A Graphene-Coated Thermal Conductive Separator to Eliminate the Dendrite-Induced Local Hotspots for Stable Lithium Cycling

Duzhao Han; Xiaowei Wang; Ya-Nan ZhouJiyong ZhangZhongxin LiuZichun XiaoJiangqi ZhouZhen WangJiangfeng ZhengZhanhui JiaBingbing TianJingying XieZhaolin LiuWei Tang

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A Graphene-Coated Thermal Conductive Separator to Eliminate the Dendrite-Induced Local Hotspots for Stable Lithium Cycling

机译：A Graphene-Coated Thermal Conductive Separator to Eliminate the Dendrite-Induced Local Hotspots for Stable Lithium Cycling

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Practical lithium metal batteries (LMBs) are still far from market readiness, asa result of the severe Li degradation and safety issues caused by Li dendrites.Herein, by studying the thermodynamic behavior of lithium deposition, it isunveiled that the tip area of Li metal has an increasing heat generation rate asa function of the deposition time and overpotential. This triggers the emergenceof the accumulated overpotential heat and local temperature “hotspots”due to poor local thermal diffusion, which exacerbates the undesirableirregular Li deposition and dendrite growth. To address this issue, a thermallyconductive graphene-coated separator is constructed to eliminate these localhotspots. The graphene layer affords timely diffusion of local heat generatedby irregular Li growth and incipient dendrite formation, achieving the stableand uniform lithium deposition to deter further degradation. As a result, theLi metal, suffering a drastic Coulombic efficiency (CE) decay to ≈60% using aconventional separator, can be recovered for continual cycling with a high CEof >95%. Notably, the corresponding Li‖LiNi_(0.8)Mn_(0.1)Co_(0.1)O_2 cells present highcapacity retention and recovery. This study highlights the thermodynamicfactor of Li dendrite-induced local heat and its elimination to preclude Lianode deterioration, which provides insight into Li metal protection strategiesfor high performance LMBs.

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来源
《Advanced energy materials》 |2022年第25期|2201190.1-2201190.11|共11页
作者
Duzhao Han; Xiaowei Wang; Ya-Nan ZhouJiyong ZhangZhongxin LiuZichun XiaoJiangqi ZhouZhen WangJiangfeng ZhengZhanhui JiaBingbing TianJingying XieZhaolin LiuWei Tang;
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School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an, Shaanxi 710049, China;

Institute of Materials Research and EngineeringA*STAR2 Fusionopolis WayInnovis 138634, Singapore;

State Key Laboratory of Space Power-Sources TechnologyShanghai Institute of Space Power SourcesShanghai 200245, ChinaGuangdong Jiana Energy Technology Co., Ltd.Guangzhou 511449, ChinaState Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an, Shaanxi 710049, ChinaShenzhen UniversityShenzhen 518000, China;

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electrochemical-heat coupled simulation; graphene; Li metal anodes; local hotspots; thermally conductive membranes;

A Graphene-Coated Thermal Conductive Separator to Eliminate the Dendrite-Induced Local Hotspots for Stable Lithium Cycling

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