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相关概念视频

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
DC Battery01:21

DC Battery

A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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接表面的表轴层使所有固态硫化电池具有高负载.

Zhuomin Qiang1, Yanbin Ning1, Wei Zhao1

  • 1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

Science bulletin
|November 6, 2025
PubMed
概括

我们在硫化物全固态电池中稳定了高阴极,使用现场的氧化涂层. 这种表面工程方法可以防止副作用和结构损坏,提高电池性能和寿命.

关键词:
化学机械故障 化学机械故障固态电池是一种固态电池.硫化物电解质是硫化物的电解质.超高Ni的分层氧化物.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 电池技术 电池技术

背景情况:

  • 超高层氧化物阴极 (例如,LiNi0.9Co0.05Mn0.05O2或NCM90) 具有高能量密度,但在硫化物全固态电池 (ASSLB) 中存在表面反应性和应变问题.
  • 这些挑战导致界面不稳定性和结构退化,限制了ASSLB中高能量密度阴极的实际应用.

研究的目的:

  • 开发超高层氧化物阴极的有效表面修改策略,以提高它们在硫化物ASSLB中的稳定性和电化学性能.
  • 调查拟议的表面处理减轻界面副作用和结构疲劳的机制.

主要方法:

  • 使用氧化 (In2O3) 的现场转换策略用于处理NCM90阴极表面.
  • 使用先进技术进行了对待的阴极的特征,包括同步龙X射线断层扫描 (微/纳米CT) 和X射线吸收近边缘结构 (XANES).
  • 电化学性能被评估在硫化物ASSLBs与高阴极负荷 (9毫克厘米-2).

主要成果:

  • 在现场的氧化处理成功捕获了剩余的杂质,并重建了接近表面的结构,形成了一个符合形状的表轴层.
  • 这种重建的层有效地抑制了阴极-电解质接口上的自发副作用反应,并防止了大量的结构疲劳.
  • 在ASSLB中修改后的NCM90阴极实现了高可逆容量~2 mAh cm−2 (>190 mAh g−1在0.069 mA cm−2),卓越的循环稳定性和良好的速率能力.
  • 多个尺度的观测证实显著缓解了界面不稳定性和化学机械分解.

结论:

  • 通过现场的氧化转换进行表面工程是稳定超高层阴极的关键策略.
  • 这种方法提高了ASSLB的电化学性能和循环稳定性,为高能量密度应用铺平了道路.
  • 这些发现强调了解决接口现象对于下一代固态电池的发展的重要性.