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Microcapsule and positive electrode material for battery as well as preparation methods and application of microcapsule and positive electrode material

A positive electrode material and microcapsule technology, which is applied in the field of battery microcapsules and positive electrode materials and their preparation, can solve the problems of increasing the valence of transition elements, prone to decomposition reactions, and deteriorating battery safety performance.

Active Publication Date: 2015-03-25
GUIZHOU ZHENHUA E CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Studies have shown that the main mechanism of positive electrode materials leading to the safety risk of lithium-ion secondary batteries is: the migration of lithium ions from the positive electrode material, resulting in an increase in the price of transition elements, transition elements are prone to decomposition reactions in high oxidation states, and release activity at a certain temperature. Oxygen; on the other hand, transition elements with a high oxidation state can catalyze and decompose organic solvents (such as EC, DEC, PC, DMC, EMC, etc.) in the electrolyte at a certain temperature. Increased risk of further accidents such as fire / explosion

Method used

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  • Microcapsule and positive electrode material for battery as well as preparation methods and application of microcapsule and positive electrode material
  • Microcapsule and positive electrode material for battery as well as preparation methods and application of microcapsule and positive electrode material
  • Microcapsule and positive electrode material for battery as well as preparation methods and application of microcapsule and positive electrode material

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preparation example Construction

[0074] Generally speaking, the safe positive electrode material and its preparation method of the present invention include the following steps.

[0075] 1) Preparation of microcapsules for batteries;

[0076] 2) Preparation of cathode materials for lithium batteries;

[0077] 3) Characterization of microcapsules and preparations;

[0078] 4) The embodiment simulates battery and full battery assembly;

[0079] 5) The safety performance characterization of the full battery of the embodiment;

[0080] 6) Characterization of the electrochemical cycle performance of the full battery of the embodiment.

Embodiment 1

[0090] Microcapsule preparation

Embodiment 1-1

[0092] Weigh 50g of polytetrafluoroethylene emulsion and add a small amount of deionized water to dilute to a solid content of 20%, then start stirring, disperse the mixed liquid evenly, and slowly add 100g of decabromodiphenyl ether to it, at a temperature of 40°C, under the action of an emulsifier Emulsify and disperse for 60 minutes (rotational speed: 1500rpm), then pump the obtained emulsified slurry to the peristaltic airflow nozzle of the spray dryer, and use clean hot air (70°C) to carry out quality and heat treatment with the slurry droplets atomized by the nozzle. Exchange, complete instant evaporation and instant drying, and collect fluffy dry powder particles. The particle size (D 50 ) is about 0.1 μm, and the prepared powder is called Example 1-1. Among them, the particle size (D 50 ) refers to the corresponding particle size when the cumulative particle size distribution percentage reaches 50%.

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Abstract

The invention relates to the field of lithium ion secondary batteries, specifically relates to a microcapsule and a positive electrode material for a battery as well as preparation methods and application of the microcapsule and the positive electrode material. The microcapsule comprises 30-100 parts by weight of a core part and 10-110 parts by weight of a shell part, wherein the core part comprises a reducing substance and / or a flame retardant compound, the shell part is a macromolecule substance, the particle size of the microcapsule is 0.01-20 mum; the positive electrode material is prepared by blending and compounding the microcapsule and the basis positive electrode material. In a situation that internal temperature increase is out of control when the battery meets conditions such as acupuncture, over-charge, extrusion and fire, the microcapsule is molten and covers the surface of the positive electrode material, so that the volume resistivity of the material is enlarged; furthermore a reducing compound or a fire retardant compound is released, so that occurrence of the burning or explosion phenomenon caused by high temperature of the battery is reduced.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary batteries, in particular to a positive electrode material modified by reductive or flame-retardant microcapsules, that is, a battery microcapsule and positive electrode material, and a preparation method and application thereof. Background technique [0002] Due to the advantages of high energy density, high working voltage and long cycle life, lithium-ion secondary batteries are widely used as power sources and energy storage power stations for various mobile devices, and even in aviation, aerospace, navigation, automobiles, medical equipment, etc. Gradually replace other traditional batteries in the field. [0003] As lithium-ion secondary battery electric vehicles that have appeared in recent years (such as Prius produced by Toyota in Japan, Tesla electric vehicles produced by Tesla in the United States, etc., F6 iron battery electric vehicles produced by BYD Company, and electric vehicles ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/628H01M10/0525H01M10/4228H01M10/4235Y02E60/10
Inventor 赵孝连向黔新梅铭黄昕
Owner GUIZHOU ZHENHUA E CHEM INC
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