Surficial Oxidation of Phosphorus for Strengthening Interface Interaction and Enhancing Lithium-Storage Performance

• DOI: 10.1021/acs.nanolett.2c03038
• Publication Date: 2022-11-15T21:57:33Z
• Authors: Xu Liang; Xu Li; Qianxin Xiang; Shaojie Zhang; Yu Cao; Muyao Han; Yiming Zhang; Chaoyi Zhou; Yunhua Xu; Chong Mao; Weiyang Li; Jie Sun
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

By virtue of high theoretical capacity and appropriate lithiation potential, phosphorus is considered as a prospective next-generation anode material for lithium-ion batteries. However, there are some problems hampering its practical application, such as low ionic conductivity and serious volume expansion. Herein, we demonstrated an in situ preoxidation strategy to build a oxidation function layer at phosphorus particle. The oxide layer not only acted as a protective layer to prolong the storage time of phosphorus anode in air but also carbonized N-methyl pyrrolidone and poly (vinylidene fluoride), strengthening the interfacial interaction between phosphorus particles and binder. The oxide layer further induced the formation of a stable solid electrolyte interface with high lithium-ion conductivity. The oxidized P-CNT maintained high specific capacity of 1306 mAh g-1 and 89% capacity after 100 cycles, much higher than that of pristine P-CNT (17.1%). The strategy of in situ oxidation is facile and conducive to the practical application of phosphorus-based anodes.