Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China.
Nano Lett. 2012 Nov 14;12(11):5632-6. doi: 10.1021/nl3027839. Epub 2012 Oct 19.
We report the crystal orientation tuning of LiFePO(4) nanoplates for high rate lithium battery cathode materials. Olivine LiFePO(4) nanoplates can be easily prepared by glycol-based solvothermal process, and the largest crystallographic facet of the LiFePO(4) nanoplates, as well as so-caused electrochemical performances, can be tuned by the mixing procedure of starting materials. LiFePO(4) nanoplates with crystal orientation along the ac facet and bc facet present similar reversible capacities of around 160 mAh g(-1) at 0.1, 0.5, and 1 C-rates but quite different ones at high C-rates. The former delivers 156 mAh g(-1) and 148 mAh g(-1) at 5 C-rate and 10 C-rate, respectively, while the latter delivers 132 mAh g(-1) and only 28 mAh g(-1) at 5 C-rate and 10 C-rate, respectively, demonstrating that the crystal orientation plays important role for the performance of LiFePO(4) nanoplates. This paves a facile way to prepare high performance LiFePO(4) nanoplate cathode material for lithium ion batteries.
我们报告了 LiFePO4纳米板的晶体取向调谐，以用于高性能锂电池正极材料。基于乙二醇的溶剂热法可轻松制备橄榄石 LiFePO4纳米板，通过起始材料的混合过程可以调整 LiFePO4纳米板的最大晶面以及由此产生的电化学性能。沿 ac 面和 bc 面取向的 LiFePO4纳米板在 0.1、0.5 和 1 C 倍率下具有相似的可逆容量，约为 160 mAh g-1，但在高倍率下则有很大差异。前者在 5 C 率和 10 C 率下分别提供 156 mAh g-1和 148 mAh g-1，而后者在 5 C 率和 10 C 率下分别仅提供 132 mAh g-1和 28 mAh g-1，表明晶体取向对 LiFePO4纳米板的性能起着重要作用。这为制备高性能锂离子电池 LiFePO4纳米板正极材料开辟了一条简便的途径。
