Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery

A lithium-ion battery and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult storage, air sensitivity, and complicated preparation process
CN112635720AActive Publication Date: 2021-04-09CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-04-09

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Abstract

The invention relates to the field of lithium ion batteries, and discloses an electrode material lithium supplement additive, a preparation method and application thereof, and a lithium ion battery, the electrode material lithium supplement additive comprises polymer lithium salt and a carbon film coating the surface of the polymer lithium salt. The preparation method of the electrode material lithium supplementing additive comprises the following steps: (1), mixing polymer lithium salt, a carbon source and a solvent; (2), carrying out solid-liquid separation on the material obtained by mixing in the step (1); and (3), carrying out heat treatment on the solid substance obtained by solid-liquid separation. The electrode material lithium supplement additive provided by the invention is convenient to store, has no special requirements on use conditions, and can improve the specific capacity of the material when being used in the electrode material.
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Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode material lithium supplement additive, a preparation method and application thereof, and a lithium ion battery. Background technique

[0002] The theoretical specific capacity of silicon base material is 4200mA·h·g -1 , is currently the anode material with the highest gram capacity. Once successfully applied, it can significantly increase the energy density of lithium batteries, making it possible for a battery life of 1,000 kilometers on a single charge. However, the charging and discharging mechanism of silicon is different from that of graphite. During the charging and discharging process, Si and Li in the electrolyte + A solid electrolyte (SEI) film will be continuously formed at the interface. The formation of this irreversible SEI consumes a large amount of Li released from the electrolyte and the positive electrode material, resulting in the firs...

Claims

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