Welcome!

News Feed Item

Fujitsu Develops High-Voltage Cathode Material for Lithium Iron Phosphate Rechargeable Batteries



Enables production of low-cost, cobalt-free lithium rechargeable batteries

Figure 1: Crystal structure of the new material

Figure 2: Prototype coin-shaped battery

Figure 3: Voltage and discharge depth(2) of the prototype coin battery

KAWASAKI, Japan, May 29, 2017 - (JCN Newswire) - Fujitsu Laboratories Ltd. today announced that it has successfully developed a cathode material for lithium iron phosphate rechargeable batteries. This new material offers high voltage that could only be achieved by cobalt-based materials in the past.

Currently, the rare metal cobalt is a component of cathodes in high capacity and high-voltage lithium rechargeable batteries for electric vehicles (EVs) and home storage batteries. As these devices become more popular, there are concerns regarding future shortages of cobalt used in rechargeable lithium-ion batteries. Significant cost increases are also expected, generating interest in abundant and cheap iron to replace cobalt as the constituent element in rechargeable batteries. However, iron could not offer voltage comparable to that of cobalt-based materials.

Now Fujitsu Laboratories has discovered a new factor that can improve the voltage of iron-based materials. Using a proprietary materials design technology as well as a technology that precisely controls the composition of raw materials and the formation process of materials, Fujitsu Laboratories has successfully synthesized lithium iron pyrophosphate (Li5.33Fe5.33(P2O7)4). This phosphate-based material has a voltage of 3.8 V, comparable to that of existing cobalt-based materials.

In the future, Fujitsu Laboratories will seek to improve the performance of cathodes using this newly developed iron-based material. By advancing the design of new crystal structures that can maintain a high voltage state for longer periods, Fujitsu Laboratories aims to develop cathode materials that offer high energy density comparable to cobalt-based materials. In this way, Fujitsu Laboratories will contribute to lowering the cost of lithium rechargeable batteries and the devices that use them.

Details are being announced at the 231st ECS Meeting, an international conference on electrochemistry, currently underway in New Orleans, U.S., from May 28 to June 1.

Development Background

Currently, lithium-ion batteries are widely used as high-performance rechargeable batteries. However, there are concerns about insufficient supply and rising costs, as the batteries' cathode materials contain the rare metal cobalt, such as lithium cobalt oxide (LiCoO2). Large volumes of lithium-ion batteries will be required in the future for electric vehicles in order to achieve a low-carbon society that does not rely on fossil fuels and emit greenhouse gasses in the age of global warming. Consequently there has been a great deal of interest in developing materials that use iron, which is abundant on earth, as a constituent element in place of cobalt.

Issues

Previously, there was a problem with lithium-ion batteries using iron-based materials as they could not reach the energy density of those using cobalt-based materials. Energy density is expressed as a product of capacity density and voltage. Accordingly, iron-based materials with voltage of 2.8 V to 3.5 V could not compete with cobalt-based materials whose voltage ranged from 3.75 V to 4.1 V. It is known that the voltage of cathode materials can change depending on the arrangement of atoms in the crystal structure, which created issues in the development of new iron-based materials with high voltage.

About the Newly Developed Technology

Now, by analyzing the correlation between the crystal structure of iron-based materials and their electrochemical characteristics, Fujitsu Laboratories has discovered new factors in improving the voltage of iron-based materials. Using a proprietary materials design technology and a technology that precisely controls the composition of raw materials and the formation process of materials, the corporation has successfully synthesized lithium iron pyrophosphate (Li5.33Fe5.33(P2O7)4). This phosphate-based material has a voltage of 3.8 V, comparable to that of existing cobalt-based materials.

Details of the newly developed technology are as follows:

1. Discovered new factors improving the voltage of iron-based materials

The voltage of cathode materials is significantly influenced by the coordination of elements such as iron and oxygen in the crystal. By analyzing the interrelationship between the crystal structure of a material and its electrochemical characteristics, Fujitsu Laboratories discovered new factors in improving the voltage of iron-based cathode materials. In fact, it was discovered that a distorted arrangement of oxygen atoms around iron atoms is one of critical factors for the high voltage.

2. Successfully developed iron-based materials with high voltage comparable to cobalt-based materials

Using a proprietary Fujitsu Laboratories technology that precisely controls the coordination of raw materials and the formation of the material, Fujitsu Laboratories succeeded in synthesizing lithium iron pyrophosphate (Li5.33Fe5.33(P2O7)4), a new iron phosphate-based material (Figure 1). Fujitsu Laboratories created a coin-shaped prototype battery (Figure 2) and based on the results of its electrochemical properties evaluation, it was confirmed that it could achieve a voltage of 3.8 V, comparable to that of existing cobalt-based materials. This material has an even higher voltage than previously developed iron phosphate-based materials, represented by lithium iron phosphate (LiFePO4) (Figure 3).

The charge capacity of the prototype coin battery is about 105 mAh/g(1), which accounts for approximately 75% of the theoretical value of 139 mAh/g (Li5.33Fe5.33(P2O7)4), or the actual value of 137 mAh/g (LiCoO2). Through continued analysis, Fujitsu Laboratories plans to further improve such figures.

http://www.acnnewswire.com/topimg/Low_FujitsuCathodeMaterialFig1.JPG
Figure 1: Crystal structure of the new material

http://www.acnnewswire.com/topimg/Low_FujitsuCathodeMaterialFig2.JPG
Figure 2: Prototype coin-shaped battery

http://www.acnnewswire.com/topimg/Low_FujitsuCathodeMaterialFig3.JPG
Figure 3: Voltage and discharge depth (*2) of the prototype coin battery

Results

The newly-developed cathode material has not reached a voltage equal to existing cobalt-based materials in terms of energy density. Nonetheless, it has paved the way to increase the voltage of iron-based materials, resolving a roadblock in the research development.

In addition, cobalt-based cathode materials are used in lithium-ion batteries for electric vehicles as well as devices such as smartphones and digital cameras. If a cathode material is developed with the same energy density as cobalt-based materials, this will enable the stable production of cathode materials by replacing the rare metal cobalt with abundant iron. Moreover, this is expected to contribute to the stable production of lithium-ion batteries and the devices which use them, such as electric vehicles.

Future Plans

Based on this cathode development, Fujitsu Laboratories will work to design a crystal structure that can maintain a voltage on par with cobalt-based materials for longer periods. The electrode can also be used as a low-cost cathode material in safe, solid-state rechargeable batteries. Fujitsu Laboratories will contribute to a more sustainable and comfortable society by developing next-generation high-energy-density rechargeable batteries that are safer, cheaper and environmentally friendly.

(1) mAh/g
An expression of capacity density per one gram of cathode material, this is the electrical current required when it is assumed that it will take one hour for a battery to completely discharge from a fully charged state.
(2) Discharge depth
The percentage of a battery's capacity discharged from its fully charged state at 100%

About Fujitsu Laboratories

Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu Laboratories Ltd. is one of the premier research centers in the world. With a global network of laboratories in Japan, China, the United States and Europe, the organization conducts a wide range of basic and applied research in the areas of Next-generation Services, Computer Servers, Networks, Electronic Devices and Advanced Materials. For more information, please see: http://www.fujitsu.com/jp/group/labs/en/.

About Fujitsu Ltd

Fujitsu is the leading Japanese information and communication technology (ICT) company, offering a full range of technology products, solutions, and services. Approximately 159,000 Fujitsu people support customers in more than 100 countries. We use our experience and the power of ICT to shape the future of society with our customers. Fujitsu Limited (TSE:6702; ADR:FJTSY) reported consolidated revenues of 4.7 trillion yen (US$41 billion) for the fiscal year ended March 31, 2016. For more information, please see http://www.fujitsu.com.

* Please see this press release, with images, at:
http://www.fujitsu.com/global/about/resources/news/press-releases/

Source: Fujitsu Ltd

Contact:
Fujitsu Laboratories Ltd.
Devices & Materials Laboratory
E-mail: [email protected]

Fujitsu Limited
Public and Investor Relations
Tel: +81-3-3215-5259
URL: www.fujitsu.com/global/news/contacts/




Copyright 2017 JCN Newswire . All rights reserved.

More Stories By ACN Newswire

Copyright 2008 ACN Newswire. All rights reserved. Republication or redistribution of ACN Newswire content is expressly prohibited without the prior written consent of ACN Newswire. ACN Newswire shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon.

Latest Stories
"MobiDev is a Ukraine-based software development company. We do mobile development, and we're specialists in that. But we do full stack software development for entrepreneurs, for emerging companies, and for enterprise ventures," explained Alan Winters, U.S. Head of Business Development at MobiDev, in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
What's the role of an IT self-service portal when you get to continuous delivery and Infrastructure as Code? This general session showed how to create the continuous delivery culture and eight accelerators for leading the change. Don Demcsak is a DevOps and Cloud Native Modernization Principal for Dell EMC based out of New Jersey. He is a former, long time, Microsoft Most Valuable Professional, specializing in building and architecting Application Delivery Pipelines for hybrid legacy, and cloud ...
With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend 21st Cloud Expo October 31 - November 2, 2017, at the Santa Clara Convention Center, CA, and June 12-14, 2018, at the Javits Center in New York City, NY, and learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.
SYS-CON Events announced today that Cloud Academy named "Bronze Sponsor" of 21st International Cloud Expo which will take place October 31 - November 2, 2017 at the Santa Clara Convention Center in Santa Clara, CA. Cloud Academy is the industry’s most innovative, vendor-neutral cloud technology training platform. Cloud Academy provides continuous learning solutions for individuals and enterprise teams for Amazon Web Services, Microsoft Azure, Google Cloud Platform, and the most popular cloud com...
21st International Cloud Expo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Me...
SYS-CON Events announced today that TechTarget has been named “Media Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. TechTarget storage websites are the best online information resource for news, tips and expert advice for the storage, backup and disaster recovery markets.
You know you need the cloud, but you’re hesitant to simply dump everything at Amazon since you know that not all workloads are suitable for cloud. You know that you want the kind of ease of use and scalability that you get with public cloud, but your applications are architected in a way that makes the public cloud a non-starter. You’re looking at private cloud solutions based on hyperconverged infrastructure, but you’re concerned with the limits inherent in those technologies.
DevOps at Cloud Expo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 21st Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to w...
"Tintri focuses on the Ops side of the DevOps, which basically is pushing more and more of the accessibility of the infrastructure to the developers and trying to get behind the scenes," explained Dhiraj Sehgal of Tintri in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
"We focus on composable infrastructure. Composable infrastructure has been named by companies like Gartner as the evolution of the IT infrastructure where everything is now driven by software," explained Bruno Andrade, CEO and Founder of HTBase, in this SYS-CON.tv interview at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
SYS-CON Events announced today that CA Technologies has been named "Platinum Sponsor" of SYS-CON's 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business - from apparel to energy - is being rewritten by software. From planning to development to management to security, CA creates software that fuels transformation for companies in the applic...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
Hardware virtualization and cloud computing allowed us to increase resource utilization and increase our flexibility to respond to business demand. Docker Containers are the next quantum leap - Are they?! Databases always represented an additional set of challenges unique to running workloads requiring a maximum of I/O, network, CPU resources combined with data locality.
The current age of digital transformation means that IT organizations must adapt their toolset to cover all digital experiences, beyond just the end users’. Today’s businesses can no longer focus solely on the digital interactions they manage with employees or customers; they must now contend with non-traditional factors. Whether it's the power of brand to make or break a company, the need to monitor across all locations 24/7, or the ability to proactively resolve issues, companies must adapt to...
Cloud Expo, Inc. has announced today that Andi Mann and Aruna Ravichandran have been named Co-Chairs of @DevOpsSummit at Cloud Expo Silicon Valley which will take place Oct. 31-Nov. 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. "DevOps is at the intersection of technology and business-optimizing tools, organizations and processes to bring measurable improvements in productivity and profitability," said Aruna Ravichandran, vice president, DevOps product and solutions marketing...