Multi-objective optimization of lithium-ion battery designs considering the dilemma between energy density and rate capability  

作　　者：Xiao-Ying Ma Wen-Ke Zhang Ying Yin Kailong Liu Xiao-Guang Yang 

机构地区：[1]National Engineering Research Center of Electric Vehicles,School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China [2]Shenzhen Automotive Research Institute,Beijing Institute of Technology,Shenzhen,518118,Guangdong,China [3]School of Control Science and Engineering,Shandong University,Jinan,250100,China

出　　处：《Energy and AI》2024年第4期53-63,共11页能源与人工智能(英文)

基　　金：Financial support from the National Key R&D Program of China(No.2022YFB3305400);the Science and Technology Program of Guang Dong Province(No.2022A0505050019);the National Natural Science Foundation of China(No.52277212)are greatly acknowledged。

摘　　要：Electrified transportation requires batteries with high energy density and high-rate capability for both charging and discharging.Li-ion batteries(LiBs)face a dilemma:increasing areal capacity and reducing electrode porosity to boost energy density often reduces rate capability due to a longer and more tortuous ion transfer path.Tailoring cell design parameters to balance these metrics is essential but challenging.Here,we present a multi-objective optimization framework targeting energy density,fast charging,high-rate discharging,and lifespan simultaneously.Four cell parameters-cathode areal capacity,N-P ratio,cathode porosity,and anode poros-ity-along with operating temperature,are selected as design variables.A physics-based pseudo-2D model,validated against experimental data,generates data to train the surrogate model,which is combined with the NSGA-Ⅱalgorithm for rapid optimization.Three different objective calculation methods are compared to identify the maximum sum of energy densities,lowest polarization,and most balanced performance,respectively.Cell design parameters are optimized at different temperatures using the most balanced optimization method.Results demonstrate that elevating cell operating temperature achieves high-rate capability while maintaining high energy density,mitigating the energy-power trade-off and broadening battery design parameter ranges.

关 键 词：Lithium-ion batteries Multi-objective optimization Battery design Fast charging Lithium plating 

分 类 号：TM9[电气工程—电力电子与电力传动]