一种水下航行器用高安全高比能锂离子电池研究OA

For the working environment of underwater vehicles,a lithium-ion battery solution that balances safety and specific energy was proposed.Taking lithium manganese iron phosphate(LiFe0.3Mn0.7PO4,LFMP)with a Mn/Fe ratio of 7∶3 as the main component,ternary materials were in-troduced for composite regulation,and four cathode systems A,B,C,and D are constructed.A full set of safety verification procedures was established,including cycling,low-temperature perfor-mance,high-temperature storage,high-temperature performance,overcharge,external short circuit and needle puncture tests.The results show that as the proportion of ternary material increases,the rate capability and low-temperature performance of the battery gradually improve,but the safety de-creases.The C formulation has the best comprehensive performance.The 60 Ah cylindrical cell based on the C formulation meets the energy requirements at-5～50℃(≥182.6 Wh after high-temperature storage,≥193 Wh at room temperature/low temperature),and no fire/explosion occurred in over-charge,room temperature and high temperature short circuit,and needle puncture tests,meeting the safe application requirements of batteries for underwater vehicles.