Cathodic performance of LiMn1−xMxPO4 (M = Ti, Mg and Zr) annealed in an inert atmosphere
Cathodic performance of LiMn1−xMxPO4 (M = Ti, Mg and Zr) annealed in an inert atmosphere
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DOI：
10.1016/j.electacta.2008.11.069
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发表时间：
2009-04
影响因子：
6.6
通讯作者：
Tomoyuki Shiratsuchi;S. Okada;T. Doi;J. Yamaki
中科院分区：
文献类型：
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作者：
Tomoyuki Shiratsuchi;S. Okada;T. Doi;J. Yamaki
为了提高橄榄石型LiMnPO 4的阴极性能，研究了碳与阳离子掺杂复合材料的最佳退火条件。采用行星式球磨机在水溶液中合成了纳米晶和阳离子掺杂的LiMn 1 − xMxPO 4（M=Ti，Mg，Zr，x=0，0.01，0.05和0.10）。合成在350°C的相当低的温度下进行以限制粒度。除Zr掺杂的样品外，所获得的样品由均匀的纳米尺寸的颗粒组成。在500 ~ 550°C的温度范围内，在惰性气氛中，用碳对LiMnPO 4进行退火处理，可以大大提高LiMnPO 4的性能。在900°C退火的样品中检测到少量的富金属磷化物（Mn 2 P）。此外，1at.% Mg掺杂Fe增强了我们掺杂样品的速率性能。LiMn0.99Mg0.01PO4/C在0.1mA/cm 2下的放电容量为146 mAh/g，在2.0mA/cm 2下的放电容量为125 mAh/g。
To improve the cathodic performance of olivine-type LiMnPO4, we investigated the optimal annealing conditions for a composite of carbon with cation doping. Nanocrystalline and the cation-doped LiMn1−xMxPO4(M=Ti, Mg, Zr and x=0, 0.01, 0.05 and 0.10) was synthesized in aqueous solution using a planetary ball mill. The synthesis was performed at the fairly low temperature of 350°C to limit particle size. The obtained samples except for the Zr doped one consisted of uniform and nano-sized particles. The performance of LiMnPO4was much improved by an annealing treatment between 500 and 550°C with carbon in an inert atmosphere. A small amount of metal-rich phosphide (Mn2P) was detected in the sample annealed at 900°C. In addition, 1at.% Mg doping for Fe enhanced the rate capability in our doped samples. The discharge capacity of LiMn0.99Mg0.01PO4/C was 146mAh/g at 0.1mA/cm2and 125mAh/g even at 2.0mA/cm2.