To increase the specific capacity and conductivity of lithium titanate, low-cost and environmentally friendly carbon quantum dots (CQDs) were used to composite with Al3+ and Mn4+ co-doped Li4Ti5O12 (LTO-Al/Mn) to improve its electrical properties.
Nitrogen‐doped hollow carbon nanofibers (N‐HCNFs) synthesized by nozzle‐less electrospinning were directly obtained, showing a rough surface and hollow structure. The as‐prepared N‐HCNFs exhibit excellent electrocatalytic activity, good stability and low detection limit, which is a promising alternative applications in environmental protection.
Poly(vinylidene fluoride) (PVDF)
gel polymer electrolytes (GPEs)
show great potential for application in lithium-ion batteries (LIBs)
due to their outstanding characteristics. However, the inferior thermal
stability and low ionic conductivity limit their practical application.
Herein, γ-LiAlO2 was synthesized and applied in a
polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)-polybenzimidazole
containing an ether bond (OPBI)-polyoxyethylene (PEO) (PHOP-LAO) GPE
for improving its thermal stability and ionic conductivity properties.
The ionic conductivity of PHOP-LAO is 4.83 mS cm–1, which increased by 210% compared with that of the PHOP sample.
It is worth noting that the thermal shrinkage of the PHOP-LAO membrane
is greatly reduced (less than 1% at 230 °C for 1 h). PHOP-LAO
shows outstanding thermal stability, which is beneficial for the safety
of LIBs. When the PHOP-LAO GPE was applied to LIBs with Li1.04Ni1/3Co1/3Mn1/3O2 as
a cathode, the LIBs exhibit remarkable and stable cycling performance
with a discharge capacity retention rate of 85% after 500 cycles at
a 2 C rate and maintain a power capability retention rate of up to
77% of the initial capability at the high rate of 10 C (50 °C).
PHOP-LAO thus shows great potential for achieving ultra-stable and
safe LIBs in the future.
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