Digital Twin Enables Rational Design of Ultrahigh‐Power Lithium‐Ion Batteries

Abstract

With the widespread applications of electric vehicles, power grid stabilization, and high‐pulsed power loads, high‐power lithium‐ion batteries (LIBs) are in urgent demand. However, the existing experimental‐based design of high‐power batteries is usually costly and inefficient, and provides limited information on the complex physicochemical processes inside the batteries. Digital twin concept is promising for capturing the batteries’ electrochemical performance, and optimizing the power capability of LIBs. Here, an electrochemical‐thermal coupled model is developed as a digital twin model for rational design of ultrahigh‐power LiFePO4/graphite LIBs. The model can accurately predict the batteries’ performance and help to predetermine the optimal parameters to achieve an ultrahigh power capability. After model‐guided optimization, the battery shows a high energy density of 92.38 Wh kg−1 at an ultrafast discharging current of 50 C and can withstand 150 C pulse discharging tests. Notably, the digital twin model can reveal experimentally inaccessible time‐ and space‐resolved information and identify the rate‐determining steps inside the battery. Hence, model‐driven optimization of ultrahigh‐power LiFePO4/graphite batteries is successfully realized aiming at the critical factors in the rate‐determining steps. The work provides an instructive design of ultrahigh‐power LiFePO4/graphite batteries, which might guide the future direction to boost the power capability of LIBs.

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Double‐Salts Super Concentrated Carbonate Electrolyte Boosting Electrochemical Performance of Ni‐Rich LiNi0.90Co0.05Mn0.05O2 Lithium Metal Batteries

“…Lithium-ion batteries (LIBs) have been widely applied to energy storage system, intelligent devices, and electric vehicles owing to the advantage of long-term life and environmental friendliness. [1,2] However, lithium-ion batteries with typical LiFePO 4 cathode and graphite anode have approached the upper limit of energy density of 300 Wh kg −1 , [3,4] which limits the DOI: 10.1002/smll.202311650 higher requirement for high energy density battery. More high specific capacity cathode and anode materials, as well as the batteries chemistries should be studied comprehensively to enhance the energy density of Li secondary batteries.…”