Synthesis and electrochemical performance of micro-nano structured LiFe1-xMnxPO4/C (0 ≤x ≤ 0.05) cathode for lithium-ion batteries

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（3）
• 页码范围: 923-929
• 页数: 7页
• 语种: 英文

摘要

Micro-nano structured LiFe1-xMnxPO4/C (0 ≤ x ≤ 0.05) cathodes were prepared by spray drying,followed by calcination at 700℃.The spherical LiFe1-xMnxPO4/C (0≤ x≤0.05) particles with the size of 0.5 to 5.0μm are composed of lots of nanoparticles of 20 to 30nm,and have the well-developed interconnected pore structure.In contrast,when Mn doping content is 3 mol％ (x=0,03),the LiFe0.97Mn0.03PO4/Cdemonstrates maximum specific surface area of 31.30m2/g,more uniform pore size and relatively better electrochemical performance.The initial discharge capacities are 161.59,157.04 and 153.13 mAh/g at a discharge rate of 0.2,0.5 and 1 C,respectively.Meanwhile,the discharge capacity retentions are ～100％ after 120 cycles.The improved electrochemical performance should be attributed to higher specific surface,smaller polarization voltage,and a high Li+ diffusion rate due to the micro-nano porous structure and lattice expansion produced by Mn doping.