Lithium-rich antiperovskite (Li2Fe)SeO: A high-performance cathode material for lithium-ion batteries

Elucidating the electrochemical reaction mechanism of lithium-rich antiperovskite cathodes for lithium-ion batteries as exemplified by (Li2Fe)SeO

“…The observed thermal properties of (Li 2 Fe)SeO-BM are therefore in good agreement with the reported properties of (Li 2 Fe)SeO prepared by the solid-state reaction method. 3 We particularly note that our data imply that (Li 2 Fe)SeO antiperovskites possess superior thermal stability as compared to other commercial cathode materials 33 which may be advantageous for Li-ion battery performance at high operating temperatures.…”

“…3a) displays irregular, nearly spherical dominantly sub-micrometer-sized primary particles. Compared to (Li 2 Fe)SeO prepared by solid-state synthesis, 3 (Li 2 Fe)SeO-BM displays a strongly reduced particle size along with a narrower size distribution. In addition, minor particle agglomeration is visible in the SEM images of (Li 2 Fe)SeO-BM which we attribute to the cold welding phenomenon during the milling process.…”

“…2,13 We note the lower voltage of these features compared to (Li 2 Fe)SeO-SSR. 3 This shi towards lower voltages can be attributed to lower polarization due to the smaller particle sizes and corresponding smaller diffusion path length for Li + . [34][35][36] An anionic reaction of the contained chalcogen is proposed to take place in the highvoltage region O 2 , O * .…”

“…The new class of lithium-rich antiperovskites exhibits promising properties like low cost, non-toxic raw materials used, high lithium-diffusion and the possibility of multielectron storage per formula unit which renders them promising alternative cathode materials for LIB. [1][2][3][4] Among them, based on its superior multi-electron storage and cycling stability, selenium-containing lithium-rich antiperovskites such as (Li 2 Fe)SeO are regarded as particularly compelling, competitive cathode candidates. The full potential of antiperovskitebased cathodes could however, up to now, not completely be unleashed.…”

Mechanochemical synthesis of Li-rich (Li2Fe)SO cathode for Li-ion batteries

“…1,3 The recently reported (Li 2 Fe)SO cathode, which belongs to the Li-rich antiperovskites with the general formula (Li 2 TM)ChO (TM = Fe, Mn and Ch = S, Se), is a promising alternative with superior theoretical and practical specific capacities due to its multi-electron storage through cationic and anionic redox processes. [4][5][6][7] In addition, the antiperovskite (Li 2 Fe)SO has low cost and toxicity compared to Co-containing cathode materials, which can reduce the cost and environmental footprint of Li-ion batteries. [8][9][10][11] Numerous studies show approaches for recycling of Li-ion batteries including sulfur-containing materials as well.…”