Direct Regeneration of Spent Lithium-Ion Battery Cathodes:From Theoretical Study to Production Practice

Direct regeneration method has been widely concerned by researchers in the field of battery recycling because of its advantages of in situ regeneration,short process and less pollutant emission.In this review,we firstly analyze the primary causes for the failure of three representative battery cathodes(lithium iron phosphate,layered lithium transition metal oxide and lithium cobalt oxide),targeting at illustrating their underlying regeneration mecha-nism and applicability.Efficient stripping of material from the collector to obtain pure cathode material has become a first challenge in recycling,for which we report several pretreatment methods currently available for subsequent regeneration processes.We review and discuss emphatically the research progress of five direct regeneration methods,including solid-state sintering,hydrothermal,eutectic molten salt,electrochemical and chemical lithiation methods.Finally,the application of direct regeneration technology in production practice is introduced,the problems exposed at the early stage of the industrialization of direct regeneration technol-ogy are revealed,and the prospect of future large-scale commercial production is proposed.It is hoped that this review will give readers a comprehensive and basic understanding of direct regeneration methods for used lithium-ion batteries and promote the industrial application of direct regeneration technology.

Discussion on the Teaching Concept of Major Production Practice

College students’major production practice is an important part of practical teaching in colleges and universities,a key link of major teaching system,a necessary link of undergraduate teaching training program and teaching plan,and an important form of combining classroom education with social practice.In order to meet the actual needs of college students’major production practice,this paper proposes the key links of establishing strategic cooperation relationship with enterprises and institutions by industry university research channels,ensuring the construction of practice base,changing the ideas of teachers and students,stimulating students’internal motivation,maintaining the goal of professional characteristics,adhering to the exploration of professional characteristics,strengthening the cultivation of comprehensive ability and improving the assessment mechanism of production practice to ensure the high quality of college students’major production practice and achieve the purpose of practice.

“后生产主义”:理论、实践及其对中国的启示

后生产主义作为一个西方学界广泛讨论的议题,已成为中国“三农”问题研究的一个重要背景,探讨后生产主义的起源、演变和实践,阐明其概念内涵及当前研究状况,对中国“三农”问题具有深远的理论和实践意义。文章通过文献学研究法和CiteSpace分析,选取WebofScience中,以“后生产主义”为主题的代表性期刊进行总结分析,结果表明:1)后生产主义起源于生产主义危机,这一场覆盖农业生产、农村生态与农民生存的生产主义危机,表征为3种类型的“跑步机问题”;2)从农民角色、农业政策、农耕技术、环境影响4个方面,构建后生产主义的概念域,并提炼出概念发展的3个阶段;3)在后生产主义实践方面看,通过发达国家与发展中国家进行横向与纵向对比可知,一方面,发达国家之间后生产主义乡村实践的共性特征和区域差异是互相交织的,另一方面,不能简单用后生产主义指标去诠释发展中国家的“去农业化”现象,需关注形式相似性背后的内容差异。后生产主义对中国“三农”问题的启示是,应注重研判与把握乡村发展时机,将整体推进与重点突破相结合,应继续坚持以产业振兴为要,应深度挖掘乡村空间的多维价值,推动乡村发展和城乡融合。

Yinguizhan

Editor-in-chief(?) Prof DINa yuanshu In Chinese.