Active material ball electrode layer structure

Abstract

The invention discloses an active material ball electrode layer structure. The active material ball electrode layer structure mainly comprises a plurality of active material balls composed of active material particles, first mixed electrolytes located in the active material balls and second mixed electrolytes located outside the active material balls. The first mixed electrolyte is mainly composedof an electrolyte with a large deformation amount, and the second mixed electrolyte is mainly composed of an electrolyte with a small deformation amount. The positions of the active material particles in the active material ball are effectively controlled and the derived problems are reduced by utilizing the first mixed electrolyte, and the charge transfer resistance is reduced by matching different arrangements of the first mixed electrolyte and the second mixed electrolyte inside and outside the active material ball; meanwhile, the volume expansion resistance of the active material ball canbe provided.

Description

technical field [0001] The invention relates to a pole layer structure, in particular to an active material spherical pole layer structure. Background technique [0002] Existing lithium-ion secondary batteries mainly use liquid electrolytes as the lithium ion transmission medium. However, the volatile properties of liquid electrolytes will have adverse effects on the human body and the environment; , is also a great security risk. [0003] Furthermore, one of the reasons for the unstable performance of lithium batteries at present is mainly because the electrode surface activity is relatively large (negative electrode) and the voltage is relatively high (positive electrode). Stability, and then produce the so-called exothermic reaction to form a passive protective film on the contact interface between the two. These reactions will consume liquid electrolyte and lithium ions, and will also generate heat. Once a local short circuit occurs, the local temperature rises rapidl...

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Problems solved by technology

[0008] Another object of the present invention is to provide an active material ball pole layer structure. By configuring electrolytes with different concentrations and properties inside and outside the active material ball, the internal electrolyte can solve the problem of the depletion area caused by the drastic volume change of the active material, while the external electrolyte can provide resistance to volume expansion of the active material

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