https://hotcopper.com.au/threads/banter-and-general-comments.4474...

https://hotcopper.com.au/threads/banter-and-general-comments.4474625/?post_id=42360435&embed=1I think you will find this post from @GCar in response to my suggestion that if in doubt comparing the charts between the two should clarify things a little more succinctly
The tradingeconomics page makes reference to an ETF.
Sorry I don't have time to go digging to find the conclusive link you may be looking for.
Perhaps you could email trading economics for more information regarding the ETF they use as their benchmark.
Here is an article discussing the LME teaming up to attempt to provide a benchmark given the absence of benchmark pricing for the lithium industry is a hindrance to the investment community.
https://*********.com.au/pricing-concerns-divide-lithium-cobalt-markets/
Personally I tend to take the view that the global lithium market is a speciality chemicals industry and not a commodity.