Functional Passivation Interface of LiNi_0.8Co_0.1Mn_0.1O₂ toward Superior Lithium Storage

Abstract

The fast capacity/voltage fading with a low rate capability has challenged the commercialization of layer‐structured Ni‐rich cathodes in lithium‐ion batteries. In this study, an ultrathin and stable interface of LiNi0.8Mn0.1Co0.1O2 (NCM) is designed via a passivation strategy, dramatically enhancing the capacity retention and operating voltage stability of cathode at a high cut‐off voltage of 4.5 V. The rebuilt interface as a stable path for Li+ transport, would strengthen the cathode–electrolyte interface stability, and restrain the detrimental factors for cathode–electrolyte interfacial reactions, intergranular cracking and irreversible phase transformation from layered to spinel, even salt‐rock phase. The as‐optimized NCM displays a higher cyclability (i.e., 206.6 mA h g−1 at 0.25 C (50 mA g−1) with 92.0% capacity retention over 100 cycles) and a better rate capability (141.0 and 112.6 mA h g−1 at 12.5 and 25 C, respectively) than pristine NCM (205.0 mA h g−1 with 73.0% capacity retention at 0.25 C; 120.9 and 93.1 mA h g−1 at 12.5 and 25 C, respectively).

Surface Reconstruction of Ni‐Rich Layered Cathodes: In Situ Doping versus Ex Situ Doping

“…[ 4–7 ] Therefore, the NCM are currently considered as the most promising cathode materials for LIBs. [ 8–10 ] However, there are some shortcomings which need to be addressed, such as cation mixing, further phase transformation and surface reconstruction, interfacial side reaction, moisture/air‐reactive lithium residues, etc., which not only contribute to initial capacity decay, but also bring about poor thermal stability and reduced cycle life. [ 4,11,12 ] In summary, most of these problems are mainly initiated at cathode surface, and the stability of this region largely determines the electrochemical performance of the cell.…”

“…[ 4,11,12 ] In summary, most of these problems are mainly initiated at cathode surface, and the stability of this region largely determines the electrochemical performance of the cell. [ 4,9,13 ]…”

Wood‐Derived Integral Air Electrode for Enhanced Interfacial Electrocatalysis in Rechargeable Zinc–Air Battery

“…[21,22] Construction of a maximal TPB region on the cathode by interfacial engineering is a practical strategy to improve the ZAB performance by exposing more catalytic active sites because only active sites located at the interface region can be fully effective. [23,24] A nearly two-dimensional (2D) triple-phase interface is created in a very narrow region on the catalyst layer in the cathode prepared by spraying and dripping catalysts on the surface of carbon paper. [25,26] To address the problem of insufficient TPB exposure of conventional electrodes, a threedimensional interfacial strategy is proposed.…”

“Three‐in‐One” Multi‐Level Design of MoS2‐Based Anodes for Enhanced Sodium Storage: from Atomic to Macroscopic Level

“…[ 1 ] Among them, lithium‐ion batteries (LIBs) took the lead since their global production and manufacturing scale have reached an unprecedented level. [ 2–6 ] However, LIBs cannot meet the demand of grid‐level large‐scale application due to the limited lithium reserve. [ 7,8 ] Sodium ion batteries (SIBs) have attracted intense attention as one of promising next‐generation batteries due to the rich reserve and low cost of sodium resource, [ 9,10 ] wide temperature range adaptability, and good safety.…”

“…[1] Among them, lithium-ion batteries (LIBs) took the lead since their global production and manufacturing scale have reached an unprecedented level. [2][3][4][5][6] However, LIBs cannot meet the demand of grid-level large-scale application due to the limited lithium reserve. [7,8] Sodium ion batteries electron transport, and structural stability in the whole electrode.…”