• Electrolyte chemical regulation of amorphous red phosphorus potassium storage performance!

    In the face of the demand for large-scale energy storage, the research of potassium ion batteries has attracted more and more attention due to the potential closer to that of lithium (-2.93 V vs. -3.04 V, she) and rich resource reserves. According to the statistics and analysis of the electrochemical performance of the anode materials for potassium ion batteries, it is found that the alloy type anode materials based on the alloy dealloying energy storage mechanism, such as antimony, bismuth, phosphorus, etc., usually have high specific capacity. However, this kind of electrode materials experienced large volume changes in the process of potassium storage, and the specific capacity decayed rapidly. In addition, metal K has more active chemical properties than Li and Na, and potential dendrite growth will cause electrolyte decomposition and SEI film rebuilding. Therefore, alleviating the large volume expansion of alloy anode and realizing the passivation of k metal are important challenges to improve the potassium storage performance and cycle life of alloy anode materials. Considering that electrolyte can passivate active metal K on the one hand, and regulate the composition and structure of SEI film on the other hand, regulating the composition of electrolyte is expected to achieve the simultaneous stability of metal K and alloy negative electrode to improve the potassium storage performance of alloy negative electrode.

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