Microwave-assisted pyrolysis of biomass and electrode materials from spent lithium-ion batteries: Characteristics and product compositions

IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Industrial Crops and Products Pub Date : 2024-10-29 DOI:10.1016/j.indcrop.2024.119899
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Abstract

The development of new energy has promoted the wide application of electric vehicles, but it has also led to a large number of spent lithium-ion batteries (LIBs). Microwave-assisted pyrolysis (MAP) of electrode materials from spent LIBs and biomass has been proven to be an effective method for recovering valuable metals. However, the microwave absorption of these electrode materials, the pyrolysis characteristics of biomass, and their product compositions have not been clearly identified. Herein, the feasibility of several electrode materials from spent LIBs (graphite, LiFePO4, and oxide cathodes) as microwave absorbers in MAP was evaluated by vector net analysis. Furthermore, the MAP characteristics of biomass (cellulose, hemicellulose, lignin, and peanut shell) and these electrode materials were investigated, and relevant mechanisms were proposed through product analysis. The results showed that all electrode materials exhibited medium or strong microwave absorption (tanδε > 0.02) at 2.45 GHz, indicating that they are suitable microwave absorbers for MAP. These spent electrode materials significantly increased the mass loss and yield of gaseous products in the MAP of the above biomass, promoting H2 production and CH4 decomposition. The oxide cathodes could facilitate the dehydration and aromatization of cellulose and hemicellulose, while LiFePO4 and graphite might increase the aromatic content in the liquid products due to their strong reducibility for biomass deoxygenation. Moreover, the characterizations of solid products revealed the phase transitions of spent electrode materials before and after MAP with biomass. This study could provide an experimental and theoretical basis for the application of spent electrode materials from lithium-ion batteries in the microwave-assisted pyrolysis of biomass.
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微波辅助热解废锂离子电池中的生物质和电极材料:特性和产品成分
新能源的发展促进了电动汽车的广泛应用,但同时也产生了大量废旧锂离子电池(LIB)。对废锂离子电池和生物质中的电极材料进行微波辅助热解(MAP)已被证明是一种回收有价金属的有效方法。然而,这些电极材料的微波吸收、生物质的热解特性及其产品成分尚未得到明确的鉴定。在此,通过矢量网分析评估了废 LIB 的几种电极材料(石墨、磷酸铁锂和氧化物阴极)在 MAP 中作为微波吸收剂的可行性。此外,还研究了生物质(纤维素、半纤维素、木质素和花生壳)和这些电极材料的 MAP 特性,并通过产物分析提出了相关机制。结果表明,所有电极材料在 2.45 GHz 下都表现出中等或较强的微波吸收(tanδε > 0.02),表明它们是适用于 MAP 的微波吸收体。这些废电极材料大大增加了上述生物质 MAP 的质量损失和气态产物的产量,促进了 H2 的产生和 CH4 的分解。氧化物阴极可促进纤维素和半纤维素的脱水和芳香化,而磷酸铁锂和石墨由于对生物质脱氧具有很强的还原性,可能会增加液态产物中的芳香含量。此外,固体产物的表征揭示了废电极材料在与生物质进行 MAP 反应前后的相变。这项研究为锂离子电池废电极材料在微波辅助生物质热解中的应用提供了实验和理论依据。
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来源期刊
Industrial Crops and Products
Industrial Crops and Products 农林科学-农业工程
CiteScore
9.50
自引率
8.50%
发文量
1518
审稿时长
43 days
期刊介绍: Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.
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