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A kind of composition and preparation method thereof

A composition and sediment technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve problems such as battery capacity decline

Active Publication Date: 2020-09-01
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the current battery discharge current density is increased, the battery capacity will drop significantly, which is unfavorable for the application of lithium batteries in electric vehicles.

Method used

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  • A kind of composition and preparation method thereof
  • A kind of composition and preparation method thereof
  • A kind of composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 1. BiFeO 3 Preparation of nanoparticles:

[0089] First, with 0.5mmol Bi(NO 3 ) 3 ·5H 2 O, 0.5mmol of Fe(NO 3 ) 3 9H 2 O, 0.5 mmol of sodium dodecyl sulfate (SDS) and 1 mL of concentrated nitric acid were dissolved in deionized water to form a solution with a total volume of 10 mL. Accompanied by the vigorous stirring of the magneton, add concentrated ammonia water dropwise as slowly as possible to the above solution until the pH value reaches between 9-10, so that the Bi in the solution 3+ ions and Fe 3+ The ions are all precipitated.

[0090] Then, the upper layer solution was discarded by centrifugation to obtain a precipitate, and the precipitate was continued to be washed with deionized water-after centrifugation several times, the pH value of the solution after washing the precipitate was neutral.

[0091] At this time, the centrifuged precipitate was mixed with 18 mL of 12 M KOH solution, stirred for a period of time, and then transferred to a 25 mL high...

Embodiment 2

[0100] The difference between embodiment 2 and embodiment 1 is:

[0101] The positive electrode material composition is: lithium cobalt oxide powder, BiFeO 3 Nanoparticles, conductive carbon black and binder (PVDF) are mixed in a mass ratio of 96:1:1:2

[0102] The negative electrode material composition is: graphite powder, BiFeO 3 Nanoparticles, conductive carbon black, thickener (carboxymethyl cellulose CMC) and binder (styrene-butadiene latex water-based resin SBR) were mixed in a mass ratio of 95:1:1:0.9:2.1.

[0103] Other steps are the same as in Example 1. The weight of the obtained battery was the same as in Example 1.

Embodiment 3

[0104] Embodiment 3 (positive electrode material contains ferroelectric material 0.5%, negative electrode material does not contain)

[0105] The difference between embodiment 3 and embodiment 1 is:

[0106] In the positive electrode material composition, positive electrode lithium cobaltate powder, BiFeO 3 The weight ratio of nanoparticles, binder and conductive agent is 96:0.5:1.5:2.

[0107] In the negative electrode material composition, the weight ratio of graphite powder, conductive carbon black, thickener (carboxymethyl cellulose CMC) and binder (styrene-butadiene latex water-based resin SBR) is 95:2:0.9:2.1.

[0108] Other steps are the same as in Example 1. The weight of the obtained battery was the same as in Example 1.

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Abstract

The invention relates to a composition and a preparation method thereof. The composition comprises an electrode active material and ferroelectric material nanoparticles; and the weight ratio of the electrode active material to the ferroelectric material nanoparticles is (90-100) to (0.1-5). When the composition is used as an electrode material of a battery, the capacity of the battery can be obviously improved, particularly at high rate.

Description

technical field [0001] The disclosure belongs to the field of batteries, and in particular relates to a composition and a preparation method thereof. Background technique [0002] With the rise of new energy vehicles, lithium secondary batteries with high capacity and high rate have great advantages in providing energy for vehicles, and can realize rapid charging and discharging of batteries. However, when the discharge current density of current batteries is increased, the battery capacity will drop significantly, which is unfavorable for the application of lithium batteries in electric vehicles. [0003] In order to improve the rate performance of lithium batteries, the inventors have known related technologies to heat-treat the binder (PVDF) to transform its crystal structure (transition from α phase to β phase), thereby improving battery performance. Contents of the invention [0004] The inventors found that after the electrode active material is mixed with ferroelec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/525H01M10/0525
CPCH01M4/36H01M4/362H01M4/525H01M4/621H01M10/0525Y02E60/10
Inventor 赵志刚魏文飞钟宽李乾乾邹十美段科吉纯
Owner GREE ELECTRIC APPLIANCES INC