Layered Ni-rich Cathode Materials

Myung, Seung Taek; Jo, Chang Heum; Konarov, Aishuak

doi:10.1039/9781788016124-00026

Cited by 2 publications

(1 citation statement)

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“…Lithium-ion batteries (LIBs) are one of best solutions for power sources for handheld electronics, electric vehicles (EV), and energy storage systems (ESS) because of their high energy density and excellent cycle performance. − However, with the continuous increase in demand for LIBs and resource limitations, the development of next-generation secondary battery systems that can replace lithium secondary batteries is necessary. − Potassium-ion batteries (KIBs) are a promising alternative because of the abundance of potassium resources and the similar electrode potentials of potassium and lithium (Li = −3.04 V and K = −2.93 V versus the standard hydrogen electrode (SHE)). − Even though the monovalent-alkali-ion charge carriers participate in similar intercalation, conversion, and alloy reactions, the large ionic radius of K + (1.37 Å) relative to that of Li + (0.76 Å) tends to impede facile ion transfer, resulting in lower capacities than those in the lithium system. − The resulting specific capacities of anodes for KIBs are lower than those of anodes for LIBs and sodium-ion batteries (SIBs), irrespective of their chemistries (Table ). For insertion compounds, almost all the compounds suffer from capacities below 300 mAh g –1 .…”

Section: Introductionmentioning

confidence: 99%

Oxalate-Based High-Capacity Conversion Anode for Potassium Storage

Choi

et al. 2020

ACS Sustainable Chem. Eng.

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Conversion anode materials have been applied in lithium and sodium secondary batteries owing to their high capacities; however, there are limited reports on their use in potassium-ion batteries. Herein, we introduce cobalt oxalate as a high-capacity anode material for potassium storage. Carbon nanotubes are encapsulated by long CoC2O4 sticks (∼5 μm in length) to establish a facile electron transport path, resulting in a specific charge (oxidation) capacity of 394 mAh g–1 (80 mA g–1, 0.2C) with a capacity retention of 73% over 200 cycles. Moreover, the composite electrode is active at a rate of 3C (1.2 A g–1), with a charge capacity of 161 mAh g–1. In situ X-ray diffraction, X-ray absorption spectroscopy, and time-of-flight secondary-ion mass-spectroscopy studies reveal the occurrence of the conversion reaction CoC2O4 + 2K+ + 2e– → Co + K2C2O4 on reduction, which reversibly occurs on oxidation. Microscopic studies demonstrate that the conversion reaction occurs on the carbon nanotubes where the CoC2O4 sticks are suited, indicating that the carbon nanotubes assist in facile electron transfer and enable the reversibility of the conversion reaction.

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