Preparation of LLZTO-coated Lyocell fibers as non-woven separator for lithium-ion battery
In order to solve the problem of uneven pore size distribution existed in non-woven separators in lithium-ion batteries,the wet-laid non-woven substrate was prepared by fibrillated Lyocell fibers and combined with Li64La3Zr14Ta06O12(LLZTO)oxide solid electrolyte coating,which narrowed the pore size and distribution.As a result,the internal resistance of the battery was reduced,and the electrochemical performance was improved.Combined with the solid electrolyte coating,the nonwoven substrates prepared by Lyocell fibrillated fibers with low beating revolutions caused a large amount of the ceramics to permeate through the substrate side,but it had no effect on the battery cycle and rate performance after assembly.The coated non-woven membrane(LC10)assembled with the lithium cobalt oxide full battery had a low polarization voltage after cycling,and its capacity retention reached 85.93％under 3C high rate cycles due to its high ion transference number,low ohmic resistance and charge transfer resistance.The low temperature performance of the non-woven separator without solid electrolyte coating was worse than that of the commercial sample,and lithium plating was more serious than that of the commercial sample.The initial capacity of LC10 at low temperature reached 124.9 mAh/g,and the capacity retention was 94.23％.
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