R&D

The new technology under development

CONNEXX SYSTEMS is not just an OEM manufacturer of storage batteries. We are committed to be a total solution provider for electric energy storage demands and provide “one stop” services including a design of electric energy storage systems, operation supports, and maintenance.

Hyper BatteryTM

A high-energy type energy storage device and a high power energy storage device are both essential for the effective use of electric energy. At present, a high power type energy storage device is limited to a capacitor. However, its energy density is about a one hundredth of a LiB battery. To filled the gap in the demand and in the technology, CONNEXX SYSTEMS has been developing a new electrochemical device called “Hyper BatteryTM” using new anode silicon carbon composite material (SCC) and a new cell architecture. The Hyper BatteryTM has a high charge/discharge rate comparable with capacitors, and its energy density is more than 20 times higher than capacitors.

The Hyper BatteryTM has the “True Stack structure” with multiple strip-shaped thin electrodes stacked up to minimize the battery electrical resistance and to swiftly dissipates heat when large electric power is used. In addition, the Hyper BatteryTM is a 12V battery housing 4 thin sheet-like cells in one single case.

With these characteristics, the Hyper BatteryTM is expected to be the next-generation battery, bringing technological innovations in the followings applications.

  • 48V-IS (Idle-stop) and HEV/PHEV Application

    The Hyper BatteryTM is capable of 50C pulse charge/discharge (Charge/Discharge Rate of complete charge-discharge within 72 seconds) and enables storage of regenerative electric power or rapid acceleration.

  • Leveling of Renewable Energy with the 2nd generation Bind BatteryTM

    Hyper BatteryTM can be used in combination with the Bind BatteryTM and add a feature of “large electric power absorbing performance” to the first generation Bind BatteryTM that has characteristics of “safe, simple, and highly reliable.” While there is a strong demand, the growth in the use of renewable energy sources such as solar power and hydropower is somewhat limited, because the electric power from these renewable sources fluctuates wildly in terms of seconds and also renders high power loads on the electric power supply system. The second generation Bind BatteryTM installed at a renewable energy power plant can help stabilize the power supply by absorbing and leveling off the fluctuating power from the renewable power sources.

Explanation about Shuttle BatteryTM

CONNEXX SYSTEMS has been developing the next generation ultra-high energy storage device called “Shuttle BatteryTM” using inexpensive and safe iron metal and air as the fuels. The system could provide the energy density comparable with fossil fuels. The Shuttle BatteryTM is a high temperature operating all-solid storage battery consisting of a solid oxide fuel cell (SOFC) component and an anode fuel compartment filled with iron powders. This innovative storage battery enables the high energy density of greater than 7000Wh/L (more than 14 times higher than present lithium ion batteries) with a large scale system.

The discharge mechanism of Shuttle BatteryTM is similar to that of SOFC. Hydrogen gas reacts with oxygen in the SOFC module and generate power. But instead of being released, water, that is the byproduct of the above reaction, is redirected to the anode compartment filled with iron powders and regenerate hydrogen by reaction with the iron. The iron itself becomes iron oxide by this reaction. The regenerated hydrogen reacts with oxygen again and generate more power. These reactions repeat until all the irons in the anode compartment are consumed. All of these reactions are reversible and thus charging can be done by reversing the directions of the reactions. Unlike the conventional SOFC or other fuel cells, it does not require continuous supply of hydrogen, thus eliminating expensive and unsafe hydrogen supply system at a devise level as well as at a supply side such as a hydrogen gas tank, hydrogen gas pipeline, and hydrogen gas station, resulting in drastic cost reduction including the social infrastructure investments for the hydrogen supply. As it uses inexpensive iron and free oxygen as the active materials, the cost of Shuttle BatteryTM itself can be kept extraordinarily low for its unexceptionally high energy. In addition, since the main materials of the Shuttle BatteryTM are non-inflammable (ceramic and iron) and the amount of hydrogen gas generated within the system is small, the Shuttle BatteryTM is intrinsically safe.

To prevent the agglomeration of the iron powders and the reduction of the surface area at the high operation temperature of Shuttle Battery, CONNEXX SYSTEMS has applied the special surface treatment to the iron powders and successfully improved the cycle characteristic (Patent No. 5210450).

The expected usage of Shuttle BatteryTM includes energy storage for electrical mobile devices, long-term and large-scale load leveling storage battery systems, EVs, E-Boats, E-Planes, off-grid energy source and high capacity energy storage for large scale renewable energy plants.

SCC Silicon-Carbon Composite Material

There are always demands for lithium ion batteries (LiB) with greater capacity in the portable electrical applications and automotive industries. The capacity of present LiBs that use carbon (graphite) as the anode material is now near the theoretical limitation and the development of new anode materials is essential for further increase of the energy density of the LIBs. To significantly increase the capacity of anode material, attention is now focused on silicon that has the capacity of 4200mAh/g, more than 10 times as much as graphite. A challenge of silicon anode material lies in its cycle characteristic. Although developments to improve the cycle characteristic are underway at universities, research institutes and enterprises throughout the world using high-performance materials such as graphene and silicon nanotubes, they in fact have little practicality mainly because of its production cost. CONNEXX SYSTEMS has established the technology to uniformly distribute nano-scale silicon particles through the conductive network that is made of carbon without using expensive materials and processes, and successfully developed an innovative anode material called “SCC (Silicon-Carbon Composite)” for the next generation LiBs. SCC attains both the significantly high capacity, greater than 1200mAh/g equivalent to more than 3 times as much as current anode materials, texcellent long life cycle and exceptionally low volume expansion (Patent No. 5227483). SCC has been developed as a part of “Strategic Foundational Technology Improvement Support Operation” of the Ministry of Economy, Trade and Industry and is now in the final stage of commercialization.

SCC has the superior life cycle performance and its capacity hardly deteriorates even after 150 cycles that is comparable with the present graphite anode material, having far greater life cycle performance than other silicon-based anode materials. In addition, the morphology of SCC is nearly the same as that of the present graphite anode materials providing the advantage of enabling the handling of SCC in the existing electrode process apparatus. That would make introduction of SCC to the existing LIB manufacturing line much easier.