Why Tesla LFP Batteries Are More Environmentally Friendly
Back in August of 2021, we compared NCA (lithium nickel cobalt aluminum oxide) batteries with LFP (lithium iron phosphate) batteries - "Tesla's LFP (iron) batteries compared. Which one should you buy?". NCA batteries had been the standard for all Tesla models in the USA, but Tesla’s plans to switch to LFP in Model 3s and Model Ys prompted that article. Tesla even offered more rapid delivery to customers waiting for the cars they had on order if they decided to get their car with LFP batteries.
There are trade-offs between these two battery types in terms of weight, range, consequences of carrying a full charge, regenerative braking, and cold weather behavior which are all discussed in the column mentioned above. These are all valid considerations, but working from the assumption that a prime motivation of most people buying an electric car is to promote a healthy environment and a healthier planet (by cutting CO2 emissions), it should also be mentioned that these two battery chemistries have vastly different implications for the environment. Crucially, NCA batteries are built with a lot of nickel (about 18 kg in a Tesla) whereas LFP batteries have none. But high demand for nickel for Teslas (and many other electric vehicle models) is accelerating strip-mining in Indonesia and the Philippines. Mining is one thing, but strip mining is more problematic.
Strip mining on tropical islands in Southeast Asia is especially harmful because these are centers of biodiversity with large numbers of unique species of plants and animals, many of which are endangered - some critically so. Unlike forest clearing, where the land retains some value for agricultural production, strip mining obliterates what is there and it will likely be decades, if not centuries, before such areas are productive again. When not rainforests, this strip mining is destroying agricultural land. Plus, Southeast Asia has high rainfall, so once the land is laid bare, erosion carries large amounts of sediment onto nearby coral reefs.
Details matter, however, and in this case it should be pointed out that nickel is mined from two sources - laterite and sulfide. Laterite deposits (as in Indonesia and the Philippines) are formed by the weathering of ultramafic bedrock in areas of high seasonal rainfall, along ridges and mountain shoulders. Through leaching, nickel accumulates 10-25 m below the surface and the only way to get at it is to clear off the top 10 m and everything living there.
In contrast, sulfide deposits are in the bedrock and nickel is extracted by hard-rock mining, sometimes near the surface, but often far underground. This distinction is important for electric vehicles because sulfide deposits are smelted into the highly pure nickel which is required for batteries. When laterite nickel is smelted, the lower purity nickel primarily goes to other uses, such as stainless steel. However, if laterite nickel is processed by High Pressure Acid Leaching (HPAL), nickel of sufficient purity for batteries is produced, but at present not very much is produced this way. Of the other uses of nickel besides for batteries, some processes also need high purity nickel, but some can use either high or lower purity nickel. Another important point is that there are not likely prospects for increased production of sulfide nickel, whereas there are extensive areas available for mining laterite nickel.
This may all seem convoluted, but what this all means is 1) as consumption of sulfide nickel for batteries grows with the expansion of the electric vehicle market, this will take up more and more of available sulfide supplies; 2) processes which can use either will hence shift to laterite nickel. Thus, while some may point out that electric vehicle batteries, for the most part, do not use laterite nickel and hence are not the cause of the expanding strip-mining occurring in Indonesia and the Philippines (and in a few other places such as Venezuela and Brazil), it is nevertheless true that additional demand for laterite nickel is a consequence of vehicle batteries taking an increasingly large portion of the available sulfide nickel.
Despite much press coverage last year, Tesla's transition to LFP batteries has only made it to the Model 3 Rear Wheel Drive model (in the USA). Other models may get LFP batteries in the future, as they have in Europe. So, buying a Tesla is a great way to contribute to the decarbonization of your personal transportation, but to avoid the harmful impacts of high-nickel battery chemistries, lithium iron phosphate (LFP) is the best, even if you have to be selective as to which model you get.
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