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Negative pole piece and application thereof

A technology for a negative pole piece and a negative material layer, which is applied to the negative pole piece and its application fields, can solve the problems of low-potential film formation of electrolyte additives, co-insertion of solvents, deterioration of battery cycle performance, etc.

Active Publication Date: 2022-05-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, carbon materials are often used as battery negative electrode materials. Carbon materials can be divided into primary granular carbon materials and secondary granular carbon materials. Secondary granular carbon materials are materials obtained by secondary granulation using primary granular carbon materials as aggregates. Secondary granular carbon materials are more conducive to the intercalation / deintercalation reaction of active ions, which can improve the fast charging performance of the battery. However, because secondary granular carbon materials have more end faces, it is easy to cause solvent co-intercalation, low-potential film formation of electrolyte additives, etc. problems, leading to poor cycle performance of the battery

Method used

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  • Negative pole piece and application thereof
  • Negative pole piece and application thereof
  • Negative pole piece and application thereof

Examples

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preparation example Construction

[0032] In order to improve the electrochemical performance of the secondary battery, the present application has designed a new negative electrode sheet, the carbon-based material in the negative electrode sheet is a system in which the primary particle carbon material and the secondary particle carbon material are mixed; the secondary particle Carbon material refers to a carbon material prepared from primary granular carbon material or carbon-coated primary granular carbon material as aggregate through secondary granulation, and in the carbon-based material, the surface of the secondary granular carbon material Covered with a carbon overlay. In some embodiments, the thickness of the carbon coating layer is 5nm-50nm. In some embodiments of the present application, the preparation method of the secondary granular carbon material includes: using the primary granular carbon material as an aggregate, adding one or more of pitch and resin to it and performing secondary granulation,...

Embodiment 1

[0052] A kind of preparation of negative pole sheet:

[0053] 1) Preparation of negative electrode sheet

[0054] The carbon-based material is obtained by mixing the primary granular carbon material and the secondary granular carbon material coated with a carbon coating layer. Among the carbon-based materials, the primary granular carbon material is primary granular graphite;

[0055] The preparation method of the secondary granular carbon material coated with carbon coating comprises: mixing the primary granular graphite with the bonded pitch and treating it in a reactor for secondary granulation to obtain the secondary granular graphite, adding to the secondary granular graphite The coated asphalt is stirred and carbonized at a temperature lower than 1000°C for carbon coating, and then sieved and demagnetized to obtain secondary granular graphite coated with an amorphous carbon coating layer. Mix carbon-based material, conductive agent (carbon black), thickener (carboxymet...

Embodiment 2- Embodiment 13

[0063] The carbon-based material in Example 2-13 is a blended system of primary particle graphite and secondary particle graphite coated with a carbon coating layer. The difference from Example 1 is that the overall structure of the carbon-based material in Example 2-13 The parameters are different from those in Example 1, and the specific structural information is shown in Table 1.

[0064] A secondary battery was prepared by the same method as in Example 1.

[0065] In order to highlight the beneficial effects of the present application, the following comparative examples are provided.

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Abstract

The invention provides a negative pole piece and application thereof.The negative pole piece comprises a current collector and a negative pole material layer arranged on the surface of the current collector, the negative pole material layer comprises a carbon-based material, and the carbon-based material comprises a primary granular carbon material, a secondary granular carbon material and a carbon coating layer coating the surface of the secondary granular carbon material; the value of the performance factor i of the negative pole piece is 0.2-10, and the expression of the performance factor i is shown in the specification; wherein SSA is the specific surface area value of the carbon-based material, and the unit corresponding to the specific surface area value is m < 2 > / g; dv10, Dv50 and Dv90 are corresponding particle size values when the volume percentage of the carbon-based material reaches 10%, 50% and 90% respectively, and the unit corresponding to the particle size values is [mu] m; p is the porosity value of the negative electrode material layer; iD / IG is the peak height ratio of the D peak to the G peak of the Raman spectrum of the carbon-based material.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular to a negative pole piece and its application. Background technique [0002] The negative electrode material of the battery is an important part of the secondary battery, which has a great influence on the charging characteristics, battery capacity and battery life of the battery. At present, carbon materials are often used as battery negative electrode materials. Carbon materials can be divided into primary granular carbon materials and secondary granular carbon materials. Secondary granular carbon materials are materials obtained by secondary granulation using primary granular carbon materials as aggregates. Secondary granular carbon materials are more conducive to the intercalation / deintercalation reactions of active ions, which can improve the fast charging performance of batteries, but because secondary granular carbon materials have more end faces, it is easy to cau...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/587H01M4/62H01M4/13H01M10/0525
CPCH01M4/133H01M4/587H01M4/625H01M4/13H01M10/0525H01M2220/20H01M2004/027Y02E60/10
Inventor 齐成紫郝嵘彭宇东慈祥云
Owner BYD CO LTD
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