An oxygen-deficient Li₂ZnTi₃O₈anode for high-performance lithium storage

Abstract

The Li-storage mechanism of LZTO with oxygen vacancies has been revealed via experiments and first-principles calculations.

Li2ZnTi3O8anode: design from material to electrode and devices

“…Our group synthesized Nb-doped, La-doped, and oxygen-deficient LZTO (LZTO-FA). 26,46,47 The ever-increasing trend of the specific capacities before 150–200 cycles for the three samples may originate from the continuous decomposition of the electrolyte and the appearance of the new active materials for Li 2 Ti 3 O 7 and ZnO (Fig. 4).…”

“…Our group synthesized defective LZTO anodes with different concentrations of OVs by controlling the sintering atmospheres. 26 The effects of OVs on LZTO were systematically investigated via experiments and first-principles calculations. The diffusion barriers of Li + ions decreased for LZTO with an appropriate concentration of OVs synthesized in flowing air (LZTO-FA) and increased for LZTO with excess OVs synthesized in N 2 (LZTO-FN) (Fig.…”

“…To date, the LZTO anode has been combined with various cathode materials to build full cells, such as LiFePO 4 , 91 LiMn 2 O 4 , 110 LiNi 0.5 Mn 1.5 O 4 , 26,92,127 and LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathodes. 136…”

“…However, the commercial application of Si is hindered for the low intrinsic conductivity, huge volume change, and the severe particle/electrode pulverization and interfacial side reactions. 23,24 Lithium zinc titanate (Li 2 ZnTi 3 O 8 , LZTO) as a novel Tibased anode has many advantages: 25,26 (1) Compared with LTO, LZTO has relatively large specific capacity of 229 mA h g −1 . (2) The high discharge voltage plateaus at ∼0.5 and 1 V can restrict the formation of lithium dendrites and then guarantee the excellent safety of the LIBs.…”

“…Lithium zinc titanate (Li 2 ZnTi 3 O 8 , LZTO) as a novel Ti-based anode has many advantages: 25,26 (1) Compared with LTO, LZTO has relatively large specific capacity of 229 mA h g −1 . (2) The high discharge voltage plateaus at ∼0.5 and 1 V can restrict the formation of lithium dendrites and then guarantee the excellent safety of the LIBs.…”