Batteries often charge and discharge at high rates, and the internal temperature of the battery is prone to rise. This results in a severe contraction of the lithium-ion battery diaphragm, which can cause a short circuit in direct contact with the positive and negative electrodes of the battery.
The film properties of lithium-ion batteries determine the capacity, cycling stability, and other important battery characteristics, and therefore the diaphragm must have an adequate thickness, ionic conductivity, high porosity, and both thermal and electrochemical stability [4, 5, 6].
Abusive lithium-ion battery operations can induce micro-short circuits, which can develop into severe short circuits and eventually thermal runaway events, a significant safety concern in lithium-ion battery packs. This paper aims to detect and quantify micro-short circuits before they become a safety issue.
The PU/PAN fiber diaphragms showed a good electrolyte affinity, and the excellent electrochemical stability of PU/PAN composite diaphragm allows it to have better compatibility with the cathode material in lithium-ion batteries, which can be applied to work in adverse environments, such as high voltage. Figure 9.
A high electrochemical stability window facilitates the long-term stable operation of Li-ion batteries at a high voltage. To evaluate the electrochemical stability of the diaphragm, the potential range was set to 2.5 V–6.0 V to perform LSV tests on the Celgard 2400 and PU/PAN fiber diaphragms.
Conclusions A centrifugal spinning method was used to prepare a PU/PAN lithium-ion battery diaphragm by blending with different ratios of PAN. The properties of the PU/PAN lithium-ion battery diaphragms were characterized in this study.
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Batteries often charge and discharge at high rates, and the internal temperature of the battery is prone to rise. This results in a severe contraction of the lithium-ion battery diaphragm, which can cause a short …
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