Enhanced structural stability and overall conductivity of Li-rich layered oxide materials achieved by a dual electron/lithium-conducting coating strategy for high-performance lithium-ion batteries

Abstract

A dual coating of LATP and CNTs accelerates the transportation of Li+ and electrons, resulting in improved rate capability.

Li1.4Al0.4Ti1.6(PO4)3-Modified Li4Ti5O12 Anode for Lithium-Ion Storage with Enhanced Rate and Cycling Performance

“…At the same time, the LATP coating acts as a protective layer for LTO particles, suppressing interfacial side reactions and reducing capacity loss. 24 In addition, the electronic conductivity of the LATP−LTO is ameliorated by the possible reduction of Ti 4+ in the LATP during the electrochemical reaction. 12,14,25 However, excessive LATP also limits charge transport and ion diffusion by reason of the limited conductivity and extended ion transport pathways.…”

“…Wang et al used Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 as the pre-coating of LiCoO 2 and reacted them through thermal annealing to form a surface coating (composed of Co 3 O 4 , Co 2 TiO 4 /CoAl 2 O 4 , and Li 3 PO 4 ) to improve the high-pressure performance, chemical stability, and thermal stability of LiCoO 2 . In addition, Li 1+ x Al x Ti 2– x (PO 4 ) 3 is used as a modified layer component, acting as a barrier between the active material and electrolyte, protecting the active material and promoting Li + transmission. , There are few studies about the application of Li 1+ x Al x Ti 2– x (PO 4 ) 3 for anodes in comparison to cathodes. The electrochemical stability window range of Li 1+ x Al x Ti 2– x (PO 4 ) 3 is above 2.0 V. ,, When it is used for the modification of anode materials, it is possible to reduce impedance by reason of the reduction of Ti 4+ to Ti 3+ during the Li + insertion process, so that the modified materials exhibit better performance.…”

“…1 5 − 1 9 The Li 1+x Al x Ti 2−x (PO 4 ) 3 layers can stabilize the electrode/electrolyte interface and boost the rate and cycling performance. 19 Wu 20 strengthened the property of LiNi 0.5 Mn 23,24 There are few studies about the application of Li 1+x Al x Ti 2−x (PO 4 ) 3 for anodes in comparison to cathodes. The electrochemical stability window range of Li 1+x Al x Ti 2−x (PO 4 ) 3 is above 2.0 V. 12,14,25 When it is used for the modification of anode materials, it is possible to reduce impedance by reason of the reduction of Ti 4+ to Ti 3+ during the Li + insertion process, so that the modified materials exhibit better performance.…”

Improving the Electrochemical Performance of a Lithium-Rich Layered Cathode with an In Situ Transformed Layered@Spinel@Spinel Heterostructure

“…Based on the above analysis, the key issue to improve lithium-rich layered oxide performance is to inhibit the phase transition and the irreversible release of lattice oxygen during the initial cycle. A great many modification studies have been carried out to improve the electrochemical performance of lithium-rich layered oxides. ,, To overcome these problems, many approaches have been investigated, such as material pretreatment, − cationic doping, − anion doping, − surface coating, − and core–shell structure. − In all the above strategies, the core–shell structure has been extensively studied because of the fact that no inactive component is introduced and the synergistic effect between the core component and the shell component is beneficial to improve the performance of the electrode. On the one hand, shell components can protect the host material from electrolyte corrosion and reduce the interfacial side reactions.…”

Enabling Superior Electrochemical Performance of Lithium-Rich Li1.2Ni0.2Mn0.6O2 Cathode Materials by Surface Integration

“…Since the dawn of the renewable energy era, lithium-ion batteries have played a crucial role in the renewable energy field. − Among all cathode materials, lithium- and manganese-rich (LMR) layered cathode oxides with the chemical formula Li 2 MnO 3 –LiMO 2 (M = transitional metal) are regarded as the most promising cathodes because of their extraordinary specific capacities (>250 mA h g –1 ) at high potentials. − It is well known that the ultrahigh discharge specific capacities of LMR cathodes are ascribed to the joint participation of anions and cations in the redox reaction. The anionic redox reaction consists of irreversible gas release (O 2 ) at the surface region and a reversible redox reaction (O 2– /O 2 n – ) in the bulk region. , However, in fact, the irreversible gas release at the surface region is accompanied by crystal structural destruction and irreversible phase transformation (layered to spinel or rock-salt), causing capacity fading and voltage decay, and hence poor rate capability.…”