摘要
The rate performance of lithium manganese phosphate is seriously tarnished by its sluggish surface kinetics,which could be addressed by LiFePO4-surface coating.For a higher energy output,here we explore thinner coating layers with 10%and 5%LiFePO4 via the lab-developed DMSO assisted method.The core-shell structured 0.9LiMnPO4-0.1LiFePO4/C maintains a high specific capacity,153,148 and 140 mA hg-1 under 0.1,1 and 5 C respectively,which are the best results for this composition till date.As for 0.95Li MnPO4-0.05 LiFePO4/C,the discharge capacity is lower than 110 mA hg-1 even in 0.1 C,which cannot meet the requirements of practical application.Our approaches push the manganese ratio of LiMnPO4-based composite to 90%from 80%,further improving the energy-density of the olivine phosphates.
基金
supported by the National Natural Science Foundation of China(Grant No.51572273)
the National Key R&D Program of China(Grant No.2018YFB0905400)
the Ningbo S&T Innovation 2025 Major Special Programme(Grant No.2018B10061)。
