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用于具有微型阳极的离子电池的高压电解质

Ai-Min Li¹, Zeyi Wang¹, Travis P Pollard²

¹Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20740, USA.

Nature communications

|February 8, 2024

概括

在离子电池中开发了一种用于微型阳极的新型高压电解质,可以防止容量衰减. 这一突破为商业应用提供了稳定,高能量密度的电池.

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
储能储能储能储能储能储能

背景情况:

微型阳极为离子电池提供高能量密度,但由于电解质透而遭受体积膨胀,裂和快速容量衰减.
现有的有机-无机界面和颗粒在循环过程中降解,导致电极胀和性能损失.

研究的目的:

为了应对离子电池中阳极不稳定的挑战.
设计一个高压电解质,形成稳定,恐惧的介面相.
提高微型阳极的循环寿命和能量密度.

主要方法:

一种新型高压电解质的设计和合成.
微型阳极 (5微米) 的制造,具有高负载 (4.1 mAh cm−2).
阳极和LiNi0.8Co0.15Al0.05O2袋全细胞的电化学测试.

主要成果:

设计的电解质使微型阳极能够达到99.8%的库伦比克效率和2175 mAh的g-1容量超过250个循环.
全电池在120个循环中表现出172mAhg-1的高容量,高于99.9%的库伦比效率.
电解质成功形成了与-合金相结合较弱的恐惧界面,减轻了体积膨胀问题.

结论:

开发的高压电解质通过形成恐惧界面,有效地稳定微型阳极.
这种方法显著改善了循环寿命和库伦比克效率,克服了阳极商业化的主要障碍.
这些发现为下一代高能量密度离子电池铺平了道路,使用微型阳极.

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