 21 ZrO 2 , 22 SiO 2 , 23 ferroelectric material, 24,25 etc., can properly improve the ionic conductivity and material stability. However, whether active or inert fillers are added to the polymer in the form of randomly distributed nanoparticles, the agglomeration of fillers will be caused by the excessive addition of fillers, which leads to long migration paths and high transport resistance of lithium ion in electrolyte 26 . In recent studies, it has been found that the migration of lithium ions in organic/inorganic CSE is more inclined to along the filler/polymer interface 4,27 .…”

Section: Introductionmentioning

confidence: 99%

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

Song

Jing

et al. 2020

Self Cite

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.