In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 50, No. 46 ( 2021), p. 17052-17061
Abstract:
The rational design of the unique morphology of particles has been considered as the key to improving the structural stability of spinel LiMn 2 O 4 cathode materials for Li-ion batteries. Herein, a facile solid-state combustion process, combined with a Cr and Al co-doping approach, is proposed to prepare various LiCr 0.01 Al x Mn 1.99− x O 4 ( x ≤ 0.10) cathode materials with a good crystallinity. Cr and Al co-doping facilitates the formation of a single crystal truncated octahedral morphology. This endows the as-prepared LiCr 0.01 Al x Mn 1.99− x O 4 with abundant {111} planes for Mn dissolution reduction and a few {100} and {110} planes for Li + ion fast diffusion channels. Moreover, the introduction of Cr and Al elements with a stable electronic configuration further boosts the structural stability of the spinel LiMn 2 O 4 owing to the relatively robust Al–O and Cr–O bonds compared with the Mn–O bond. Owing to these advantages, the optimal LiCr 0.01 Al 0.05 Mn 1.94 O 4 delivers a good electrochemical performance with a high first discharge capacity of 118.5 mA h g −1 and a capacity retention of 70.8% after 1000 cycles at 1 C. Even at relatively high current rates of 15 and 20 C, a durable and prolonged cycling performance of up to 3000 cycles can be achieved. In addition, a high-temperature capacity retention of 72.1% is also maintained after 200 cycles at 5 C under 55 °C. This work provides potential candidates for developing long-life Li-ion batteries with a simultaneously high capacity.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1472887-4
Bookmarklink