Volkswagen, whose drive to develop a solid-state electric car battery with the U.S. startup QuantumScape has been dogged by delays, is holding talks with France's Blue Solutions on the technology, a source with direct knowledge of the discussions told Reuters.
Blue solutions, which is a unit of the French conglomerate Bollore, already produces solid-state batteries for Daimler electric buses.
VW and Blue Solutions aim to reach a joint development agreement in the coming months on adapting the technology for cars, according to the source who asked not to be identified as the talks are private.
VW's move to widen its options in the field points to the array of technical hurdles holding back wider development of solid-state technology, seen by its backers as a key step in the progression of EV batteries.
Solid-state batteries promise longer driving ranges and shorter charging times than traditional lithium-ion packs.
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VW said its venture with QuantumScape was on track and declined to comment when asked about any discussions with Blue Solutions.
A spokesperson for Blue Solutions confirmed that it was working on a battery for passenger cars and said it had signed development deals with BMW and another company, and was in talks with a third, but declined to identify the others.
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The company produced the full-electric BlueCar, a stainless-steel bodied hatchback that was designed by Pininfarina and was used in AutoLib, an early car-sharing program in Paris.
Its solid-state battery technology is called lithium metal polymer. Blue Solutions has installed the batteries in electric buses and recently signed an agreement with the Taiwan electronics giant Foxconn to develop its fourth-generation solid-state batteries for use in two-wheelers.
VW, Toyota, BMW and other global automakers are vying to crack the problems of solid-state batteries, which remain technically elusive despite decades of research and billions of dollars of investment.
"A lot of promises have not been delivered and several automakers and investors have been burnt," said Rory McNulty at consultancy Benchmark Mineral Intelligence. "There is loads of really good, verified data and technology, but can they (the industry) do it reliably, at scale?"
Blue Solutions, for its part, faces stiff challenges to radically bring down the four-hour charging time required by its current batteries, which is feasible for buses parked overnight in depots.
The company's spokesperson told Reuters it was working on a passenger car battery with a charging time of 20 minutes and aimed to construct a "gigafactory" for it by 2029.
The sector's lack of commercial success has dampened market enthusiasm; the amount of global venture capital deal activity in solid-state battery companies fell 72 percent last year to $146 million, according to data from PitchBook.
"Investor interest in solid state batteries has waned. They are questioning whether the risk of solid state is worth it," Ibex Investors partner Jeff Peters said.
DEVELOPING SOLID-STATE BATTERY TECHNOLOGY
Companies developing solid-state batteries include:
QuantumScape. Its semi-solid-state cell with no anode uses lithium metal, a ceramic separator and liquid electrolyte. This could boost an EV's driving range from 350 miles (563 km) to 400-500 miles, an increase of 14% - 43% over lithium ion batteries. The company has deals with six automakers including VW.
Blue Solutions is developing a product for cars that uses a polymer electrolyte and ultra-thin lithium metal anode, aiming for a charging time of less than 20 minutes with a range increase of about 30 percent to nearly 620 miles (1,000 km). The company produces solid-state batteries for buses with a charging time of four hours.
Toyota aims to launch a battery with a range of 1,000 km and a charging time of 10 minutes in 2027-28.
ProLogium Technology is working on semi-solid-state batteries that enable a near doubling of the energy densities of its current packs. The supplier has deals with Mercedes-Benz, Stellantis and TotalEnergies.
Nio uses 150-kWh semi-solid-state batteries made by Beijing Welion New Energy. These have a range of up to 1,000 km.
Ganfeng LiEnergy's semi-solid-state batteries power China's Seres brand's EVs, such as the Seres 5 SUV which has a range of 530 km, with a charge time of 50 minutes.
CATL last year unveiled a condensed matter battery, a type of semi-solid-state battery it said could supply enough energy to power electric passenger aircraft.
Solid Power delivered test cells of its semi-solid-state battery with a sulfide-based solid electrolyte and a high-content silicon anode to BMW last year. Ford, BMW, Hyundai and SK Innovation are investors.
Factorial Energy delivered prototype of its semi-solid-state battery to automaker partners last year for testing. It has agreements with Mercedes, Stellantis and Hyundai.
LG Energy Solution aims to develop polymer-based and sulfide-based solid-state batteries by 2026 and 2030 respectively.
Samsung is developing a solid-state battery without an anode, with mass production expected in 2027.
Nissan plans to launch an EV with solid-state batteries developed in-house by 2028.
'Work to do'
Solid state ideally envisions replacing the liquid electrolyte though which the electrical charge passes in lithium ion EV batteries with a solid substitute, thus reducing a fire hazard and shrinking the size of battery packs and using lithium metal for its negative terminal to boost performance.
Gauging precisely the right combination of chemicals and materials so they do not react adversely with each other is difficult, though.
QuantumScape's venture with its top shareholder VW, which has invested $300 million in the startup, is an example how solid-state technology has failed to live up to its initial promise.
The development deal signed in 2018 envisaged solid-state powering VW EVs by 2025, enabling the e-Golf to more than double its range to 750 km (466 miles).
When QuantumScape subsequently went public via a reverse merger with a special purpose acquisition company in New York in 2020, it said it was aiming for commercial battery production in 2024.
Yet mass commercial production remains a distant prospect, even after QuantumScape shipped its first prototypes to VW and other prospective customers in late 2022, the start of what is typically a multi-year process of testing and certification.
Furthermore, the battery is not pure solid state since it uses a liquid electrolyte though uses ceramic to separate the positive and negative terminals.
"We still have a lot of work to do," QuantumScape's CEO Jagdeep Singh told Reuters. "The prototype is meant to show the core functionality is there, not that the cell is fully ironed out in terms of all the different defects that can be introduced during the production process."
QuantumScape's shares, which hit a peak of $132.70 in December 2020, have since sunk to $7.37, giving the company a market value of about $3.6 billion.
The supplier has not said when it expects high-volume commercial production. Goldman Sachs said this was likely in the latter part of the decade.
QuantumScape said in a regulatory filing to the U.S. Securities and Exchange Commission last October that it had missed commercialization timeline milestones envisaged in the 2018 deal with VW, and that the German automaker thus had the right to terminate the joint venture should it choose to.
Toyota flags breakthrough
VW and QuantumScape are not the only players that have pared their ambitions as they grapple with the technical complexities of solid state.
Toyota had targeted a 2025 production startup date for its solid-state batteries, but said in June it now does not expect to produce the cells at scale before 2027 or 2028.
The Japanese company nonetheless said it had achieved a technical breakthrough, without providing details beyond a projected driving range of 750 miles (1,207 km) or more and charging time of 10 minutes.
A number of other other companies have plans to roll out solid-state batteries including Chinese battery leader CATL, LG Energy Solution, Solid Power, ProLogium, Honda and Nissan (see factbox, above).
EV market leader Tesla is an industry outlier in not having detailed any solid-state battery development plans.
A key issue solid-state scientists have been grappling with is the impact of introducing lithium metal for the anode.
Lithium metal can dramatically lift performance, but often sparks reactions with the solid compounds, including creating dendrites, spiky formations that create cracks and imperfections and can ultimately short-circuit a battery.
Battery makers, automakers and researchers have tried using a variety of substances for the solid electrolyte in three main categories: polymers, sulfides and oxides.
Some companies have already rolled out partial versions of solid-state batteries that offer some benefits of the technology. China's EV companies Nio and Seres have both launched EV models with "semi-solid-state" batteries which have both solid and gel-like electrolyte components but do not use lithium metal anodes.
Vw ha già da diversi anni un’ alleanza con Quantumscope per lo sviluppo di batterie allo stato solido ma i ritardi stanno costringendo a cercare nuove fonti per un tipo di batterie che potrebbe rivoluzionare il mondo delle BeV. Si otterrebbero batterie meno costose e più efficienti, certo le stime variano in maniera significativa. Ad esempio Tesla non ci sta investendo.
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