Big news: Cylindrical lithium iron phosphate battery exceeds 300Wh/kg

On April 27, the 16th Chongqing International Battery Technology Exchange Conference/Exhibition, one of the world's largest battery industry events, opened grandly at the Chongqing International Expo Center. This exhibition focused on the innovation and development of new battery technology, energy storage technology, and battery materials.

It is worth noting that the cylindrical lithium iron phosphate battery with a capacity of over 300Wh/kg exhibited by Guangna Mingshang New Energy Technology (Suzhou) Co., Ltd. attracted a lot of attention. (Booth number: N4T115, Hall 4, Gate 6)

It is understood that Guangna Mingshang New Energy Technology (Suzhou) Co., Ltd. focuses on the research and development and industrialization of high-energy, high-power, ultra-low temperature solid-state batteries and key materials, and its core technology has independent intellectual property rights.

Since its establishment, the company's team has been continuously researching, developing and innovating, and has overcome the application of ultra-thin, ultra-high capacity, 3D structured current collector (no negative electrode) technology and "in situ" synthetic electrolyte technology in solid-state batteries, solving a series of pain points currently faced by solid-state batteries. This is a major breakthrough in solid-state batteries.

Chairman Dr. Dong Ming gave a detailed introduction to the cylindrical lithium iron phosphate solid-state battery structure with a capacity of over 300Wh/kg.

The 4680 lithium iron phosphate solid-state battery uses Guangna Mingshang's second-generation GA-2 model ultra-thin, ultra-high capacity, high-porosity 3D structure current collector as the negative electrode. The electrode thickness is only 36μm, the porosity exceeds 93%, the surface density is <2g/m2, and the reversible lithium storage capacity exceeds 17Ah/g (approximately 50 times the reversible lithium storage capacity of graphite).

The CNTp-3D "honeycomb" structure with high porosity and high specific surface area inside the negative electrode has ultra-high thermal and electrical conductivity, ensuring the high energy density and high power density characteristics of the battery, achieving zero change in the volume of the battery cell, and effectively suppressing negative electrode lithium dendrites, greatly improving battery safety and the reliability of system integration.

The positive electrode adopts in-situ composite of positive electrode and solid electrolyte, which effectively solves the problem of ion and electron conductivity between solid electrolyte, active material and current collector, and is suitable for dry preparation.

In terms of cost, the cost of monomer materials, processes, and system integration is reduced by more than 30% compared to graphite and silicon-carbon negative electrodes.

Using the same negative electrode solution, the company is also developing Li-S all-solid-state batteries with an energy density of more than 800Wh/kg.

Regarding product applications, the company has developed multiple systems of solid-state batteries, taking into account automotive and marine power batteries, and large-system energy storage; the company has established partnerships with a number of benchmark customers.

It is reported that the positive and negative electrode structures and working principles of the battery are as follows:

SEM photo of in-situ composite electrolyte cathode

Scanning electron microscope photo of the negative electrode

Scanning electron microscope photo of the negative electrode section

SEM photo of the negative electrode (fully charged)

How Batteries Work

Finally, the Guangna Mingshang exhibition team wishes the CIBF2024 exhibition a great success and welcomes elites from all industries to Guangna Mingshang for exchanges and discussions.