Journal
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
Volume 1, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/aesr.202000025
Keywords
all-solid-state Li-ion batteries; electrode materials; grain boundary resistance; high formability; Li-ion diffusivity
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Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST), Japan
- Ministry of Education Culture, Sports, Science and Technology, Japan (MEXT) [18K19129, 18H01707, 19H05815, 19K15657, 20H02436]
- MEXT [JPMXP0112101003, JPMXP1020200301]
- Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [20H02436, 19K15657, 18H01707, 18K19129] Funding Source: KAKEN
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Materials with high formability and Li-ion diffusivity are desired to realize safe bulk-type all-solid-state Li-ion batteries with high energy density. Spinel-type Li2FeCl4, which is expected as a Li-ion-conductive electrode, adopts the high-temperature cubic phase (space group: Fd-3m) by a mechanochemical synthesis method. The powder-compressed pellet shows a high relative density of 92% and large neck formation between the particles. An analysis of the distribution of relaxation times from the AC impedance results indicates that the contribution of the grain boundary impedance is almost negligible (approximate to 3%) in the powder-compressed pellet. Even the Li diffusion coefficient, which is underestimated by the Nernst-Einstein equation, is several orders of magnitude higher than those of conventional oxide and sulfide electrode materials. Analyzing the diffusion pathways using a classical force field calculation suggests that stabilizing the high-temperature phase at room temperature delocalizes Li ions in the diffusion pathway, thus realizing high Li-ion diffusivity. The Li2FeCl4 green compact containing 10wt% carbon as an electron-conductive additive shows a one-electron charge reaction with a capacity of 126mAhg(-1), with no large overpotential at a high operating voltage of 3.6V versus Li/Li+ at 30 degrees C.
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