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NEC Develops Advanced Lithium Ion Battery with High-Energy Density
Oct 1, 2013

NEC Corporation
Tanaka Chemical Corporation

NEC Corporation (NEC), Tanaka Chemical Corporation and SEKISUI CHEMICAL CO., LTD. have cooperated with the National Institute of Advanced Industrial Science and Technology (AIST) to complete development on an advanced lithium ion battery that uses an Iron (Fe)-substituted manganese oxide cathode.

This newly developed lithium ion battery provides an energy density of 271Wh/kg, approximately 1.7 times that of lithium batteries with a spinel lithium manganese oxide cathode (*1) presently in commercial use.  This lithium ion battery technology is expected to offer a range of benefits, including lower lithium battery costs, increased driving range for electric vehicles and more light-weight and compact stationary storage systems.

This new technology is the result of research and development activities supported by the "Advanced Technology Research Project for the Application and Commercial Use of Lithium-Ion Batteries" being conducted by Japan's New Energy and Industrial Technology Development Organization (NEDO).

Primary features of the newly developed lithium ion battery include the following:


Increased cathode capacity through the development of a new Fe-substituted manganese oxide


NEC collaborated with Tanaka Chemical Corporation and AIST to develop a new lithium-iron-nickel-manganese oxide with a layered rock-salt structure (*2). A unique synthesis method that uses low-cost lithium carbonate was established to successfully achieve production on a kilogram scale. This cathode material demonstrates a large capacity of 247mAh/g, approximately 2.2 times that of conventional spinel lithium manganese oxide presently in use (110mAh/g capacity). (*3)




Development of a new anode and electrolyte to be compatible with the Fe-substituted manganese oxide for improved performance


NEC has developed a new silicon oxide anode that uses carbon nanohorns (*4) as a conductive agent to fully exhibit the performance of the Fe-substituted manganese oxide cathode material. The newly developed anode is optimized for large capacity cathodes, which contributes to a higher energy density.

In a joint project with SEKISUI CHEMICAL CO., LTD., NEC has also developed a new electrolyte including fluorinated ether for improved tolerance to high voltages. This electrolyte shows improved stability when charging the lithium ion battery up to 4.5V. 




Verified high energy density in 8Ah- laminated batteries


NEC produced prototype 8Ah laminated batteries using a Fe-substituted manganese oxide cathode, silicon oxide anode and a high voltage-tolerant electrolyte. The prototype demonstrated an energy density of 271 Wh/kg, approximately 1.7 times that of lithium batteries with a spinel lithium manganese oxide cathode.

NEC, Tanaka Chemical Corporation and SEKISUI CHEMICAL CO., LTD. will continue to drive further research and development in support of greater reliability and safety for these newly developed batteries in preparation for commercialization in 2020.

NEC plans to announce the results of this research and development project at the "54th Battery Symposium in Japan" to be held in Osaka from October 7, 2013.





NEC Corporation: President Nobuhiro Endo


Tanaka Chemical Corporation: Representative Director, President Tamotsu Tanaka


SEKISUI CHEMICAL CO., LTD.: President Naofumi Negishi  



(*1) Based on NEC's lithium ion batteries of 159 Wh/kg in energy density for stationary storage systems and electric vehicles.

(*2) A layered rock-salt oxide of Li1.23Fe0.15Ni0.15Mn0.46O2(0.2LiFeO2・0.2LiNiO2・0.6Li2MnO3).

(*3) Lithiated capacity per 1g of the Fe-substituted manganese oxide, which was evaluated by a Li half-cell performed under 2.0-4.8V. 

(*4) Carbon nanohorn  http://www.nec.com/en/press/201301/global_20130129_02.htmllink


Press Contact

Corporate Communication Department, Public Relations Group


This press release may contain forward-looking statements. Such forward-looking statements are based on current expectations and beliefs and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements due to changes in global economic, business, competitive market and regulatory factors.
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