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Construction and Testing of Coin Cells of Lithium Ion Batteries

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Published on: August 2, 2012

表面空隙工程重新路由稳定丰富层级阴极的第一循环再氧化.

Seongkoo Kang¹, Dayeon Choi¹, Suwon Lee¹

¹Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea.

Angewandte Chemie (International ed. in English)

|November 5, 2025

概括

富含的层状氧化物中工程表面障碍可以防止氧气释放和晶格崩. 这提高了高能量密度阴极的第一循环效率和耐用性.

关键词:

这是一种混乱的混乱,一种混乱的混乱.离子电池是一种离子电池.富含的多层阴极是丰富的.氧氧氧氧化还氧化过程工程职位空缺工程职位空缺

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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
表面化学表面化学

背景情况:

富层氧化物 (LRLO) 对高能量密度电池具有前景.
第一个周期的性能下降,包括氧气释放和晶格崩,限制了LRLO的应用.
控制表面化学是缓解这些降解途径的关键.

研究的目的:

调查原子尺度的表面障碍如何影响LRLO中的氧化还原序列.
为提高Li_1.14Ni_0.32Mn_0.54O₂ (LNMO) 阴极的电化学性能和稳定性制定一个战略.
建立耐用LRLO阴极的一般设计原则.

主要方法:

用化学处理在LNMO中引入表面氧气和过渡金属空缺.
多模态同步子分析 (例如,X射线衍射,X射线吸收光谱) 用于表征表面结构和氧化状态.
电化学测试用于评估第一周期库伦比克效率,电压衰减和容量保留.

主要成果:

在LNMO中成功地引入了表面空白,局限于粒子表面.
经过处理的LNMO表现出低于4.4V的早期氧化和延迟的氧化.
观察到抑制有害的Ni⁴⁺─O共价状态,不可逆转的氧气释放和溶解.
修改后的氧化还原路径在高电压下保持了金属-氧气协调.

结论:

原子尺度的表面干扰有效地控制了LRLO中的第一循环氧化还原序列.
工程表面空隙防止氧气释放和晶格崩,提高电化学性能.
这项工作为开发稳定,高能量密度的LRLO阴极提供了一般的设计策略.