Active material body for a battery

Abstract

The invention relates to an active material body for a rechargeable battery, whereby the active material body comprises at least one active material that has a Young's modulus EA and at least one layered first coating applied on the surface of the active material, whereby the coating consists of a first material that has a first Young's modulus E1 whereby the following applies: first Young's modulus<=Young's modulus of the active material.

Description

technical field [0001] The invention relates to an active material body for accumulators. Background technique [0002] The bodies of active material generally form electrodes in accumulators. Batteries are electrochemically based rechargeable stores for electrical energy. Lithium-ion accumulators are known, for example, in which the reactive material (active material) and the electrolyte in the negative and positive electrodes contain lithium ions. [0003] Lithium-ion batteries experience capacity and performance loss throughout their service life, which can be attributed to degradation of the electrodes. An important role here is the (electro)chemical reaction between the active material and the electrolyte at the surface of the active material. This leads to the decomposition of the electrolyte and the formation of a thin layer on the surface of the active material, the so-called SEI (Solid Electrolyte Interphase, solid electrolyte interphase or solid electrolyte inte...

AI Technical Summary

Problems solved by technology

In this case, avoid fast charging processes or reduce their speed as much as possible, because otherwise these fast charging processes can lead to a significant shortening of the battery life

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