Nav: Home

Pressure helps to make better Li-ion batteries

November 13, 2018

Rechargeable Li-ion batteries are crucial parts for home electronics and portable devices such as cell phones and laptops. One can imagine how the life we have today would be like without cell phones and internet. Li-ion batteries (LIBs) are also growing in popularity for electric vehicle which can help to highly reduce the emission of CO2 and solve the serious greenhouse effect on the earth. All these demands call for superior Li-ion battery materials with better performance such as higher capacity, longer life time, lower cost, etc.

Lithium titanium oxide (Li4Ti5O12, LTO) spinel experiences negligible volume change during lithium insertion and extraction and is regarded as a "zero-strain" anode material for LIBs. Due to its great structural stability, LTO exhibits excellent cycling performance, making it a promising anode for LIBs in electrical vehicle and large-scale energy storage areas. However, LTO shows poor electronic and ionic conductivities, limiting its applications. Therefore, improving its conductivity becomes crucial.

In a recent research article published in the Beijing-based National Science Review, scientists at the Center for High Pressure Science and Technology Advanced Research, Institute of Geochemistry, and Institute of Physics of Chinese Academy of Sciences, and George Mason University, Carnegie Institution of Washington, and Argonne National Laboratory of USA present their results on the studies of phase stability and conductivity of LTO under high pressure. It was found that the LTO spinel structure starts to distort due to the significant difference in compressibility of the building blocks, LiO6 and TiO6 octahedra in LTO at low pressures. The strong highly distorted structure transforms into amorphous eventually as pressure over around 270 thousands times normal atmospheric pressure. Remarkably, the amorphous LTO can be decompressed down to ambient pressure and displays much better conductivity than crystalline LTO. "These findings may offer a new strategy for improving the conductivity of LTO anode in Li-ion batteries using a high-pressure technique." said Dr. Lin Wang, the corresponding author of the article.

To understand the significant enhancement of conductivity in the amorphous phase, the ionic transport properties of crystalline and amorphous LTO were investigated by first-principles molecular dynamics simulations. Theoretical calculations revealed that the amorphous phase induced by high pressure can highly promote Li+ diffusion and increase its ionic conductivity by providing ion migration defects. "All of these findings increase the understanding of the relationship between structure and conducting properties of LTO" Dr. Wang added.
-end-
This research received funding from National Natural Science Foundation of China, National Science Associated Funding, Science Challenging Program, the supports from Chinese Academy of Science, State Key Laboratory of Organic-Inorganic Composites, Fundamental Research Funds for the Central Universities and Beijing Advanced Innovation Center for Soft Matter Science and Engineering.

See the article:

Yanwei Huang, Yu He, Howard Sheng, Xia Lu, Haini Dong, Fengjiao Chen, Sudeshna Samanta, Hongliang Dong, Xifeng Li, Duck Young Kim, Ho-kwang Mao, Yuzi Liu, Heping Li, Hong Li and Lin Wang.

Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12

Natl Sci Rev 2018; doi: 10.1093/nsr/nwy122

https://doi.org/10.1093/nsr/nwy122

The National Science Review is the first comprehensive scholarly journal released in English in China that is aimed at linking the country's rapidly advancing community of scientists with the global frontiers of science and technology. The journal also aims to shine a worldwide spotlight on scientific research advances across China.

Science China Press

Related Cell Phones Articles:

New lithium batteries from used cell phones
Research from the University of Cordoba (Spain) and San Luis University (Argentina) was able to reuse graphite from cell phones to manufacture environmentally friendly batteries.
Thyroid cancer, genetic variations, cell phones linked in YSPH study
Radiation from cell phones is associated with higher rates of thyroid cancer among people with genetic variations in specific genes, a new study led by the Yale School of Public Health finds.
Dissemination of pathogenic bacteria by university student's cell phones
New research has demonstrated the presence of S. aureus in 40% of the cell phones of students sampled at a university.
'Technoference': We're more tired & less productive because of our phones
An Australian survey of 709 mobile phone users (aged 18 to 83), led by Queensland University of Technology, has found one in five women and one in eight men are losing sleep due to bad phone habits.
Research could lead to more durable cell phones and power lines
Researchers from Binghamton University, State University of New York have developed a way to make cell phones and power lines more durable. 
Cell phones without annual plans offer limited help to homeless people
The vast majority of older homeless adults have access to mobile phones, but they are usually basic phones, without annual contracts that let them keep stable numbers, and thus are only practical for one-way communication, according to a UC San Francisco study of how homeless people use mobile and Internet technology.
Laws designed to ban or curb drivers' use of cell phones are saving motorcyclists' lives
Laws to ban or curb drivers' use of cell phones and other handheld devices have greatly reduced the rate of fatalities for motorcyclists, according to a new study from Florida Atlantic University and the University of Miami.
Toxic chemicals calling: Cell phones as a source of flame retardants
New research by environmental scientists at the University of Toronto suggests that the exterior of mobile phones could be a source of toxic chemicals, or at least an aggregate indicator of the chemicals to which people are exposed on a daily basis.
About half of parents use cell phones while driving with young children in the car
A new study from a team of researchers at Children's Hospital of Philadelphia and the University of Pennsylvania School of Nursing found that in the previous three months, about half of parents talked on a cell phone while driving when their children between the ages of 4 and 10 were in the car, while one in three read text messages and one in seven used social media.
Ultrasound-firewall for mobile phones
Mobile phones and tablets through so-called audio tracking, can be used by means of ultrasound to unnoticeably track the behaviour of their users: for example, viewing certain videos or staying in specific rooms and places.
More Cell Phones News and Cell Phones Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Climate Mindset
In the past few months, human beings have come together to fight a global threat. This hour, TED speakers explore how our response can be the catalyst to fight another global crisis: climate change. Guests include political strategist Tom Rivett-Carnac, diplomat Christiana Figueres, climate justice activist Xiye Bastida, and writer, illustrator, and artist Oliver Jeffers.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Speedy Beet
There are few musical moments more well-worn than the first four notes of Beethoven's Fifth Symphony. But in this short, we find out that Beethoven might have made a last-ditch effort to keep his music from ever feeling familiar, to keep pushing his listeners to a kind of psychological limit. Big thanks to our Brooklyn Philharmonic musicians: Deborah Buck and Suzy Perelman on violin, Arash Amini on cello, and Ah Ling Neu on viola. And check out The First Four Notes, Matthew Guerrieri's book on Beethoven's Fifth. Support Radiolab today at Radiolab.org/donate.