Lithium-ion secondary battery and its negative pole piece

A negative pole piece and secondary battery technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of limited improvement in the performance of lithium-ion secondary batteries and lack of lithium-ion conductivity, etc. Achieve good lithium-ion conduction performance, increase short-range conductivity, and prevent shedding

Active Publication Date: 2015-10-28
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these polymers themselves do not have lithium-ion conductivity, the improvement of the performance of lithium-ion secondary batteries is very limited.

Method used

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  • Lithium-ion secondary battery and its negative pole piece
  • Lithium-ion secondary battery and its negative pole piece
  • Lithium-ion secondary battery and its negative pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of conductive polymer

[0052] The air in a three-neck glass flask with an inner volume of 0.5 L was replaced with nitrogen, and ferric chloride (24 g) and chloroform (1 L) were added. Dissolve monomer M2 (weight average molecular weight 400, 30g), monomer M3 (weight average molecular weight 550, 10g) and monomer M1 (15g) in chloroform (300mL) and drop them into a three-necked glass flask under constant stirring middle. After stirring the mixture at room temperature for 20 h, it was added dropwise into methanol, and then the conductive polymer was separated by decanting. The conductive polymer was vacuum-dried at room temperature for 24 hours, and then vacuum-dried at 100° C. for 10 hours to obtain 36 g of conductive polymer P1 with a weight-average molecular weight of 150,000.

[0053] (2) Preparation of negative electrode sheet

[0054] The resulting conductive polymer was dissolved in NMP, and Si powder coated with carbon as the negative electrode ...

Embodiment 2

[0059] (1) Preparation of conductive polymer

[0060] The air in a three-necked glass flask with an inner volume of 0.5 L was replaced with nitrogen, and ferric chloride (27 g) and chloroform (1 L) were added. Dissolve monomer M20 (weight average molecular weight 400, 30g), monomer M5 (weight average molecular weight 400, 8g) and monomer M4 (30g) in chloroform (300mL) and drop them into a three-necked glass flask under constant stirring middle. After stirring the mixture at room temperature for 16 h, it was added dropwise into methanol, and then the conductive polymer was separated by decanting. The conductive polymer was vacuum-dried at room temperature for 24 hours, and then vacuum-dried at 100° C. for 10 hours to obtain 50 g of conductive polymer P2 with a weight-average molecular weight of 500,000.

[0061] (2) Preparation of negative electrode sheet

[0062] Dissolve the obtained conductive polymer in NMP, add carbon-coated Si powder used as negative electrode active m...

Embodiment 3

[0068] (1) Preparation of conductive polymer

[0069] The air in a three-necked glass flask with an inner volume of 0.5 L was replaced with nitrogen, and ferric chloride (27 g) and chloroform (1 L) were added. Dissolve monomer M8 (weight average molecular weight 750, 30g), monomer M7 (weight average molecular weight 600, 12g) and monomer M6 (25g) in chloroform (300mL) and drop them into a three-necked glass flask under constant stirring middle. After stirring the mixture at room temperature for 40 h, it was added dropwise into methanol, and then the conductive polymer was separated by decanting. The conductive polymer was vacuum-dried at room temperature for 24 hours, and then vacuum-dried at 100° C. for 10 hours to obtain 48 g of conductive polymer P3 with a weight-average molecular weight of 70,000.

[0070] (2) Preparation of negative electrode sheet

[0071] The obtained conductive polymer was dissolved in NMP, carbon-coated Si powder used as negative electrode active m...

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Abstract

The invention provides a lithium-ion secondary battery and a negative pole piece thereof. The negative pole piece of the lithium-ion secondary battery comprises a negative current collector and a negative diaphragm, wherein the negative diaphragm is arranged on the negative current collector and comprises a negative active material and a binding agent; the binding agent comprises a conductive polymer formed by crosslinking and polymerization of monomers with crosslinkable groups; the monomers has the structures of a molecular formula 1 and a molecular formula 2 (which are shown in the specification). The lithium-ion secondary battery comprises a positive pole piece, the negative pole piece, an isolating membrane and electrolyte, wherein the positive pole piece comprises a positive current collector and a positive diaphragm which is arranged on the positive current collector and comprises a positive active material; the isolating membrane is spaced between the positive pole piece and the negative pole piece; the electrolyte comprises lithium salt and a non-aqueous organic solvent. The lithium-ion secondary battery provided by the invention has good circulating performance and high-multiplying-power charging and discharging performances.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion secondary battery and its negative pole piece. Background technique [0002] Lithium-ion secondary batteries have been widely used in portable electronic products because they can be used at high voltage and have high energy density. However, with the development of miniaturization and multi-functionalization of electronic products, higher requirements are placed on the energy density of lithium-ion secondary batteries. [0003] As the most widely used negative electrode active material of lithium-ion secondary batteries, the capacity of graphitic carbon materials is close to its theoretical value (376mAh / g), but even if it is improved, its energy density is difficult to be further improved. In this context, alloy materials such as silicon and tin with higher theoretical energy density (capacity up to 4200mAh / g) have attracted widespread attention. However, the volume of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/122H01M4/13H01M4/622H01M10/0525Y02E60/10
Inventor 洪响钟开富
Owner NINGDE AMPEREX TECH
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