期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 5, 页码 4271-4276出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00160
关键词
Li3PO4 coating; cathode materials; lithium ion batteries; X-ray diffraction; electrochemistry
资金
- Helmholtz Energy Materials Foundry (HEMF)
The use of H2O2 activated the surface of LNMO, facilitating the uniform deposition of Li, Al, Ti, and phosphate ions, leading to improved cycling performance and Coulombic efficiency of the battery cathode material.
Using hydrogen peroxide (H2O2), a novel approach was applied for the synthesis of LiNi0.5Mn1.5O4 (LNMO) coated with Li3PO4 and doped with Al3+ and Ti4+ ions. The reaction between LNMO and H2O2 resulted in particles with a partially damaged surface. If the same reaction is done in the presence of lithium, aluminum, titanium, and phosphate ingredients, then all particle facets are intact and show no sign of destruction. It appears that the H2O2 decomposition activates the LNMO surface, generating perfect conditions for the homogeneous deposition of the Li, Al, Ti, and phosphate ions. Electrochemical investigations show a very slow fading process during the cycling, and even after more than 500 cycles, the obtained cathode material shows a high specific capacity of 127 mAh g(-1) (at 1 C) (similar to 98% capacity retention) and an excellent Coulombic efficiency (99.5%).
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