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Svolt unveils true solid-state EV battery with energy density that allows over 620 miles on a charge

The 20Ah solid-state battery cell has passed all torture tests (image: Svolt)
The 20Ah solid-state battery cell has passed all torture tests (image: Svolt)
The new solid-state battery contestant has been created with the challenging sulfide technology that has allowed Svolt to create both a solid electrolyte and separator. This resulted in an all-solid-state battery pack with up to 400 Wh/kg energy density, unlike the solid-liquid hybrids that NIO and Dongfeng chose to put in their electric cars.

A research offshoot of the largest SUV maker in China - Great Wall - has created a solid-state battery cell that can reach 350-400 Wh/kg energy density. According to Svolt Energy, the pack is the first all-solid-state sulfide battery in the 20 Ah class that will allow electric vehicles equipped with its cells to run 1000km (620+ miles) on a charge. The advantages of a solid-state battery are numerous, but chief among them is the cell's endurance.

Svolt says the new battery technology has passed its torture chamber tests with flying colors, including the nail puncture and thermal runaway ones. The hot-box test was done at 200 degrees Celsius (392 degrees Fahrenheit). For comparison, the first cars with battery that has solid electrolyte diaphragm, what its maker Ganfeng Lithium calls a semi-solid state cell, have had their units pass a 180 degrees Celsius (365 degrees Fahrenheit) hot-box test. The hard-to-master sulfide material technology has been developed by Svolt in-house, and now the battery researchers have patents on both solid electrolyte and diaphragm production, for an all-solid-state battery.

Recently, Svolt settled a lawsuit with the world's largest EV battery maker CATL over employee poaching. CATL was of the opinion that solid-state batteries won't be mass-produced before 2030, but recent advancements by smaller and nimbler competitors may force it to reconsider that timeframe.

When NIO turned to CATL with an offer to scale a 150 kWh solid-liquid hybrid battery pack that will allow the top version of its ET7 performance sedan to surpass the 620-mile range threshold on a charge, CATL balked at the prospect, saying it barely has resources to scale existing technologies with numerous clients knocking on its door. NIO then went to WeLion and developed the semi-solid battery for the ET5 and ET7 sedans with the startup, forcing CATL to reconsider its decision and invest into high-nickel battery development.

There are now other companies like Gotion that are ready for pilot mass production of solid-liquid hybrid batteries as soon as this year. We can now add Svolt to the short, but growing list of companies that may have cracked the production and development code for the next generation of electric vehicle batteries sooner than expected.

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Svolt Energy testing its all-solid-state battery cells
Svolt Energy testing its all-solid-state battery cells

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2022 07 > Svolt unveils true solid-state EV battery with energy density that allows over 620 miles on a charge
Daniel Zlatev, 2022-07-20 (Update: 2022-07-20)