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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Ultrastable Anode/Electrolyte Interface in Solid-State Lithium-Metal Batteries Using LiCu Nanowire Network Host.

Qiushi Dai1, Jun Zhao1, Hongjun Ye1

  • 1Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P. R. China.

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|September 2, 2021
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Summary

Researchers developed a novel composite anode using a 3D lithium-copper nanowire network for solid-state lithium-metal batteries. This Li* anode significantly reduces interfacial resistance and suppresses lithium dendrite growth, enhancing battery stability and performance.

Keywords:
LiCux NWanode/electrolyte interfacegarnet solid-state electrolytelithium anodenanowire host

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state lithium-metal batteries (SSLMBs) face challenges from high interfacial resistance and lithium dendrite growth, leading to premature failure.
  • These issues hinder the practical application of SSLMBs, necessitating advanced anode designs for improved safety and longevity.

Purpose of the Study:

  • To synthesize a composite anode with a 3D lithium-copper nanowire network (Li* anode) for SSLMBs.
  • To investigate the Li* anode's ability to lower interfacial impedance and suppress lithium dendrites.
  • To evaluate the electrochemical performance of SSLMBs utilizing the Li* anode with various cathodes.

Main Methods:

  • Fabrication of the Li* anode by dissolving copper foil in molten lithium, followed by solidification.
  • Infiltration of the 3D lithium-copper nanowire network with lithium.
  • Assembly and testing of Li*/Li6.4La3Zr1.4Ta0.6O12 (LLZTO)/Li* symmetrical cells and full cells with LiNi0.88Co0.1Al0.02O2 (NCA), LiFePO4 (LFP), and FeF2 cathodes.

Main Results:

  • The Li* anode demonstrated excellent wettability with LLZTO, high mechanical strength, low interfacial impedance, and effective suppression of lithium dendrites.
  • Symmetrical cells achieved a cycle lifetime of 10,000 hours at 0.1 mA·cm-2.
  • Full cells exhibited remarkable performance: Li*/LLZTO/NCA maintained 73.4% capacity after 500 cycles at 0.5C, and Li*/LLZTO/FeF2 achieved 147 mAh·g-1 after 500 cycles at 100 mA·g-1.

Conclusions:

  • The developed Li* anode significantly enhances the stability and electrochemical performance of SSLMBs by addressing interfacial challenges.
  • The 3D lithium-copper nanowire network provides a robust host for lithium, promoting homogeneous deposition and dendrite-free cycling.
  • This design strategy offers a promising pathway for creating ultrastable solid-state lithium-metal batteries.