Insights into the Capacity and Rate Performance of Transition‐Metal Coordination Compounds for Reversible Lithium Storage

Abstract

Coordination compounds are well‐known compounds that are being used as new materials for lithium storage because of their unique advantages, that is, designable structures, abundant active sites, and facile as well as mild synthetic routes. However, the electrode stability, low rate performance, and cycle life of coordination compounds are currently the main issues preventing their application as electrode materials, and the lithium‐storage mechanism in coordination networks is not well understood. Herein, isostructural one‐dimensional coordination compounds were synthesized to study their lithium‐storage performance. Co‐HIPA and Ni‐HIPA showed superior electrolyte stability than other M‐HIPAs, and Co‐HIPA displayed a superior reversible capacity and cycle stability, excellent rate performance, and clear voltage platform. DFT calculations and kinetic analysis revealed the influence of the metal center with different electronic structures on the lithium‐storage mechanism.

Hydrogen‐bonded Complex‐based Frameworks for Stable Lithium Storage

“…The electron density distributions of Co‐OPCA and Ni‐OPCA are depicted in Figure 3d. Co(II) contains more electrons at the Fermi level than Ni(II), [16] resulting in a higher electron density of Co‐OPCA. Considering the experimental capacity at 100 mA g −1 , Co‐OPCA can achieve a theoretical capacity of 87.3%, which is higher than 85.2% of Ni‐OPCA.…”

“…Recently, metal‐complex‐based materials with different dimensionalities were studied as potential anode materials [15–22] . An example is demonstrated by the one‐dimensional (1D) Ni‐HIPA, which displays exceptional cycle life and rate performance, delivering a capacity of 504 mAh g −1 at 5000 mA g −1 [16] .…”

“…Recently, metal‐complex‐based materials with different dimensionalities were studied as potential anode materials [15–22] . An example is demonstrated by the one‐dimensional (1D) Ni‐HIPA, which displays exceptional cycle life and rate performance, delivering a capacity of 504 mAh g −1 at 5000 mA g −1 [16] . Two‐dimensional (2D) Cu‐HHTQ facilitated the transport of lithium‐ion and electrons in a 2D plane, and the material exhibited a high capacity of 657.6 mAh g −1 when tested at 600 mA g −1 [18] .…”

The Influence of Light‐Generated Radicals for Highly Efficient Solar‐Thermal Conversion in an Ultra‐Stable 2D Metal‐Organic Assembly

“…[54] As a combination of the above analysis, the photoinduced radicals not only influence the bond structure but also increase the spin density of NKU-123, resulting in enhanced photoinduced electron vibration, thereby enhancing the photothermal effect. [55][56][57] In NKU-123, the interaction between the electron spin and lattice vibrations can result in spin-lattice interactions, which can impact the material's thermal conductivity, thermal relaxation and thermal stability, thereby influencing the efficiency of absorbing and converting solar energy. [58,59]…”