Preparation and battery performance of polyimide/hydroxyethyl cellulose composite nanofiber membrane

doi:10.19491/j.issn.1001-9278.2024.11.008

Abstract

Abstract:

Polyimide （PI）/hydroxyethyl cellulose （HEC） nanofiber composite membranes were prepared via in⁃situ integrated reinforcement modification using HEC as a functional modification material for PI nanofiber membranes. The strength of PI nanofibers membrane was increased due to the bonding and coating of the PI nanofibers with HEC， and the polar functional groups of HEC were uniformly distributed on the surface of PI nanofibers to act as functional sites for realizing the regulation of lithium⁃ion flow. The results indicated that the introduction of HEC could endow the PI/HEC membranes with excellent tensile strength of 58.65 MPa， high wettability along with a contact angle of 14.31°， a high ion conductivity of 1.63 mS/cm， and a high lithium⁃ion transfer number of 0.58. The battery equipped with the PI/HEC composite membranes showed high discharge capacities of 170.1 and 135 mAh/g at 0.1 C and 2 C， respectively， a capacity retention rate of 69.43 % after 100 cycles at 1 C， and a Coulomb efficiency of nearly 100 %. In addition， the results from the lithium deposition test at 1 mA/cm²indicated the potential of the battery was lower than 0.23 V after 600 h. The density function theory calculation results indicated that HEC has a higher binding energy for lithium ions， confirming that the functional site of HEC can regulate lithium ions to inhibit lithium dendrites.

Key words: polyimide, hydroxyethyl cellulose, nanofiber membrane, separator, lithium dendrite

CLC Number:

TQ324.8

HU Jiaai, ZHANG Yiqing, XU Jiahe, LI Qiaoli, FENG Xixi, XU Xuan, LI Xinao, NI Tianheng, HOU Lianlong, MA Haikun, SUN Guohua. Preparation and battery performance of polyimide/hydroxyethyl cellulose composite nanofiber membrane[J]. China Plastics, 2024, 38(11): 47-52.

Figures/Tables 10

Fig.1. FTIR spectra of the PI fiber membrane and PI/HEC separator

样品	厚度/μm	孔隙率/%	吸液率/%
PI/HEC	23.0	73.6	381.5
Celgard	25.0	38.0	91.0

Tab.1. Physical properties of the Celgard separator， PI nanofiber separator and PI/HEC separator

Fig.2. Micromorphology of the PI fiber membrane and PI/HEC composite separator

Fig.3. Stress⁃strain curves of the PI fiber membrane and PI/HEC separator

Fig.4. Wettability of the Celgard separator and PI/HEC composite separator

Fig.5. TG curves of the Celgard separator and PI/HEC composite separator

Fig.6. Ignition and dimensional stability test results of the Celgard and PI/HEC separator

Fig.7. Electrochemical impedance and migration number test results of the Celgard and PI/HEC separator

Fig.8. Magnification and cycle test results of the Celgard and PI/HEC separator

Fig.9. Lithium deposition test results of the Celgard and PI/HEC separator and binding energy of HEC and PP with lithium ion

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