重量分析
氟化物
炭黑
锂(药物)
材料科学
阴极
电池(电)
功率密度
碳纤维
化学工程
能量密度
电流密度
功率(物理)
化学
复合材料
无机化学
工程物理
有机化学
热力学
复合数
物理化学
物理
天然橡胶
医学
量子力学
内分泌学
工程类
作者
Chang Wang,Jiu Kang Teng,Xiao Tao Chen,Jun Hua Wei,Bin Shi,Zhulin Yuan,Xin Lu Li,Seunggu Kang,Kang Kang Tang
标识
DOI:10.1002/ente.202300635
摘要
Ketjen black fluoride (KBF‐2) material, a novel carbon fluoride cathode nanomaterial, is fabricated through a pregrinding treatment followed by a fluorination process for lithium primary batteries. The ketjen black material as the carbon precursors provides a 3D spherical structure with a high‐specific surface area. In addition, the pregrinding treatment results in several cracks in the spherical KBF‐2 particles. The effects of cracks on the fluorine content ratio under the same fluorination process conditions, diffusion coefficient of lithium ions, rate performance, and power density performance are investigated. At an extremely high current density of 4.5 A g −1 (at a 6 C rate), the discharge capacity retention is 52.09%, which is a breakthrough for the series of fluoride cathode materials. Moreover, the KBF‐2 cathode is evaluated in a 10 Ah KBF‐2/Li primary pouch cell and demonstrated a high gravimetric energy density of 573.70 Wh kg −1 at a 0.5 C rate, and the discharge duration time reached 624 s under a constant specific power of 1,500 W kg −1 . These factors contribute to the remarkable energy density performance and power output stability, particularly at high current densities.
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