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Tesla delivers bad news for cobalt price, boost for rare earths

Wall Street is aghast at Elon Musk’s dismissive attitude toward analysts’ probing following a quarter of record (but less than expected) losses for Tesla, but the electric vehicle maker did provide some answers to questions that’s been vexing the mining industry.

Benchmark Mineral Intelligence, a provider of price information and research on battery supply chains, parsed the numbers after Tesla gave a rare indication of the relative proportions of raw materials used in its latest lithium-ion battery for its Model 3.

At first blush it’s not good news for miners of cobalt, a crucial ingredient in batteries used in electric vehicles and cellphones that's been trading near decade highs above $90,000 a tonne.

Nickel-Manganese-Cobalt (NMC) batteries favoured by most vehicle makers contain around 20% cobalt. Tesla is a proponent of nickel-cobalt-aluminium (NCA) technology which requires less than a third the amount of cobalt.

Musk said on Wednesday the cobalt content of its NCA cathode chemistry “is already lower than next-generation cathodes that will be made by other cell producers with a nickel-manganese-cobalt ratio of 8:1:1″.

Benchmark said over six years – from the Roadster to the Model 3 – the EV producer has reduced its cobalt needs by 59% on average per vehicle.

Tesla’s US rivals and Japanese, Korean and German automakers have a lot of catching up to do when it comes to thrifting which suggests cobalt producers should not lose too much sleep:

Since their inception, cathode and battery manufacturers have been working on reducing their cobalt dependency as this is the most expensive raw material input.

With NCM, a number of formulations have been developed over the last 25 years, each with a lower cobalt intensity usage than the next.

The original NCM111 material has evolved into NCM523 (5 parts nickel, 2 cobalt and 3 manganese) and more recently, NCM622 (6 parts nickel, 2 cobalt and 3 manganese).

The end game with this chemistry is to develop NCM811, to which Elon Musk’s refers to. However, this is still a number of years away from widespread commercial adoption due to lifecycle and safety concerns but will offer a lower raw material costs and improved energy density.

In fact, Benchmark only expects NCM811 to have a material impact on the lithium ion battery industry from 2022 onwards when we forecast it to account for 10% of the cathode market.

Annual production cobalt is only around 100,000 tonnes primarily as a byproduct of nickel and copper mining with more than 60% coming from the Democratic Republic of the Congo, where fears about political instability and the challenges of ethical sourcing combine to supercharge supply concerns.

Tesla delivers bad news for cobalt price

Source: Benchmark Mineral Intelligence

Return to rare earths

Another significant difference between Tesla and other automakers has been its use of induction motors in its Roadster and S models, which unlike permanent magnet traction motors features no rare earths elements.

Car manufacturers are keen to reduce reliance on rare earths, which like cobalt, suffers from highly concentrated supply and unpredictable pricing, with China holding a virtual global monopoly in primary supply and processing.

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