What happened QuantumScape (NYSE: QS) shares jumped almost 20% Thursday morning after the company announced another milestone to keep it on track for commercializing its solid-state battery technology. The stock pared those gains somewhat, but as of 10:45 a.m. EDT, shares remained 11% higher on the day. So what QuantumScape investor and partner Volkswagen (OTC: VWAGY) will add $100 million to its investment in the solid-state battery maker after it met the necessary technical condition for the final payment of a previously announced agreement. Image source: Getty Images. Now what The milestone the company achieved required Volkswagen to perform successful testing of the newest generation of lithium-metal cells in the automaker's German labs. Jagdeep Singh, co-founder and CEO of QuantumScape, said in a statement, "We are delighted to have met this technical milestone with Volkswagen, and we look forward to working jointly to bring solid-state lithium-metal battery technology into industrialized mass-production." The achievement comes after QuantumScape said earlier this year it has successfully built its first multilayer battery cell with four layers. This helps confirm the technology is feasible. The company now has plans to scale up the technology to have an eight- to 10-layer cell by the end of this year. If successfully produced and commercialized, the technology could change the landscape for electric vehicle batteries. The solid-state lithium-metal technology is safer as it doesn't generate the heat of a lithium-ion battery, and it increases charging rate and performance. "Achievement of this milestone is an important step for QuantumScape and we look forward to receiving and testing subsequent generations of cells, with the goal of getting solid-state technology into series production," Frank Blome, head of Volkswagen's battery cell business unit, said in a statement. Investors today are also looking forward to what could be ahead for QuantumScape. 10 stocks we like better than QuantumScape CorporationWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and QuantumScape Corporation wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of February 24, 2021 Howard Smith owns shares of QuantumScape Corporation. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source