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Active Material Ball Composite Layer

A technology of active material and composite layer, applied in the field of composite layer, can solve problems such as depletion

Active Publication Date: 2022-03-04
PROLOGIUM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a composite layer of active material balls, which uses a relatively high proportion of hard adhesive to form active material balls, so as to effectively control the huge volume change of active material particles due to the charging and discharging process, and then solve the problem of The depletion zone and its derived problems

Method used

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  • Active Material Ball Composite Layer
  • Active Material Ball Composite Layer
  • Active Material Ball Composite Layer

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Embodiment Construction

[0029] Please also refer to figure 1 and figure 2 , each of which is a schematic diagram of the composite layer of active material spheres and a schematic structural diagram of the active material spheres provided by the embodiments of the present invention. The active material sphere composite layer 20 disclosed in the present invention is mainly composed of several preformed active material spheres 10 , an external adhesive 23 and a second conductive material 22 . The preformed active material ball 10 mainly includes a plurality of first active material particles 11 , a first conductive material 12 and an internal adhesive 13 . The range of median diameter D50 of this first active material particle 11 is no more than 60% of the diameter of active material ball 10, for example, when the diameter of active material ball 10 is 50-60 microns, the first active material particle 11 The median particle size D50 range will be within 30 to 36 microns. The first active material pa...

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Abstract

The present invention teaches a composite layer of active material spheres. The composite layer of active material balls is composed of several active material balls and an external adhesive, and the active material balls include several active material particles and a first conductive material, which are adhered and formed by an internal adhesive, and then The external adhesive is used to adhere the active material balls to form a composite layer, and the elastic elasticity of the internal adhesive is smaller than that of the external adhesive, which can control the expansion scale of the active material particles after charging and discharging, and avoid or reduce the void area that cannot be recovered. generation.

Description

technical field [0001] The invention relates to a composite layer applied to an electrochemical device, especially a composite layer with active material balls, wherein the active material balls are composed of active materials with high electrochemical reaction volume variability. Background technique [0002] In lithium-ion battery anode materials, because the theoretical specific capacity of traditional graphite carbon anode materials is only 372mAh / g, this limits the improvement of the energy density of lithium-ion batteries, while silicon has a theoretical specific capacity of up to 4200mAh / g, which has become the current research focus. However, when elemental silicon is used as a negative electrode, a huge volume change (up to 300%) will occur due to the charging and discharging process, which will easily lead to the formation of a void interface between the electrolyte and elemental silicon, resulting in continued degradation of electrode performance. Among them, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525Y02E60/10
Inventor 杨思枬
Owner PROLOGIUM TECH