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SINO TECHNOLOGY

Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .

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SUNBEAM

Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales

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GREEN POWER

Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc

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DATAPOWER

Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.

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SEONG-HEE

Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc

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STD

Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.

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20kwh energy storage battery.What are the important reasons for the capacity degradation of lithium batteries

source:Industry News release time:2023-11-10 Hits: Popular:AG11 battery

　　Reason 1: Self discharge

　　Self discharge of lithium-ion batteries refers to the phenomenon of natural loss of capacitance when the battery is not in use. There are two types of capacity loss caused by self discharge of lithium-ion batteries: one is reversible capacity loss; The second is the loss of irreversible capacity. Reversible capacity loss refers to the capacity that can be recovered during charging, while irreversible capacity loss cannot be recovered. When self discharging for a long time or frequently, lithium ions will form a certain amount of deposition, increasing the degree of capacity imbalance between the two poles, leading to the loss of capacity in lithium-ion batteries.

　　Reason 2: Decomposition of electrolyte

　　In the normal operation of lithium-ion batteries, the electrolyte undergoes an oxidation reaction, which increases the concentration of the electrolyte and leads to a decrease in electrolyte stability, ultimately leading to a decrease in the capacity of the lithium-ion battery.

　　Reason three: overcharging

　　When overcharging a lithium-ion battery, it can lead to a decrease in discharge efficiency and capacity loss. Fast charging, excessive current density, severe polarization of the negative electrode, and more pronounced deposition of lithium ions. In situations where there is an excess of positive electrode active material relative to negative electrode active material, this reaction often intensifies. However, under high charging rates, even if the proportion of positive and negative active substances is normal, the deposition of metallic lithium may occur.

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