Surface phonons of lithium ion battery active materials

被引：22

作者：

Benedek, Peter ^{[1
]}

Yazdani, Nuri ^{[1
]}

Chen, Hungru ^{[2
]}

Wenzler, Nils ^{[1
]}

Juranyi, Fanni ^{[3
]}

Mansson, Martin ^{[4
]}

Islam, M. Saiful ^{[2
]}

Wood, Vanessa C. ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland

[2] Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England

[3] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

[4] KTH Royal Inst Technol, Dept Appl Phys, SE-16440 Stockholm, Kista, Sweden

来源：

SUSTAINABLE ENERGY & FUELS | 2019年 / 3卷 / 02期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会; 瑞典研究理事会;

关键词：

CATHODE MATERIALS; LIFEPO4; DIFFUSION; ELECTROCHEMISTRY; VISUALIZATION; CONDUCTIVITY; MORPHOLOGY; DEFECTS; GROWTH;

D O I：

10.1039/c8se00389k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Surfaces of active materials are understood to play an important role in the performance and lifetime of lithium-ion batteries, but they remain poorly characterized and therefore cannot yet be systematically designed. Here, we combine inelastic neutron scattering and ab initio simulations to demonstrate that the structure of the surface of active materials differs from the interior of the particle. We use LiFePO4 (LFP) as a model system, and we find that carbon coating influences the Li-O bonding on the (010) LFP surface relative to the bulk. Our results highlight how coatings can be used to systematically engineer the vibrations of atoms at the surface of battery active materials, and thereby impact lithium ion transport, charge transfer, and surface reactivity.

引用

页码：508 / 513

页数：6

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