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Health and environmental effects of battery electric cars

From Wikipedia, the free encyclopedia

For a wider view, see Effects of cars and Environmental effects of transport.
The Tesla Model Y was the world's top selling electric car in 2022.[1]

Usage of electric cars damages people’s health and the environment less than similar sized internal combustion engine cars. While aspects of their production can induce similar, less or different environmental impacts, they produce little or no tailpipe emissions, and reduce dependence on petroleum, greenhouse gas emissions, and deaths from air pollution.[2] Electric motors are significantly more efficient than internal combustion engines and thus, even accounting for typical power plant efficiencies and distribution losses,[3] less energy is required to operate an electric vehicle. Manufacturing batteries for electric cars requires additional resources and energy, so they may have a larger environmental footprint in the production phase.[4][5] Electric vehicles also generate different impacts in their operation and maintenance. Electric vehicles are typically heavier and could produce more tire and road dust air pollution, but their regenerative braking could reduce such particulate pollution from brakes.[6] Electric vehicles are mechanically simpler, which reduces the use and disposal of engine oil.

Comparison with fossil-fueled cars

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Although all cars have effects on other people, battery electric cars have major environmental benefits over conventional internal combustion engine vehicles, such as:

  • Elimination of harmful tailpipe pollutants such as various oxides of nitrogen, which kill thousands of people every year[7]
  • Less CO2 emissions than fossil-fuelled cars, thus limiting climate change[8]
  • As almost all electric cars have regenerative braking brake pads can be used less frequently than in non-electric cars, and may thus sometimes produce less particulate pollution than brakes in non-electric cars.[9][10] Also, some electric cars may have a combination of drum brakes and disc brakes, and drum brakes are known to cause less particulate emissions than disc brakes.[11] Under the provisionally agreed Euro 7 standard electric cars have a lower limit of brake particulates.[12][13]

Electric cars may have some disadvantages, such as:

  • Possible increased tire pollution compared to fossil-fueled cars. This is sometimes caused by the fact that most electric cars have a heavy battery, which means the car's tires are subjected to more wear.[14][15] Devices to capture tyre particulates are being developed,[16][17] and under Euro 7 all new cars will have to meet the same tyre particulate limit.[18]
  • If electric cars are bigger than fossil fuel cars there may be more road dust pollution. However as of 2024 more research on road dust air pollution is needed.[2]

Materials extraction impact

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Raw materials

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Plug-in hybrids and electric cars run off lithium-ion batteries and rare-earth element electric motors. Electric vehicles use much more lithium carbonate equivalent in their batteries compared to the 7g (0.25 oz) for a smartphone or the 30 g (1.1 oz) used by tablets or computers. As of 2016, a hybrid electric passenger car might use 5 kg (11 lb) of lithium carbonate equivalent, while one of Tesla's high performance electric cars could use as much as 80 kg (180 lb) of lithium carbonate equivalent. [19]

Most electric vehicles use permanent magnet motors as they are more efficient than induction motors. These permanent magnets use neodymium and praseodymium which can be dirty and difficult to produce.

Geographical distribution of the global battery supply chain[20]: 58 

The demand for lithium used by the batteries and rare-earth elements (such as neodymium, boron, and cobalt[21]) used by the electric motors, is expected to grow significantly due to the future sales increase of plug-in electric vehicles. However in 2024 The Economist wrote that “… within a decade or so most of the global demand for raw materials to build new batteries could be met by recycling old ones.”.[22]

In 2022 the Intergovernmental Panel on Climate Change said (with medium confidence) "Emerging national strategies on critical minerals and the requirements from major vehicle manufacturers are leading to new, more geographically diverse mines. The standardisation of battery modules and packaging within and across vehicle platforms, as well as increased focus on design for recyclability are important. Given the high degree of potential recyclability of lithium-ion batteries, a nearly closed-loop system in the future could mitigate concerns about critical mineral issues."[23]: 142 

Open-pit nickel mining has led to environmental degradation and pollution in developing countries such as the Philippines and Indonesia.[24][25] In 2024, nickel mining and processing was one of the main causes of deforestation in Indonesia.[26][27] Open-pit cobalt mining has led to deforestation and habitat destruction in the Democratic Republic of Congo.[28]

Lithium

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The Salar de Uyuni in Bolivia is one of the largest known lithium reserves in the world.[29][30]
See also: Lithium § Environmental_issues, and Lithium-ion battery § Environmental impact

The main deposits of lithium are found in China and throughout the Andes mountain chain in South America. In 2008 Chile was the leading lithium metal producer with almost 30%, followed by China, Argentina, and Australia.[31][32] Lithium recovered from brine, such as in Nevada[33][34] and Cornwall, is much more environmentally friendly.[35]

Nearly half the world's known reserves are located in Bolivia,[31][29] and according to the US Geological Survey, Bolivia's Salar de Uyuni desert has 5.4 million tons of lithium.[29][33] Other important reserves are located in Chile,[36] China, and Brazil.[31][33]

According to a 2020 study balancing lithium supply and demand for the rest of the century needs good recycling systems, vehicle-to-grid integration, and lower lithium intensity of transportation.[37]

Rare-earth elements

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Evolution of global rare-earth oxides production by country (1950–2000)
See also: Rare-earth element

Electric motor manufactured for plug-in electric cars and hybrid electric vehicles use rare-earth elements. The demand for heavy metals, and other specific elements (such as neodymium, boron and cobalt) required for the batteries and powertrain is expected to grow significantly due to the future sales increase of plug-in electric vehicles in the mid and long term.[38][31] It is estimated that there are sufficient lithium reserves to power 4 billion electric cars.[39][40]

China has 48% of the world's reserves of rare-earth elements,[41] the United States has 13%, and Russia, Australia, and Canada have significant deposits. Until the 1980s, the U.S. led the world in rare-earth production, but since the mid-1990s China has controlled the world market for these elements. The mines in Bayan Obo near Baotou, Inner Mongolia, are currently the largest source of rare-earth metals and are 80% of China's production.[42][relevant?]

Manufacturing impact

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Electric cars also have impacts arising from the manufacturing of the vehicle.[43][44] Electric cars can utilize two types of motors: permanent magnet motors (like the one found in the Mercedes EQA), and induction motors (like the one found on the Tesla Model 3). Induction motors do not use magnets, but permanent magnet motors do. The magnets found in permanent magnet motors used in electric vehicles contain rare-earth metals to increase the power output of these motors.[45] The mining and processing of metals such as lithium, copper, and nickel can release toxic compounds into the surrounding area. Local populations may be exposed to toxic substances through air and groundwater contamination.[46]

Several reports have found that hybrid electric vehicles, plug-in hybrids and all-electric cars generate more carbon emissions during their production than current internal combustion engine vehicles but still have a lower overall carbon footprint over the full life cycle.[47] The initial higher carbon footprint is due mainly to battery production,[48] which may double the production carbon footprint as of 2023 but this varies a lot by country and is forecast to decrease rapidly during the decade.[49]

Consumer use impacts

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Air pollution and carbon emissions

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See also: Plug-in hybrid § Greenhouse gas emissions

Compared to conventional internal combustion engine automobiles, electric cars reduce local air pollution, especially in cities,[50] as they do not emit harmful tailpipe pollutants such as particulates (soot), volatile organic compounds, hydrocarbons, carbon monoxide, ozone, lead, and various oxides of nitrogen. Some of the environmental impact may instead be shifted to the site of the generation plants, depending on the method by which the electricity used to recharge the batteries is generated. This shift of environmental impact from the vehicle itself (in the case of internal combustion engine vehicles) to the source of electricity (in the case of electric vehicles) is referred to as the long tailpipe of electric vehicles. This impact, however, is still less than that of traditional vehicles, as the large size of power plants allow them to generate less emissions per unit power than internal combustion engines, and electricity generation continues to become greener as renewables such as wind, solar and nuclear power become more widespread. By 2050, carbon emissions reduced by the use of electric cars can save over 1163 lives annually and over $12.61 billion in health benefits in many major U.S. metropolitan cities such as Los Angeles and New York City.[51]

The specific emission intensity of generating electric power varies significantly with respect to location and time, depending on current demand and availability of renewable sources (See List of renewable energy topics by country and territory). The phase-out of fossil fuels and coal and transition to renewable and low-carbon power sources will make electricity generation greener, which will reduce the impact of electric vehicles that use that electricity.

Most of the lithium-ion battery production occurs in China, where the bulk of energy used is supplied by coal burning power plants. A study of hundreds of cars on sale in 2021 concluded that the life cycle GHG emissions of full electric cars are slightly less than hybrids and that both are less than gasoline and diesel fuelled cars.[52]

Particulates

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See also: Mobile source air pollution

The operation of any car results in non-exhaust emissions such as brake dust, airborne road dust, and tire erosion, which contribute to particulate matter in the air.[53] Particulate matter is dangerous for respiratory health.[54][55] In the UK non-tailpipe particulate emissions from all types of vehicles (including electric vehicles) may be responsible for between 7,000 and 8,000 premature deaths a year.[53]

Lower operational impacts and maintenance needs

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Battery electric vehicles have lower maintenance costs compared to internal combustion vehicles since electronic systems break down much less often than the mechanical systems in conventional vehicles, and the fewer mechanical systems onboard last longer due to the better use of the electric engine. Electric cars do not require oil changes and other routine maintenance checks.[56][57]

Internal combustion engines are relatively inefficient at converting on-board fuel energy to propulsion as most of the energy is wasted as heat, and the rest while the engine is idling. Electric motors, on the other hand, are more efficient at converting stored energy into driving a vehicle. Electric drive vehicles do not consume energy while at rest or coasting, and modern plug-in cars can capture and reuse as much as one fifth of the energy normally lost during braking through regenerative braking.[56][57]

Low repairability

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BEVs are easily totaled because of battery damage,[58][59] and some have called for the right to repair.[60]

Some EVs are made using gigacasting to lower their cost which complicates repairs.[61]

Fires

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Water usage

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Up to 150,000 liters of water are required to put out a single BEV fire. ICE fires are typically extinguished using less than 4,000 liters.[62]

End-of-life

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Main article: Battery recycling

Batteries

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Lead–acid

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Like internal combustion engine cars, most electric cars, as of 2023, contain lead–acid batteries which are used to power the vehicle's auxiliary electrical systems.[63] In some countries lead acid batteries are not recycled safely.[64][65]

Lithium-ion

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Current retirement criteria for lithium-ion batteries in electric vehicles cite 80% capacity for end-of-first-life, and 65% capacity for end-of-second-life.[66] The first-life defines the lifespan of the battery's intended use, while the second-life defines the lifespan of the battery's subsequent use-case. Lithium-ion batteries from cars can sometimes be re-used for a second-life in factories[67] or as stationary batteries.[68] Some electric vehicle manufacturers, such as Tesla, claim that a lithium-ion battery that no longer fulfills the requirements of its intended use can be serviced by them directly, thereby lengthening its first-life.[69] Reused electric vehicle batteries can potentially supply 60-100% of the grid-scale lithium-ion energy storage by 2030.[70] The carbon footprint of an electric vehicle lithium-ion battery can be reduced by up to 17% if reused rather than immediately retired.[66] After retirement, direct recycling processes allow reuse of cathode mixtures, which removes processing steps required for manufacturing them. When this is infeasible, individual materials can be obtained through pyrometallurgy and hydrometallurgy. When lithium-ion batteries are recycled, if they are not handled properly, the harmful substances inside will cause secondary[clarification needed] pollution to the environment.[71] These same processes can also endanger workers and damage their health.[72] Lithium-ion batteries, when disposed of in household trash, can present fire hazards in transport and in landfills, resulting in trash fires that can destroy other recyclable materials and create increased carbon dioxide and particulate matter emissions.[73] Vehicle fires cause local pollution.[74]

Motors

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Electric motors are an essential component of electric cars that convert electrical energy into mechanical energy to move the wheels, where neodymium magnets are commonly used in the manufacturing process.[75] There is currently no cost-effective way for the industry to recycle electric motors due to the complicated extraction process of these magnets.[76] Many electric motors end up in the landfill or are shredded because there is no viable recycle or disposal alternative.[76][relevant?]

Two primary efforts to remedy this dilemma include the DEMETER project and a joint venture between Nissan Motors and Waseda University to lessen the environment impact of electric motors.[76][77] The DEMETER project was a research initiative between the European Union and private entities, which culminated in the development of a recyclable electric motor designed by French company Valeo.[77] Nissan and Waseda identified and refined a new process for extracting rare-earth magnets for re-use in the manufacturing of new electric vehicle motors.[77][relevant?]

See also

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Further reading

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Wheeler, Max (July 30, 2024) "Are Electric Vehicles Really Green?", SmartMotoring.com

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