In situ doping polyanions enables concentration-gradient Ni-rich cathodes for long-life lithium-ion batteries

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F23%3A63571819" target="_blank" >RIV/70883521:28610/23:63571819 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acs.energyfuels.3c03390" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.energyfuels.3c03390</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.energyfuels.3c03390" target="_blank" >10.1021/acs.energyfuels.3c03390</a>

Jazyk výsledku

angličtina

Název v původním jazyce

In situ doping polyanions enables concentration-gradient Ni-rich cathodes for long-life lithium-ion batteries

Popis výsledku v původním jazyce

The novel Ni-rich cathode materials with concentration-gradient structures have become a research hotspot by virtue of their advantages of high specific capacity and thermal stability. However, the unfavorable interdiffusion of transition metals (TMs) during lithiation leads to flattening of the gradient and weakens the surface passivation effect. Herein, we successfully constructed a concentration-gradient nickel-rich cathode with an average composition of LiNi0.83Co0.05Mn0.12O2 via a SiO44– polyanion doping strategy (GNCM-Si). SiO44– doping allows the preservation of the concentration-gradient structure at high lithiation temperatures by hindering TM (Ni, Mn) interdiffusion, ensuring high surface stability of nickel-rich cathodes at the end of charge. Besides, the strong Si–O bond effectively stabilizes the lattice oxygen framework, thereby reducing oxygen evolution and further enhancing thermal stability. Accordingly, the as-obtained concentration-gradient cathode demonstrates a high reversible specific capacity of 210.5 mA h g–1 and a high Coulombic efficiency of 89.7% at 0.1C. Impressively, it retains 92.7% of its initial capacity after 500 cycles in pouch-type full cells at 25 °C and 1C. This finding offers a viable idea for constructing concentration-gradient cathodes to meet the high safety requirements of lithium-ion batteries.

Název v anglickém jazyce

In situ doping polyanions enables concentration-gradient Ni-rich cathodes for long-life lithium-ion batteries

Popis výsledku anglicky

The novel Ni-rich cathode materials with concentration-gradient structures have become a research hotspot by virtue of their advantages of high specific capacity and thermal stability. However, the unfavorable interdiffusion of transition metals (TMs) during lithiation leads to flattening of the gradient and weakens the surface passivation effect. Herein, we successfully constructed a concentration-gradient nickel-rich cathode with an average composition of LiNi0.83Co0.05Mn0.12O2 via a SiO44– polyanion doping strategy (GNCM-Si). SiO44– doping allows the preservation of the concentration-gradient structure at high lithiation temperatures by hindering TM (Ni, Mn) interdiffusion, ensuring high surface stability of nickel-rich cathodes at the end of charge. Besides, the strong Si–O bond effectively stabilizes the lattice oxygen framework, thereby reducing oxygen evolution and further enhancing thermal stability. Accordingly, the as-obtained concentration-gradient cathode demonstrates a high reversible specific capacity of 210.5 mA h g–1 and a high Coulombic efficiency of 89.7% at 0.1C. Impressively, it retains 92.7% of its initial capacity after 500 cycles in pouch-type full cells at 25 °C and 1C. This finding offers a viable idea for constructing concentration-gradient cathodes to meet the high safety requirements of lithium-ion batteries.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Energy and Fuels

ISSN

0887-0624

e-ISSN

1520-5029

Svazek periodika

37

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

"17553−17560"

Kód UT WoS článku

001141288400001

EID výsledku v databázi Scopus

2-s2.0-85178187851