27th October 2022

Sodium-ion batteries could be a lower-cost alternative to Li-ion batteries, if ways are found to prevent the large sodium ions destroying their electrodes as they shuttle back and forth.
As a possible sodium-ion anode for such batteries, materials scientists at Qingdao University have used titanium dioxide and graphite to produce a stable structure, unchanged after 2,000 cycles.
“The researchers found that the battery exhibited a reversible specific capacity of 228mAh/g at a current density of 0.05A/g, with 100% capacity retention after 2000 cycles at 1A/g,” according to the university. “A full coin cell assembled with Na3V2(PO4)3 as the cathode delivered an energy density of 220Wh/kg.”
As a raw material, the team picked a form of TiO2 known as ‘anatase’, whose crystalline structure is porous to Na+ ions due to the presence of two-dimensional channels.
However, according to Qingdao professor Xiu Song Zhao, anatase has poor electron conductivity, and the ion diffusion rate could be better.
The answer, common to most of battery electrode construction, is to increase the relative surface area of the material by using microscopic particles, held robustly in a highly porous conductive matrix.
Zhao’s approach to this end was to exploit sol-gel chemistry to synthesise spongy, thermally-stable anatase covered with carbon.
Thermal stability is important here, as temperature is something that can change the crystal structure of anatase into other forms of TiO2 less able to store sodium ions. The Qingdao team said that its anode material is stable up to 750°C.
“This work prepared anatase with a special structure to improve the electron conductivity and ion diffusion kinetics,” Zhao said. It “provides a method for synthesising high performance titanium dioxide-based anode materials and ideas for studying the storage mechanism of the anatase.”
The work is described in ‘Sodium-Ion Storage Properties of Thermally Stable Anatase‘, published in Energy Material Advances.
Tagged with:
Your email address will not be published. Required fields are marked *

*
*





Download the Elektra Awards 2022 media pack and book your sponsorship package to be part of the most prestigious awards event celebrating its 20th anniversary this year!
Get the media pack »
Get our news, blogs and comments straight to your inbox! Sign up for the Electronics Weekly newsletters: Mannerisms, Gadget Master and the Daily and Weekly roundups.

Find out more »
Read our special supplement celebrating 60 years of Electronics Weekly and looking ahead to the future of the industry.
Read the Electronics Weekly @ 60 supplement »

Read the first ever Electronics Weekly online: 7th September 1960. We’ve scanned the very first edition so you can enjoy it.
Read the very first edition »
Electronics Weekly teams up with RS Grass Roots to highlight the brightest young electronic engineers in the UK today.

Find out more »
Read our special supplement celebrating 60 years of Electronics Weekly and looking ahead to the future of the industry.
Read the Electronics Weekly @ 60 supplement »

Read the first ever Electronics Weekly online: 7th September 1960. We’ve scanned the very first edition so you can enjoy it.
Read the very first edition »
View All Events
Tune into this Xilinx interview: Responding to platform-based embedded design
Listen to the interview »

Tune into this podcast to hear from Chetan Khona (Director Industrial, Vision, Healthcare & Sciences at Xilinx) about how Xilinx and the semiconductor industry is responding to customer demands.
Listen to the interview »
By using this website you are consenting to the use of cookies. Electronics Weekly is owned by Metropolis International Group Limited, a member of the Metropolis Group; you can view our privacy and cookies policy here.

source