Article(id=1319232581330125788, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319232566922695375, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20211077, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1639152000000, receivedDateStr=2021-12-11, revisedDate=1642176000000, revisedDateStr=2022-01-15, acceptedDate=null, acceptedDateStr=null, onlineDate=1792459157544, onlineDateStr=2026-10-20, pubDate=1658246400000, pubDateStr=2022-07-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792459157544, onlineIssueDateStr=2026-10-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792459157544, creator=13701087609, updateTime=1792459157544, updator=13701087609, issue=Issue{id=1319232566922695375, tenantId=1146029695717560320, journalId=1263187385517883426, year='2022', volume='50', issue='7', pageStart='1775', pageEnd='2066', issueExtLink='null', onlineDate='null', pubDate='1658246400000', pubDateStr='2022-07-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792459154109, creator='13701087609', updateTime=1792460038980, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319236278420357264, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319232566922695375, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319236278420357265, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319232566922695375, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1865, endPage=1874, ext={EN=ArticleExt(id=1319232583049790429, articleId=1319232581330125788, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Preparation and Electrochemical Properties of Truncated Octahedral LiFe_0.12Mn_1.88O₄ Cathode Materials, columnId=1263922769897599102, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=

Spinel LiMn₂O₄ cathode materials suffer a serious capacity decay and a poor cycle stability during the charge-discharge process due to the Jahn-Teller effect and Mn dissolution. A cathode material of truncated octahedral single crystal LiFe_0.12Mn_1.88O₄ with {111}, {100} and {110} surfaces was prepared by a solid-state combustion method and element doping and single crystal morphology controlling strategies. The results show that the crystal structure of spinel LiMn₂O₄ is not changed by Fe doping, the Jahn-Teller effect is effectively inhibited, the crystallinity and the selective growth of {400} and {440} diffraction peak crystal planes are promoted, and the material has superior rate performance and capacity retention. The initial discharge specific capacities at 1 C and 5 C at 25 ℃ are 105.2 mA·h/g and 92.4 mA·h/g, and the capacity retentions after 1 000 cycles are 71.1% and 75.2%, respectively. Moreover, the capacity retention reaches 88.4% after 1 000 cycles at 10 C. The initial discharge capacity of the material is 108.6 mA·h/g at 55 ℃ and 1 C, and the capacity retention rate is 79.1% after 150 cycles, and the capacity retention rate is 79.1% after 150 cycles. By using cyclic voltammetry and electrochemical impedance spectroscopy, we found that the Fe-doped sample has superior circulation reversibility and large Li⁺ diffusion coefficient. The Fe-doped material of truncated octahedral LiMn₂O₄ inhibits the Jahn-Teller effect, and slows down the Mn dissolution, thus stabilizing the crystal structure, increasing the Li⁺ migration channel, and improving the electrochemical rate performance and long cycle life.

, authors=Mei YANG¹, Yifei CHEN¹, Honglei LIU¹, Mingwu XIANG¹, Yujiao GUO^{1, 2}, Xiaofang LIU¹, Junming GUO¹, authorsList=Mei YANG, Yifei CHEN, Honglei LIU, Mingwu XIANG, Yujiao GUO, Xiaofang LIU, Junming GUO, authorCompany=null, correspAuthors=Yujiao GUO, Junming GUO, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319232583293060062, articleId=1319232581330125788, tenantId=1146029695717560320, journalId=1263187385517883426, language=CN, title=去顶角八面体LiFe_0.12Mn_1.88O₄正极材料制备及电化学性能, columnId=1263922770220560512, journalTitle=硅酸盐学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

尖晶石型LiMn₂O₄正极材料由于Jahn-Teller效应和Mn溶解，在充放电过程中容量衰减严重，循环稳定性差。联合元素掺杂和单晶形貌调控策略，采用固相燃烧法制备了具有{111}、{100}和{110}晶面的去顶角八面体单晶LiFe_0.12Mn_1.88O₄正极材料。研究结果表明，Fe掺杂没有改变尖晶石型LiMn₂O₄的晶体结构，有效抑制了Jahn-Teller效应，促进了材料的结晶性及{400}和{440}衍射峰晶面的择优生长，表现出良好的倍率性能和容量保持率。在25 ℃，1 C和5 C倍率下LiFe_0.12Mn_1.88O₄的首次放电比容量分别为105.2 mA·h/g和92.4 mA·h/g，1000次循环后容量保持率分别为71.1%和75.2%；在高倍率10 C下，经1000次循环后，其容量保持率可达到88.4%。在55 ℃和1 C条件下，首次放电比容量为108.6 mA·h/g，经150次循环后，容量保持率为79.1%。通过循环伏安和电化学阻抗分析，Fe掺杂材料具有较好的循环可逆性和较大的Li⁺扩散系数。Fe掺杂去顶角八面体LiMn₂O₄材料既抑制了Jahn-Teller效应，又减缓了Mn的溶解，稳定晶体结构，同时增加Li⁺迁移通道，提高电化学倍率性能及长循环寿命。

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YANG Mei (1998-), female, Master candidate. E-mail: 1837678628@qq.com

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YANG Mei (1998-), female, Master candidate. E-mail: 1837678628@qq.com

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杨梅（1998—），女，硕士研究生。

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杨梅（1998—），女，硕士研究生。

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