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LG Energy Solution has made several key advancements in solid-state battery technology, focusing on improving safety, energy density, charging speed, and manufacturability:
- Long-life All-Solid-State Battery with Micro-Silicon Anode (2021): In collaboration with the University of California, San Diego, LG Energy Solution developed a “long-life all-solid-state battery” that overcame the prior limitation requiring charging temperatures of at least 60°C. This innovation enabled fast charging at room temperature (~25°C) by using a micro-silicon anode with particle sizes around 5 micrometers. Despite silicon anodes typically suffering from volume changes causing performance degradation, their battery maintained over 80% capacity after more than 500 charge-discharge cycles and improved energy density by over 40% compared to conventional lithium-ion batteries. This research was published in the journal Science, gaining global recognition.
- Development of Solid Electrolyte Membranes Using Advanced Polymers: LG Energy Solution partnered with Kumho Petrochemical to develop a solid electrolyte membrane incorporating styrene-butadiene-styrene (SBS) copolymer. By optimizing the styrene ratio in the polymer, their patented membrane enhances the performance of solid-state batteries, marking a notable step towards commercialization.
- Advancement in Anode-Free Solid-State Battery Technology: Collaborating with Professor Shirley Meng at the University of Chicago, LG Energy Solution introduced a breakthrough method to control the grain growth of soft metals like lithium via a specially designed interfacial layer. This technology promotes uniform electro-deposition, which can increase charging speed by more than tenfold and significantly enhance safety. The anode-free design also maximizes energy density by reducing battery weight and volume, representing a revolutionary improvement in battery architecture.
- Scaling Up with Pilot Production Lines: LG Energy Solution is planning to establish pilot production lines for lithium-sulfur all-solid-state batteries and dry electrode technologies in 2025, reflecting their commitment to scale solid-state battery manufacturing while optimizing capital expenditures.
Overall, LG Energy Solution’s key advancements revolve around enabling fast room-temperature charging, increasing cycle life and energy density, improving safety through better interface engineering, adopting innovative polymer electrolytes, and progressing towards scalable production for next-generation solid-state batteries.
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