Lithium iron phosphate battery
Lithium iron phosphate Battery: Refers to the use of lithium iron phosphate as a cathode material lithium ion battery. Its characteristics are no cobalt and other valuable elements, low raw material prices and phosphorus, iron in the Earth's rich resources, there will be no feeding problems. Its operating voltage is moderate (3.2V), the unit weight under the large capacity (170mah/g), high discharge power, fast charging and long cycle life, in high temperature and high thermal environment stability.
Lithium iron phosphate Battery advantages
The lithium iron phosphate battery has at least five advantages over the more common lithium cobalt and manganese oxide batteries available in the market: higher safety, longer service life, no heavy metals and rare metals (low cost of raw materials), support for fast charging, wide range of operating temperature.
Lithium iron phosphate Battery disadvantage
There are some defects in the properties of lithium iron phosphate, such as vibration density and compaction density is very low, resulting in low energy density of lithium-ion battery, the preparation cost of the material is high, the battery rate of finished productsis low, the consistency is poor, and the product consistency is poor;
Analysis and comparison of lithium titanate battery and lithium iron phosphate
In the field of pure electric vehicles, the battery is lithium iron phosphate or ternary lithium, and recently gree to acquire the silver-long passenger car, its core competitiveness is the alternative lithium titanate battery.
Domestic automobile manufacturers are more than ternary lithium batteries, lithium iron phosphate batteries. Lithium titanate is not yet in scale. and lithium titanate battery price high (high production costs, humidity control requirements), 9 yuan per watt or so, and lithium iron phosphate batteries, ternary lithium batteries per watt of the gap is also very large.
What is the best comparison between lithium titanate battery and lithium iron phosphate? It's also about the performance of both batteries. As we all know, lithium battery performance is mainly determined by positive, negative, electrolyte and diaphragm, of which positive and negative materials on the battery key indicators, such as capacity, energy density, cycle life, safety, magnification performance, cost and so on have important influence.
Lithium titanate battery breaks the traditional battery technical route with graphene as negative electrode, and changes to lithium titanate as anode material, which makes it a heterogeneous in the eyes of the peers. But it is the characteristic of lithium titanate that makes the battery of this material have remarkable characteristic.
For example, lithium iron phosphate-graphene, ternary-titanate lithium batteries, in terms of energy density, lithium titanate battery is at a disadvantage. The Northeast Securities Research newspaper pointed out that the current lithium iron phosphate battery is actually 100-120wh/kg than the energy, in which Tesla used nickel cobalt aluminum ternary battery is to achieve 252wh/kg, and silver titanate lithium battery only 90wh/kg, only some graphite anode material battery half.
Again from the cost, lithium titanate battery has no advantage. At present, the silver titanate lithium battery raw materials including titanium hydroxide and lithium hydroxide, the price is higher than the graphite type anode materials. According to the survey results of China's battery network, the current cost of lithium iron phosphate, ternary batteries in the 1100 yuan/kwh-1200 yuan kwh, and lithium titanate battery cost about 2-3 times the ternary battery.
The energy density is one times lower, the cost is 2-3 times higher, how does lithium titanate battery participate in the market competition? Obviously, it is its own unique advantages to impress some of the industry.
Safety of lithium titanate batteries a solo show
Lithium titanate as a cathode material when the potential platform up to 1.55V, than the traditional graphite anode material higher than 1V, although loss of some energy density, but also means that the battery is more secure. Technical expert Lu Languang has said that when the battery quickly charged to the negative voltage demand is relatively low, but if too low, lithium batteries will easily precipitate a very lively lithium metal, this lithium ion not only conductive, but also with the electrolyte reaction, and then release heat, produce combustible gas, triggering fire. Lithium titanate because of high 1V voltage to avoid the negative voltage of 0, but also indirectly avoid the lithium ion precipitation, so as to ensure the safety of the battery.
Because lithium titanate battery can be safely used in high temperature and low temperature environment, it also embodies its important advantages of wide temperature tolerance (especially low temperature). At present, the safe working temperature area of ag-long lithium titanate battery is between 50 and 65 degrees, the ordinary graphite negative battery in the temperature of 20 degrees when the energy began to decay,-30 degrees when the charging capacity of only 14% of the total capacity of the charge, in the cold weather simply can not work.
In addition, the lithium titanate battery, even if overcharge, only 1% of the volume changes, known as 0 strain material, which makes it has a very long life. Wei Bancang, chairman of Banlone, has said that the life of lithium titanate battery can be up to 30 years, and the life of the car is equivalent to the average life of graphite anode material battery for 3-4 years. The cost of lithium titanate batteries is lower than that of the whole life cycle.
The last advantage of lithium titanate is the fast charging and discharging ability and high charge ratio. At present, the charge ratio of lithium titanate battery is 10C, even 20C, and the battery charging rate of ordinary graphite anode material is only 2c-4c.
Based on these technical features of lithium titanate batteries, the industry believes that it fits the needs of new energy buses and large storage equipment. Take a bus, generally a single trip not more than 40 kilometers, each terminal station waiting until the next departure time interval of at least a few minutes. At this time, lithium titanate battery low energy density will not affect the use of buses, but reflects the advantages of battery fast charge. As public transportation, the bus has put forward higher requirements for the safety and durability of the battery.
6 new energy bus with lithium titanate battery into the Ministry of Industry "New energy vehicles to promote the promotion of the list of recommended vehicles" (the fourth batch of 2017), means that the official recognition of the technical maturity of the battery. With the later subsidies put in place, lithium titanate electric bus prices will also fall, the future is expected to continue to pull its sales. In the face of the huge new energy bus market, lithium titanate Enterprises began to expand production.
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