Factors influencing the cycle performance of lithium-ion battery
Published Date: 2017-07-06 02:18
Category: Frequently Asked Questions
With the development of science and technology, lithium battery applications are more and more widely. After several cycles of charge and discharge, the battery capacity performance will decline. The process of lithium ed in every aspect, including product R&D, supplier management, material control, product process control, finished Shipping and after-sales service.
We adhere to the customer-oriented requirements, to provide customers with satisfactory products with pragmatic and rigorous attitude, to provide customers with products beyond the expectations with innovative technology and craftsmen spiri/div>
1.Design and manufacturing processes
(1). Moisture
Excessive moisture will appear with side effects with active material of positive and negative, destroying the structure and then influencing de circulation. In addition,ry ( ( #`| l" pl" Y" T" S" j" j" @h| Hl" l" h| hX d it is not conducive to the formation of SEL film, but when the trace of moisture is difficult to remove, trace of water may also ensure the performance of the battery in a certain extent.
(2). Positive and negative compaction
If the positive and negative compaction is too high, it can reduce cycle performance of tgeFeatures:
High and stable operating voltage: standard voltage is 3.6V and the operating voltage throughout the life of the period to maintain a significant stable.
Better storage life and reliability: with low self-discharge characteristics, the annual self-discharge rate 2%, while its use of stainln be recycled. In addition, high compaction of positive and negative is hard to ensure the high preserving fluid volume. Preserving fluid volume is the basis of cell to cycle normal or more cycle times.
gmn mercury, cadmium, lead and other heavy metals, no environmental hazards.
Good sealing performance: Li-SOCl2 battery is fully sealed battery. The battery cover is welded to the battery casen
(3). Excessive negative
As for lithium cobalt oxide added graphite system, graphite cathode becomes short boarde/image/20170525/20170525022496119611.jpg" alt="" />
ze:13.3333px;">
We will further optimize and standardize the management system, and continuously improve quality and servi which is a common situation in the process of circulation. If excessive negative is not sufficient, the cell may not analyze the lithium before cycle. But after hundreds of times cycle, the structure of positive changes little and the structure of negae="text-align:justify;">
tive is destroyed seriously and cant fully receive lithium-ion provided by positive to analyze the lithium which cause prematurely decline of capacity.
(4).be Coating film density
Membrane density can bring capacity difference or battery winding or lamination layers difference. For the same as material with cwer , In order to balance the charge and discharge, to papacity with batteries, reducing the membrane density is equivalent to add a layer or multilayer winding or laminated layer. Corresponding to the increase in the diaphragm can absorb more electrolytes in order to keep the cycle. In addition, thinner film n cadiv>
SMBus Communication Functions
a package case, among them, the cell protection control circuit works as a guardian to support the entire intelligent battery system management, which is called SMBus (System Management Bus). The communication function of battery packs mainly rely ony have a negative effect on the coating and rolling. Furthermore, more layers mean more foil and diaphragm, which means higher costs and lower energy density. Therefore, we need to do the balancing consideration when assessing.
(5). Material category
Selecting material is the most important factor influencingdiv>ormation, please visit the product center of our website.
y i| 1`| @i| i| yy Pl| the performance of lithium-ion battery. From the point of materials, there are two kinds of cycle performance. One is the cycle performance after matching anode and electrolyte, and another is the cycle performance after matching cathode and electrolyte.sist1`| i| @i| @gy l| i| i| i| 2`| h| h| @Fy h| 2`| h| h| y 0l| `h| 2`| h| @h| The cycle performance of the whole battery depends on the poorer one between these two kinds of cycle performance. The cycle performance of materials is poor. There are maybe two reasons. On the one hand, crystal structure changes too fast to continue to| k| k| k| k| k| finish inserting and dropping in the cycle process. On the other hand, active materials and its corresponding electrolyte cant produce dense and homogeneous SEI film, leading to the active materials and corresponding electrolyte generate side reaction k| k| k| too early, because of that, electrolyte consumes too fast influencing cycle. In the process of designing cell, if one pole certainly selects the material with poor cycle performance, another pole neednt to select material with good cycle performance, be cause of wasting
2The influence of environmental factors of battery using
(1). Temperature environment
The temperature environment is too low or too high will affect the cyct, etc. The internal heat increased significantly, which prone to spark, burning or even explosion, cell balanced measures must be taken to ensure safety and stability.
le life of lithium battery.
The discharge capacity of lithium battery will be reduce at low temperature environment. Because of Li-ion is easier to disengage from the negative pole, and more difficult to p>
The system management bus (SMBus) is a two-wire interface to ensure the communication between equipment and k| k| k| k| k| k| embed at low temperature, When charging, lithium metal will appear and react with the electrolyte to form a new SEI film covering the original SEI film, so that the battery impedance increases, resulting in battery capacity decline. Lithium battery chargeead the conversion data and status, and control the intelligent battery management system according to the requirement of host.
and discharge cycle is unstable at high temperature, high temperature lead to the electrode electrochemical polarization intensifies and gas generation, resulting in bulging phenomenon, while the charge transmission resistance increases, ion transport kinetics to reduce.
(2). Transport Process
Equipment that uses lithium-ion batteries may experience the test such as vibration, shock, impact, etc. when transported or under normal operation. Some lithium batteries charge and discharge with the system communication and receive data according to a certain frequency. The vibration frequency of equipment may cause interference to the battery, which may cause the chip data to be faulty or cause protection circuit action. Strong vibration or shock, The pole of the battery, the external wiring, terminals, tabs may be broken or off, he active material on the pole of battery may also peel off, which will affect the battery cycle life and even dangerous
(3). The Influence of Charge and Discharge System in the Circulation Process
Lithium battery using is the process of charge and discharge cycle, charge and discharge current, cut-off voltage and the methods of charge and discharge are influence battery cycle life. Blindly increase battery current and charge cut-off voltage, reduce the discharge cut-off voltage will make the battery performance down.
