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Tin-containing negative electrode material, negative electrode, preparation method of negative electrode, negative electrode slurry, secondary battery and electric equipment

A technology of negative electrode material and negative electrode slurry, applied in secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of tin negative electrode pulverization and other problems, and achieve the effect of inhibiting volume expansion and pulverization

Active Publication Date: 2019-04-23
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a tin-containing negative electrode material to alleviate the current problem that the tin negative electrode is prone to swelling and pulverization during charging and discharging.

Method used

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  • Tin-containing negative electrode material, negative electrode, preparation method of negative electrode, negative electrode slurry, secondary battery and electric equipment
  • Tin-containing negative electrode material, negative electrode, preparation method of negative electrode, negative electrode slurry, secondary battery and electric equipment
  • Tin-containing negative electrode material, negative electrode, preparation method of negative electrode, negative electrode slurry, secondary battery and electric equipment

Examples

Experimental program
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Effect test

preparation example Construction

[0062] The method is a conventional slurry preparation method, the process is mature and stable, and the operation is convenient.

[0063] In this embodiment, the negative electrode slurry can be prepared by, for example, the following method: Weigh the tin particles, binder and conductive agent according to a certain weight ratio, put each material in a mortar, add an appropriate amount of organic solvent dropwise and grind evenly, Obtain the negative electrode slurry.

[0064] In other embodiments of the present invention, the negative electrode slurry can be prepared by the following method: providing a suspension composed of tin particles and an organic solvent, and dissolving an optional coupling agent in the suspension, and then Add the binder and the conductive agent and mix uniformly to obtain the negative electrode slurry.

[0065] First add the coupling agent to the suspension composed of tin particles and organic solvents, so that the coupling agent can fully conta...

Embodiment 1

[0091] This embodiment is a negative electrode, which includes a negative electrode current collector and a negative electrode material layer formed on the surface of the negative electrode current collector. The raw materials of the negative electrode material layer include nano-tin particles, an elastic binder and a conductive agent. Wherein, the negative electrode current collector is tin foil, the elastic binder is calcium alginate, and the conductive agent is polyethylene oxide PEO.

[0092] The preparation method of this negative pole comprises the following steps:

[0093] S1) Weigh 0.05g of conductive agent polyethylene oxide PEO, dissolve it in 5ml of N-methylpyrrolidone (NMP) and mix evenly, then add 0.05g of elastic binder and mix evenly to form a homogeneous solution;

[0094] S2) After cleaning 0.4 g of nano-tin particles, add them to the above-mentioned homogeneous solution, and mix them uniformly to obtain negative electrode slurry;

[0095] S3) Coating the obt...

Embodiment 2～15

[0097] Examples 2 to 15 are negative electrodes respectively, and the difference from Example 1 is that the elastic binder used is different, and the others are the same as Example 1. The selection of specific elastic adhesives in Examples 1-15 is shown in Table 1.

[0098] Table 1

[0099]

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Abstract

The invention provides a tin-containing negative electrode material, a negative electrode, a preparation method of the negative electrode, a negative electrode slurry, a secondary battery and electricequipment, and relates to the field of batteries. The tin-containing negative electrode material comprises the following components in percentage by weight: 70-90% of tin particles, 5-15% of an elastic binder and 5-15% of a conductive agent. The tin-containing negative electrode material can alleviate the technical problem of poor cycle performance caused by easy expansion and pulverization whenthe existing tin metal negative electrode is used as the negative electrode of the battery, and achieves the purpose of improving the cycle stability of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a tin-containing negative electrode material, a negative electrode and a preparation method thereof, negative electrode slurry, a secondary battery and electrical equipment. Background technique [0002] Tin-graphite dual-ion batteries have the advantages of higher specific energy density and lower cost. Its working mechanism involves the following process: during the charging process, the alloying reaction of the cation and the negative electrode occurs, and the anion intercalates into the graphite positive electrode; while during the discharge process, the de-alloying reaction of the negative electrode occurs, and the anion deintercalates from the graphite positive electrode. Due to the significant volume change and pulverization of tin in the negative electrode during the charging and discharging process. Therefore, surface modification of tin anode is of great significance in the re...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395H01M4/366H01M4/387H01M4/624H01M4/628H01M10/054H01M2004/027Y02E60/10
Inventor 唐永炳杨凯刘齐荣
Owner SHENZHEN INST OF ADVANCED TECH
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