Graphite carbon material anode specific surface area analyzer - Database & Sql Blog Articles

Lithium ion battery is

90

The high-capacity rechargeable battery developed in the era can store more energy than the nickel-hydrogen battery, with higher specific energy, longer cycle life, less self-discharge rate, and no memory effect.

It is gradually moving from the application of mobile phones, notebook computers and digital cameras to electric bicycles and electric vehicles.

from

2009

At the beginning of the year, after the development of new energy vehicles in the country, the domestic lithium battery factories have mushroomed all over the country.

"

blossom everywhere

”

.

At present, there are hundreds of manufacturers of lithium batteries in China, and quite a few of them can produce their own anode materials.

The lithium ion battery anode materials used in the pre-commercial use are all graphite-based carbon materials, including natural graphite, artificial graphite, graphitized mesophase carbon microspheres, and pitch-based carbon fibers.

.

However, the graphite quality and key technologies of different companies are quite different. The powerful enterprises themselves have testing equipment. For example, the specific surface area of ​​graphite of the negative electrode material has a great influence on the quality of lithium ion batteries.

The specific surface area is the surface area per gram of solid material, in units

M2/g

The national standard for specific surface area testers is based on

BET

Theoretical low temperature nitrogen adsorption

BET

Multi-point method

GB/T19587-2004

). Adsorption by nitrogen

BET

The main point of the multi-point method for determining the specific surface area is:

5-30%

In the range of nitrogen partial pressure, the adsorption amount of the adsorbent (the powder to be tested) to nitrogen is measured at different partial pressure points of nitrogen, and an adsorption isotherm is passed.

BET

The specific surface area of ​​the adsorbent can be calculated by formulating the saturated adsorption amount of the monolayer when the surface of the adsorbent is covered with nitrogen molecules to cover the monolayer.

Bested

3H-2000BET-A

The specific surface area measuring instrument is a high-precision analytical instrument based on the national specific surface test standard. It has many domestic leading technologies; such as the only integrated in-situ purge processing function in China, different nitrogen partial pressures for chromatographic specific surface testing. The problem of purging treatment between the points is required to make the purging treatment between different nitrogen partial pressure points more convenient and efficient, and reduce the influence of continuous testing on accuracy; the only program-controlled wind-heat assisting device in China enables the realization of the whole After automation

,

Ensure sharp and fast desorption peaks and reduce background error; the only chromatographic concentration detection system in China, which makes the nitrogen partial pressure detection accuracy increase relative to the flow method

10

Double; six-way valve sampler program control, the only domestic quantitative tube program-controlled switching function; the only domestic particle size report and other functions; the instrument parameter software display, at the same time, the large-screen LCD hardware display on the instrument, making the instrument working state parameters clear at a glance , more reliable operation; and liquid nitrogen temperature monitoring, detector gas shutoff protection, detector thermostat, important parts of the sound prompts, so that

3H-2000BET-A

Compared with the surface instrument, the tester has achieved and surpassed the performance of similar instruments in foreign countries in terms of test accuracy, stability and safety, and ease of operation.

3H-2000

The series than the surface meter has a large number of customers in China, and is a well-known brand than the surface instrument.

The specific surface is a very important parameter of the lithium ion battery material. For example, the specific surface area of ​​graphite is too large, resulting in excessive loss of capacity for the first time, and more binder is added, resulting in an increase in internal resistance. The specific surface area of ​​graphite is related to the shape and surface structure of graphite particles. For example, artificial graphite has a special microporous structure, large specific surface area, increased active sites, increased reaction area, and improved utilization of active materials. Capacity and high rate performance, but

Due to the formation during the first charge and discharge process

SEI

The electrolyte consumed by the membrane is relatively large, so that the irreversible capacity ratio is large. Another advantage of porous carbon materials is that after surface coating, the pore structure inside the material can significantly improve the storage capacity of lithium ions. If the pores are moderate, it is helpful for large rate charging because its pores can be Lithium ions are stored in the pores in the form of lithium ion clusters without the use of properties called

LiC6.

However, such a tunnel structure is difficult to form. Need technical in-depth research. For graphite anode materials, many researchers use carbon dioxide coating by asphalt and resin pyrolysis to form a core.

-

The shell structure reduces the specific surface area of ​​the graphite and improves the compatibility with the electrolyte. Too large or too small a specific surface area of ​​graphite particles is detrimental to the reversible deintercalation of lithium ions, and only a suitable specific surface area can limit the reversible deintercalation of lithium ions.

If you want to measure the pore size of the graphite anode material, you can use Besider's

3H-2000PS

Series static capacity method fully automatic surface and aperture analyzer, for

500nm

The following micropore tests are very accurate. The instrument has an independent

PO

The test station ensures the high accuracy of the partial pressure test and the objective and real adsorption and desorption isotherms; the purification pretreatment also has two modes: molecular replacement and ordinary heating and vacuum molecular diffusion. The molecular replacement mode is relative to the molecular diffusion mode efficiency. improve

1

More than half of the time can save more than half of the pretreatment time, and solve the problem of long preparation time of the static method.

Besderby surface analyzers have been in volume sales for many years in the battery industry.

80%

The above battery manufacturers all purchase Bethes's instruments, because the specific surface area of ​​the battery materials is relatively small, and the patented technologies such as wind-heat assisted and gas-removed to ensure the accuracy of the tests, Besider The specific surface meter has a lot of practical experience in battery materials, and the test results are very accurate. Many of the performance indicators surpass imported instruments. It is a model of high-precision surface-surface instruments in China. Beside's specific surface meter is consistently affirmed by customers. Recognition.

Bethes Instruments warmly welcomes users to visit, sample and select models.

we

Commitment to provide customers with the most professional and best service, from the moment we learn about your needs, we will go all out to provide you with full support. The one-stop service team consisting of sales engineers, technical experts and after-sales service experts will focus on ensuring the safe and reliable operation of the instruments and equipment, and give full play to their excellent performance, making these instruments a useful assistant in scientific research and experimental tasks.

In short, we will, as always, spare no effort to build a more professional and efficient team and adhere to the principle of honesty.

,

Customer-oriented philosophy, think what customers want

,

Urgent customers are eager to improve customer satisfaction in all aspects, work with you to promote the torrent of scientific and technological progress in China, and keep moving forward!

Bethed Instrument Technology (Beijing) Co., Ltd. is one of the earliest professional companies engaged in research, development, production and sales of nitrogen adsorption specific surface area analysis instruments. It is a high-tech enterprise recognized by Beijing Zhongguancun Science and Technology Park.

Currently has ten items

Specific surface area analyzer

The technology patent is the manufacturer with the most patented technology in the same industry in China. It has strong R&D and innovation capabilities, and many technical patents are specially used to improve the accuracy and stability of the instrument.

In 2012, it stood out among hundreds of thousands of companies, and was selected by the Ministry of Science and Technology as a technology-based SME technology innovation fund support enterprise. Special funds were invested in the research and development and update of instruments, thus launching a new generation of instruments to enable the development of enterprises to enter new Stage.

With hundreds of successful users, including many colleges, research institutes and well-known companies, instrument sales have been far ahead of

In 2009, the company passed the ISO9001 certification and has a complete sales, training and service system. It has an efficient and professional team to provide customers with quality equipment and first-class service.

The professional R&D team has been developed for 1 year, and many industry experts have participated in the international frontier design concept, integrated valve and pipeline design, full modular assembly, high vacuum and high stability, and superior performance compared to imported high-end equipment.

Professional and perfect after-sales service system, can provide 24-hour telephone consultation, 48-hour in-door service, Beijing, Shanghai, Guangzhou have service agencies to fully protect the normal operation of user equipment.