Porous Manganese Oxide Networks as High-Capacity and High-Rate Anodes for Lithium-Ion Batteries

Energies

DongHwan Kang¹  WooJin Byun¹  Jaeho Choi¹  JungKyoo Lee¹ 

[1] Department of Chemical Engineering (BK21 FOUR Graduate Program), Dong-A University, Busan 49315, Korea;

关键词: lithium-ion battery;    anodes;    manganese oxides;    mesoporous manganese oxides;   

DOI  :  10.3390/en14051299

来源: DOAJ

【 摘 要 】

A mesoporous MnO_x network (MMN) structure and MMN/C composites were prepared and evaluated as anodes for high-energy and high-rate lithium-ion batteries (LIB) in comparison to typical manganese oxide nanoparticle (MnNP) and graphite anodes, not only in a half-cell but also in a full-cell configuration (assembled with an NCM523, LiNi_0.5Co_0.2Mn_0.3O₂, cathode). With the mesoporous features of the MMN, the MMN/C exhibited a high capacity (approximately 720 mAh g⁻¹ at 100 mA g⁻¹) and an excellent cycling stability at low electrode resistance compared to the MnNP/C composite. The MMN/C composite also showed much greater rate responses than the graphite anode. Owing to the inherent high discharge (de-lithiation) voltage of the MMN/C than graphite as anodes, however, the MMN║NCM523 full cell showed approximately 87.4% of the specific energy density of the Gr║NCM523 at 0.2 C. At high current density above 0.2 C, the MMN║NCM523 cell delivered much higher energy than the Gr║NCM523 mainly due to the excellent rate capability of the MMN/C anode. Therefore, we have demonstrated that the stabilized and high-capacity MMN/C composite can be successfully employed as anodes in LIB cells for high-rate applications.

【 授权许可】

Unknown