The whole world is going through a severe climate change, even breaking the highest temperature record in history. The concentration of carbon dioxide measured in Hawaii at a high altitude is now above 407ppm.

The United States Government has announced a supporting policy that highly induces photovoltaic (PV) energy usage among the whole land. The government has set up a goal to have 1 giga-watt per PV amount for low-income houses built with federal government subsidies by 2020. This goal has been increased to 10 times of what the president Obama initially tried to build for ‘The Climate Action Plan’. The reasons that are strongly urging this plan is to decrease the energy levels of low-income households and to increase the number of available jobs.

And it’s not just the U.S. The whole world has reached the record of increasing the total amount of bioenergy by 147 GW in 2015. 173 nations have determined the initial goal amounts of bioenergy, and 146 nations are currently executing the terms of the bioenergy supporting policy. The bioenergy is now economically efficient enough to compete with fossil fuel, and Germany has set up goals to have over 50% of total power production to come from bioenergy. The current plan is to increase the PV generating unit by 6~7 GW through replacing old equipment and other steps.

Even though Germany usually has less sunshine than Korea because of its lower latitude, the PV generating unit reaches almost 35% of its total output during sunny weekdays and 50% during weekends. Germany is a sunlight generating country, with a 40 GW PV generating unit and a 1.5 million PV generating unit within its limits, based on records from late 2015.

It is now a trend to make ‘100% bioenergy’-run cities, communities, and companies all over the world. Developed countries are not the only ones trying to strengthen financial support for establishing ‘bioenergy’ supplies, overcome their energy security initiative and current environmental problems; developing countries also are working towards addressing these issues. An interesting point about this trend is the associated time period of inexpensive fossil fuel.

Reasons for Solar Energy Becoming Popular

The two types of bioenergy that could be applicable for commercial use are wind energy and solar energy. Wind energy should be used in an area with wind speed that is at least 5~6m/sec, and because of noise pollution, wind energy tends to be used in offshore wind parks.

However, since building solar energy outlets is not costly and is able to be installed on any type of land, it is rapidly spreading.

A solar battery that is commonly used is the PN junction, an N-type semiconductor that spreads phosphorus, superimposed on P-type semiconductors with boron added to high-silicon single crystal. When the sun shines on the solar battery, the electron can freely move through its intended opening by the energy that sun possesses. The electron then leans on the surface of the N-type semiconductor and the hole on the P-type semiconductor. Therefore, the voltage differentiation from the upper and lower surfaces of the solar battery creates an electric current. Then, the accumulated current turns into electricity.

The PV generating unit continues to work by generating electricity until the sun shines, so future produced energy will be developed into solar energy, which produces the infinite resource.

There are already more cases regarding 100 kilo-watt electricity sources being produced by installing PV panels on available spaces, such as large parking lots, reclaimed land, or the roofs of factories. For detached houses, 3kW electricity can be produced on the roof, and apartments can produce 250~500W of electricity using the lower space of windows near back porches.

In the future, if Energy Storage System (ESS) and PV-developing districts can be combined, some sources of thermal and nuclear power could be replaced because a new stable electric power supply will be available without a constant amount of sunlight generation.

Outstanding Steel Technology Needed for Creation of Sunlight Generating Unit

Boryung Dam Water Solar Power Plants constructed from PosMAC, a corrosion-resistant alloy from POSCO.

The life of PV generating units that produce solar energy is around 25~30 years. Therefore, the durability of the equipment is very important. The costs of PV generating units can be divided between solar modules, solar inverters, unit structures and construction. The solar module and inverter makes up 50% of the cost, and the construction fee makes up for the remaining 50%.

The most important part of solar modules is their effectiveness. A module produced from high-silicon single crystal should be selected, and the rated output within 12 years will be 90%, while the rated output within 25 years will be 80%. The construction should be able to withstand the load and stress from severe natural disasters, including rapid temperature change or storms, and should not deteriorate or corrode even with long-time exposure to the sun.

The strongest construction of solar power plants uses weatherproof and corrosion-resistant surface preparation steel sheets. POSCO, especially, is lowering the cost of construction by developing various steel machinery and fixtures to create PV panels more easily. Solar generating units can build their competitiveness as a future energy source with the support of outstanding steel technology.

Written by science technology columnist Dr. Junjeong Lee

The opinions expressed in this POSCO Report piece are the author’s own and do not necessarily reflect the views of POSCO.

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Today, we are living in a world of amazing products and technologies that go beyond our wildest imaginations. New things that alarm us pop up every other day, and it’s really a difficult task to keep up with all the latest trends. To help our readers out, Hello, POSCO prepared some of today’s most promising trends from secondary batteries to unmeltable steel. How about taking a glance into tomorrow’s technology together? 

A look into today’s leading trends in the advanced materials and energy industry

Thanks to the high enthusiasm and active investment on the part of POSCO and various companies in developing new business opportunities, Korea’s technology is making its way to the top.

Shall we take a closer look into Korea’s globally recognized advanced materials and energy sector?

#1. Secondary Batteries

Secondary batteries are known as one of the three most significant electronics of the 21st century, along with semiconductors and digital displays. Secondary batteries can be recharged and reused unlike the generic disposable kind. Corresponding to the rising interest in eco-friendly energy such as electric cars, the lithium secondary battery market soared 20% annually over the past five years.

According to a report by B3, a Japanese market research company, this year’s lithium ion secondary battery market is expected to increase 24% compared to last year.

Secondary batteries are classified by the material used; there are Nickel, lithium ion, lithium polymer, and nickel zinc batteries. Among these, the most promising is the lithium ion secondary battery which is widely used in various appliances including mobile electronic devices.

The Advantages of Environment-Friendly Secondary Batteries

 The most important reason secondary batteries are so influential in today’s energy industry is that its impact on the environment is minimal. Unlike fossil fuel, secondary batteries do not produce harmful emissions, making it an attractive energy source for cars. Also, because it does not require an internal combustion engine, there is no need to worry about making too much noise. Isn’t that wonderful?

From Automobiles to IT: The Various Applications of Secondary Batteries

Secondary batteries are thrown into the spotlight as the key to eco-friendly growth in various fields such as the automobile, IT and energy industries.

 From various IT devices to electric cars, secondary batteries are being used more and more frequently. Recently, secondary batteries are mostly used in mobile phones because they are light and suitable for storing high amounts of power.

In the automobile industry, the development and implementation of next-generation secondary batteries for electric cars will be a truly significant feat that will change the industry forever.

Game Changer: POSCO develops revolutionary lithium extraction technology

Korea is the world’s largest manufacturer of secondary batteries, but it has also been 100% dependent on imports for the core material lithium. To solve this problem, POSCO and the Research Institute of Industrial Science & Technology (RIST) jointly developed a revolutionary lithium extraction technology.

(POSCO’s Pilot Plant (Phase 2) located at the Maricunga project near the city of Copiapó, Chile)

The lithium extraction technology was developed after the successful installment of a pilot plant (phase 2) located at the Maricunga project near the city of Copiapó, Chile.

The chemical lithium extraction technology, which was developed by POSCO’s own research unit, reduces recovery time from around 12 months to just eight hours! It also increases the lithium recovery rate from a maximum of 30% using traditional evaporation ponds to more than 80%.

In a time when secondary batteries are in the limelight, POSCO’s new technology could possibly be a game changer in various next-generation industries such as electric cars and smart grids. We hope to lead the global green industry with this awesome technology!

#2. PosMAC, the Unmeltable Steel

(The demand for highly durable and cost-efficient PosMAC is on the rise in the solar panel industry)

We usually consider steel as vulnerable to rust and corrosion over time. However, Korea’s leading steelmaker POSCO has developed a revolutionary steel by the name PosMAC. PosMAC is free from rust and corrosion for 10 to even 50 years!

The researchers at POSCO felt the need to develop a highly durable steel suitable for use in sites vulnerable to corrosion such as livestock handling facilities or coastal structures. The result was a futuristic multi-purpose steel that not only ensured long-term stability, but also added to the cleanliness and aesthetic of structures.

PosMAC is highly durable to moisture, heat and various chemicals while being affordable. PosMAC is also highly resistant to alkali and ammonia, which makes it highly suitable for use in livestock handling facilities or in situations where components are in contact with concrete tar.

We expect the corrosion-free PosMAC to be a significant contribution to the steel market in areas struggling with rusty steel!

More information on PosMAC at Hello, POSCO Blog

• PosMAC: The Revolutionary Steel 

#3. Substituting Fossil Fuel with Marine Bioenergy

Last but not least is the marine bioenergy industry. Marine bioenergy is an alternative energy produced through the refinement and fermentation of marine biomass such as seaweed. By substituting fossil fuel, bioenergy aims to narrow the gap between energy supply and demand!

Korea is currently heavily dependent on imports for energy, with 97% of the country’s energy being imported. Thus, it is crucial to reduce the dependency while finding out a way to produce energy independently. Marine bioenergy has been thrown into the spotlight as a promising new alternative energy due to Korea’s geography being suitable for development.

The advantages of marine bioenergy is that there is no need to worry about depletion. Also, it can be used continuously once developed, and large-scale development is possible. Lastly, its impact on the environment is minimal. It will be great if Korea would be able to utilize its geographical advantage as a peninsula and develop the environment-friendly alternative energy in the future!