The Effect of ZnO Coating on Electrochemical Cycling Behavior of Spinel LiMn[sub 2]O[sub 4] Cathode Materials at Elevated Temperature

Abstract

The structural stability of nanosized ZnO-coated LiMn2O4 was characterized by its cycling behavior at 30 and 55°C. The structural degradation and Mn dissolution of the as-prepared and ZnO-coated LiMn2O4 electrodes before and after cycling were studied. The ZnO-coating significantly improved cycling performance at 55°C. The reason for the excellent cycling performance of ZnO-coated LiMn2O4 electrode is largely attributed to ZnO’s role of HF collection from the electrolyte. © 2003 The Electrochemical Society. All rights reserved.

Enhanced low voltage cycling stability of LiMn2O4 cathode by ZnO coating for lithium ion batteries

“…1, the LA powders after aging lost their edges and corners, and became smaller after high temperature aging in the electrolyte, while the morphology of LA/ZnO powders remains nearly unchanged. The results indicate that the presence of ZnO can prevent LiMn 2 O 4 from the attack of acidic electrolyte, and thus inhibit the dissolution of manganese during cycling, as also reported by Sun [15]. Fig.…”

“…The dissolved Mn ions are reduced and deposited on the lithiated graphite anodes during cycling, causing capacity loss of the graphite. To improve the cycling performance and reduce the Mn dissolution, oxide coatings by sol-gel method were used to improve high-temperature behaviors of the spinel LiMn 2 O 4 [12][13][14][15].…”

Reversible and High‐Capacity Nanostructured Electrode Materials for Li‐Ion Batteries

“…[112] On the other hand, MgO, SnO 2 , Al 2 O 3 , ZnO, ZrO 2 , and TiO 2 coatings on layered LiCoO 2 and LiNi 1Àx M x O 2 via the sol-gel method have been intensively investigated. [112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127] Among these coating materials, ZrO 2 coating exhibits the best capacity retention at >4.5 V cycling and hightemperature storage at 90 8C. [128] This finding can be supported with the ZrO 2 coating on spinel LiMn 2 O 4 , which shows the lowest capacity fading at 55 8C cycling among the various coating materials.…”

“…[128] This finding can be supported with the ZrO 2 coating on spinel LiMn 2 O 4 , which shows the lowest capacity fading at 55 8C cycling among the various coating materials. [126] The improvement is due to the fact that ZrO 2 behaves as an effective HF scavenger.…”

Synthesis and characterization of LiCo x Mn2−x O4 cathode materials

“…By comparison with other two materials, LiMn 2 O 4 has received much attention due to its merits of low cost, environmental protection, easy preparation and thermal stability at high temperature, therefore, it is considered as one of the most promising candidates for positive electrode in lithium ion batteries [2][3][4] .…”