51.2v solar energy storage battery pack.What new breakthroughs will power batteries have in the future?

　　Under the current system, the theoretical limit of battery energy density is 300Wh/kg. If it is to reach 2025, the new system power battery technology will make breakthrough progress, with a single specific energy of 500Wh/kg. Promising solutions include solid-state lithium batteries, New electrochemical system batteries such as lithium-sulfur batteries and lithium-air batteries. Solid-state batteries have the highest possibility of large-scale commercialization, because there is no difference in the working principles of solid-state lithium batteries and liquid lithium batteries, except that the electrolyte is solid and liquid. Since solid-state batteries no longer use graphite negative electrodes, but directly use metallic lithium negative electrodes, the amount of negative electrode materials is greatly reduced, significantly improving the energy density of the entire battery. At present, the laboratory has trial-produced an all-solid-state battery with an energy density of 300-400Wh/kg and a relatively high safety performance. However, this type of battery is small in size and high in cost. It is currently only used in high-end compact devices such as Apple mobile phones. Lithium-sulfur batteries have the highest energy density. The specific energy density of lithium-sulfur batteries currently trialled in the laboratory can reach 500Wh/kg. The theoretical specific energy of sulfur as a cathode material is as high as 2600Wh/kg. Elemental sulfur is low-cost and environmentally friendly. However, lithium There are many technical problems that cannot be overcome during the trial production of sulfur batteries, including safety, rate performance and cycle stability. Lithium-sulfur batteries have broad application prospects and are environmentally friendly. If the trial production is successful, it will be tantamount to a revolution. New energy vehicles will quickly replace traditional fuel vehicles. Lithium-air batteries have the longest cruising range, with a single cruising range of up to 2,000 kilometers. Not only that, the specific energy of lithium-air batteries is expected to exceed 700Wh/kg. Metal-air battery is a special fuel cell that uses metal as fuel and reacts with oxygen in the air to generate electricity. The specific energy of lithium-air batteries is 10 times that of lithium-ion batteries, and they are smaller and lighter. However, lithium metal is too reactive and will undergo a violent oxidation-reduction reaction immediately when it encounters water vapor. Its safety and stability are poor. There are still many technical difficulties to be overcome in the application of lithium-air batteries.

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