News of Batteries: Lithium-ion battery will to be leap forward

Lithium-ion battery will to be leap forward

2009 lithium-ion battery to leap forward (IV): a substantial increase in the safety performance of positive

Audi offers the Sanyo batteries

Sanyo Electric Co. supplies batteries to the Audi's performance. Power density up to 3500W/kg, life expectancy more than 10 years.

While other vendors are convoluted, but Sanyo Electric, GS Yuasa, and Toshiba is rolled into the square enclosure of the electrode. While Nissan will put into the cylindrical housing. However, Hitachi is also exploring the multi-layer type in the square not considered.

Sanyo Electric in May 2008 announced it will supply Audi's HEV batteries, but also open the HEV and PHEV battery cells and modules used in the sample. Audi supplies the battery, the power density of the 3500W/kg, the energy density of the 90Wh/kg. Voltage and capacity has not been announced, it is estimated voltage of about 3.6V, capacity 5Ah so.

Used in the cathode in the LiNiCoMnO2 (hereinafter referred to as 3 per class) based on self-improvement materials, using a variety of materials, a variety of performance comparison. In comparison, in addition to class Co, Mn classes, 3 per type of material, but also use LiNiCoAlO2 (hereinafter referred to as Ni type), LiFePO4 (hereinafter referred to as iron phosphate class), security of more outstanding in terms of Mn, Ni classes terms of capacity more excellent, 3 per class is more balanced in all aspects.

Sanyo Electric plans to complete in March 2009 product line, established from the end of 2009 to 15,000 per year ~ 20 000 mass-produced HEV battery supply system. Import in 2010 will be the second production line, so that the battery unit per month to 100 million, and strive to achieve by 2015 to produce 10 million. Typically, each general use of HEV battery cells 30 to 100, if the battery shipped 10 million units, the equivalent of 100,000 ~ 330,000 / month HEV. In addition, the company also plans to use trial 20Ah PHEV battery level, and strive to mass production in 2011.

Comparison of cathode material. Sanyo Electric to compare the materials of the company's example. In terms of safety, Mn, Class 3, Class metaclass and excellent iron phosphate.

Mitsubishi Electric to supply batteries are Mitsubishi, Mitsubishi, GS Yuasa of the tripartite joint venture LEJ. But for HEV, PHEV GS Yuasa battery was developed separately.

These batteries are used square. LEJ will be EV supply "LEV50", its capacity up to 50Ah. Voltage of 3.7V, external dimensions of 43.8 × 171 × 112mm. Series 4 will be the way the battery into a module equipped with the iMiEV 88. Cathode material and the AESC as are Mn-based class.

HEV battery used "EH6", is developing voltage of 3.7V, a capacity 6Ah products. 3600W/kg more power density and energy density 67.1kW/kg, cathode material selection is 3 per class.

Both Mn 3 per class or classes, as the cathode material security are very high, while GS Yuasa is developing a more secure type of material iron phosphate. Iron phosphate type with high safety, long service life, but when used as the cathode material, there is the battery voltage of only 3.2 ~ 3.3V shortcomings.

In addition, there is iron phosphate type conductivity over a large current discharge rate to decrease when the capacity problem. The company attached to the carbon on the cathode to improve the conductivity. A successful trial in the 400A high current flow can be achieved when the battery capacity of 50Ah.

Hitachi Vehicle Energy is improving the safety of cathode. Although not disclose the specific materials, but the products have been used in the development of class materials have Mn. Isuzu Motors after the company had the "Elf" and the Rotary Shankar Mitsubishi buses "Canter" provided such hybrid batteries, built in 2004 voted to produce 40,000 battery production line is currently at full capacity.

The company is committed to elimination of production in the battery unit deviation in performance. If there is a deviation voltage of the battery cell, part of the battery unit will bear the load, making the battery deterioration accelerated. Therefore, the company in addition to the assembly, the process of evaluation, inspection and production equipment to conduct a thorough improvements, still design feedback, clean room were improved.

Hitachi Vehicle Energy, said, "from 3,4 years ago with General Motors launched a joint research" (Hitachi Vehicle Energy director Hidetaka Kawamoto), have been identified since 2010 to supply batteries for GM's HEV program. In order to carry supplies for, Hitachi Vehicle Energy in December 2008 have been imported production equipment.

Toshiba to use lithium titanate anode

Cathode material in the direction of the high security process, Toshiba focused on negative materials, developed a new battery "SCiB". The company intended to achieve in 2009 on the application of electric bicycles, and plans used in automobiles from 2010. The battery has started in April 2008 Saku City plant for mass production. Battery cell production capacity of 150,000 per month.

In terms of safety, the company that led to rise in temperature is negative material. Now common in the negative and positive is the ability to obtain large potential difference between the graphite and amorphous carbon rod. However, the use of black stone, if, after a short circuit at full power, there will be negative and 200 ℃ 90 ℃ heat phenomenon. Toshiba used Li4Ti5O12 (lithium titanate) decreased this heating phenomenon.

Toshiba to use lithium titanate anode material, the development of short-circuit the battery in a high security set on the division's short 18mm square area in the crushed battery unit, if the cathode is made of lithium titanate, voltage not dramatically. The graphite anode, then the discharge will be about 1 second, the internal energy into heat.

However, when using this material weakness, as the battery cell voltage of only 2.4V, so compared with the graphite of about 3.6V, the need for more battery units. However, "no matter to what extent the use of SOC, the capacity will change, ordinary lithium-ion rechargeable battery is 30%, while the new battery you can use 60 to 80%, so the overall look or can reduce the weight" (Toshiba Power Industrial Systems distribution business of promoting the omnibus SCiB technical director of the Ministry of the multi-Kai III).