Improving Electrochemical Performance of NMC622 Cathode by Coating with Cr2O3 Nanopowders and Modified Current Collector

Developments, Novel Concepts, and Challenges of Current Collectors: From Conventional Lithium Batteries to All‐Solid‐State Batteries

“…Sometimes, a well‐designed pre‐strain layer can suppress electrode degradation by delaying the debonding between active electrode materials and current collectors onset and reduce the debonding size (Figure 2 a, b) [46–50] . Surface modification of current collectors is believed to be able to alleviate the critical mechanism for lithium batteries fading, namely the interfacial debonding between the active layer and the current collector [29,50] . Compared with traditional metal foil, carbon‐coated metal foil always exhibits good electrical conductivity, high specific surface area, oxidation resistance, and better deformability than bare metal foil [51] .…”

“…Figure 1 summarized the current collectors applied in different kind of Li‐ion batteries and their specific requirement on the current collectors. In general, researches have shown that decreasing contact resistance, improving the electrical conductivity, and enhancing the corrosion resistance of current collectors are essential for enhancing the rate capability, capacity performance, efficiency performance, and cycle stability of lithium batteries [28,29] …”

“…In general, researches have shown that decreasing contact resistance, improving the electrical conductivity, and enhancing the corrosion resistance of current collectors are essential for enhancing the rate capability, capacity performance, efficiency performance, and cycle stability of lithium batteries. [28,29] Nevertheless, various current collector materials face their own practical predicaments and fall short of meeting the aforementioned array of multiscale requirements. Sophisticated current collectors comprised of diverse materials and boasted meticulously crafted morphologies have been innovated.…”

Rational Design of Multifunctional Surface Modification for Ni-Rich Layered Cathodes of Lithium-Ion Batteries

“…Since CEI layers have low electronic conductivity but high ionic conductivity, they can suppress decomposition of the electrolytes by preventing contact between the electrolyte and LNCM cathode. 36,37 Precursors with low electrical conductivity, such as Al 2 O 3 , 38 SiO 2 , 39 and Cr 2 O 3 , 40 have been reported to be effective at forming the CEI layers. In addition, several investigations have revealed that interfacial stability can be improved by coating Li + conductors, such as Li 2 ZrO 3 41 and Li 2 TiO 3 , 42 which can minimize decreases of specific capacity.…”

“…Many strategies have been attempted in the literature to alleviate the hurdles of Ni-rich LNCM cathode materials, such as (1) incorporating surface coating layers; , (2) use of electrolyte additives; , (3) use of dopant-functionalized cathode materials; , and (4) development of single-crystalline LNCM cathode materials. , It is worth mentioning that the surface coating approach is based on the formation of cathode–electrolyte interphase (CEI) layers at the LNCM interface. Since CEI layers have low electronic conductivity but high ionic conductivity, they can suppress decomposition of the electrolytes by preventing contact between the electrolyte and LNCM cathode. , Precursors with low electrical conductivity, such as Al 2 O 3 , SiO 2 , and Cr 2 O 3 , have been reported to be effective at forming the CEI layers. In addition, several investigations have revealed that interfacial stability can be improved by coating Li + conductors, such as Li 2 ZrO 3 and Li 2 TiO 3 , which can minimize decreases of specific capacity.…”