The directors of the listed copper foil companies are:
1. North Co., Ltd. : the leader in copper foil.
In the second quarter of 2021, the company achieved total revenue of 1.118 billion, a year-on-year increase of 151.82%; net profit was 136 million; In recent years, with the vigorous development of China's lithium battery industry and its new energy automobile industry, the demand for electrolytic copper foil for lithium batteries has increased sharply.
2. Jiayuan Technology: Copper foil faucet.
In the second quarter of 2021, the company achieved total revenue of 675 million, a year-on-year increase of 161.82%, net profit of 134 million and a gross profit of 208.6 million. The leader in ultra-thin copper and lithium foil and the second largest manufacturer of copper and lithium foile lithium in China. It is one of the few enterprises in China to carry out mass production of 6μm ultra-thin lithium copper foil, with actual annual output. 18,300 tonnes of copper and lithium foil.
3. Chaohua Technology: Copper foil faucet.
In the second quarter of 2021, the company achieved total revenue of 658 million, a year-on-year increase of 105.97%; net profit was 40.09 million. It is one of the few listed companies in China to cover the entire industrial chain of copper clad laminates, electronic copper foils and lithium battery copper foils. The company has added 8,000 tons of copper sheet production capacity, and the current copper sheet production capacity has reached 20,000 tons. The company already has the capacity to mass produce battery copper foil au 6 m lithium. Other copper foil concept stocks include: Qixin stocks, Jinan Jiguo, ST Danbang, etc.
: 1. According to reports, the total planned investment in the 200,000 ton high-quality electrolytic copper foil project is about 12.15 billion yuan. According to preliminary calculations that the project capital accounts for 35% of the total investment, Baiyin Nonferrous will invest about 1.57 billion yuan in proportion to its stake, and the final investment will be subject to the actual investment. In addition, the main products of the project are initially determined to be electrolytic copper foil for 4.5 μm and 6 μm lithium batteries. According to the project construction plan, 12,000 tons were completed and put into production in October 2019, and the production capacity will be 30,000 tons by the end of 2021. Construction of the 40,000 ton project has startedin October 2021 and is expected to be completed and put into production by the end of 2022. A new production line of 130,000 tons will be built, and it is planned to fully complete the 200-ton high-quality electrolytic copper foil project. 000 tonnes in 2025.
2. Battery Network noticed that Baiyin Nonferrous Metals Co., Ltd. is a leading manufacturer of copper products in China, with an annual output of 200,000 tons of cathode copper. The main raw material for high quality electrolytic copper foil projects is copper. The company can give full play to its copper raw material advantages to ensure the stability of the project supply chain and lay a solid foundation for project construction. Baiyin Nonferrous said the company will cooperate to build a 200,000 ton high-end electrolytic copper foil project and create the largestproduction base of the world's high-end electrolytic copper foil for batteries, which will help promote the transformation and upgrading of the enterprise. The implementation of the project will bring the scale of the company's lithium battery copper foil products to a new stage, greatly optimize costs, greatly improve technology development capabilities, form a reasonable industrial platform and will further improve the competitiveness of the industrial chain.
3. It is worth noting that before Baiyin Nonferrous announced an increase in copper foil production capacity, Lianghai Co., Ltd., which has also been deeply involved in the copper processing industry for more than 30 years , published an announcement on November 7. The company plans to establish a holding subsidiary Gansu Lianghai New Energy Materials Co., Ltd. with an investment of 8.9 billion yuans ((including working capital of 2 billion yuan), to build a high-performance copper foil materials project with an annual output of 150,000 tons (provisional name). After it is put into operation, the company will have a production capacity of 150,000 tons of high-performance copper foil
4 In addition to copper processing enterprises using their own industrial advantages to transform their layout, Jiayuan Technology, the leader. of copper foil production, also continues to increase its investments in early November, after revealing its fixed income plan and planning to raise no more than 4.9 billion yuan to expand the production of several copper foil projects. copper and lithium foils, Jiayuan Technology once again announced its intention to establish a joint venture with Contemporary Ampuri Technology Co. , Ltd. Construction of high copper foil project.te performance with an annual production of 100,000 tonnes. In addition, the two parties agreed to plan a new high-performance copper foil with an annual output of 100,000 tons, based on the construction and production status of this joint venture project.
5. According to the analysis of Kaiyuan Securities' recent research report, benefiting from the large quantities of new energy vehicles and energy storage, the demand for copper foil and lithium has increased significantly. The compound growth rate of global lithium copper foil/ultra-thin copper foil demand is expected to reach 35.43%/79.03% from 2021 to 2023. On the supply side , although the industry plans to increase its production capacity on a large scale, it still faces constraints in equipment, capital and technology. The compound growth rate of global fire supply is expected tolithium copper foils/ultra-thin copper foils reaches 22.97%/57.19% from 2021 to 2023, which is lower than the growth rate of demand, and supply and demand will continue to expand improve. There may be a gap between the supply and demand of ultra-thin copper foil, which will accelerate the prosperity of the industry and further increase processing costs, which will directly benefit the production of copper foil in China. lithium.
What is the reason for the precipitation of copper on the aluminum foil of the positive electrode?
For the lithium-ion secondary battery we manufacture, the current collector of the positive electrode is aluminum foil and the negative electrode is copper foil. During the initial training process, the voltage increases from about 0.5V to about 1.6V in about 15 minutes, which is very fast. No matter how hard I charged it, the tension didn'tcould not increase. I removed the battery and took it apart. I found copper on the surface of the positive. electrode. I don't know what caused it. Please give me some advice. THANKS !
I really hope that Brother Aubergine will pin it, because this phenomenon is very rare!
I think it's not copper, after all, the power inside is not too big,
And after disassembling the battery, it's there is current, the electrolyte is not yet dry,< /p>
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We will all notice that the negative electrode is made of gold.
But how can we judge the precipitation of copper in the positive electrode?
Are your batteries appearing in batches in the workshop? Or does it appear on individual stacks?
I think your battery polarity was reversed during training, which caused reverse charging during training, and the copper from the negative electrode dissolved and precipitated into the positive electrodeve. I think you can go back and find out if the battery was reverse charged?
If not, I would also like to know what the reason is.
If it is a problem with the battery test cabinet, I think the positive and negative poles are connected in reverse. In this way, the potential of the Cu foil must be low, so that the Cu will be oxidized during. charged, and the Cu ions will be dissolved in the electrolyte. They propagate to the other pole and settle, so the voltage cannot be charged.
Reverse charging: the positive electrode becomes copper plated
I have encountered this before issue. The battery is shorted and the battery voltage is still very low. When current flows again, the negative electrode dissolves. under low voltage
It must be a reverse charge! It was placed upside down when put on the shelf. I also met him before.
The battery was clamped upside down and electrolysis occurred.
My own data and experiments show that
No painful precipitation was observed when the positive and negative poles were reversed, but excessive discharge caused copper precipitation.
Overdischarge~
The copper was electrolyzed, transformed into ions, and ran to the positive electrode~~ When the discharge voltage of the lithium-ion battery is below 3.0 V and forced to continue discharging, copper will precipitate at the positive electrode. The principle is this: the negative electrode will lose electrons during discharge, and at that time all the lithium has gone to the positive electrode. Naturally, it cannot provide electrons, so only. carbon or copper can provide electrons, and copper provides electrons. The capacity of copper is much stronger than that of carbon (you canfind out by looking at the standard electrode potential of copper and carbon), so copper donates electrons, and copper that. gives electrons copper ions. Of course, these ions must be used as the positive electrode (the reason is not (explained), so the copper precipitates on the positive electrode
This is caused by excessive discharge. .Excessive discharge is equivalent to reverse charging, which is also equivalent to copper plating on aluminum.
The battery is reverse charged and over-discharge and short circuit will cause copper precipitation in the positive electrode.
gumphong explained it clearly It's just that it is more difficult to analyze the reason. However, if it is at the beginning of its training, the range. voltage from 0.5V to 1.5V indicates that it can be charged and over-discharge can be excluded (the initial low voltage cannot be regarded as over-discharge). The possibility of reverse charging is relatively high. When the electrodes are connected in reverse, the voltage continues to increase because there is still ion migration. So it takes 15 minutes to reach 1.5V. Generally speaking, charging to 2.6 V between 1000 and 1200 S (17 to 20 min) is considered normal. We see that the polarization of the poster is important when charging, or that the consumption is too high. We therefore assume that it is most likely a short circuit. When charging and consuming at the same time, a circuit appears inside the battery, so in theory it is as Gummhong says. Of course, the possibility of a counter-accusation cannot be ruled out. You can find a counter to confirm your channel and the problem will be resolved.
Answer: What is the reason for the precipitation of copper on the aluminum foil of the positive electrode?
Don't limit yourself to copper,the red ** can be Co, Mn or CU
In view of the situation you mentioned, the Mn can be caused by a micro short circuit. the possibility of a disproportionate reaction is relatively high; the second possibility is that the instantaneous over-emission of CU is caused by a micro-short circuit; the third possibility is that your Li--Co--OO has a decomposition reaction (this possibility is relatively high). rare); the fourth possibility is that caused by instability of the electrolyte system.
What a fool, haha! It is recommended to leave the positive electrode exposed for a few hours and then observe the situation!
Answer: What is the reason for the precipitation of copper on the aluminum foil of the positive electrode?
Our company has specially organized and analyzed this problem. The most important thing is that the quality of the positive and negative electrodes is not good enough. If the configuration is good, par example, if the positive electrode sheet is much thicker than the negative electrode sheet and the negative electrode sheet is relatively thin, there will be a situation like the comrade above said: " The lithium-ion battery is forced to continue discharging when the discharge voltage is lower than 3.0V, copper will precipitate at the positive electrode. The principle is: the negative electrode will lose electrons during discharge, and at that time all the lithium has gone to the positive electrode. Naturally, it cannot provide electrons, so only carbon or copper can provide electrons, and copper provides electrons. The capacitance of copper is much stronger than that of carbon (you can tell by looking at the standard electrode potential of copper and carbon). , so copper donates electrons, and the copper that donates electrons becomes copper ions. GOODSure, these ions should be used as the positive electrode (the reason is not, please explain), so the copper is precipitated from the positive electrode. This poster analyzed the reason very thoroughly. This phenomenon is not a unique problem.
1. During reverse charging, the entire positive electrode sheet should be covered with copper
2. Due to a problem with the test cabinet, a small current was used for reverse charging. for a short time;
3, Battery short circuit, it is most likely, especially for small size batteries, if mass produced, the defect rate can reach 30-40%.
Therefore. It is recommended to identify the pole piece. Analyze elementary content. What is the reason for the precipitation of copper on the aluminum foil of the positive electrode?
Reverse battery charging and battery short circuitwill cause copper precipitation. In your case this is due to a short circuit. What is the reason for the precipitation of copper on the positive aluminum foil?
If the quantity is large, it is a reverse charge. If the quantity is small, it may be an internal short circuit. After identification, the element is made of copper, and it is indeed an internal short circuit. battery cell. It also mainly appears on small batteries (like 501220), and the proportion is not large. --------The possibility of short circuit and insect repellent is very high.