Comparison between ternary battery and lithium battery

As for lithium cobalt acid, it is easy to collapse structure after lithium disembedding for more than a half. The theoretical specific capacity under 2754.2 V generally is between 140-145 before someone did cobalt acid lithium capacity under 4.35 V between 155-160 mah/g. It can be seen from these values that cobalt acid lithium rises capacity under high voltage, but also has more disembedding lithium than its structural stability required amount, so this material is not suitable for high voltage. Currently, high voltage cobalt acid lithium is modification cobalt acid lithium. It costs a lot, but even modified cobalt acid lithium is also difficult to guarantees the stability of a long cycle under 4.4 V. Besides cobalt acid lithium under high voltage advantages, the development of cobalt acid lithium is the longest, so it matches the electrolyte better, and this match is the best control of high temperature gas

Ternary material and cobalt acid lithium contrary structure under 4.5 V in the whole battery are very stable and voltage, the higher the efficiency of its lithium ion embedded off, that is, the higher the efficiency for the first time in 4.35 V g capacity is about 160-165 mAh/g4.5 V can achieve even more than 200 mAh/g and don't need to be modified (of course, the premise is a high-performance ternary those who casually on the market to buy precursor burn is no technical content of three yuan materials are not within this range)

The only downside is that the ternary material under high voltage and cobalt acid lithium instead because it is a relatively new materials and electrolyte matching difficult mainly characterized by high temperature gas but Japan and South Korea and the domestic ATL can have mild package battery very good solution to this problem in the solution of the problem of ternary material surface properties primarily in the control of PH value control and the matching of the electrolyte

Theory of cobalt acid lithium g capacity of more than 270, but now can only do the 145 or so, because only transfer 0.5 mol of electrons

If the transfer is overmuch, the structural framework of cobalt acid lithium will collapse, so cobalt acid lithium can only charged to 4.2 V

And three yuan voltage can be filled up, such as 4.25 V, 4.3 V, 4.35 V. But there is no charge to 4.4 V

Is to keep the ternary material crystal skeleton, but also related to the percentage of nickel cobalt manganese three

Refers to the ternary, the inside of the lithium battery cathode material name. The ternary material is nickel cobalt manganese acid lithium Li (NiCoMn) O?, ternary composite cathode material precursor products, is the cobalt nickel salt, salt, manganese salt as raw materials, in the proportion of nickel cobalt manganese can according to the actual need to adjust, 18650 refers to a cylindrical battery appearance size: 18 means the battery 18.0 mm650 refers to the cell height 65.0 mm in diameter, more for cellphones. Lithium battery is general, the battery on the market are mostly, don't do detailed here

Refers to the ternary, the inside of the lithium battery cathode material name. Regular cobalt acid lithium battery cathode material is LiCoO2, ternary material is nickel cobalt manganese acid lithium Li (NiCoMn) O2, ternary composite cathode material precursor products, is the cobalt nickel salt, salt, manganese salt as raw materials, in the proportion of nickel cobalt manganese can according to the actual need to adjust, the ternary material cell relative to the anode cobalt acid lithium batteries high safety, but the platform is too low, use mobile phones (cell phones as general at around 3.4 V voltage) will feel the lack of obvious capacity.18650 refers to a cylindrical battery appearance size: 18 cell diameter of 18.0 mm650 cell height 65.0 mm more other anode materials used in addition to the three yuan, have cobalt acid lithium, manganese acid lithium, lithium iron phosphate, NCA, etc.

Lithium-ion batteries, refers to a very wide range of categories, those who use lithium materials can be called a lithium battery. According to the scientific name, we say at ordinary times the lithium battery should be called lithium ion batteries/ lithium secondary battery, have corresponding anode materials.

Lithium ion battery anode materials mainly have cobalt acid lithium LiCoO2, LiMn2O4 manganese acid lithium, nickel acid lithium LiCoxNiyMnzO2, ternary material, lithium iron phosphate LiFePO4, etc. The positive use ternary material called ternary lithium batteries;

Ternary lithium battery main advantage is that the energy density is higher than other materials.

The ternary lithium battery cathode material is divided into NCA aluminum nickel and cobalt and sliding nickel cobalt manganese;

Most of the ternary material for sliding, usually we mentioned the ternary lithium battery is sliding. Sliding on behalf of the manufacturer abroad is SDI, SKI in China mainly Lishen, hui tong world, Bick, universal, lang can wait. Tesla's NCA18650 type, NCA relatively strong stability, and cycle performance is strong; But in the process of production, due to Al for amphoteric metal, not precipitation, therefore process exists on the threshold. Due to the NCA chinalco's content is too little, so often referred to as the binary materials.

Ternary material sliding model from 111 three yuan (N: C: M = :) to 433532622811.With nickel content increasing, the battery energy density and the corresponding got ten.

Lithium ion battery after 30 years of development, energy, or power such as improve the performance, has been successfully applied to the car. Restricted by battery than energy, pure electric vehicle range is limited, is restricting the development of the bottleneck, foreign car factory in the near future planning to develop a hybrid car. Currently used in lithium ion battery anode materials are mainly manganese acid lithium, lithium iron phosphate, cobalt acid lithium, ternary material such as material, the use of power type main use lithium iron phosphate battery anode and three yuan two materials. In this paper, using the same battery shell cover, the anode materials and internal structure design, production of lithium iron phosphate and three yuan respectively two kinds of the anode material of battery, comparing two battery energy, or power, cycle, high and low temperature properties, such as performance, analysis of two kinds of battery performance difference.

Experiment 1

1.1 experimental materials selection

The anode material of lithium iron phosphate and nickel cobalt manganese ratio is 1:1:1 the ternary material, choose MCMB anode, electrolyte selects the EC, PC, EMC and mixed solvent composed of DEC, electrolyte for LiPF6 as lithium, diaphragm choose single PP25 microns.

1.2 the preparation of porous membrane electrode and compound thin film electrode

Using rectangular aluminum shell LP2770102 battery shell and cover and inside the same multipolar ear winding structure, in accordance with the battery technology respectively making the anode materials for lithium iron phosphate and ternary material of two kinds of cells. get lithium iron phosphate batteries average capacity, internal resistance, quality were 7.2 Ah, 1.06 m Ω, 361 g; The average battery three yuan material Ah, 1.12 8.6 m Ω, 360 g.

1.3 analysis and testing

Test conditions for: Batteries ternary material charging and discharging voltage control range of 2.5 ~ 4.2 V, 1 c = 7.5 A, lithium iron phosphate battery charging and discharging voltage control range of 2.0 ~ 3.65 V, 1 c = 6.5 Ah, no special specification test temperature (25 + 2) ℃.

2 the results and discussion

2.1 discharge performance testing

From table 1 and figure 1 can be concluded that the same battery size, the anode materials used three yuan higher than using the discharge capacity of lithium iron phosphate 19.4%, 37.5% higher than the energy and discharge 39.7% higher than the power. As specific capacity and quality of the ternary material compaction density were higher than the lithium iron phosphate material, so using the ternary material battery discharge has great advantage.

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