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Binder for silicon-based negative electrode material and preparation method of binder

A technology of silicon-based negative electrode materials and binders, applied in battery electrodes, structural parts, electrical components, etc., to achieve the effects of improving toughness, improving Coulombic efficiency and capacity retention, and improving the stability of low-shear regions

Inactive Publication Date: 2020-06-23
江苏载驰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, silicon-based negative electrode materials also have certain defects. It is easy to react with the electrolyte to form a solid electrolyte interface (SEI) film during charging and discharging, which makes the first coulombic efficiency of lithium-ion lithium batteries (coulombic efficiency refers to the discharge capacity of lithium batteries and the same cycle The ratio of charging capacity during the process, that is, the percentage of discharging capacity and charging capacity

Method used

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  • Binder for silicon-based negative electrode material and preparation method of binder
  • Binder for silicon-based negative electrode material and preparation method of binder
  • Binder for silicon-based negative electrode material and preparation method of binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Modified PAA-Li adopts the following steps:

[0027] A lithium chloride saturated solution consisting of 55 vol% methanol, 25 vol% isopropanol and 20 vol% deionized water was formed at a temperature of 25°C. Disperse 50 g of PAA into 500 g of saturated lithium chloride solution, stir the resulting dispersion for 15 min, and separate the solid and liquid by filtration. The separated solid was redispersed into a saturated lithium chloride solution, stirred for 15 min, separated by filtration, and repeated three times. The separated product was washed with 500 g of solvent (20 vol% water, 55 vol% methanol and 25 vol% isopropanol), separated by filtration, and repeated three times. Dry at 55 °C for 12 h to obtain the final product.

Embodiment 2

[0029] Preparation of slurry:

[0030] (1) Weighing;

[0031] (2) Dissolve CMC and PAA-Li prepared in Example 1 in deionized water, and stir for at least 60 minutes to obtain a premix;

[0032] (3) Then add styrene-butadiene rubber (SBR) emulsion to the premix and stir for at least 30 minutes;

[0033] (4) Continue to add conductive agent and silicon-based negative electrode material (silicon carbon), and stir at high speed (10000rpm / min) for 1~2h.

[0034] The more specific ratio is shown in the table below:

[0035]

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Abstract

The invention provides a water-based binder for a silicon-based negative electrode material. The water-based binder comprises the following components in parts by weight: 1-10 parts of CMC, 6-40 partsof SBR and 4-20 parts of modified PAA. The components of the binder prepared by the method are good in intersolubility, so that agglomeration of the silicon-based negative electrode material can be reduced, and the flexibility of an electrode is improved. Meanwhile, the peeling strength and the cycle performance of the electrode are improved, and the initial Coulombic efficiency of a lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a binder for silicon-based negative electrode materials and its application in lithium batteries. Background technique [0002] In recent years, with the further implementation and promotion of the national new energy policy, the new energy automobile industry has achieved considerable development. However, the market demand for battery products with high energy density and high specific power is becoming more and more urgent. The development of high specific energy, low-cost lithium-ion electrode materials and related auxiliary materials is becoming the research and development focus of major battery manufacturers and material suppliers. Under the development trend of high energy density, the positive and negative electrode materials, diaphragm, electrolyte and other material systems of current lithium-ion power batteries are constantly being upgraded. In addition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/386H01M4/621H01M4/628H01M10/0525Y02E60/10
Inventor 徐旭昇赵明才汪炜
Owner 江苏载驰科技股份有限公司
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