Реферат: In recent years, new classes of lithium-excess cathode and anode materials with disordered rock-salt structure (DRX), in which any channels for Li+ ion diffusion are absent, have attracted increased interest. In DRX cathode materials of Li y (Me1Me2)2- y O2 composition, Li+ and transition metal ions (Me) are equally likely to occupy the same octahedral positions in the lattice, and the diffusion of Li+ ions occurs by hopping from one octahedron to another through an intermediate tetrahedron (o-t-o diffusion). The presence of fluorine in oxyfluorides DRX-F (Li1+ x (MeMn3+)1- x O2- y F y , where Me = Ti4+, Nb5+) affects the local ordering of Mn3+ ions, the stability of the redox couple O2-/O- and its contribution into specific capacity. On the other hand, high-entropy oxides (HEO), which are single-phase oxide systems containing five and more cations, were synthesised by mixing five oxides CoO, CuO, MgO, NiO and ZnO in equimolar ratios, followed by thermal treatment at 1000 °C. Stabilisation of single-phase solid solutions Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O and Li x (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)2- x O2- x F x (0 ≤ x ≤ 1) with a rock-salt crystal structure turned out to be possible due to the large contribution of the entropy of mixing to the Gibbs free energy. Another group of anode materials are high-entropy oxides with a spinel structure (HES), for example (Cr0.2Fe0.2Mn0.2Co0.2Ni0.2)3O4 obtained by solid-state synthesis at T = 500-1000 °C in air. After ball grinding, the particle size is reduced to 20 nm. The initial specific capacity during cycling in the 0.01-3.0 V range is 1333.6 mA×h/g and decreases to 329.9 mA×h/g after 20 cycles. A comparative investigation of synthesis conditions, crystal structure, morphology and electrochemical characteristics has been carried out for the four classes of high-entropy oxides: 1) Li y (MeMn3+)2- y O2, где Me = Ti4+, Nb5+; 2) Li1+ x (MeMn3+)1- z O2- y F y , где Me = Ti4+, Nb5+; 3) Li x (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)2- x O1- x F x ; 4) (Cr,Fe,Mn,Co,Ni)3O4.

Библиографическая ссылка: Kosova N.V.
Cation-Disordered and High-Entropy Oxides/Oxyfluorides as Electrode Materials for Lithium-Ion Batteries
Chemistry for Sustainable Development. 2024. V.32. N5. P.599-610. DOI: 10.15372/CSD2024594 WOS РИНЦ OpenAlex

Оригинальная версия: Косова Н.В.
Катион-разупорядоченные и высокоэнтропийные оксиды/оксифториды в качестве электродных материалов для литий-ионных аккумуляторов
Химия в интересах устойчивого развития. 2024. Т.32. №5. С.618-629. DOI: 10.15372/KhUR2024594 РИНЦ CAPlus OpenAlex

Даты:

Поступила в редакцию:	25 апр. 2024 г.
Принята к публикации:	30 авг. 2024 г.
Опубликована online:	16 янв. 2025 г.

Идентификаторы БД:

Web of science:	WOS:001402758400001
РИНЦ:	79629421
OpenAlex:	W4408944370

Альметрики: