Synthesis of spinel LiNi0.5Mn1.5O4 cathode material with excellent cycle stability using urea-based sol–gel method

Preparing LiNi0.5Mn1.5O4 nanoplates with superior properties in lithium-ion batteries using bimetal–organic coordination-polymers as precursors

“…Activated upon cycling, the "+15%" sample can deliver 124.6 and 117.7 mA h g À1 at 1 C and 10 C, with capacity retentions of 82.4% and 74.0% for the 1000 th cycle, respectively. The cycling properties of the LiNi 0.5 Mn 1.5 O 4 materials in this work compare favorably with the values previously reported, 24,30,59,60 in which the capacity retention was about 80% of the initial capacity aer 500 cycles at a 10 C rate, 59 or they retained less than 90% of the initial capacity aer only 200 cycles at a 20 C rate. 24,30 Besides, few literatures have reported long-term cycling properties extending over 500 cycles.…”

“…The LiNi 0.5 Mn 1.5 O 4 cathode material prepared using a urea-based sol-gel method delivered a specic discharge capacity of 97.8 mA h g À1 and retained 87.5% of the initial capacity aer 200 cycles at a 20 C rate. 30 LiNi 0.5 Mn 1.5 O 4 with a hierarchical porous structure prepared using a cotton-template method retained more than 92% of the initial capacity aer 400 cycles of charging-discharging at a 5 C rate. 31 Similar cycling stability at high discharge rates was also exhibited by LiNi 0.5 Mn 1.5 O 4 porous nanorods prepared from 1D porous Mn 2 O 3 .…”

Urea-based hydrothermal synthesis of LiNi0.5Co0.2Mn0.3O2 cathode material for Li-ion battery

“…Urea had been used as fuel and chelating agent in the synthesis of doped LiCoO 2 [25], LiNi 0.5 Mn 1.5 O 4 spinel [26][27][28], lithium-rich cathode materials [29], and CoNiAl three-component layered double hydroxides [30]. The decomposition of urea releases CO 3 2− slowly at elevated temperature, and the following reaction can happen [31], which allows the precursor to precipitate:…”

Synthesis of Well‐Crystallized, High‐Performance LiNi0.5Mn1.5O4 Octahedra as Lithium‐Ion‐Battery Electrode Promoted by Metal Manganese Powders

“…The capacity retention of M‐LNMO after 600 cycles was 90 %, whereas only 56 % was achieved for MA‐LNMO, indicative of a far better cycle stability for M‐LNMO. The different changing trends for the cycle performance in the first 10 cycles between the M‐LNMO‐ and MA‐LNMO‐based cells may be because of the gradual availability of electrolyte to some particles and the gradual formation of SEI films for M‐LNMO; however, for MA‐LNMO, the SEI films form relatively quickly because of its exposed non‐close‐packed {1 1 1} facets . It is known that M‐LNMO has shorter Mn−O bonds, which could stabilize the crystal structure upon charge/discharge.…”