Article(id=1321945501717606957, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1321945912352559151, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20250247, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1743609600000, receivedDateStr=2025-04-03, revisedDate=1745596800000, revisedDateStr=2025-04-26, acceptedDate=null, acceptedDateStr=null, onlineDate=1793105968169, onlineDateStr=2026-10-27, pubDate=1768838400000, pubDateStr=2026-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793105968169, onlineIssueDateStr=2026-10-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793105968169, creator=13701087609, updateTime=1793105968169, updator=13701087609, issue=Issue{id=1321945912352559151, tenantId=1146029695717560320, journalId=1263187385517883426, year='2026', volume='54', issue='1', pageStart='1', pageEnd='350', issueExtLink='null', onlineDate='null', pubDate='1767715200000', pubDateStr='2026-01-07', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793106066072, creator='13701087609', updateTime=1793106066072, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=143, endPage=151, ext={EN=ArticleExt(id=1321945501944099374, articleId=1321945501717606957, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Precursor Densification Strategy to Synthesis of Single Crystal Li-Rich Mn-Based Cathode Materials, columnId=1263922769897599102, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=
Introduction Li-rich Mn-based cathode materials have become an important candidate for next generation lithium-ion battery cathodes due to their high discharge specific capacity and wide voltage window. The Li-rich Mn-based oxide xLi2MnO3·(1-x)LiTMO2 (TM=Mn、Ni、Co、Fe, etc.) exhibits advantages such as high energy density (~1000 W·h·kg-1), and low cost. The layered Li-rich material consists of two components: LiTMO2 and Li2MnO3. The Li2MnO3 component can be activated during the first charge above 4.5 V, and the oxygen redox reaction provides unique high capacity. However, severe side reactions and irreversible lattice oxygen release can trigger particle cracking, microcracks, and gas generation, leading to significant electrochemical performance degradation. Single-crystallization of particles, by eliminating grain boundaries, helps improve the structural stability of cathode materials and represents an effective strategy for enhancing battery cycling performance.
Methods This study developed a simple and effective synthesis method to obtain micron-sized single-crystal Li-rich Mn-based cathode materials. Specifically, Mn0.54Co0.13Ni0.13(CO3)0.8 precursor was synthesized using a carbonate co-precipitation method. The synthesized precursor was then mixed with 5% excess of Li2CO3 in a mortar. The mixture was loaded into a cylindrical pellet die with a diameter of 14 mm, and 300 MPa pressure was applied to the powder mixture in the cylindrical die and maintained for 1 min before removal. A two-step calcination process (with a heating rate of 3 ℃·min-1) was employed, with the sample calcined in air at 500 ℃ for 3 h, and at 950 ℃ for 15 h. Finally, the sample was cooled to room temperature and ground to obtain the lithium-rich single-crystal material Li1.2Mn0.54Ni0.13Co0.13O2 (LR-SC).
Results and discussion By employing a precursor densification strategy to reduce interfacial fusion resistance between particles and enhance mass transfer at particle interfaces, it facilitated grain fusion growth and enabled the formation of micron-sized single-crystal particles of LR-SC with particle sizes ranging from 1 μm to 3 μm. The results indicate that the coin cell assembled with the single crystal material delivers an initial discharge capacity of 243.3 mA·h·g-1 at 0.2 C. Compared with polycrystals, the capacity retention rate after 200 cycles at 0.5 C is increased from 44.9% to 73.1%. The assembled pouch cell (10 mA·h) keeps 78.8% capacity retention rate after 250 cycles at 1 C, displaying remarkable rate capability and cycling stability.
Conclusions The synthesized single-crystal Li-rich Mn-based cathode material exhibits uniform particle size, superior interfacial stability and cycling stability. By comparing the failure processes of single-crystal particles and polycrystalline secondary spherical particles, its stabilization mechanism was revealed. Compared with typical polycrystalline cathodes, the single-crystal material mitigates the transformation of the layered structure of layer into spinel and rock-salt phases, releasing only minimal gas during the first cycle, significantly enhancing the safety and practicality of material applications. This method provides a simple and feasible way for synthesizing micron-sized single-crystal Li-rich Mn-based cathode materials.
, authors=Chang LIU, Shichao LI, Honglei LIU, Dongxu LIU, Chengzhi HU, Zeheng YANG, Weixin ZHANG, authorsList=Chang LIU, Shichao LI, Honglei LIU, Dongxu LIU, Chengzhi HU, Zeheng YANG, Weixin ZHANG, authorCompany=null, correspAuthors=Weixin ZHANG, authorNote=
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富锂锰基正极材料因其高放电比容量和宽电压窗口，成为下一代锂离子电池正极材料的重要选择。但其严重的晶界副反应和晶格氧的不可逆析出会引发颗粒破碎、微裂纹与产气，导致材料电化学性能衰减严重。颗粒单晶化因消除了晶界，有助于改善正极材料的结构稳定性，是一种有效提升电池循环性能的策略。本工作通过前驱体致密化策略降低颗粒界面融合阻力，结合高温煅烧制备了颗粒尺寸1～3 μm的单晶富锂锰基材料Li1.2Mn0.54Ni0.13Co0.13O2 （LR-SC）。结果表明：前驱体致密化促进颗粒界面处的扩散传质，有利于晶粒融合生长，易于形成微米级单晶颗粒。基于该单晶材料组装的扣式电池在 0.2 C首次放电比容量达243.3 mA·h·g-1。与多晶材料相比，其在0.5 C循环200圈容量保持率从44.9%提高至73.3%；基于单晶材料组装的软包电池（10 mA·h）在1 C循环250圈后容量保持率为78.8%，展现了良好的倍率性能和循环稳定性。该方法为合成微米级单晶富锂锰基正极材料提供了一条简单可行的途径。
, authors=刘畅, 李世超, 刘红雷, 刘东旭, 胡成志, 杨则恒, 张卫新, authorsList=刘畅, 李世超, 刘红雷, 刘东旭, 胡成志, 杨则恒, 张卫新, authorCompany=null, correspAuthors=张卫新, authorNote=
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张卫新（1969—），女，博士，教授。
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LIU Chang (2000-), male, Master candidate. E-mail: 2417549775@qq.com
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LIU Chang (2000-), male, Master candidate. E-mail: 2417549775@qq.com
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刘畅（2000—），男，硕士研究生。
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刘畅（2000—），男，硕士研究生。
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