A new direction for the development of positive electrode: lithium manganese iron phosphate (olivine structure)

There are mainly four kinds of olivine phosphate LiMPO4 (M represents metal, mainly iron Fe, nickel Ni, manganese Mn and cobalt Co); The voltages are 3.4~3.5V (iron), 5.0~5.4V (nickel), 4.0~4.2V (manganese) and 4.7~4.8V (cobalt) respectively. At the same time, the four phosphates can be doped with each other to form multiple olivine series materials. The charge-discharge curves and cyclic voltammetry curves of the multi-element system can be simply regarded as the linear superposition of the charge-discharge curves and cyclic voltammetry curves of the four separate olivines. Since the voltage of lithium nickel phosphate exceeds the current upper limit of electrolyte stability, cobalt is not the main constituent element. On the contrary, manganese is friendly to the environment, and the working voltage of lithium manganese phosphate is ideal (at 4.1V), which can be matched with the existing commercial electrolytic solution.

2023-06-20

A new direction for the development of the positive electrode: lithium nickel manganese oxide (spinel structure 5V cathode material)

Among the high voltage 5V cathode materials with spinel structure, lithium nickel manganate (LiNi1-xMnxO4) has good stability. The actual discharge capacity of LiNi0.5Mn1.5O4 is about 140mA h/g, which is close to the theoretical capacity. The charge and discharge platform is about 4.7V. At the same time, LiNi0.5Mn1.5O4 is simple to synthesize and is one of the mainstream directions of cathode development.

2023-06-20

The global new energy vehicle market is developing rapidly, lithium iron phosphate battery has become the mainstream of the power battery market, as an upgraded product of lithium iron phosphate, the new phosphate cathode material market space is broader.

In recent years, the global climate problem has become increasingly serious. In order to reduce air pollutant emissions, more and more countries have begun to vigorously develop new energy vehicles, and the global new energy vehicle industry has developed rapidly. According to EVTank statistics, global sales of new energy vehicles will reach 10.824 million in 2022, up 61.6 percent year-on-year. China has also further accelerated the industrialization process of new energy vehicles, promulgated a series of relevant policy documents, and vigorously supported the healthy and rapid development of new energy vehicles and all links of the industrial chain. The domestic new energy vehicle industry has gradually developed and matured, and the market scale has continued to expand. Data from China Automobile Industry Association show that China's new energy vehicles in 2022

2023-06-20

Cathode material is an important factor in determining battery performance

The cathode material is the source of lithium ions and determines the performance of lithium ion batteries. Cathode material is a decisive factor in the electrochemical performance of lithium batteries, which directly determines the energy density and safety of the battery, and then affects the overall performance of the battery. Since the cathode material accounts for more than 40% of the cost of lithium battery materials, its cost also directly determines the overall cost of the battery, so the cathode material plays an important role in the lithium battery, and directly leads the development of the lithium battery industry.

2023-06-20

Lithium manganese iron phosphate: a "good companion" for ternary materials"

Lithium manganese iron phosphate can make up for the short board of lithium iron phosphate and ternary materials at the same time, so it is regarded as a potential alternative material for lithium iron phosphate and ternary 5 series. One of the reasons for the low energy density of lithium iron phosphate batteries is the low voltage. After adding manganese, the battery voltage can be increased from 3.4V to 4.1V, and the energy density can be increased by 15-20%, and it has better low temperature performance.

2023-06-20

What are the manganese raw materials of lithium manganese iron phosphate

With the rapid rise in demand for new energy vehicles, rising raw material prices, some of the original battery system has been close to the theoretical extreme value of the case, battery plants and positive plant can be from the technical level can improve the energy density of the program to further enhance the degree of desire. Previously, due to the performance of lithium manganese phosphate and production difficulties and other issues for a long time, but the energy density of lithium iron phosphate battery close to the extreme value to manganese lithium battery technology breakthroughs and other factors resonance, a number of manufacturers because of its economy and began to pay attention to lithium manganese phosphate.

2023-06-20

Comparison of performance characteristics of lithium manganese iron phosphate

In the current field of power batteries, the mainstream application materials are olivine structure of lithium iron phosphate and layered ternary nickel cobalt manganese material (NCM), and lithium manganese iron phosphate as a positive development material based on lithium iron phosphate, its performance compared to the two have advantages and disadvantages. Compared with lithium iron phosphate, the high voltage characteristic of manganese enables lithium manganese iron phosphate to have a higher voltage platform, which also leads to a higher energy density when the specific capacity is the same, and the energy density is higher than that of lithium iron phosphate under the same conditions. 10%-20%, but the disadvantage is that the introduction of manganese significantly reduces the conductivity of the material. At the same time, a higher voltage platform also means higher requirements for electrolytes, and relatively few types of electrolytes meet the discharge characteristics.

2023-05-22

The difference between lithium-ion battery and ternary lithium battery

The differences between lithium-ion batteries and ternary lithium batteries are: different properties, different materials, different applications, different battery capacity, and different discharge power. The properties are different: lithium-ion batteries are lithium-ion batteries with lithium iron phosphate as the cathode material, and ternary lithium batteries are lithium batteries. The cathode material of lithium batteries is nickel-cobalt-manganese oxide or nickel-cobalt-lithium aluminate ternary cathode material. Different materials: Lithium-ion battery cathode materials mainly include lithium cobalt acid, lithium manganese acid, lithium nickel acid, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the cathode material of most lithium-ion batteries, and the ternary lithium battery cathode The material is made of nickel salt, cobalt salt, and manganese salt. The ratio of nickel, cobalt, and manganese can be adjusted according to actual needs.

2023-05-22

Interpretation of lithium manganese iron phosphate

Lithium manganese iron phosphate is a mixed product of lithium iron phosphate and lithium manganese phosphate, which has the same structure as lithium iron phosphate and is an ordered and regular olivine structure. Lithium manganese iron phosphate and lithium iron phosphate have the same advantages of low cost, high safety performance, high thermal stability, no spontaneous combustion due to acupuncture and overcharge, long life, safety and no explosion risk. It can be said that it has the advantages of lithium iron phosphate and lithium manganese phosphate, and can also make up for the short board of low energy density of lithium iron phosphate, so it is also known as "the upgraded version of lithium iron phosphate".

2023-05-22