Li insertion into Li4Ti5O12 spinel prepared by low temperature solid state route: Charge capability vs surface area

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00487706" target="_blank" >RIV/61388955:_____/18:00487706 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00487706

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.electacta.2018.01.171" target="_blank" >http://dx.doi.org/10.1016/j.electacta.2018.01.171</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2018.01.171" target="_blank" >10.1016/j.electacta.2018.01.171</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Li insertion into Li4Ti5O12 spinel prepared by low temperature solid state route: Charge capability vs surface area

Popis výsledku v původním jazyce

Li4Ti5O12 spinel powders with different surface areas are prepared by a novel low temperature solid state route with subsequent mechanical disintegration. X-ray diffraction analysis proves the presence of majority of Li4Ti5O12 phase with small amount of rutile and WC impurities. Transmission electron microscopy analysis evidences the presence of two morphologies, larger Li4Ti5O12 crystals surrounded by nanocrystals of Li4Ti5O12. This finding is supported by cyclic voltammetry of Li insertion and electro-chemical impedance spectroscopy. The concentration ratio of these two morphologies in particular sample depends on its post ball milling time. Cyclic voltammetry of Li insertion and galvanostatic chronopotentiometry at 1C rate confirm the highest charge capacity for Li4Ti5O12 spinel with surface area of 21 m(2) g(-1). Due to optimized ratio of two particular morphologies this material (coded LTO_21) without any carbonaceous additive possesses excellent long time cycling stability during galvanostatic chronopotentiometry at 1, 2 and 5C. Its discharge capacities reach 170 mAh g(-1) at 1C, 167 mAh g(-1) at 2C and 160 mAh g(-1) at 5C rates with 100% coulombic efficiency. The capacity drop was less than 1% for charging rates of 1 and 2C and about 5% at 5C. The discharge capacity of all the reported samples significantly outperforms that of commercial lithium titanate (Aldrich) with surface area of 12.5 m(2) g(-1) exhibiting discharge capacities of 95 mAh g(-1) (cyclic voltammetry) and 77 mAh g(-1) or 35 mAh g(-1) in galvanostatic chronopotentiometry at 1 or 2C rates, respectively. Hence, our novel low temperature solid state route with subsequent mechanical disintegration represents energy saving pathway towards promising anode materials for fast and stable Li-ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

Li insertion into Li4Ti5O12 spinel prepared by low temperature solid state route: Charge capability vs surface area

Popis výsledku anglicky

Li4Ti5O12 spinel powders with different surface areas are prepared by a novel low temperature solid state route with subsequent mechanical disintegration. X-ray diffraction analysis proves the presence of majority of Li4Ti5O12 phase with small amount of rutile and WC impurities. Transmission electron microscopy analysis evidences the presence of two morphologies, larger Li4Ti5O12 crystals surrounded by nanocrystals of Li4Ti5O12. This finding is supported by cyclic voltammetry of Li insertion and electro-chemical impedance spectroscopy. The concentration ratio of these two morphologies in particular sample depends on its post ball milling time. Cyclic voltammetry of Li insertion and galvanostatic chronopotentiometry at 1C rate confirm the highest charge capacity for Li4Ti5O12 spinel with surface area of 21 m(2) g(-1). Due to optimized ratio of two particular morphologies this material (coded LTO_21) without any carbonaceous additive possesses excellent long time cycling stability during galvanostatic chronopotentiometry at 1, 2 and 5C. Its discharge capacities reach 170 mAh g(-1) at 1C, 167 mAh g(-1) at 2C and 160 mAh g(-1) at 5C rates with 100% coulombic efficiency. The capacity drop was less than 1% for charging rates of 1 and 2C and about 5% at 5C. The discharge capacity of all the reported samples significantly outperforms that of commercial lithium titanate (Aldrich) with surface area of 12.5 m(2) g(-1) exhibiting discharge capacities of 95 mAh g(-1) (cyclic voltammetry) and 77 mAh g(-1) or 35 mAh g(-1) in galvanostatic chronopotentiometry at 1 or 2C rates, respectively. Hence, our novel low temperature solid state route with subsequent mechanical disintegration represents energy saving pathway towards promising anode materials for fast and stable Li-ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

—

Svazek periodika

265

Číslo periodika v rámci svazku

MAR 2018

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

480-487

Kód UT WoS článku

000425751600053

EID výsledku v databázi Scopus

2-s2.0-85041453395