Why Lithium Batteries Catch Fire

Why Lithium Batteries Catch Fire Lithium batteries are compact, lightweight batteries that hold considerable charge and fare well under constant discharge-recharge conditions. The batteries are found everywhere  -   in laptop computers, cameras, cell phones, and electric cars. Although accidents are rare, those that do occur may be spectacular, resulting in an explosion or fire. In order to understand why these batteries catch fire and how to minimize the risk of an accident, it helps to understand how the batteries function. How Lithium Batteries Work A lithium battery consists of two electrodes separated by an electrolyte. Typically, the batteries  transfer electrical charge from a lithium metal cathode  through an electrolyte consisting of an organic solvent containing lithium salts over to a carbon anode. The specifics depend on the battery, but lithium-ion batteries usually contain a metal coil and a flammable lithium-ion fluid. Tiny metal fragments float in the liquid. The contents of the battery are under pressure, so if a metal fragment punctures a partition that keeps the components separate or the battery is punctured, the lithium reacts with water in the air vigorously, generating high heat and sometimes producing a fire. Why Lithium Batteries Catch Fire or Explode Lithium batteries are made to deliver high output with minimal weight. Battery components are designed to be lightweight, which translates into thin partitions between cells and a thin outer covering. The partitions or coating are fairly fragile, so they can be punctured. If the battery is damaged, a short occurs. This spark can ignite the highly reactive lithium. Another possibility is that the battery can heat to the point of thermal runaway. Here, the heat of the contents exerts pressure on the battery, potentially producing an explosion. Minimize the Risk of Lithium Battery Fire The risk of fire or explosion increases if the battery is exposed to hot conditions or the battery or internal component is compromised. You can lessen the risk of an accident in several ways: Avoid storing at high temperatures. Dont keep batteries in hot vehicles. Dont allow a blanket to cover your laptop. Dont keep your cell phone in a warm pocket.  You get the idea.Avoid keeping all your items containing lithium-ion batteries together. When you travel, especially on a plane, youll have all your electronic items in one bag. This is unavoidable because the batteries have to be in your carry-on but usually, you can keep some space between battery-containing items. Although having lithium-ion batteries in close proximity does not increase the risk of a fire, if there is an accident, the other batteries can catch fire and make the situation worse.Avoid overcharging your batteries. These batteries do not suffer memory effect as badly as other types of rechargeable batteries, so they can be discharged and recharged many times nearly back to their original charge. However, they do not fare well if they are completely drained before recharging or are over-charged. Car chargers are notorious for overcharging batteries. Using any charger other than the one intended for the battery can increase the risk of damage.

Text Organization Guide for English Learners

Text Organization Guide for English Learners Text organization refers to how a text is organized to help readers follow and understand the information presented. There are a number of standard forms that help text organization when writing. This text organization guide will help you logically guide your readers through your text. Text Organization: Referring to Ideas Already Presented Pronouns and determiners are used to refer to ideas, points or opinions that you have previously introduced, or will immediately introduce. Here is a quick review of pronouns and determiners with examples. Pronouns Remember that ideas, opinions, and arguments are considered objects in English which take object pronouns. it / it / its - singularthey / them / their - plural Examples: Its importance can not be underestimated.It now becomes clear that their role in production is vital.The government has given it ample consideration but rejected its validity. Determiners this / that - singularthese / those - plural This is key: Children need to be encouraged in order to succeed.Jefferson referred to those as unnecessary complications. Make sure that pronouns and determiners are clearly defined either before, or immediately after their introduction in order to avoid confusion. Examples: The need for economic growth is vital to any society. Without it, societies become defensive and ... (it refers to need for economic growth)These are vital for any job: interest, skills, manners... (these refers to interest, skills, manners) Text Organization: Providing Additional Information A number of forms are used to provide additional information in text organization. These forms are used at the beginning of a sentence to link text to the previous sentence: In addition to X, ...As well as X, ... Examples: In addition to these resources, we will require a further investment of ...As well as his difficulties in childhood, his continuing poverty as a young adult caused many problems. These phrases can be used in the middle of a sentence or a phrase to provide additional information in your text organization: alsoas well as Examples: Our commitment to the cause, as well as our financial resources, will make this possible.There was also time considerations to take into account. Sentence Structure: Not only...but also The sentence structure Not only clause, but also clause is also used to provide additional information and emphasize the later point in your argument: Examples: Not only does he bring experience and expertise to the company, but he also has an outstanding reputation.Not only are the students improving scores, but they are also having more fun. NOTE: Remember that sentences beginning with Not only ... use inverted structure (Not only do they do...) Text Organization: Introducing a Number of Points Its common to use phrases to signify the fact that you will be making different points in your text. The simplest way to indicate that you will be touching on a number of different points is to use sequencers. The appearance of sequencers indicates that there are points to follow or that precede your sentence. For more information on sequencers, continue on to the section on sequencing your ideas for text organization. There are also some set phrases that point to the fact that there are a number of points to follow. Here are the most common: There are a number of ways / means / manners ...The first point to make is ...Lets begin with the assumption that / the idea that / the fact that ... Examples: There are a number of ways we can approach this problem. First, ...Lets begin with the assumption that all of our courses are necessary for our students. Other phrases are used to indicate that one phrase is related to another in an additional sense. These phrases are common in text organization: For one thing ...and another thing / and for another ...besides that ...and besides Examples: For one thing he doesnt even believe what hes saying...., and another thing is that our resources cant begin to meet the demand. Text Organization: Contrasting Information There are a number of ways to contrast information in text organization. In most cases, two clauses are used: one with the most important information, as well as a clause introduced with a word or phrase showing contrast. The most common of these are although, though, even though, but, yet and despite, in spite of. Although, Even Though, Though Notice how though, even though or although show a situation which is contrary to the main clause to express conflicting information. Even though, though and although are synonymous. Use a comma after beginning a sentence with although, even though, though. No comma is required if you finish the sentence with although, even though, though. Examples: Even though it was expensive, he bought the car.Though he loves doughnuts, he has given them up for his diet.Although his course was difficult, he passed with the highest marks. Whereas, While Whereas and while show clauses in direct opposition to each other. Notice that you should always use a comma with whereas and while. Examples: Whereas you have lots of time to do your homework, I have very little time indeed.Mary is rich, while I am poor. Whereas, While But and yet provide contrary information that is often unexpected. Notice that you should always use a comma with but and yet. Examples: He spends a lot of time on his computer, yet his grades are very high.The research pointed to a specific cause, but the results painted a very different picture. Text Organization: Showing Logical Connections and Relations Logical consequences and results are shown by beginning sentences with linking language indicating a connection to the previous sentence (or sentences). The most common of these include as a result, accordingly, thus, hence, consequently. Examples: As a result, all funding will be suspended until further review.Consequently, the most important elements combine to provide a rich tapestry effect. Text Organization: Sequencing Your Ideas In order to help your audience understand, you need to link ideas together in your text organization. One of the most important ways to link ideas is to sequence them. Sequencing refers to the order in which events happened. These are some of the most common ways to sequence in writing: Beginning: Firstly,First of all,To start off with,Initially, Examples: Firstly, I began my education in London.First of all, I opened the cupboard.To start off with, we decided our destination was New York.Initially, I thought it was a bad idea, ... Continuing: Then,After that,Next,As soon as / When full clause,... but thenImmediately, Examples: Then, I started to get worried.After that, we knew that there would be no problem!Next, we decided on our strategy.As soon as we arrived, we unpacked our bags.We were sure everything was ready, but then we discovered some unexpected problems.Immediately, I telephoned my friend Tom. Interruptions / New Elements to the Story: Suddenly,Unexpectedly, Examples: Suddenly, a child burst into the room with a note for Ms. Smith.Unexpectedly, the people in the room didnt agree with the mayor. Events Occurring at the Same Time While / As full clauseDuring noun (noun clause) Examples: While we were getting ready for the trip, Jennifer was making the reservations at the travel agents.During the meeting, Jack came over and asked me a few questions. Ending: Finally,In the end,Eventually,Lastly, Examples: Finally, I flew to London for my meeting with Jack.In the end, he decided to postpone the project.Eventually, we became tired and returned home.Lastly, we felt we had had enough and went home.