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Positive electrode for battery, method for producing same, and battery with same

A cathode and battery technology, applied in the field of batteries based on internal ion exchange, can solve the problems of deterioration of battery electrochemical performance and limit the practical application of batteries, and achieve the effects of prolonging float life, reducing swelling, and reducing float current.

Active Publication Date: 2021-01-05
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, when this type of battery is being charged, the battery self-discharge problem is relatively serious, which rapidly deteriorates the electrochemical performance of the battery and limits the practical application of this type of battery.

Method used

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  • Positive electrode for battery, method for producing same, and battery with same
  • Positive electrode for battery, method for producing same, and battery with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Synthesis of Modified Lignin

[0082] Commercially available lignin (GPSI, YY(BR)-01196, Abcam) was loaded into a porcelain boat, put into a temperature-controlled tube furnace, and heated from room temperature to 500°C for 1 hour under an argon atmosphere. After cooling down to room temperature with the furnace, a white powder of modified lignin was obtained.

[0083] Among them, the specific surface area of ​​modified lignin is 76.43m 2 / g, with a three-dimensional network structure and a molecular weight of 13,000.

[0084] battery assembly

[0085] Lithium manganese oxide LMO (LiMn 2 o 4 , MTI), conductive agent graphite (KS-6, AL-125, TIMCAL), binder styrene-butadiene rubber (SBR, SBR-Latex, Wykamol), the above-mentioned modified lignin and carboxymethyl cellulose (CMC, Sigma-Alrich, C4888), mixed in water according to the mass ratio 89:5:3.5:1:1.5, mixed to form a uniform positive electrode slurry, the positive electrode slurry was coated on graphite foil t...

Embodiment 2

[0090] The difference from Example 1 is that commercially available lignin is used instead of the modified lignin in Example 1, and other battery components and materials are the same as in Example 1. A battery was assembled (recorded as GPSI-SBR-LMO-1, the number 1 represents the mass percentage of the modified lignin in the slurry), and the battery was tested.

Embodiment 3

[0094] The difference from Example 1 is that the mass ratio of the modified lignin in the positive electrode slurry is 2wt%, and other battery components and materials are the same as in Example 1. Assemble a battery (denoted as modified GPSI-SBR-LMO-2, the number 2 represents the mass percentage of lignin in the slurry), and test the battery.

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Abstract

The invention relates to a positive electrode for a battery, a preparation method thereof, and a battery with the positive electrode, wherein the positive electrode includes a positive electrode additive, and the positive electrode additive includes lignin, lignin salt, modified lignin, modified lignin at least one of plain salts. The positive electrode additive is added to the battery positive electrode of the present invention, which can effectively reduce the expansion of the positive electrode during charging and discharging, reduce the floating charge current of the battery during floating charging, prolong the floating charge life of the positive electrode, and improve the performance of the positive electrode conductive agent of the ion exchange battery. Corrosion problems, thereby further improving the self-discharge problem of the battery.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a battery based on internal ion exchange. Background technique [0002] Lead-acid batteries, which have been around for more than a hundred years, have mature battery technology and occupy an absolute market share in energy storage fields such as car starter batteries, electric bicycles, and UPS. Although the lead-acid battery has a low cycle life and a relatively low energy density, it has the advantages of very low price and high cost performance. Therefore, in recent years, nickel-metal hydride batteries, lithium-ion batteries, sodium-sulfur batteries, etc., cannot completely replace lead-acid batteries in the field of energy storage. [0003] Currently, there is a battery based on internal ion exchange. The working principle of the battery is that the positive electrode is based on the extraction-intercalation reaction of the first metal ion, and the negative electrode is based on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/02H01M4/04H01M10/38
CPCH01M4/02H01M4/0452H01M4/13H01M4/62H01M4/628H01M10/38Y02E60/10Y02P70/50
Inventor 支键陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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