Overview of development of Lithium battery electrolyte,
Lithium battery electrolyte,

▍Vietnam MIC Certification

Circular 42/2016/TT-BTTTT stipulated that batteries installed in mobile phones, tablets and notebooks are not allowed to be exported to Vietnam unless  they are subjected to DoC certifctaion since Oct.1,2016. DoC will also be required to provide when applying Type Approval for end products (mobile phones, tablets and notebooks).

MIC released new Circular 04/2018/TT-BTTTT in May,2018 which stipulates that no more IEC 62133:2012 report issued by overseas accredited laboratory is accepted in July 1, 2018. Local test is necessity while applying for ADoC certificate.

▍Testing Standard

QCVN101：2016/BTTTT（refer to IEC 62133：2012)

▍PQIR

The Vietnamese government issued a new decree No. 74/2018 / ND-CP on May 15, 2018 to stipulate that two types of products imported into Vietnam are subject to PQIR (Product Quality Inspection Registration) application when being imported to Vietnam.

Based on this law, the Ministry of Information and Communication (MIC) of Vietnam issued the official document 2305/BTTTT-CVT on July 1, 2018, stipulating that the products under its control (including batteries) must be applied for PQIR when being imported into Vietnam. SDoC shall be submitted to complete the customs clearance process. The official date of entry into force of this regulation is August 10, 2018. PQIR is applicable to a single import to Vietnam, that is, every time an importer imports goods, he shall apply for PQIR (batch inspection) + SDoC.

However, for importers who are urgent to import goods without SDOC, VNTA will temporarily verify PQIR and facilitate customs clearance. But importers need to submit SDoC to VNTA to complete the entire customs clearance process within 15 working days after customs clearance. (VNTA will no longer issue the previous ADOC which is only applicable to Vietnam Local Manufacturers)

▍Why MCM?

● Sharer of Latest Information

● Co-founder of Quacert battery testing laboratory 

MCM thus becomes the sole agent of this lab in Mainland China, Hong Kong, Macau and Taiwan.

● One-stop Agency Service

MCM, an ideal one-stop agency, provides testing, certification and agent service for clients.

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.