Which graphene-based lithium-ion battery is powerful

On February 21st, Beijing Carbon Century Technology Co., Ltd. released the graphene lithium ion No. 5 rechargeable battery, which is the world's first graphene lithium ion rechargeable battery. According to author statistics, from last year to just over half a year this year, Dongxu Optoelectronics, Huawei, Aviation Materials Institute, and Carbon Century have released graphene lithium-ion battery products. It’s really your singer, I’m on the scene, no. Lively, so many graphene lithium-ion batteries are major breakthroughs. Which one is true and which is fake?

1. On February 21, 2017, Beijing Carbon Century released the graphene lithium ion No. 5 rechargeable battery, which is the first graphene lithium ion rechargeable battery in China.

2. On July 8, 2016, Dongxu Optoelectronics released the world's first graphene-based lithium-ion mobile power source in Beijing.

3. On December 1, 2016, Huawei Huawei Research Institute Watt Lab announced at the 57th Japan Battery Conference that it has achieved major research breakthroughs in the field of lithium-ion batteries, and introduced the industry's first high-temperature long-life graphene-assisted lithium-ion battery.

4.On December 8, 2016, the Beijing Aviation Materials Research Institute of China Aerospace disclosed that after five years of unremitting research, a new type of graphene lithium-ion battery with fast charging, long life and low heat has been successfully developed.

So many graphene lithium-ion batteries are major breakthroughs. Which one is true or false, which is superior or inferior?

Carbon century graphene lithium-ion 5 rechargeable battery

Name: Endian Overlord Graphene Lithium-ion Rechargeable Battery Release Time: February 22, 2017

Overview:

Positive material: LFP lithium iron phosphate material;

Negative material: graphene coated lithium titanate material;

Performance parameters:

Size: Battery No. 5(14.5 mm in diameter, 50mm in height)

Use temperature range: -45 °C ~ 60 °C

Cycle life: 30,000 times

Rated voltage: 1.9 V

Capacity: 600mAh

Advantages:

1, long cycle life (30,000 times);

2, wide range of use temperature (-45 °C ~ 60 °C);

3, good safety performance;

Typical application areas:

Electric toys, bright lights, electronic equipment, industrial instruments, uninterruptible power supply, power supply system.

Dongxu Optoelectronics: Graphene-based lithium ion mobile power supply

Name: Alkene (the world's first graphene-based lithium-ion mobile power supply), released: July 8, 2016

Overview:

Positive material: graphene coated with lithium iron phosphate;

Negative materials: graphite carbon materials;

Performance parameters:

Core Size: 18650(diameter: 18mm, height: 65mm)

Use temperature range: -30 °C ~ 80 °C

Cycle life: 3,500 times

Rated capacity: 4800 mAh (4 sections 18650 core)

Charging time: 15 minutes

Advantages:

1, fast charge (15 minutes fast charge and discharge)

1, long cycle life (3,500 times);

2, wide range of use temperature (-30 °C ~ 80 °C);

Official price: 299 yuan

Huawei: High temperature and long life graphene powered lithium-ion batteries

Overview:

Positive material: large single crystal ternary material

Negative material: Not available

Performance parameters:

Use Temperature Range: Increase the upper operating temperature of lithium-ion batteries by 10 °C

Cycle life: 2 times that of ordinary lithium ion batteries, 2000 high temperature cycles at 60 °C, and capacity retention rate still exceeds 70 %; High temperature storage at 60 °C for 200 days with capacity loss less than 13 %

Application: Communications Base Station, Electric Vehicle, UAV

Aviation Institute: graphene-based lithium ion battery

Name: Fast charging, long life, low heat, new type graphene lithium-ion battery

Overview:

The test results showed that under the same conditions, the charging time of the new graphene lithium-ion battery is only one-tenth of that of an ordinary lithium-ion battery, but its service life is five times that of an ordinary lithium-ion battery, and it effectively inhibits the heating problem.

Little ENE said:

Alken Overlord:

Alken storage King Graphene lithium ion rechargeable battery. In addition to its long cycle life and wide temperature range, there are several questions:

1, low energy density. The use of graphene coated lithium titanate as a negative electrode material, the propaganda material pointed out that graphene is used to solve the problem of "gas expansion" of lithium titanate as a negative electrode. This is worth affirming, but its energy density is low. According to the index on the battery, the single battery capacity is 600mAh to calculate, its energy density is quite low. However, it is also relieved to see its application area. Its main goal is to replace the No. 5 dry battery. Most of the occasions used do not require high energy density.

2, the application range is narrow. At a time when the new energy industry is in full swing, the introduction of a rechargeable battery to replace a dry battery seems to be too much. Due to the defect of its energy density, it is destined to be unable to apply to the power cell field. At present, the battery industry is trying to increase the energy density of the environment, slightly conservative.

3, cost issues. At present, the cost of lithium titanate is 40 % higher than that of lithium iron phosphate, which is much higher than that of graphite and other negative materials. The price of the official website of the ENE storage overlord is 39 yuan/section, which is about 10 yuan higher than that of the conventional rechargeable battery No. 5. The price is much higher below 10 yuan. Can be accepted by the market still needs to be tested.

Alken king::

Dongxu Photoelectric King, in common with the olefin storage King, is the addition of graphene to the electrode material of the battery, which improves certain properties. The olefin king is mainly positioned for fast charging, while the olefin storage king mainly improves the circulation. Both the life and the temperature range of use, and the energy density of the battery, both products are unknown, are shortcomings.

There is also a short plate that is a large power adapter. As a mobile power source, small size and portability are important factors that people consider when buying. Obviously, this is not enough to be improved. And its slightly higher price and less bright capacity also limit its competitiveness as a mobile power product.

Huawei:

Huawei's batteries, in which graphene is described as a heat dissipation material, are useful in electrode materials, and other specific performance parameters are also released. Therefore, it can only be called technological progress. It is too early to commercialize applications.

Aviation Institute:

The battery of the Aviation Materials Institute is similar to the olefin king in terms of the released press release. It is also advertised as fast charging, long life and low fever, but there is no specific product disclosure, and no more evaluation can be made.

So how much can graphene do in lithium-ion batteries?

In December 2016, "AdvancedMaterials" has a review article, CriticalInsightintotheRelentlessProgressionTowardGrapheneandGraphene-ContainingMaterialsforLithium-IonBatteryAnodes, DOI:10.1002/adma.201603421, discusses the research status of graphene as a negative electrode material for lithium batteries, the author of the article pointed out that this field is not really Important progress.

1, for graphene applications in batteries, often avoid the emphasis on light. Studies usually focus on mass to capacity, but graphene's porous, low density leads to lower volume than capacity, which is more important in practical applications, and researchers often ignore this. The literature usually attributes the role of graphene to its increased conductivity. However, graphene porous structure is conducive to lithium ion conduction. There is very little attention to this issue. Many literature have never considered this issue in the control group experiment.

2.The results of the publication of the paper are usually half-battery test results, which are extremely misleading. Research on new materials usually uses semi-battery testing, which uses lithium for the electrode metal. However, the energy density and power density of a single electrode are actually meaningless and extremely misleading. In the semi-battery system, charging and discharging voltage and Coulomb efficiency are more important indicators. A more fair and reliable evaluation results can be obtained by testing the whole battery of the material.

3. Graphene has limited advantages as a negative electrode material. Graphene alone as an active material, graphene is superior to commercial graphite anodes in only a few specific aspects (low temperature performance, high power output, etc.). (It is emphasized that graphene applied in this aspect refers to multilayer graphene; single-layer and double-layer graphene cannot be used as anode active materials for lithium ion batteries.) The disadvantage of graphene as a negative electrode for lithium-ion batteries includes its higher potential. Low energy storage efficiency and a large amount of irreversible capacity in the SEI film formation process. Therefore, when graphene is used as a negative electrode, it must be pre-lithiated, which increases the difficulty in manufacturing the battery. The author is not optimistic about the commercialization prospects of pre-lithium technology.

In the end, the author believes that "graphene mania" has brought article irrigation heat in related fields; However, the literature often avoids the real problems facing practical applications: hype about graphene, the use of distorted indicators, and the disregard of key issues, which hinder graphene's application in commercial batteries.

For the above point of view, small ENE is agreed. And there is a very important question. All of the above companies publish the amount or proportion of graphene added to the battery. This will bring about two problems. First, the cost can not be estimated. Does the addition of graphene increase the cost and increase? How much, there is also how much the addition of graphene will affect the final performance of the battery.

All products are ultimately a successful product and need to be tested by good consumers in the market. We do not know exactly what the market response will be after the release of these products. But what we do know is that only products that truly grasp the pain of consumers and solve the problems of today's industry universality can truly survive. Of course, all attempts to consume graphene under the banner of graphene would not last long until a new technology and new material had matured.

The page contains the contents of the machine translation.