From Micro to Nano: Boosting γ-MnO2 Cathode Performance through Particle Size Engineering

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2026-10-12 DOI:10.1021/acs.nanolett.6c04092

Ella Davidi,Isaac Loke,Samuel Eisenberg,Xinzhe Xue,Megan C. Freyman,Asya Orhan,Erika P. Ramos,Jianchao Ye,Seongkoo Cho,Makena White,Christopher Nelson,Hanyu Wang,Christine A. Orme,Bruce Dunn,Marcus A. Worsley,Yat Li

{"title":"From Micro to Nano: Boosting γ-MnO2 Cathode Performance through Particle Size Engineering","authors":"Ella Davidi,Isaac Loke,Samuel Eisenberg,Xinzhe Xue,Megan C. Freyman,Asya Orhan,Erika P. Ramos,Jianchao Ye,Seongkoo Cho,Makena White,Christopher Nelson,Hanyu Wang,Christine A. Orme,Bruce Dunn,Marcus A. Worsley,Yat Li","doi":"10.1021/acs.nanolett.6c04092","DOIUrl":null,"url":null,"abstract":"Fast-charging lithium-ion batteries require cathodes that sustain rapid Li+ transport while maintaining structural and interfacial stability. Here, we investigate particle-size effects in γ-MnO2 by comparing micron-sized (4.4 ± 0.8 μm) and nanosized (62 ± 21 nm) particles under identical conditions. Nanosized γ-MnO2 delivers 160.1 mAh g–1 at C/10 and retains ∼66% capacity at 5C while exhibiting lower charge-transfer and diffusion-related impedance. Cyclic voltammetry and Dunn’s analysis reveal a 68.9% capacitive contribution at 2 mV s–1, indicating a shift toward faster surface-controlled charge storage enabled by increased surface area and shorter Li+ diffusion pathways. GITT measurements show deeper lithiation (x ≈ 0.65 vs 0.48 in LixMnO2) and a more homogeneous solid-solution-like intercalation regime in nanosized particles, avoiding bulk phase-transition kinetic bottlenecks. The nanosized cathode retains 70% capacity with ∼99.5% Coulombic efficiency after 400 cycles at 3C, demonstrating particle-size engineering as an effective strategy for high-rate, long-life advanced battery energy storage.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"13 1","pages":""},"PeriodicalIF":9.1000,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Letters","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acs.nanolett.6c04092","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Fast-charging lithium-ion batteries require cathodes that sustain rapid Li+ transport while maintaining structural and interfacial stability. Here, we investigate particle-size effects in γ-MnO2 by comparing micron-sized (4.4 ± 0.8 μm) and nanosized (62 ± 21 nm) particles under identical conditions. Nanosized γ-MnO2 delivers 160.1 mAh g–1 at C/10 and retains ∼66% capacity at 5C while exhibiting lower charge-transfer and diffusion-related impedance. Cyclic voltammetry and Dunn’s analysis reveal a 68.9% capacitive contribution at 2 mV s–1, indicating a shift toward faster surface-controlled charge storage enabled by increased surface area and shorter Li+ diffusion pathways. GITT measurements show deeper lithiation (x ≈ 0.65 vs 0.48 in LixMnO2) and a more homogeneous solid-solution-like intercalation regime in nanosized particles, avoiding bulk phase-transition kinetic bottlenecks. The nanosized cathode retains 70% capacity with ∼99.5% Coulombic efficiency after 400 cycles at 3C, demonstrating particle-size engineering as an effective strategy for high-rate, long-life advanced battery energy storage.

Abstract Image

查看原文本刊更多论文

从微观到纳米：通过粒度工程提高γ-MnO2阴极性能

快速充电的锂离子电池要求阴极在保持结构和界面稳定性的同时保持Li+的快速传输。本文通过比较微米（4.4±0.8 μm）和纳米（62±21 nm）颗粒在相同条件下对γ-MnO2的粒径影响进行了研究。纳米尺寸的γ-MnO2在C/10时提供160.1 mAh g-1，在5C时保持约66%的容量，同时表现出较低的电荷转移和扩散相关阻抗。循环伏安法和Dunn的分析显示，在2mv s-1下，电容性贡献为68.9%，表明通过增加表面积和缩短Li+扩散路径，可以实现更快的表面控制电荷存储。GITT测量结果显示，LixMnO2的锂化程度更深（x≈0.65 vs 0.48），并且在纳米颗粒中具有更均匀的类似固溶体的插层结构，避免了大块相变动力学瓶颈。该纳米级阴极在3C下循环400次后仍能保持70%的容量和99.5%的库仑效率，证明了粒径工程是高速率、长寿命先进电池储能的有效策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.