Lithium-ion batteries are one of the most widely used batteries at present. It has advantages such as high energy density, long lifespan and low self-discharge rate, and is widely applied in fields like electric vehicles, mobile phones and laptops. However, lithium-ion batteries also have some limitations, for example, the relatively high cost and the performance may be affected in high or low temperature environments.
In recent years, some new battery technologies are gradually emerging.
Solid-state lithium-ion batteries are an innovative technology. It abandons the liquid or gel electrolyte in traditional lithium-ion batteries and adopts solid electrolytes, such as oxide crystalline solid electrolytes, sulfide glassy electrolytes, solid polymers, etc. This enables its energy density to be three times that of liquid lithium-ion batteries, and the non-flammable feature greatly reduces the risk of thermal runaway. Nevertheless, the technical threshold of solid-state batteries is extremely high, involving multiple aspects, and currently still faces challenges in engineering manufacturing and mass production.
Sodium-ion batteries utilize reversible electrochemical reactions of sodium ions between the positive and negative electrodes to complete charging and discharging. Its safety performance is excellent, and sodium resources are also relatively abundant and cheap, with greater sustainability. But sodium-ion batteries have problems such as low energy density and relatively short cycle life, and the technology still needs further research and improvement.
Graphene batteries use a mixture of solid materials and graphene as the negative electrode. Compared with lithium-ion batteries, it has lower resistivity and higher charge and discharge rate, enabling faster charging speed, larger battery capacity and longer service life. However, lithium-ion batteries also have some limitations, such as relatively high cost and possible performance impact in high or low temperature environments.