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A CO2-Mediated Li-O2 Battery With 3.3 V Discharge Voltage
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DOI：10.1002/anie.4071427.png)
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Abstract
En 中文
Lithium-oxygen (Li-O2) batteries overcome the ion-intercalation chemistry in lithium-ion batteries by employing oxygen conversion reactions beyond the solid cathode framework. However, sluggish kinetic limit practical discharge voltages below 2.85 V, establishing a “high capacity, low power output” dilemma that severely compromises achievable energy and power densities. Herein, a CO2-mediated Li-O2 battery (CLOB) is constructed to redefine the oxygen redox chemistry by strategically optimizing gas composition and catalytic architecture, successfully elevating the discharge voltage to 3.30 V comparable to the LiFePO4-based lithium-ion batteries. O2 and CO2 are gradually reduced to form the intermediates of Li2CO4 and Li2C2O6, and finally Li2CO3 as the discharge product. It leads to an equilibrium voltage of 3.30 V in a two-electrode electrochemical cell. Furthermore, iron phthalocyanine (FePc) is introduced as a soluble molecular carrier to mitigate the kinetic constraint. The demonstrated FePc-based CLOB delivers an exceptional discharge voltage of 3.30 V and the assembled pouch cell exhibits a 1.38 Ah capacity with an ultrahigh energy density of 870.1 Wh kg−1. This voltage enhancement substantially improves energy output and offers a new paradigm for the commercialization of metal-gas batteries.
Keywords:
electrochemical O2 reduction
high out-put potential
Li-O2 battery
molecular carries
reaction pathway
Journal
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16.9
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5.6W
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53.0W