1. A Micro-Cracked Conductive Layer Made of Multiwalled Carbon Nanotubes for Lithium-Ion Batteries
- Author
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Wei Yuan, Tan Zhenhao, Luo Jian, Qiu Zhiqiang, Yong Tang, and Yu Chen
- Subjects
Materials science ,02 engineering and technology ,Carbon nanotube ,engineering.material ,Current collector ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Cathode ,Lithium-ion battery ,0104 chemical sciences ,Anode ,law.invention ,General Energy ,Coating ,law ,engineering ,Particle size ,Composite material ,0210 nano-technology ,Layer (electronics) - Abstract
A conductive layer, made of multi-walled carbon nanotubes (MWCNTs), with micro-cracks and a micro/nano porous structure was fabricated between the active material layer (AML) and the current collector in this study. The coating thickness of MWCNTs-based conductive layer (MCL) varies in the range of 25-100 μm. The electrochemical tests of half-cells demonstrate that both the mesocarbon-microbeads (MCMB) anode and the LiCoO2 cathode with a micro-cracked MCL show higher capacity, lower impedance and less capacity fading. These improvements are closely due to the enhancement of adhesion strength, and also the outstanding buffer effect of the micro-cracked MCL. With the change of the coating thickness, the size and amount of the micro-cracks on the MCL varies accordingly to accommodate the active material with different particle sizes. The electrodes including a micro-cracked MCL with a coating thickness of 50 and 75 μm are more suitable for MCMB and LiCoO2 with a particle size of 10-20 μm.
- Published
- 2018