Evidence of high temperature stable performance of polyether ether ketone (PEEK) separator with sponge-structured in lithium-ion battery
Source abstract
Abstract
Recent surge of thermal stable polymeric separators for LIBs has demonstrated potential success by utilizing phase inversion approach. However, via phase inversion, there are typically two types of morphologies, the finger-like and sponge-like, whose impact to the performance of the LIBs at high temperature has not yet been analyzed. In this paper, we attempted to clarify the importance of the morphology of a thermal stable PEEK separator in LIBs. Both finger-like (F-PEEK) and sponge-like (S-PEEK) structure were prepared via immersion precipitation and vapor-induced phase separation. Furthermore, a sponge-like structure with high pore connectivity was realized by addition of polyvinyl pyrrolidone (PVP) (S-PEEK/PVP). The intrinsic thermal resistance of PEEK attributes separators with dimension stability at 180 °C. Comparing to F-PEEK and S-PEEK, S-PEEK/PVP separator showed excellent electrolyte uptake, high porosity, high ionic conductivity (1.65 mS cm−1) and good electrochemical stability up to 5.5 V. Inferior performance of S-PEEK separator was probably caused by the low pore connectivity. At 45 °C, S-PEEK/PVP separator incorporated LIBs showed higher discharge capacity and better cycle property than LIBs with S-PEEK, F-PEEK and PP separators. Autopsy of failed LIBs with F-PEEK showed collapse of finger structure. For S-PEEK/PVP separator, intact anode material attributed to a capacity retention rate 97.9% after cycling for 150 cycles. The results indicated the importance of the sponge-like morphology for preparing the thermal stable separators for LIBs via phase inversion method.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (54)
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