【摘要】 采用溶胶-凝胶法合成了Zn2+取代的锂离子电池正极材料Li1+xZnxMn2-xO4。结构研究结果表明,用这种方法可以在比固相反应低得多的温度下得到单相的尖晶石且制得的材料粒度均匀,粒径大多在150nm左右。半电池循环测试结果表明,起始组成为x=0.06的样品性能最佳,其与锂片组成的半电池在3.0V—4.6V间,以0.10mA/cm2的电流密度进行充放电的首次充、放电容量分别为131.4mAh/g和129.2mAh/g,经35次循环后容量仍保持在100mAh/g。更多还原

【Abstract】 Lithium-rich zinc doped Li1+x Znx Mn2-xO4 as cathode material of lithium ion battery has been synthesized by sol-gel method.X-ray powder diffraction analysis shows that a single spinel phase can be obtained by heating the precursor at lower temperature.TEM image reveals that the sample has perfect morphology.Charge/discharge experiments of Li/ Li1+x Znx Mn2-xO4 half cell in 1 M LiPF6 / EC+DEC+DMC(1:1:1) electrolyte between 3.0 V—4.6 V at a rate of 0.10 mA/cm2 show that the sample with initial composition of x=0.06 possesses the best performance,its initial charge and discharge capacity reaches up to 131.4 mAh/g and 129.2 mAh/g respectively,and its capacity retains 100 mAh/g after 35th cycles.更多还原