At the core of batteries are a multitude of materials, each with its distinct characteristics and purposes. Battery material plays an important role in the development of battery. Most of top bess supplier try to develop their battery energy density through the battery material.Â
In this article, we will explore the details of battery material. Along the way, we will also talk about the potential battery material hold for the future.
What do battery materials include?
The composition of a battery is a complex and delicate process. When we talk about battery material, there are 4 key material in a battery: positive electrode material, negative electrode material, electrolyte and separator.
Taking a lithium ion battery pack as an example, the positive electrode material is responsible for releasing lithium ions during the discharge process, while the negative electrode material is responsible for storing these ions during the charging process. Electrolytes play a crucial role as they provide the medium through which lithium ions move between the electrodes, and finally, separators are crucial as they prevent physical contact between the electrodes while allowing the ions to pass through.
However, battery materials all have their own unique challenges, as they all face certain development limitations. These limitations may be due to factors such as limitations in raw material availability, challenges in the production process, or even due to the inherent chemical properties of these materials.
Battery material parameter analysis
When it comes to battery materials and their related parameters, here are some common materials and detailed descriptions of their characteristic parameters:
| Positive electrode materials | Typical operating voltage | Specific capacity | Cycle life |
|---|---|---|---|
| Lithium cobalt oxide (LiCoO2) | 3.6-3.7V | 140-160 mAh/g | typically several hundred cycles |
| Lithium Nickel Manganese Oxide (LiNiMnCoO2) | 3.6-4.2V | 200 mAh/g | up to several thousand cycles |
| Lithium Iron Phosphate (LiFePO4) | 3.2-3.3V | 160 mAh/g | typically several thousand cycles |
| Negative electrode materials | typically several hundred cycles | Cycle life |
|---|---|---|
| Graphite | 350-365 mAh/g | typically several hundred cycles |
| Lithium metal | 3860 mAh/g | prone to safety problems and limited lifespan |
| Silicon | 3000-4200 mAh/g | limited by volume expansion, cycle life is short |
| Electrolytes | Ionic conductivity | Combustion temperature (thermal stability) |
|---|---|---|
| Liquid electrolyte (organic solution) | typically 10^-3 - 10^-2 S/cm | needs to be higher than battery operating temperature |
| Solid electrolytes (oxide ceramics, polymers) | typically 10^-4 - 10^-2 S/cm | usually maintains good stability at high temperatures |
It should be noted that the characteristic parameter of battery material may vary due to preparation methods, purity, content and other factors. In addition, different types of batteries (such as lithium-ion batteries, nickel-metal hydride batteries) as well as different manufacturers and product lines may also have slight differences in material combinations and parameters. Therefore, in practical applications, factors such as battery performance, cost, safety, and sustainability need to be comprehensively considered to select the most appropriate material.
Impact of battery material on batteries
Positive electrode materials
Positive electrode materials account for 20%-30% of the production cost of lithium batteries and are an important factor in determining the performance of lithium batteries. Its main technical routes include lithium cobalt oxide, lithium manganate, lithium iron phosphate, ternary materials, etc.
With the change of technology, high-nickel ternary products with energy density advantages and lithium iron manganese phosphate with safety and economic advantages are the main development directions. Lithium iron manganese phosphate cannot really solve the problem of energy density improvement because it is more of a substitute for low-nickel ternary materials and lithium iron phosphate materials. High-nickel ternary materials are still the ceiling for the energy density of cathode materials.
Negative electrode material
As a carrier of lithium ions and electrons, the negative electrode material is mainly responsible for the storage and release of energy, which can directly affect the energy density, battery life cycle, safety, fast charging capability and other properties of the battery. At present, the main anode material is artificial graphite, accounting for about 10%-15% of the cost of lithium-ion batteries.
However, from the perspective of application, the actual specific capacity of graphite anode material has now reached 360-365mAh/g, approaching the theoretical limit of 372mAh/g. , restricting industrial development. The industry generally believes that silicon-carbon anode materials with high specific capacity (silicon specific capacity up to 4200mAh/g, 10-12 times that of graphite materials) will become the development direction of anode materials in the future.
Electrolyte
The electrolyte has a great influence on the comprehensive performance of lithium batteries such as high and low temperature performance, rate performance, and safety performance. The electrolyte formula is also an important research direction. The electrolyte consists of solvent, lithium salt, and electrolyte.
The most important components are lithium salt and additives, with the addition amounts of approximately 12% and 8% respectively. Lithium bisfluorosulfonyl imide (LIFSI) is currently used as an additive in electrolytes (adding amount is about 0.5%-1%), and has attracted widespread attention due to its potential as a mainstream lithium salt application in the future. Although the advantages are obvious, the expansion rate of silicon materials can easily affect the first charge efficiency and life of the battery, restricting its commercial application in negative electrodes.
Separator
The lithium battery separator is a film with a microporous structure. It is the key inner component with the most technical barriers in the lithium-ion battery industry chain. It is also the latest link to achieve domestic production. It accounts for about 10% of the cost of power batteries – 20%.
The separator is located between the positive and negative electrodes of the lithium battery. Its main function is to separate the positive and negative active materials and prevent the two poles from short-circuiting due to contact. In addition, during the electrochemical reaction, the separator can also maintain the necessary electrolyte to form a path for ion movement. aisle.
The future development of battery material
The future development of battery materials is a dynamic and evolving field, driven by the demand for more efficient, safer, and sustainable energy storage solution. Here are several key perspectives on the future development of battery materials：
Advancements in Cathode Materials:
Ongoing research aims to develop cathode materials with higher energy density, faster charging capabilities, and reduced reliance on scarce or environmentally challenging elements like cobalt. Materials like lithium iron phosphate (LFP), lithium nickel oxide (LiNiO2), and advanced NMC compositions are under exploration.
Anode Material Innovations:
Silicon anodes, with their high theoretical capacity, are a focus for research, although challenges related to volume expansion during cycling need to be addressed. Lithium metal anodes, if successfully developed, could significantly increase energy density.
Electrolyte Enhancements:
Development of advanced electrolytes, including solid-state electrolytes, polymer electrolytes, and electrolyte additives, is ongoing. Enhanced electrolytes can contribute to improved safety, wider temperature ranges, and better performance under various conditions.
The future development of battery materials is likely to be shaped by a combination of factors, including advancements in materials science, sustainability considerations, and the evolving demands of various applications.
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