The factors restricting the development of battery energy density -Lithium - Ion Battery Equipment
Lithium -ion battery manufacturers analyze the factors of the energy density development of lithium -ion batteries. Energy density is the biggest bottleneck restricting the current development of lithium -ion batteries. The energy density of lithium -ion battery refers to the energy released by the average unit volume or quality. Generally, the more electricity is released, the longer the single charging battery life of the battery. The electrode comparison, discharge platform, battery thickness, battery width and battery length are all influencing factors of lithium -ion battery energy density.
Lithium ion battery manufacturers analyze the factors of the energy density development of lithium -ion battery energy density
From lead -acid batteries, nickel -cadmium batteries, nickel -hydride batteries, to lithium ion batteries, the energy density produced by lithium -ion battery manufacturers has been continuously increased. However, the speed of improvement is related to the development speed of the industrial scale, and it seems too slow about human demand for energy. In response to the status quo of energy density becoming bottlenecks, countries around the world have formulated relevant lithium -ion battery industry policy goals, hoping to lead the lithium -ion battery industry to make significant breakthroughs in terms of energy density.(Lithium - Ion Battery Equipment)
The charging and discharge rate of lithium -ion batteries determines the speed of storing and release energy as an energy storage device, which directly affects the power of electric vehicles and the time required for charging. If the charging time of electric vehicles can be at the same level as the refueling time of traditional fuel vehicles, it will inevitably speed up the popularity of electric vehicles, so the improvement of the percentage performance is particularly important.
The existing lithium -ion battery negative materials are mostly graphite, and the unit capacity of graphite is nearly 400mAh/g. It is related to graphite. The unit capacity of the positive electrode material of the lithium -ion battery is much less. Essence According to the theory of wooden barrels, the water level is determined at the shortest point of the barrel. Then, the energy density of the lithium -ion battery is more determined by the positive pole material. Therefore, when the lithium -ion battery is updated, the selected high -energy density materials also need to have a good multiplier performance.
Method of increasing the energy density of lithium -ion battery
The energy density of improving lithium iron phosphate cells is a systematic engineering. It is necessary to start with the aspects of improving the manufacturing process, improving the performance of existing materials, and the development of new materials and new chemical systems. Essence
① Improve the proportion of positive active substances
Increasing the proportion of positive active substances is to increase the proportion of lithium elements. In the same battery chemistry system, the content of lithium element has been unchanged (other conditions remain unchanged), and energy density will also increase accordingly. So under a certain amount of volume and weight, we hope that there are more active substances and more.
② Increase the proportion of negative active substances
This is actually to cooperate with the newly added positive active substances. More negative active substances must be used to accommodate the lithium ion and store energy. If the negative active substances are not enough, the extra lithium ion will be deposited on the negative surface, not embedded inside, and irreversible chemical reactions and lithium ion battery capacity will be attenuated.
③ Increase the ratio of positive and negative pole materials
In the case of a certain amount of positive active substances, only as many lithium ions are dehydrated from the positive pole as much as possible, and participating in chemical reactions can we improve the energy density. Therefore, we hope that the quality proportion of lithium ions that can be removed from the positive active substances is higher, which is higher than the capacity index. If the comparison capacity of the negative electrode is further enhanced, it means that the negative electrode material with less quality can accommodate more lithium ions, thereby achieving the goal of improving energy density.
It is precisely because the energy density of lithium ion batteries is getting larger and larger, and the problems such as thermal reactions inside the lithium -ion battery cannot be better solved and controlled, thereby adding the probability of new electric vehicles to occur. Based on this, experts suggest that policies should not be urgently required to increase energy density of lithium -ion battery, respect the laws of technology development, and reserve sufficient verification time for technological upgrades.
Lithium ion battery manufacturers analyze the factors of the energy density development of lithium -ion battery energy density
From lead -acid batteries, nickel -cadmium batteries, nickel -hydride batteries, to lithium ion batteries, the energy density produced by lithium -ion battery manufacturers has been continuously increased. However, the speed of improvement is related to the development speed of the industrial scale, and it seems too slow about human demand for energy. In response to the status quo of energy density becoming bottlenecks, countries around the world have formulated relevant lithium -ion battery industry policy goals, hoping to lead the lithium -ion battery industry to make significant breakthroughs in terms of energy density.(Lithium - Ion Battery Equipment)
The charging and discharge rate of lithium -ion batteries determines the speed of storing and release energy as an energy storage device, which directly affects the power of electric vehicles and the time required for charging. If the charging time of electric vehicles can be at the same level as the refueling time of traditional fuel vehicles, it will inevitably speed up the popularity of electric vehicles, so the improvement of the percentage performance is particularly important.
The existing lithium -ion battery negative materials are mostly graphite, and the unit capacity of graphite is nearly 400mAh/g. It is related to graphite. The unit capacity of the positive electrode material of the lithium -ion battery is much less. Essence According to the theory of wooden barrels, the water level is determined at the shortest point of the barrel. Then, the energy density of the lithium -ion battery is more determined by the positive pole material. Therefore, when the lithium -ion battery is updated, the selected high -energy density materials also need to have a good multiplier performance.
Method of increasing the energy density of lithium -ion battery
The energy density of improving lithium iron phosphate cells is a systematic engineering. It is necessary to start with the aspects of improving the manufacturing process, improving the performance of existing materials, and the development of new materials and new chemical systems. Essence
① Improve the proportion of positive active substances
Increasing the proportion of positive active substances is to increase the proportion of lithium elements. In the same battery chemistry system, the content of lithium element has been unchanged (other conditions remain unchanged), and energy density will also increase accordingly. So under a certain amount of volume and weight, we hope that there are more active substances and more.
② Increase the proportion of negative active substances
This is actually to cooperate with the newly added positive active substances. More negative active substances must be used to accommodate the lithium ion and store energy. If the negative active substances are not enough, the extra lithium ion will be deposited on the negative surface, not embedded inside, and irreversible chemical reactions and lithium ion battery capacity will be attenuated.
③ Increase the ratio of positive and negative pole materials
In the case of a certain amount of positive active substances, only as many lithium ions are dehydrated from the positive pole as much as possible, and participating in chemical reactions can we improve the energy density. Therefore, we hope that the quality proportion of lithium ions that can be removed from the positive active substances is higher, which is higher than the capacity index. If the comparison capacity of the negative electrode is further enhanced, it means that the negative electrode material with less quality can accommodate more lithium ions, thereby achieving the goal of improving energy density.
It is precisely because the energy density of lithium ion batteries is getting larger and larger, and the problems such as thermal reactions inside the lithium -ion battery cannot be better solved and controlled, thereby adding the probability of new electric vehicles to occur. Based on this, experts suggest that policies should not be urgently required to increase energy density of lithium -ion battery, respect the laws of technology development, and reserve sufficient verification time for technological upgrades.
