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

Abstract

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.

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

“…The primary reason for limiting the application of polymer solid electrolytes is the low ionic conductivity. For instance, due to the high crystallization degree, the PEO-based SPEs deliver low ionic conductivity at ambient temperature and can only have good electrochemical performance when the temperature is above 60 C. 17 Therefore, the solid-state batteries with PEO-based solid electrolytes need to be equipped with a corresponding thermal management system when applied at room temperature, which will reduce their energy density. Moreover, the PEO-based SPEs have a narrow electrochemical window at room temperature and poor thermal stability, which restricts their commercial development in lithium-ion batteries.…”

Bistrifluoroacetamide‐Activated Double‐Layer Composite Solid Electrolyte for Dendrite‐Free Lithium Metal Battery

“…[ 25,26 ] On the other hand, although some studies have verified that PEO‐based composite electrolytes can expand the electrochemical window above 4.2 V in the presence of certain additives, PEO still becomes easier to decompose with the catalysis of the cathode/electrolyte interface. [ 27–29 ] The preparation of double‐layer electrolyte with PEO component on anode side and ceramic‐based component on cathode side can effectively solve the problem of unilateral interface instability, and give full play to the advantages of ceramic and polymer electrolyte. Although the design of this electrolyte structure provides a possibility for high‐voltage lithium‐ion all‐solid‐state batteries, the high crystallinity of the polymer component is still an obstacle to higher energy density.…”

High performances of all‐solid‐state battery with designed composite cathode: An effect of conductive binders with single‐walled carbon nanotube additives

“…Research has been mainly focused on solid electrolyte, such as polymer blending and organic/inorganic composites, and ion conductor, such as Li 7 La 3 Zr 2 O 12 in ASSBs system. 31,32 In addition, some papers researched on a composite anode including carbon nanotube, 33,34 while other researches focused on polyethylene oxide‐based electrolyte membrane applied multi‐walled carbon nanotubes (MWCNTs) using electrospinning method, 35 or focused on modifying an active material with carbon additives, such as MWCNTs and a graphene oxide 36 …”