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Preparation of battery active materials with micro-nano conductive network structure

A technology of active materials and conductive batteries, applied in structural parts, battery electrodes, secondary batteries, etc., can solve problems such as non-encapsulation and limited improvement in conductivity.

Active Publication Date: 2022-03-18
杭州长凯能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, people use various technical means to improve the conductivity of lithium iron phosphate materials, among which carbon coating has become one of the most effective methods to improve the conductivity of lithium iron phosphate, but the current carbon coating process is mainly coated on The secondary particles of the battery active material lithium iron phosphate cannot be coated on the primary particles, resulting in limited improvement in conductivity. The present invention aims to improve the conductivity of the battery active materials from the primary particles

Method used

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  • Preparation of battery active materials with micro-nano conductive network structure
  • Preparation of battery active materials with micro-nano conductive network structure
  • Preparation of battery active materials with micro-nano conductive network structure

Examples

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specific Embodiment 1

[0059] Uniformly disperse self-made cellulose nanofibers in deionized water to form a 0.3% by weight cellulose nanofiber dispersion 1, the diameter of the cellulose is between about 1-10 nm, and the length is between about 1-10 μm. The scanning of the cellulose Electron microscope such as Figure 7 shown.

specific Embodiment 2

[0061] Disperse polyvinyl alcohol uniformly in deionized water to form 0.25% by weight polyvinyl alcohol dispersion 2.

specific Embodiment 3

[0063] Dissolve 3.53kg of ferrous sulfate in 15kg of dispersion liquid 1 prepared according to the method of embodiment 1, stir to make it fully dissolve; dissolve 1.566 kg of ammonium dihydrogen phosphate in 16.5 kg of dispersion liquid 1 prepared according to the method of embodiment 1, stir Make it fully dissolved; add the ferrous sulfate solution into the reaction kettle, add hydrogen peroxide while stirring to fully oxidize the ferrous sulfate; add the ammonium dihydrogen phosphate solution into the reaction kettle and keep stirring until the ferric phosphate is completely precipitated; After the slurry is filtered, the filter cake is fully cleaned with deionized water; after the conductivity of the filtrate is controlled to be ≤350μs / cm, the filter cake is unloaded after pressing for 5-10 minutes; the filter cake is baked in an oven at 80-150°C for 5- In 24 hours, iron phosphate-carbon precursor 1 composite 1 was obtained, and the particle size distribution of the iron ph...

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Abstract

The present invention provides a method for preparing a conductive battery active material compound. Firstly, a battery active material precursor-carbon precursor complex is formed, and these carbon precursors will serve as crystal nuclei during the precipitation reaction to form the battery active material precursor, and the battery active material precursor will grow around these crystal nuclei. The existence of these crystal nuclei can improve the uniformity of the precursor nanoparticles of battery active materials. In the subsequent process of preparing battery active materials, they can also become carbon precursors existing inside the particles, and produce numerous micro-nano conductive carbon networks after sintering. The structure exists in the particles of the battery active material, forming a highly conductive battery active material composite containing a micro-nano conductive carbon network structure. These micro-nano conductive carbon network structures provide better and more efficient than traditional carbon coatings. The conductive channel can improve the conductivity of the battery active material, and can also increase the tap density and compaction density of the battery active material.

Description

technical field [0001] The present invention relates to a conductive battery active material composite, and a simple and cost-effective method for preparing a lithium-ion battery active material composite containing a micro-nano conductive carbon network structure with high conductivity. Active material composites for lithium-ion batteries containing micro-nano conductive carbon network structures, and their use in the production of active materials for lithium-ion batteries for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have broad market prospects and growth points in traditional 3C applications, pure electric and hybrid electric vehicles, distributed power generation and micro-grid energy storage, and all application scenarios of traditional lead-acid batteries. With the advancement of science and technology, people's demand for mobile energy is becoming stronger and stronger, especially the requirement for pure electric vehicles is continuo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/525H01M10/0525
CPCH01M4/362H01M4/583H01M4/625H01M4/525H01M10/0525Y02E60/10
Inventor 许之咏顾涛韩爽周慧金童
Owner 杭州长凯能源科技有限公司