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- Title
High Performance LiMn<sub>1.9</sub>Al<sub>0.1</sub>O<sub>4</sub> Porous Microspheres Rapidly Self‐Assembled through an Acetylene‐Black‐Assisted Solid‐State Approach.
- Authors
Tan, Xinghua; Guo, Limin; Jiang, Yi; Liu, Shengnan; Zhang, Jiangtao; Wu, Jianxin; Kang, Xiaohong; Wang, Hanfu; Chu, Weiguo
- Abstract
We present a novel approach for preparing porous LiMn1.9Al0.1O4 microspheres with diameters of about 2 μm through direct calcination of solid monolith‐like precursors formed by simply mixing acetylene black and nitrate. The introduction of aluminium not only causes lattice doping of manganese but also plays an indispensable role in the formation of the porous microsphere structure assisted by acetylene black as both a solution absorbent and a pore‐forming agent. Porous LiMn1.9Al0.1O4 microspheres with an optimized aluminium concentration demonstrate a superior rate capability of 121 mAh g−1 at 1 C and 94 mAh g−1 at 40 C, and an excellent cyclic performance with a capacity retention of 82 % at 1 C after 700 cycles. The excellent electrochemical performance results from the unique porous microspheres assembled by nanoparticles and the doping of Al. The approach proposed herein is facile, inexpensive, and environmentally friendly and could also be extended to the mass production of other electrode materials. Mighty microspheres: A method for preparing porous LiMn1.9Al0.1O4 microspheres with diameters of about 2 μm is presented. The approach is based on direct calcination of solid monolith‐like precursors formed by simply mixing acetylene black and nitrate. An optimum Al concentration leads to rate capabilities of 121 mAh g−1 at 1 C and 94 mAh g−1 at 40 C, and an excellent cyclic performance with a capacity retention of 82 % at 1 C after 700 cycles.
- Subjects
MICROSPHERES; ALUMINUM; ACETYLENE; ELECTROCHEMICAL analysis; NANOPARTICLES
- Publication
ChemElectroChem, 2019, Vol 6, Issue 3, p668
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201801609