Dry battery electrodes made of graphite are not chemical changes

The adsorption of pigments by activated carbon is not a chemical change, but only uses a loose porous structure to adsorb fine substances, and there is no chemical reaction.

Dry ice made from carbon dioxide is not a chemical change, note that dry ice is sublimation, not gasification, dry ice sublimation absorbs a lot of heat, so that the ambient temperature is reduced, and the water vapor is cold to form small water droplets, and there is no chemical reaction.

The use of carbon dioxide as a gaseous fertilizer is a chemical change because carbon dioxide is absorbed by plants to produce oxygen.

CO2 + H2O C6 H10 O5)N (Glucose) + O2 There is a chemical reaction and new substances are formed, so it is a chemical change.

The electrode of graphite dry battery is not a chemical change, because graphite does not change, it is always graphite, and graphite has no chemical reaction to form other substances, it is not a chemical change.

The theorem is that "a chemical change leads to the formation of new substances", and it is necessary to determine whether there is a chemical change.

Adsorption pigments use the small pores of activated carbon to adsorb substances, and the small pores are very small and tiny droplets.

Dry ice uses vaporization to absorb heat.

The first two are both physical changes.

Carbon dioxide fertilizer is actually carbon that provides photosynthesis for the synthesis of other organic substances, which is of course a chemical change.

The first two are not, as no new matter is generated. Finally, carbon dioxide is finally absent from the photosynthesis of plants. Other substances are generated.

In fact, it is very simple to determine whether a change is a physical change or a chemical change, as long as there is a new substance generated, there is a chemical change, and if there is no physical change.

The first two are physical changes because they are all physical properties, and the last one is that photosynthesis is chemical changes.

Graphite is used as an electrode to take advantage of its physical properties rather than chemical properties.

The graphite rod is used as a dry battery electrode, which is ground and burned, and uses the conductivity of graphite, which can be manifested without chemical changes. The electrical conductivity of graphite is a hundred times higher than that of ordinary non-metallic minerals. Thermal conductivity exceeds that of metallic materials such as steel, iron, and lead.

The thermal conductivity decreases with increasing temperature, and even at extremely high equilibrium temperatures, graphite becomes an insulator. Graphite is able to conduct electricity because each carbon atom in graphite forms only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transport the charge.

Summary. Hello, what's the problem?

Hello, what's the problem?

I would like to ask how graphitized electrodes are formed by air oxygen.

Okay, wait a minute.

Graphite electrode is a kind of high-temperature graphite conductive material made of petroleum coke (carbon) asphalt coke (carbon) as granular raw material and coal pitch as binder, after calcination, crushing, batching, kneading, molding, baking and firing, graphitization cracking such as and machining, etc., the reason for the oxidation of graphite electrode is that it is oxidized by chemical reaction with oxygen peanuts in the air at high temperature.

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In dry batteries, graphite is generally used to make anodes. Dry batteries work by creating a potential difference between the positive and negative electrodes, and when the negative electrode is connected to the positive electrode, the circuit closes and the flow of electrons begins, generating electrical energy in the process. In dry batteries, the positive electrode is usually made from a mixture of metal powders (e.g. manganese dioxide) and electrolyte talk, while the negative electrode is usually made from a mixture of graphite (i.e., graphite rods) and an electrolyte.

When the dry cell is discharged, the metal powder in the positive electrode will accept electrons, while the hydrogen ions (or alkaline ions) in the electrolyte will be absorbed by the oak, and the graphite in the negative electrode will release electrons, and the ions in the electrolyte will be released. As a result, graphite is often used as a negative electrode in dry batteries to produce electrical energy by releasing electrons. It should be noted that although graphite can be used as a negative electrode, its electrochemical properties and the combination of other materials will have an impact on the performance of dry batteries in the actual use process, so different combinations of materials can achieve different battery performance.

Summary. In dry batteries, graphite is mainly used as the negative electrode. It is responsible for accepting electrons from the metal oxide cathode, forming an electric current.

The negative electrode action of graphite is to deplete the oxide while causing the metal to appear by releasing electrons to the cathode. The special structure and chemical properties of graphite make it particularly suitable as an anode for dry batteries. The layered structure of graphite gives it good electrical conductivity and facilitates electron transport.

At the same time, graphite has high chemical stability and can react weakly with the electrolyte, thereby reducing the loss of battery self-discharge and life, and improving the service life of the battery.

In dry batteries, graphite is mainly used as the negative electrode. It is responsible for accepting electrons from the metal oxide cathode, forming an electric current. The negative electrode action of graphite is to deplete the oxide while causing the metal to appear by releasing electrons to the cathode.

The special structure and chemical properties of graphite make it particularly suitable as an anode for dry batteries. The layered structure of graphite gives it good electrical conductivity and facilitates electron transport. At the same time, graphite has high chemical stability and can react weakly with the electrolyte, thereby reducing the loss of battery self-discharge and life, and improving the service life of the battery.

Pro, the benefits of dry battery graphite as an anode include:1Good electrical conductivity:

The layered structure of graphite has good electrical conductivity, which enables the rapid transfer of current inside the battery. 2.High chemical stability:

Graphite electrodes react slower with the electrolyte, which means less self-discharge and lifetime loss of the battery3Earth-friendly: Graphite is an environmentally friendly material that can reduce the environmental impact of battery waste due to its chemical stability.

Pro, dry batteries do negative electrodes, it should be noted that: 1The graphite part of the dry battery contains toxic substances such as lead and mercury, and the used battery should be properly disposed of and not discarded.

2.Prevent the use of failed batteries and avoid unnecessary safety hazards. 3.

Avoid over-discharging the battery, especially in high-temperature environments, which may cause battery failure and even**. Therefore, if the ambient temperature is high, it is necessary to pay attention to the storage effect of the battery. In conclusion, the advantages of dry battery graphite as an anode are obvious, but safety and environmental protection need to be paid attention to when using it.

For the proper disposal of failed and discarded batteries, users should carefully read the instructions on the battery packaging and follow the instructions for correct use and disposal.

Summary. Dry cell graphite is the positive electrode, the shell of the dry battery is metallic zinc, which acts as the negative electrode, the central carbon rod (graphite) is the positive electrode, and the carbon law is surrounded by a layer of black substance wrapped in paper, which is a mixture of graphite powder and manganese dioxide, and the paper and zinc shell are filled with a pasty white electrolyte, the composition of which is ammonium chloride, zinc chloride and starch paste.

Dry battery graphite buried is the positive electrode, the shell of the dry battery is metal zinc, as the negative electrode, the carbon rod (graphite) in the middle bend core is the positive electrode, the carbon law is surrounded by a layer of paper wrapped in a black substance, which is a mixture of graphite powder and manganese dioxide, between the paper plum and the zinc shell is filled with a pasty white electrolyte, the composition of which is ammonium chloride, zinc chloride and starch paste.

Because the positive electrode Zn is the bridge blind cathode, then after the power is applied, Zn must be oxidized to Zn2+ and dissolved If this is not what you need, it can't be used as a positive electrode Graphite is an inert electrode, as a positive electrode, it basically does not react by itself, then it is an oxidation reaction of a certain substance in the solution, and Hu Xiaojiao is on the negative zinc electrode, a reduction reaction occurs, such as the deposition of Zn2+ in the solution, the zinc electrode itself will not change, and the graphite in the lithium-ion battery is used as the negative electrode, in the zinc-manganese dry battery, Graphite is mixed with manganese dioxide to make a cathode. Generally, the graphite used in lithium-ion batteries is at the negative end for lithium-ion intercalation and de-intercalation. Its cathode is a metal oxide embedded in lithium, such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide and lithium iron phosphate.

In the dry battery, due to the poor conductivity of manganese dioxide, graphite is added to improve the conductivity of the cathode.

Summary. Hello dear, glad to answer for you.

1. It is used in arc steelmaking furnace.

The graphite electrode is used in electric furnace steelmaking, which uses the graphite electrode to conduct the amount of current into the furnace, and the strong current is used at the lower end of the electrode to generate arc discharge through the gas, and the calorific value caused by the electric solitary is used for smelting.

2. Used in submerged thermal electric furnace.

The graphite electrode submerged thermal heating furnace is used to produce ferroalloys, pure silicon, yellow phosphorus, matte copper and calcium carbide.

3. It is used in resistance furnace.

Graphitization furnaces for the production of graphite products, melting furnaces for melting glass, and electric furnaces for the production of silicon carbide are all resistance furnaces, and the raw materials contained in the furnaces are not only hot resistors, but also the targets of heating.

4. For processing.

Many graphite electrode blanks are also used to produce and process into various crucibles, graphite boats, hot die-casting molds and vacuum electric furnace heaters and other goods.

What is the use of the battery anode after graphitization processing?

Hello dear, glad to answer for you.

The applications of the battery anode after graphitization are as follows:

1. It is used in arc steelmaking furnace.

The graphite electrode is used to make steel, and the electric furnace chain family steelmaking is to use the graphite electrode to conduct the current flow into the furnace chamber, and the strong current is generated at the lower end of the electrode through the gas shed to produce arc discharge, and the heat generated by the electric orphan is used for smelting.

2. Used in submerged thermal electric furnace.

The graphite electrode submerged thermal heating furnace is used to produce ferroalloys, pure silicon, yellow phosphorus, matte copper and calcium carbide.

3. It is used in resistance furnace.

The graphitization furnace used in the production of graphite resistant products, the melting furnace for melting glass, and the electric furnace for the production of silicon carbide are all resistance furnaces, and the raw materials contained in the furnace are not only hot resistors, but also the target of heating the nuclear signal.

4. For processing.

Many graphite electrode blanks are also used to produce and process into various crucibles, graphite boats, hot die-casting molds and vacuum electric furnace heaters and other goods.

The graphite you are talking about should be the carbon rod of a dry battery, and the quality does not change under normal circumstances.

The most common dry cell is a zinc-manganese dry cell.

1. The acid zinc-manganese dry battery uses the zinc cartridge as the negative electrode, and the positive electrode material is a mixed paste composed of manganese dioxide powder, ammonium chloride and carbon black. A carbon rod is inserted in the middle of the cathode material to act as a conductor for the eliciting current. Between the positive and negative electrodes, a reinforced isolation paper is saturated with an electrolyte solution containing ammonium chloride and zinc chloride, and the upper part is sealed.

It can be expressed as: )zn|nh4cl（20%）zncl2|mno2，c（+）

The reaction is as follows: the cathode is cathode, and manganese is reduced from tetravalent to trivalent.

2mno2+ 2nh4++2eˉ→2mno(oh) +2nh3

The negative electrode is the anode, and the zinc is oxidized to divalent zinc ions combined with ammonium to form diammonium zinc ions

zn+2nh3 - 2eˉ→zn(nh3)2 2+

The total battery response is:

2mno2+zn+2nh4cl→2mno(oh)+zn(nh3)2cl2

pH=5 before discharge, and pH rises to pH=7 after discharge.

The characteristics of the battery: (1) the open circuit voltage is; (2) Raw materials are abundant and inexpensive; (3) Various models: No. 1 and No. 5; (4) It is easy to carry and suitable for intermittent discharge occasions.

The disadvantages are: the voltage is constantly decreasing during use, can not provide stable voltage, and the discharge power is low, the specific energy is small, the low temperature performance is poor, and it cannot work at 20. In alpine areas, only alkaline zinc-manganese dry batteries can be used.

2. Alkaline zinc-manganese battery is referred to as alkaline manganese battery, when KOH electrolyte solution is used instead of NH4Cl as electrolyte, the specific energy and discharge current of the battery can be significantly improved. Its battery expression is:

Zn Ju Xiaochun Koh,K2[Zn(OH)4] mNO2,C(+).

The electrode reaction is as follows:

The cathode reacts with cathode:

mno2+h2o+eˉ→mno(oh)+ohˉ

MNO(OH) has a certain solubility in alkaline solutions.

mno(oh)+h2o+ohˉ→mn(oh)4

mn(oh)4+2eˉ→mn(oh)42-

The negative electrode is the anodic reaction:

zn+2ohˉ→zn(oh)2+2eˉ

zn(oh)2+2ohˉ→zn(oh)4

The total battery response is:

zn+mno2+2h2o+4ohˉ→mn(oh)42ˉ+zn(oh)4

Because the positive electrode cathode reaction is not all solid-phase reaction, and the negative electrode anode reaction is soluble Zn(OH)4, so the internal resistance is small, and the voltage recovery ability after discharge is strong. The alkaline zinc-manganese battery uses high-purity and high-activity positive and negative electrode materials, as well as alkali with strong ionic conductivity as the electrolyte, so that the electrochemical reaction area is doubled. Features:

1) The open-circuit voltage is; (2) The operating temperature range is between -20 and 60; (3) The capacity of high-current continuous discharge is about 5 times that of acid zinc-manganese battery; (4) Its low-temperature discharge performance is also very good.