Dual-Modified Li₄Ti₅O₁₂ Anode by Copper Decoration and Carbon Coating to Boost Lithium Storage

Abstract

The low electronic conduction of Li 4 Ti 5 O 12 negative materials for Li-ion batteries leads to unsatisfactory electrochemical performance. Here, we report a Li 4 Ti 5 O 12 anode modified by copper decoration and carbon coating to simultaneously boost the Li-ion storage capacity and rate capabilities. The optimal Li 4 Ti 5 O 12 anode reveals a remarkable reversible Li-ion storage capacity (285.3 mAh g −1 when cycled at 100 mA g −1 for 100 cycles) and significantly improved rate capabilities compared to pristine Li 4 Ti 5 O 12 . When cycled at 1000 mA g −1 , a reversible capacity of 189.4 mAh g −1 is retained after 500 cycles. The greatly enhanced electrochemical property is attributed to the dual effect of the carbon coating and copper decoration, which promotes the whole electronic conductivity.

Hybrid nanotubes constructed by confining Ti0.95Nb0.95O4 quantum dots in porous bamboo-like CNTs: superior anode materials for boosting lithium storage

“…40 It is worth mentioning that the electrochemical performance of the TN electrode was higher than that of the Li 4 Ti 5 O 12 and Ti–Nb–O based nanocomposites reported in the open literature (Table 2). 9,10,32,39–47…”

“…Moreover, the presence of the SEI layer not only improves the mechanical cohesion of the active material, but also enables the storage of additional lithium ions. 40 It is worth mentioning that the electrochemical performance of the TN electrode was higher than that of the Li 4 Ti 5 O 12 and Ti-Nb-O based nanocomposites reported in the open literature (Table 2). 9,10,32,[39][40][41][42][43][44][45][46][47] Moreover, the rate performance of TN was tested under the current densities from 0.5 to 8.0 A g −1 .…”

“…40 It is worth mentioning that the electrochemical performance of the TN electrode was higher than that of the Li 4 Ti 5 O 12 and Ti-Nb-O based nanocomposites reported in the open literature (Table 2). 9,10,32,[39][40][41][42][43][44][45][46][47] Moreover, the rate performance of TN was tested under the current densities from 0.5 to 8.0 A g −1 . When the current density is restored to the small current of 0.5 A g −1 , the capacity has almost no change, showing a good rate perform-ance (Fig.…”

Perspectives onLi‐ionbattery categories for electric vehicle applications: A review of state of the art

“…In Reference 152 the authors added a 2 nm carbon coating to the LTO electrode, increasing cyclic performance. This technique can also be used to increase battery power storage capacity 153 …”