Most of you must seen / read it already, I just re-post his conclusion:

Conclusion

May saw lithium prices slightly lower. It looks like a bottom has now been reached.

Highlights for the month were:

• Higher demand boosts China's battery material output.
• Samsung’s Advanced Institute of Technology (SAIT) has revealed a revolutionary solid-state battery that would enable electric vehicles to at least double range. It uses an anode with a new silver-carbon coating known as Ag-C, which is just 5.0 micrometers thick.
• LG Chem bets big on carbon nanotubes.
• SK Innovation to start construction of second EV battery plant in U.S.
• Posco Chemical triples capacity in cathode production to meet EV battery demand.
• LG Chem & Panasonic in tight race to be #1 EV battery supplier.
• Albemarle expresses interest in Tianqi's stake in Greenbushes lithium mine.
• Orocobre - Limited expansion activities recommence at Olaroz.
• Pilbara Minerals Q1 report - "Moderated production strategy, improved recoveries and lower costs ensure strong cash position maintained."
• Altura Minerals Q1 report - "Average quarterly operating cash cost lowered to US$345/wmt produced (FOB basis)...reinforcing Altura’s position as the second lowest cost Australian Producer."
• Neometals making good progress on a Lithium‐ion battery recycling JV, a 20,000tpa LiOH refinery JV in India to help meet India's EV demand, Barrambie Titanium and Vanadium Project JV, and a Vanadium recovery JV. Also strong nickel suplhide drill results at Mount Edwards (recent 60% resource upgrade).
• Lithium Americas - As of March 31, 2020, construction was 40% complete at the JV Caucharí-Olaroz Lithium Project. Thacker Pass has produced over 10,500 kg of high-quality lithium sulphate.