Service Hotline:
Mobile website
How difficult is it to improve the stability of lithium-ion batteries?
Release time:
2021-03-18 09:18
Source:
After the development in recent years, the lithium batteries currently equipped with pure electric vehicles are still low in stability and are obviously affected by temperature, which restricts consumers' use of cars to a certain extent. How difficult is it to improve the stability of lithium-ion batteries?
With the development of new energy industry, such as new energy vehicles are also facing many problems such as insufficient stability of lithium-ion batteries and high manufacturing costs, environmental pollution and so on. Lithium is currently the most active metal element. As long as it is exposed to the air, it will produce intense oxidation and redox reactions with oxygen. Therefore, once the quality of lithium-ion batteries is not good, it will not only spontaneously ignite, but also accumulate due to heat after heating. Explosion.
In short, whether it is in the process of charging and discharging, or in a static state, lithium-ion batteries may cause spontaneous combustion or explosion events due to increased internal temperature, uneven temperature between single batteries, etc. Very unstable. Over the years, in order to solve this problem, researchers have tried a variety of means, such as the design of built-in flame retardants, so that the lithium battery electrolyte can have better resistance to impact damage; or the use of water-based electrolytes that will not catch fire. To avoid low voltage and energy density due to water stability problems.
For the current new energy vehicles, ternary lithium batteries are mainly used, and some models use lithium iron phosphate batteries, and both batteries are liquid lithium ion batteries. However, for this kind of battery, although the energy density is higher than that of the previous nickel battery, there is still heat generation. Take a pure electric vehicle as an example. If a fast charging pile is used for long-term charging, the chemical reaction inside the battery will intensify, which will cause the heat to rise, and in severe cases, thermal runaway will occur.
lithium battery progress difficult reason, in addition to the phenomenon of heat, there is the material. Lithium is currently the most suitable electrode, which leads to the optimization of the material of the other pole and the improvement of the electrolyte and diaphragm. For example, it can reduce the resistance of the separator, increase the conductivity, expand the lithium ion transmittance, and improve the overall energy density and stability from this aspect. However, this method has little room for operation and has limited annual progress.
The fire risk of lithium-ion batteries is mainly determined by the amount of heat generated by chemical reactions in various parts of the battery. In the final analysis, the fire risk of lithium-ion batteries depends on the thermal stability of the battery material, and the thermal stability of the battery material depends on the chemical reactions that occur between its internal parts. At present, people mainly use differential scanning heat meter (DSC), thermal weight analyzer (TGA), insulation acceleration heat meter (ARC) to study the thermal stability of battery-related materials.
How to improve the stability of lithium-ion batteries?
By combining different structures of existing cathode materials, the stability of lithium-ion batteries can be further improved. Surface modification and electronic structure adjustment, such as coating a layer of manganese dioxide on the surface, can inhibit the diffusion of Yang, not only can improve the stability of its capacity, but also can improve its rate performance.
Improve the thermal stability of oxygen on the surface of lithium-ion battery materials, which can effectively inhibit the decline of lithium-rich manganese-based materials and improve the stability of the materials. At present, the lithium salts that have attracted people's attention are LiFSI bis (fluorosulfonic acid) lithium imide] and boron-based lithium salts. Among them, lithium bis-oxalate borate (LiBOB) has high thermal stability, the decomposition temperature is 302 ℃, and a stable SEI film can be formed on the negative electrode. LiBOB as a lithium salt and additive can improve the thermal stability of the battery.
lithium battery cathode materials can be synthesized by optimizing the synthesis conditions, improving the synthesis method, and synthesizing materials with good thermal stability; or using composite technology (such as doping technology) and surface coating technology (such as coating technology) to improve the thermal stability of cathode materials.
Summary: How to improve the performance of lithium-ion batteries, especially their cycle stability, under the premise of the available electrode material system of lithium-ion batteries is currently the focus and hotspot of research all over the world. It is very meaningful to predict and evaluate the reliability of lithium-ion batteries to control their thermal safety.
More information
HMM Participate in The Smart Energy Week Battery Show Japan 2025
Exhibition： The Smart Energy Week Battery Show Japan 2025 Date： Feb.19~21，2025 Venue：Tokyo Big Sight East & South Halls Booth : E45-18
Which brand of Japanese Ni-MH battery is more stable and durable?
Under normal use of nickel-metal hydride batteries, generally speaking, the discharge time of power batteries with high capacity is long, and the discharge time of small capacity is short. However, there are two kinds of performance: stability and durability in the use effect. They become an important reference factor for positioning Ni-MH batteries, because if the stability and durability are insufficient, after encountering some abnormal use, Ni-MH batteries that show the battery life according to their capacity may have some variables, and even the high capacity is not durable due to insufficient stability. After testing five mainstream Japanese nickel-metal hydride battery brands, a Japanese media believes that Sanyo products are the most stable and durable.
Summary of Lithium-ion Battery Safety Test Items and Methods
Lithium-ion batteries and monolithic samples consisting of non-user replaceable batteries/lithium-ion batteries and their electronics. For non-user replaceable batteries, they should be installed in electronic products as a whole sample for the environmental safety test of lithium ion batteries in the standard. For non-user replaceable lithium ion batteries, they can be placed in electronic products as a whole sample, or the lithium ion battery can be taken out separately for the environmental safety test of lithium ion batteries in the standard. It is recommended to test as a whole sample first. As the test process may be deflated, smoke, fire or even explosion, it is necessary to take the necessary protective measures
Main battery type recycling methods and their recycling purposes
Different types of lithium batteries are widely used in different occasions, more scientific and economical recycling of waste batteries for reuse is a cause conducive to nature and human health. After hundreds of years of development, the basic recycling methods for major battery brands are the same in countries around the world. 1. dry batteries: alkaline manganese dry batteries and zinc manganese dry batteries, that is, generally referred to as carbon batteries and alkaline batteries. This type of battery is currently required to ban the use of mercury, so it is safe in life. For this reason, there is no requirement to recycle such batteries. Of course, those who are willing to recycle can engage in this aspect of business, and users do not have any in the garbage can.
Explosion-proof measures for battery and lithium battery
The safety of lithium-ion batteries has always been an important issue that plagues the industrialization of lithium batteries. The battery explosion accidents exposed in recent years are all caused by the use of lithium batteries. Compared with other types of batteries, this is determined by the special nature of lithium battery materials and processes. To this end, we should understand the knowledge of lithium battery explosion, we try to explain from the following three aspects. 1., the national standard stipulates that any part of the solid material within the battery is instantly discharged, and the distance that is pushed to the lithium battery above 25cm is called an explosion. The identification method in the experiment is: cover the experimental battery with a circular mesh so that the battery is located at the center of the circle, I .e. 25cm from any side of the mesh cover. If no solid part of the experiment passes through the mesh cover, it is proved that the battery has not exploded. Here, the "net" has a specific to show: the net wire adopts a soft aluminum wire with a diameter of 0.25mm, and the density of the net is 6~7/cm. 2. how to prevent lithium battery explosion All lithium battery explosions are caused by short circuit caused by battery heating, and the cause of short circuit and over charge, over discharge, positive and negative direct docking, electrolyte leakage and so on. Therefore, in the design of lithium batteries, the following points can be started: 1. It is forbidden to overcharge the battery to more than 4.2V; 2. It is forbidden to overcharge the battery to less than 2.75V; 3. An explosion-proof valve is installed on the metal shell; 4. Prevent short circuit in the process. The best way, of course, is to have a battery protection circuit board design. Although this will increase the manufacturing cost of lithium batteries, it is necessary for the safe use of lithium batteries. All regular lithium battery manufacturers can not avoid this design. 3. polymer lithium battery is the use of flexible packaging and polymer electrolyte made of a lithium battery products, under normal circumstances, the use of storage will not explode, unless man-made strong damage caused by its short circuit. In order to reduce the occurrence of explosion accidents, polymer lithium batteries are being used in more and more occasions. Although lithium batteries are still in the process of replacing other types of batteries, polymer lithium batteries have begun to replace ordinary lithium batteries in some areas.
Lithium Battery Market Analysis in 2020
The lithium battery industry market analysis report is an analysis of the lithium battery industry market size, market competition, regional market, market trends and the scope of attraction. It refers to the lithium battery industry market research and supply and demand forecasts, according to the market environment, competitiveness and competitors of the lithium battery industry products, analysis and judgment of the lithium battery industry products in a limited time whether there is a market, and what kind of marketing strategy to achieve sales goals or what kind of investment strategy to enter the lithium battery market. The main analysis points of the lithium battery market analysis report include: 1) lithium battery industry market supply analysis and market.
Contact Us
Tel&WhatsApp: +86-18681521828
E-mail: export@hmm-machine.com
Add.: No. 5 Weifeng Road, Niushan Wai Jing Industrial Park, Dongcheng District, Dongguan City
Links: