期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 4, 页码 3832-3841出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00235
关键词
battery thermal management; phase change material; reliability; rationally designed polymer skeleton; thermal conductivity; latent heat
资金
- National Natural Science Foundation of China (NNSFC) [21875046]
- Natural Science Foundation of Guangdong Province [2019A1515011525]
In this study, a leakage-proof composite phase change material (CPCM) was developed by growing a phase changeable and hydrophobic polymer skeleton in a paraffin/expanded graphite matrix. The CPCM showed high latent heat and thermal conductivity, as well as excellent shape stability and anti-leakage performance under high temperatures. This CPCM exhibited durable cooling performance for a battery module under harsh working conditions, maintaining constant maximum temperature and temperature difference during cycles.
The development of phase change material (PCM) for battery thermal management poses key limitations on its reliability caused by leakage and shape deformation under high temperature. In this work, a kind of phase changeable and hydrophobic polymer skeleton is grown in situ in a paraffin (PA)/expanded graphite matrix to obtain the leakage-proof composite PCM (CPCM) at the kilogram-level. Benefiting from the additional latent heat provided by the phase changeable alkyl side chains of the polymer skeleton, the obtained CPCM shows a high latent heat of 120.3 J g(-1) coupled with a thermal conductivity of 2.92 W K-1. Most importantly, the three-dimensional cross-linking main chain and the hydrophobic alkyl side chains endow the obtained CPCM with extraordinary shape stability under high temperatures up to 250 degrees C and high PA adsorbing capability, respectively. As a consequence, the CPCM presents excellent antileakage performance for the battery module (21 V/16 Ah) under harsh working conditions, i.e., 50 charge-discharge cycles at 3C-4C, thus giving rise to a durable cooling performance. The maximum temperature (T-max) and temperature difference (Delta T-max) of the battery module can be controlled constant at 50.9 and 5.0 degrees C during the cycles, respectively. By stark contrast, owing to the obvious leakage phenomenon, the battery module with traditional CPCM adopting a classical low-density polyethylene skeleton shows increasing T-max and Delta T-max during the cycles.
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