Article(id=1319726499599598038, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20250500, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1750608000000, receivedDateStr=2025-06-23, revisedDate=1754582400000, revisedDateStr=2025-08-08, acceptedDate=null, acceptedDateStr=null, onlineDate=1792576916836, onlineDateStr=2026-10-21, pubDate=1766160000000, pubDateStr=2025-12-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792576916836, onlineIssueDateStr=2026-10-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792576916836, creator=13701087609, updateTime=1792576916836, updator=13701087609, issue=Issue{id=1319726426404803327, tenantId=1146029695717560320, journalId=1263187385517883426, year='2025', volume='53', issue='12', pageStart='3433', pageEnd='3832', issueExtLink='null', onlineDate='null', pubDate='1766160000000', pubDateStr='2025-12-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792576899386, creator='13701087609', updateTime=1792577516933, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319729016953749818, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319729016953749819, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=3600, endPage=3610, ext={EN=ArticleExt(id=1319726502040682971, articleId=1319726499599598038, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Magnetic Separation and Regeneration of Used Lithium Iron Phosphate and Graphite, columnId=1321944801822487508, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Clean and Efficient Utilization of Non-Metallic Minerals—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction Lithium-ion batteries (LIBs) are widely applied in electric vehicles and portable electronics due to their high energy density and environmentally friendly characteristics. However, large numbers of LIBs would be retired in the future because of their limited lifespan (5-8 a). Used batteries contain numerous organic materials and valuable elements. They cause serious pollution and resource waste in the absence of suitable treatment. Therefore, typical pre-treatments are carried out to obtain used cathode or anode materials. A series of recycling methods are explored to utilize spent electrode materials, such as element-extracting leaching and direct regeneration. Compared to element-extracting leaching, direct regeneration displays lower energy consumption and higher element recovery, making it regarded as a next-generation approach. In the pre-treatment process, however, the obtained electrode materials are mixed (e.g., LiFePO4 and graphite), resulting in low leaching efficiency and inferior regeneration performance. Also, direct regeneration processes still suffer from long treatment durations and high energy requirements. It is thus important for recycling used batteries to explore highly effective separation and regeneration methods.
Methods Based on the particle size of raw material, three graded products involved coarse fraction (i.e., +0.21 mm), medium fraction (i.e., -0.21 mm - +0.15 mm), and fine fraction (i.e., -0.15 mm). Magnetic separation experiments on each fraction were conducted, separately. The coarse fraction was processed at a pulsation frequency of 200 times/min and a background magnetic field intensity of 1.0 T, the medium fraction at 240 times/min and 1.2 T, and the fine fraction at 260 times/min and 1.6 T. 5 g of pre-heating waste graphite was placed in 20 mL of hydrochloric acid solution as a stripping solution. After stirring for 5 h, the mixture was washed for three times with deionized water and then further cleaned for three times with an ethanol solution, enabling the short-process regeneration of graphite material.
Results and discussion The pre-classification, magnetic separation, and "surface peeling" regeneration are applied to transform mixed electrode materials into regenerated products. Used LiFePO4 typically exhibits large bulk sizes, while used graphite particles are comparatively smaller. At the particle size of < 0.075 mm, the carbon content reaches 86.35%. Evidently, simple sieving effectively separates the mixed components. The resulting tailings primarily consist of carbonaceous material (96.53%) and impurities after magnetic separation. To address the detrimental effects of residual impurities, a "surface peeling" regeneration method is developed for used graphite. Increasing the number of treatment cycles progressively tailors surface/near-surface properties, while removing impurities. The related analysis reveals that high-temperature active atmospheres promote an impurity evolution, while acid solutions facilitate their removal. Based on the water-gas shift reaction principles, active carbon atoms react with water, eliminating degraded surface/near-surface layers to yield regenerated graphite. The physicochemical characterization indicates that the regenerated samples exhibit high graphitization, smooth surfaces, and reduced particle sizes. As LIB anodes, these materials deliver a capacity of 320 mA·h·g-1 at 1.0 C after 300 cycles, with an initial Coulombic efficiency of >80%. At 2.0 C, a capacity retention remains 280 mA·h·g-1 for over 300 cycles. Increased "surface peeling" cycles shortens activation time due to the optimized surface/near-surface properties, enhancing lithium-ion diffusion. The kinetic analysis indicates that excessive "surface peeling" treatments damage surface structures, while increasing pseudocapacitive contributions. At 0.9 mV·s-1, pseudocapacitive contributions reach 75%, with a lithium-ion diffusion coefficient of 4.0 × 10-11 cm2·s-1, demonstrating a significant physicochemical evolution.
Conclusions For the promising potential of used LIB graphite, effective recovery methods (i.e., from separation of mixed materials to graphite regeneration) were used. Used LIB materials consisted of large LiFePO4 bulks and small graphite particles. For pre-classification, the mixed materials were segregated by particle size ranges, i.e., larger fractions were predominantly LiFePO4, while smaller fractions were primarily graphite. At particle sizes of < 0.075 mm, carbon content reached 86.35%, with LiFePO4 (12.03%) and some impurities. The magnetic separation increased carbon content to >96%, achieving an effective separation of mixed electrode materials. Subsequently, used graphite was regenerated by "surface peeling" strategie, removing impurities (i.e., conductive carbon, Al, Cu, and LiFePO4) and tailoring surface/near-surface properties. The optimized sample with a reduced particle size exhibited smooth surfaces and high graphitization. As LIB anodes, these materials delivered the electrochemical performance up to 323 mA·h·g-1 at 1.0 C. The analysis revealed that tailored diffusion channels played a key role in enhancing reversible lithium-ion storage and deep insertion behaviors. This work could provide effective all-process recycling strategies from pre-classification and separation to regeneration, while elucidating the regeneration mechanism of used graphite.
, authors=Honghu TANG, Yixin FU, Chen LIU, Yue YANG, Peng GE, authorsList=Honghu TANG, Yixin FU, Chen LIU, Yue YANG, Peng GE, authorCompany=null, correspAuthors=Peng GE, authorNote=
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废旧锂离子电池中含有丰富的有价元素及有机物，若无妥善处理，将会造成严重的环境污染及资源浪费。经过传统的废旧电池预处理所获得的高纯度正负极混合料，进行酸浸或者直接再生将会导致生产效率低、再生性能差等问题。且废旧石墨材料的回收目前面临着高能耗等问题。基于此，通过“废旧电池粉料预分离-梯度磁选深度分离-剥壳再生”全链条联合技术，实现了废旧电池粉末的高效分离及废旧石墨的短流程再生，所获再生石墨展现出较高的纯度、石墨化度及光滑的表面。在1.0 C的电流密度下，300个圈次循环后，容量可维持323 mA·h·g-1。该工作期望为废旧电池混合粉末的高效分离及废旧石墨的短流程修复再生提供可靠途径。
, authors=唐鸿鹄, 符义昕, 刘晨, 杨越, 葛鹏, authorsList=唐鸿鹄, 符义昕, 刘晨, 杨越, 葛鹏, authorCompany=null, correspAuthors=葛鹏, authorNote=
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葛鹏（1990—），男，博士，教授。
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唐鸿鹄（1988—），男，博士，副教授。
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