Recently, the lithium slurry battery project undertaken by the Institute of Electrical Engineering, Chinese Academy of Sciences passed the acceptance of the Beijing Municipal Science and Technology Commission.

"Low cost, long life, high safety, and easy recycling are the comprehensive goals for the development of energy storage batteries. The existing lithium-ion batteries are generally 'petite and rich,' and are not suitable for large-scale energy storage scenarios. Can energy storage applications be used? Oriented to develop 'silly, big, stupid,' large-capacity power storage batteries? At the end of 2010, we began to explore the combination of lithium batteries and other types of storage batteries, and researched lithium slurry batteries suitable for large-capacity energy storage. "Yongchuang Chen, the leader of the energy storage technology research group of the Electrician Institute and the leader of the technical team of the lithium slurry battery project, said.

It is reported that the technical name "Lithium Slurry Battery" was first formally proposed by the Chen Yongchuang technical team in the 2015 invention patent CN 201510164222.1. Up to now, the project has applied for 92 patents and been authorized 35 items. It was authorized by the United States in March of this year and has formed a technical route with independent intellectual property rights internationally.

Chen Yongchuang said that compared with traditional lithium batteries, lithium paste batteries have four major characteristics: First, the battery manufacturing cost is lower, and the ultra-thick paste electrode is 10-50 times the thickness of the common lithium ion battery coated bonding electrode. It is suitable for providing large-capacity power storage output; second, it can be regenerated and repaired. When the performance of the battery drops for a period of time, the internal interface of the battery is repaired by regeneration technology, and the vitality of the battery is renewed to reach a calendar life of more than 10 years; Safe and controllable, when a short-circuit failure occurs in the battery, the battery can be controlled and maintained through the safety system to ensure that the battery does not burn or explode; the fourth is to solve the problem of battery recycling. When the battery is scrapped, the slurry is easy to recycle The treatment can be supplemented by missing trace elements and used for new battery production after regeneration. It is estimated that the manufacturing cost of lithium paste batteries is about 1/3 lower than that of ordinary lithium-ion batteries, and it is expected to break through the electricity cost of 0.4 yuan / kWh after future large-scale production.

This research innovatively proposes a "collector internal resistance decoupling structure" that is completely different from the existing battery structure. Through the relevant experiments, the polarization problem of the ultra-thick electrode is solved.

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