Capacity Fading Mechanisms of Silicon Nanoparticle Negative Electrodes for Lithium Ion Batteries
Capacity Fading Mechanisms of Silicon Nanoparticle Negative Electrodes for Lithium Ion Batteries
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DOI：
10.1149/2.0731512jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
T. Yoon;Cao Cuong Nguyen;Daniel M. Seo;B. Lucht
中科院分区：
文献类型：
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作者：
T. Yoon;Cao Cuong Nguyen;Daniel M. Seo;B. Lucht
对循环过程中硅纳米颗粒电极电压分布的演变进行了彻底分析。电压分布的最大变化发生在硅纳米颗粒锂化的早期阶段（> 0.16 V vs Li/Li + ）。电压分布的变化表明硅电极的主要失效机制与不完全失效有关。硅电极在循环过程中脱锂。脱锂不完全的原因是脱锂过程中电阻增加，这主要是接触和固体电解质界面（S EI）电阻。通过降低脱锂截止电压或引入电解质添加剂，可以显着提高容量保持率，从而产生优异的SEI。提高的容量保持率归因于接触和 SEI 阻力的减少。©作者 2015。由 ECS 出版。这是一篇开放访问文章，根据 Creative Commons Attribution4.0 许可证 (C CBY，http://creativecommons.org/licenses/by/4.0/)，允许在任何媒介上不受限制地重复使用该作品，前提是正确引用了原始作品。[DOI:10.1149/2.0731512jes]保留所有权利。
A thorough analysis of the evolution of the voltage profiles of silicon nanoparticle electrodes upon cycling has been conducted. The largest changes to the voltage profiles occur at the earlier stages ( > 0.16 V vs Li/Li + ) of lithiation of the silicon nanoparticles. The changes in the voltage profiles suggest that the predominant failure mechanism of the silicon electrode is related to incomplete delithiationofthesiliconelectrodeduringcycling.Theincompletedelithiationisattributedtoresistanceincreasesduringdelithiation,whicharepredominantlycontactandsolidelectrolyteinterface(SEI)resistance.Thecapacityretentioncanbesignificantlyimprovedbyloweringdelithiationcutoffvoltageorbyintroducingelectrolyteadditives,whichgenerateasuperiorSEI.TheimprovedcapacityretentionisattributedtothereductionofthecontactandSEIresistance.©TheAuthor(s)2015.PublishedbyECS.ThisisanopenaccessarticledistributedunderthetermsoftheCreativeCommonsAttribution4.0License(CCBY,http://creativecommons.org/licenses/by/4.0/),whichpermitsunrestrictedreuseoftheworkinanymedium,providedtheoriginalworkisproperlycited.[DOI:10.1149/2.0731512jes]Allrightsreserved.