材料科学
阴极
聚酰亚胺
复合材料
化学工程
韧性
电解质
开裂
电极
化学
图层(电子)
工程类
物理化学
作者
Guojun Zha,Chuying Ouyang,Shungao Yin,Kaiqing Yao,Saurabh Agarwal,Naigen Hu,Haoqing Hou
出处
期刊:Small
[Wiley]
日期:2021-09-29
卷期号:17 (47)
被引量:22
标识
DOI:10.1002/smll.202102981
摘要
Abstract The Ni‐rich LiNi 0.8 Co 0.10 Mn 0.1 O 2 (NCM811) cathode coated by combining with multi‐walled carbon nanotubes (MWCNTs) and polyimide (PI) produces a PI3‐NCM811 cathode, which markedly improves cycling stability and suppresses secondary crystal cracking. The initial discharge capacity of the PI3‐NCM811 cathode is 199.6 mAh g −1 between 2.8 and 4.3 V at 0.1 C @ 25 °C, which is slightly lower than that of NCM811 (201.1 mAh g −1 ). The PI3‐NCM811 and NCM811 cathodes keep 90.6% and 64.8% of their initial discharge capacity at 1 C between 2.8 and 4.3 V after 500 cycles, respectively. Furthermore, the difference (21.1%) in capacity retention rate between PI3‐NCM811 and NCM811 under the condition of 2.8–4.5 V became smaller compared with the difference (25.8%) under the condition of 2.8–4.3 V. This better cyclic stability is mainly attributed to the toughness and elasticity of PI, which inhibits the secondary cracking, maintains the structural integrity of the cathode particles, and protects the particles from electrolyte damage during long‐term cycling.
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