Construction of CoS2 nanoparticles embedded in well-structured carbon nanocubes for high-performance potassium-ion half/full batteries

Self-templated construction of peanut-like P3-type K0.45Mn0.5Co0.5O2 for highly reversible potassium storage

“…5–9 Compared with SIBs, PIBs are more likely to possess high energy density because the redox potential of K/K + (−2.93 V) is lower than that of Na/Na + (−2.71 V) and close to that of Li/Li + (−3.04 V), and seem to be the most promising alternative to LIBs in the large-scale energy storage field. 10–14 Notably, extensive research has been reported to explore high-performance anode materials, such as carbonaceous materials, 15–18 MXenes, 19 transition metal sulfides, 20–23 and alloys. 24–28 Compared with the widely available anode materials, only a limited amount of cathode materials have been reported for PIBs because of rigorous intercalation conditions arising from the larger size of K + .…”

Anti‐Aggregation of Nanosized CoS2 for Stable K‐Ion Storage: Insights into Aggregation‐Induced Electrode Failures

“…[ 15 ] During the anodic process, three broad peaks at 1.01, 1.98, and 2.40 V are caused by the extraction of K + to form CoS 2 . [ 13 ] Markedly, the CV curves of subsequent cycles almost overlap, revealing the excellent reversibility of the CoS 2 ‐CNs electrode. The initial discharge–charge profiles of the two samples are shown in Figure 2b and Figure S9, Supporting Information.…”

“…[ 5b ] In the case of S 2p (Figure 1h), the high‐resolution spectrum can be divided into four peaks at 161.3, 163.1, 164.5, and 168.4 eV, assigned to CS, CoS 2p 3/2 , CoS 2p 1/2 , and oxidized S, respectively, consistent well with previous reports. [ 13 ] The carbon content of CoS 2 and CoS 2 ‐CNs was measured by thermogravimetric analysis (TGA) under air atmosphere. As shown in Figure S7b, Supporting Information, the residue after heat treatment corresponds to Co 3 O 4 , and thus the carbon content of CoS 2 and CoS 2 ‐CNs can be calculated to be 16.8% and 44.1% (Equation S1, Supporting Information), respectively, indicating the successful coating with carbon shells for CoS 2 ‐CNs.…”

Bi@C Nanospheres with the Unique Petaloid Core–Shell Structure Anchored on Porous Graphene Nanosheets as an Anode for Stable Sodium- and Potassium-Ion Batteries

“…Lithium-ion batteries (LIBs) have become one of the most advanced storage systems in the fields of portable electronic devices, power tools, and electric vehicles because of the remarkable advantages of high energy density and stable cycling performance. , However, the low content and uneven distribution of lithium in the earth’s crust will affect its price and availability eventually leading to limited development of LIBs in the future. , Therefore, sodium/potassium-ion battery (SIB/PIB) systems as considerable alternatives to LIBs have received more interest due to the more plentiful reserves and more affordable cost of the sodium/potassium element than the lithium element. − Furthermore, lithium, sodium, and potassium belong to the same main group and have similar chemical–physical characteristics so that SIBs and PIBs exhibit similar energy storage mechanisms to LIBs in the charge and discharge processes. , Therefore, the development of electrode materials of SIBs and PIBs with high capacity and stable cycle life is crucial for energy storage application. − However, the most huge obstacle to the development of SIBs and PIBs is the larger atomic radii of sodium and potassium, thus leading to the slower diffusion kinetics in the electrode material. As a result, it is easy to cause huge volume expansion of the anode material and damage of its structure during charging and discharging processes, , which results in the battery capacity decreasing rapidly with poor life and cycling stability.…”