High‐Coulombic‐Efficiency Carbon/Li Clusters Composite Anode without Precycling or Prelithiation

Tian, Ruijun; Duan, Huanan; Guo, Yiping; Li, Hua; Liu, Hezhou

doi:10.1002/smll.201802226

Cited by 30 publications

(19 citation statements)

References 40 publications

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“…When discharging 2 mA h cm −2 Li on CC@CN-Co host, these 2D nanosheet units become much thicker compared with the pristine CN-Co (Figure 5a and Figure S7a, Supporting Information), which implies that the main electrochemical reaction is the insertion of Li + into C to form Li x C 6 . [30,31] After discharging to 4 mA h cm −2 , the voltage shows slight increase and begins to enter a smooth plateau, beneath 0 V (vs Li + /Li), that illustrates determined Li deposition on the CC@CN-Co. Exactly, SEM images in Figure 5b and Figure S7b (Supporting Information) demonstrate that Li is spread across the whole host and uniformly plated on the surface and interspace of carbon-based fibers.…”

Section: Resultsmentioning

confidence: 99%

“…To investigate the Li metal deposition process, coin cells were assembled with CC@CN‐Co as the working electrode and Li foil as the counter electrode, and preceded a galvanostatic discharge at 1 mA cm −2 ( Figure e and Figure S6, Supporting Information). When discharging 2 mA h cm −2 Li on CC@CN‐Co host, these 2D nanosheet units become much thicker compared with the pristine CN‐Co (Figure 5a and Figure S7a, Supporting Information), which implies that the main electrochemical reaction is the insertion of Li + into C to form Li x C 6 30,31. After discharging to 4 mA h cm −2 , the voltage shows slight increase and begins to enter a smooth plateau, beneath 0 V (vs Li + /Li), that illustrates determined Li deposition on the CC@CN‐Co.…”

Section: Resultsmentioning

confidence: 99%

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Regulating Lithium Nucleation and Deposition via MOF‐Derived Co@C‐Modified Carbon Cloth for Stable Li Metal Anode

Zhou

Shen

Wang

et al. 2020

Adv Funct Materials

183

129

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Lithium metal is an exciting anode candidate with extra high theoretical specific capacity for new high‐energy rechargeable batteries. However, uncontrolled Li deposition and an unsteady solid electrolyte interface seriously obstruct the commercial application of Li anodes in Li metal batteries. Herein, 3D carbon cloth (CC) supporting N‐doped carbon (CN) nanosheet arrays embedded with tiny Co nanoparticles (CC@CN‐Co) are employed as a lithiophilic framework to regulate homogenous Li nucleation/growth behavior in a working Li metal anode. The emergence of Li dendrites is supposed to be inhibited by the conductive 3D scaffold that reduces local current density. The uniform nucleation of Li can be guided by N‐containing functional groups as they have a strong interaction with Li atoms, and the tiny Co nanoparticles can provide active sites to guide Li deposition. As a result, the current CC@CN‐Co host exhibits Li dendrite–free features and stable cycling performance with a low overpotential (20 mV) throughout 800 h cycles. When paired with the typical LiFePO4 (LFP) cathode, the assembled CC@CN‐Co@Li//LFP@C full cell exhibits outstanding rate capability and improved cycling performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Regulating Lithium Nucleation and Deposition via MOF‐Derived Co@C‐Modified Carbon Cloth for Stable Li Metal Anode

Zhou

Shen

Wang

et al. 2020

Adv Funct Materials

183

129

View full text Add to dashboard Cite

show abstract

“…Vertically grown graphene nanosheets on the surface of the CC are synthesized by a PECVD (Ghosh et al, 2017). CC consists of interconnected carbon nanofibers with good flexibility, strong mechanical strength and high electron transport capability (Figure S1; Tian et al, 2018a). However, CC is lithiophibic with limited surface area (Liu F. et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Dendrite-Free Li Metal Plating/Stripping Onto Three-Dimensional Vertical-Graphene@Carbon-Cloth Host

Yan

et al. 2019

Front. Chem.

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Lithium metal is deemed as an ideal anode material for next-generation lithium ion batteries (LIBs) due to its high specific capacity and low redox potential. However, uncontrolled lithium dendrite formation during electrochemical deposition leads to a low Coulombic efficiency and serious safety issues, dragging metallic lithium anodes out of practical application. One promising strategy to suppress lithium dendrite issues is employing a three-dimensional host with admirable conductivity and large surface area. Herein, a vertical graphene nanosheet grown on carbon cloth (VG/CC) synthesized is adopted as the Li deposition host. The three-dimensional VG/CC with a large surface area can provide abundant active nucleation sites and effectively reduce the current density, leading to homogeneous Li deposition to overcome the dendrite issue. The Li@VG/CC anode exhibits a dendrite-free morphology after a long cycle and superior electrochemical performance to that of planar Cu current collector. It delivers a small voltage hysteresis of 90.9 mV at a high current density of 10 mA cm−2 and a Coulombic efficiency of 99% over 100 cycles at 2 mA cm−2. Our results indicate that this all-carbon-based nanostructure host has great potential for next-generation Li metal batteries.

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“…The abundant pores also provide large space to confine deposited Li and relief the volume fluctuation. Functionalized carbon hosts with lithiophilic sites can regulate the homogeneity of Li‐ion flux and promote the uniform Li deposition …”

Section: Host Materialsmentioning

confidence: 99%

A Review of Composite Lithium Metal Anode for Practical Applications

Shi

Zhang

Shen

et al. 2019

Adv Materials Technologies

127

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potential (−3.040 V vs standard hydrogen electrode). [8][9][10] Objectively, the energy density of Li batteries should take all parts of a battery into considerations instead of only anode. In order to achieve high-energydensity Li batteries, practical conditions including limited Li (<10 mAh cm −2 ), low negative/positive capacity (N/P) ratio (<3), and lean electrolyte are necessary. [11,12] In addition, fast charge is imperative with the popularization of portable electronics and electrical vehicles. [13] Consequently, high charge current density (>3 mA cm −2 ) is a confronted issue.Nowadays, the practical applications of Li batteries are still hindered by the formation of Li dendrites, rapid pulverizations of Li metal, and volume fluctuation. [14][15][16] Tremendous efforts have been devoted to disclosing the mechanism of Li plating/stripping and developing strategies to regulate its behaviors thus extending the lifespan of Li batteries during the past half century, including electrolyte formulations, [17][18][19][20][21][22][23][24][25][26][27] interfacial modifications, [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] solid-state electrolytes, [45][46][47][48][49][50][51][52][53][54][55] composite anodes, [56][57][58][59][60][61][62][63] and so on. [64] Thereinto, composite Li anode emerges as a promising strategy to regulate Li plating/stripping behaviors and promote the advances of Li batteries.Generally, a composite Li anode is composed of a 3D host and fresh Li metal. The 3D host is endowed with the unique surface chemistry and interconnecting structure. [65] The superiorities contributed by composite Li anode mainly include:(1) improving electronic conductivity, such as decreasing areal current density and avoiding the generation of "dead Li." Conductive hosts with high specific surface area, such as carbon-based and metal-based hosts, can decrease areal current density to prolong the time for depletion of ion at the anode surface to induce dendritic Li according to Sand's time model. [66] Therefore, the formation of Li dendrites will be effectively inhibited at low areal current density and the cyclability can be improved effectively.(2) Homogenizing Li-ion flux over the surface of Li metal. The distribution of Li ions over the surface of Li anode impacts the subsequent Li plating/stripping behaviors significantly. Uniform Li plating/ stripping can be improved by regulating the interactions between lithiophilic sites on 3D host surface, such as polar functional groups, [67,68] and Li ion to homogenize Li-ion flux. [69] (3) Maintaining dimensional stability of anode. 3D hosts can confine plating Li in the inside pores to avoid the Lithium (Li) metal is considered as a promising anode candidate for nextgeneration batteries owing to its extremely high specific capacity and low reduction potential. However, Li metal anode is still hindered by uncontrolled Li dendrites and extreme volume fluctuation. Composite Li metal anode emerges as an attractive strategy to suppress Li dendrites and ...

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High‐Coulombic‐Efficiency Carbon/Li Clusters Composite Anode without Precycling or Prelithiation

Cited by 30 publications

References 40 publications

Regulating Lithium Nucleation and Deposition via MOF‐Derived Co@C‐Modified Carbon Cloth for Stable Li Metal Anode

Regulating Lithium Nucleation and Deposition via MOF‐Derived Co@C‐Modified Carbon Cloth for Stable Li Metal Anode

Dendrite-Free Li Metal Plating/Stripping Onto Three-Dimensional Vertical-Graphene@Carbon-Cloth Host

A Review of Composite Lithium Metal Anode for Practical Applications

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