Overview of development of Lithium battery electrolyte,
lithium battery,

▍What is CB Certification？

IECEE CB is the first genuine international system for mutual recognition of electrical equipment safety test reports. NCB (National Certification Body) reaches a multilateral agreement, which enables manufacturers to obtain national certification from other member countries under CB scheme on the basis of transferring one of the NCB certificates.

CB certificate is a formal CB scheme document issued by authorized NCB, which is to inform other NCB that the tested product samples conform to present standard requirement.

As a kind of standardized report, CB report lists relevant requirements from IEC standard item by item. CB report not only provides results of all required testing, measurement, verification, inspection and assessment with clearness and non-ambiguity, but also including photos, circuit diagram, pictures and product description. According to the rule of CB scheme, CB report will not take effect until it presents with CB certificate together.

▍Why we need CB Certification?

1. Directly recognized or approved by member countries

With CB certificate and CB test report, your products can be exported to some countries directly.

1. Convert to other countries certificates

The CB certificate can be directly converted to the certificate of its member countries, by providing the CB certificate, test report and difference test report (when applicable) without repeating the test, which can shorten the lead time of certification.

1. Ensure the Safety of Product

The CB certification test considers the product’s reasonable use and foreseeable safety when misused. The certified product proves the satisfactory of the safety requirements.

▍Why MCM? 

● Qualification: MCM is the first authorized CBTL of IEC 62133 standard qualification by TUV RH in mainland China.

● Certification and testing capability: MCM is among the first patch of testing and certification third party for IEC62133 standard, and has finished more than 7000 battery IEC62133 testing and CB reports for global clients.

● Technical support: MCM possesses more than 15 technical engineers specialized in testing as per IEC 62133 standard. MCM provides clients with comprehensive, accurate, closed-loop type of technical support and leading-edge information services.

In 1800, the Italian physicist A. Volta built the voltaic pile, which opened the beginning of practical batteries and described for the first time the importance of electrolyte in electrochemical energy storage devices. The electrolyte can be seen as an electronically insulating and ion-conducting layer in the form of liquid or solid, inserted between the negative and positive electrodes. Currently, the most advanced electrolyte is made by dissolving the solid lithium salt (e.g. LiPF6) in non-aqueous organic carbonate solvent (e.g. EC and DMC). As per the general cell form and design, the electrolyte typically accounts for 8% to 15% of the cell weight. What’s more, its flammability and optimal operating temperature range of -10°C to 60°C greatly hinder further improvement of battery energy density and safety. Therefore, innovative electrolyte formulations are considered to be the key enabler for the development of the next generation of new batteries.Researchers are also working to develop different electrolyte systems. For example, the use of fluorinated solvents that can achieve efficient lithium metal cycling, organic or inorganic solid electrolytes that are benefit to the vehicle industry and “solid state batteries” (SSB). The main reason is that if the solid electrolyte replaces the original liquid electrolyte and diaphragm, the safety, single energy density and life of the battery can be significantly improved. Next, we mainly summarize the research progress of solid electrolytes with different materials.
Inorganic solid electrolytes have been used in commercial electrochemical energy storage devices, such as some high-temperature rechargeable batteries Na-S, Na-NiCl2 batteries and primary Li-I2 batteries. Back in 2019, Hitachi Zosen (Japan) demonstrated an all-solid-state pouch battery of 140 mAh to be used in space and tested on the International Space Station (ISS). This battery is composed of a sulfide electrolyte and other undisclosed battery components, being able to operate between -40°C and 100°C. In 2021 the company is introducing a higher capacity solid battery of 1,000 mAh. Hitachi Zosen sees the need for solid batteries for harsh environments such as space and industrial equipment operating in a typical environments. The company plans to double the battery capacity by 2025. But so far, there is no off-the-shelf all-solid-state battery product that can be used in electric vehicles.