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OALib Journal期刊
ISSN: 2333-9721
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lifepo4锂电池正极材料的共碳包覆和mn掺杂的改性
DOI: doi:10.3969/j.issn.1671-7627.2012.06.001, PP. 1-6
Keywords: 锂电池,lifepo4,mn掺杂,碳包覆
Abstract:
采用高能球磨辅助固相法制备碳包覆并掺杂mn的lifepo4正极材料life1-xmnxpo4(x=0.04、0.05、0.06和0.07)。通过x线衍射光谱仪(xrd)、场发射扫描电子显微镜(fesem)、比表面积(bet)及恒流充放电等测试手段考察mn的掺杂量及碳的包覆量对lifepo4的结构、形貌及电化学性能的影响,最终确定优化条件。结果表明:mn掺杂量x=0.06及碳的前驱体(蔗糖)添加量为life0.94mn0.06po4质量的2.5%(碳最终质量分数为1.26%)时,所获得的碳包覆和mn掺杂的lifepo4正极材料的电化学性能最优异,其0.1c倍率的放电比容量为165.1ma·h/g,10c倍率的放电比容量仍达92.4ma·h/g,50次循环后容量保持率分别为96.7%及89.2%。
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