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Aqueous binder and lithium battery containing the binder

A water-based adhesive, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high toxicity, pollute the environment, volatile, etc., and achieve the effect of improving the efficiency of the first week and improving the cycle performance

Active Publication Date: 2020-04-24
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the binder mainly used in lithium-ion batteries is the organic solvent-based binder polyvinylidene fluoride (PVDF), and the solvent N-methylpyrrolidone (NMP) of PVDF is volatile, highly toxic, and pollutes the environment.

Method used

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  • Aqueous binder and lithium battery containing the binder
  • Aqueous binder and lithium battery containing the binder
  • Aqueous binder and lithium battery containing the binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 0.5g of polyglutamic acid (molecular weight: 1,000,000) and put it in 10g of deionized water. Use a magnetic stirrer to stir for about 1 hour. After it is completely dissolved, add 0.2 g of a conductive agent (Super-P), continue to stir for 2 hours, and finally add 9.3 g of a silicon-carbon composite with a specific capacity of 450mAh / g, stir for 8 hours, and mix the obtained The paste was coated on copper foil with a thickness of 200 μm. Then place it in an air-blast oven at 80°C to dry, punch and weigh it, store it in a vacuum oven at 120°C for 24 hours, transfer it to a glove box to assemble it into a button cell, and let it rest for 12 hours.

[0033] The electrochemical performance test of the obtained button battery was carried out with the battery test system CT 2001A produced by Wuhan Landian Company. The discharge cut-off voltage of the test conditions was 0.005V, the charge cut-off voltage was 1V, and the charge-discharge rate was 0.5C.

[0034] see test...

Embodiment 2

[0036] Take 0.5 g of lithium polyglutamate (molecular weight: 1,000,000) and place it in 10 g of deionized water. Use a magnetic stirrer to stir for about 1 hour. After it is completely dissolved, add 0.2 g of a conductive agent (Super-P), continue to stir for 2 hours, and finally add 9.3 g of a silicon-carbon composite with a specific capacity of 450mAh / g, stir for 8 hours, and mix the obtained The paste was coated on copper foil with a thickness of 200 μm. Then place it in an air-blast oven at 80°C to dry, punch and weigh it, store it in a vacuum oven at 120°C for 24 hours, transfer it to a glove box to assemble it into a button cell, and let it rest for 12 hours.

[0037] The electrochemical performance test of the obtained button battery was carried out with the battery test system CT 2001A produced by Wuhan Landian Company. The discharge cut-off voltage of the test conditions was 0.005V, the charge cut-off voltage was 1V, and the charge-discharge rate was 0.5C.

Embodiment 3

[0039] Take 0.5 g of sodium polyglutamate (molecular weight: 1,000,000) and place it in 10 g of deionized water. Use a magnetic stirrer to stir for about 1 hour. After it is completely dissolved, add 0.2 g of a conductive agent (Super-P), continue to stir for 2 hours, and finally add 9.3 g of a silicon-carbon composite with a specific capacity of 450mAh / g, stir for 8 hours, and mix the obtained The paste was coated on copper foil with a thickness of 200 μm. Then place it in an air-blast oven at 80°C to dry, punch and weigh it, store it in a vacuum oven at 120°C for 24 hours, transfer it to a glove box to assemble it into a button cell, and let it rest for 12 hours.

[0040] The electrochemical performance test of the obtained button battery was carried out with the battery test system CT 2001A produced by Wuhan Landian Company. The discharge cut-off voltage of the test conditions was 0.005V, the charge cut-off voltage was 1V, and the charge-discharge rate was 0.5C.

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Abstract

The invention relates to a waterborne binder and a lithium battery containing the same. The binder comprises a component A and a component B, wherein the component A comprises one or more selected from a group consisting of polyglutamic acid as shown in a formula I which is defined in the specification and derivatives thereof; the mass fraction of the component A is 0.01 to 100%; and mass fraction of the component B is 0 to 99.99%. The binder is water-soluble, green and environment-friendly and can improve the first-cycle efficiency and cycle performance of the lithium battery. The lithium battery containing the binder has higher first-cycle efficiency and longer cycle performance.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a water-based binder and a lithium battery containing the binder. Background technique [0002] At present, lithium-ion batteries have the highest energy density among commercial batteries, and are widely used in various small electronic products and electric vehicles. In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the life and rate of lithium-ion batteries. [0003] Binder is an important part of lithium-ion batteries. Although its usage is small, it plays a vital role in lithium-ion batteries. The binder can bind the active material, the conductive agent and the current collector together, reduce the adverse effect of the volume change on the pole piece during the process of deintercalating lithium from the electrode material, and stabilize the internal structure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 褚赓陆浩刘柏男罗飞李泓陈立泉
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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