Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 35, Pages 31991-31996Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10160
Keywords
LiNi0.8Co0.15Al0.05O2; gradient cathode; cation mixing; phase transition; solid-state battery
Funding
- National Natural Science Foundation of China [51571182, 51001091]
- Fundamental Research Program from the Ministry of Science and Technology of China [2014CB931704]
- Program for science & talents in Henan Province [18HASTIT009, 182102310815, 2017GGJS001]
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A LiNi0.8Co0.15Al0.05O2(NCA) solid battery was assembled by coupling an NCA cathode with a polyvinylidene fluoride (PVDF)/Li(6.75)La(3)Z(1.7)Ta(0.25)O(12) (LLZTO) composite polymer electrolyte and a Li anode. A NiO-like phase transition is regarded as the reason for interface impedance, which leads to drastic capacity fading during cycling. A gradient cathode with excessive addition of Li-6.75 La3Zr1.75Ta0.25O12 was fabricated at the cathode/electrolyte interface to overcome the increased impedance. Using high-resolution transmission electron microscopy and electron energy loss spectra, the formation of a unique localized cation migration (LCM) region was confirmed on the NCA surface. The formation of an LCM region hindered further distortion and enhanced the capacity retention of the spinel lattice.
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