阴极
硼
锂(药物)
材料科学
兴奋剂
碳纤维
离子
图层(电子)
电化学
无机化学
纳米技术
光电子学
电极
化学
物理化学
复合材料
复合数
有机化学
内分泌学
医学
作者
Chen Yong-guang,Hualing Tian,Yanfei Cai,Yingbo Wang,Xiang Yao,Zhi Su
标识
DOI:10.1002/ente.202301537
摘要
Polyanionic cathode materials are increasingly used in research because of their good cycling performance, high theoretical capacity, and high operating voltage. However, it exhibits poor performance due to its structure, which prevents it from reaching its full theoretical capacity. In this study, carbon‐coated Li 6 V 3 (PO 4 ) 5 @C cathode materials are constructed under Li 3 V 2 (PO 4 ) 3 research conditions using the sol–gel process and anhydrous citric acid as the carbon source. Several boron doping concentrations are investigated to create Li 6 V 3 (PO 4 ) 5 @BC cathode materials. The electrochemical measurements demonstrate that during the first cycle, at a current density of 0.5 C and a B doping quantity of 2 wt%, the specific discharge capacity of Li 6 V 3 (PO 4 ) 5 @BC reaches 167.43 mAh g −1 . The steady discharge specific capacity following 80 cycles of constant‐current charging and discharging is 136.84 mAh g −1 . Li 6 V 3 (PO 4 ) 5 @BC‐2 has a specific discharge capacity of 131.1 mAh g −1 at 2 C. The material's electrochemical performance greatly improves following the right quantity of B doping, which is primarily attributed to the increase in carbon layer defects brought on by B's entrance. This can increase the rate of lithium‐ion migration and hold more lithium ions.
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