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Method for reducing irreversible capacity loss of cathode material of lithium ion battery in initial charge

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, electrolytic organic material coatings, electrode manufacturing, etc., can solve problems affecting battery cycle life and safety performance, irreversible capacity loss of lithium-ion batteries, and affecting battery energy density. Achieve the effects of short preparation cycle, uniform and controllable thickness, and reduced loss

Active Publication Date: 2013-05-08
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the formation of SEI film will lead to the irreversible capacity loss of Li-ion batteries, which in turn affects the energy density of batteries
Secondly, if the formed SEI film is not uniform or dense enough, it will affect the cycle life and safety performance of the battery during the battery cycle.

Method used

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  • Method for reducing irreversible capacity loss of cathode material of lithium ion battery in initial charge
  • Method for reducing irreversible capacity loss of cathode material of lithium ion battery in initial charge
  • Method for reducing irreversible capacity loss of cathode material of lithium ion battery in initial charge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After mixing graphitized carbon fiber, conductive agent Super P, and binder PTFE in a mass ratio of 85:10:5, roll the negative electrode sheet on a double-roller machine and press it on the copper current collector as the negative electrode blank electrode sheet. Prepare 0.1 mol / L sulfuric acid and 0.1 mol / L aniline solution, pass through nitrogen, and dissolve evenly under magnetic stirring. The prepared negative electrode blank electrode was used as the working electrode, the Pt sheet electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode, and the prepared solution was used as the electrolyte to electrodeposit a layer of polymer on the surface of the electrode by cyclic voltammetry. Aniline (PANI). The scanning voltage was -0.2~1.2 V, the scanning rate was 1 mV / s, and the number of scanning segments was 100. The prepared polyaniline film-coated composite electrode was rinsed with deionized water, then wash...

Embodiment 2

[0033] After mixing the graphitized mesophase carbon microspheres, the conductive agent Super P, and the binder PTFE in a mass ratio of 85:10:5, roll the negative electrode sheet on a double-roll machine. Dissolve 50 mmol / L phenol and 0.3 mol / L NaOH in methanol solution under stirring with a magnetic stirrer. In the three-electrode system, the prepared electrode was used as the working electrode, the Pt sheet was used as the counter electrode, the saturated calomel electrode was used as the reference electrode, and the phenol solution was used as the electrolyte. Layer polyphenol (PPO). The scanning voltage range is 0~1.5V, the scanning rate is 10 mV / s, and the number of scanning segments is 30. The thickness of the obtained polymer layer is between 35nm and 50nm.

[0034] The SEM of the electrodeposited polyphenol on the surface of the pole piece is shown in image 3As shown, the graphitized mesophase carbon microsphere particles have been well covered, forming a uniform a...

Embodiment 3

[0036] After mixing natural graphite, conductive agent Super P, and binder PTFE in a mass ratio of 85:10:5, roll the negative electrode sheet on a double-roll machine. Dissolve 3 mol / L hydroquinone and 2 mol / L NaOH in methanol solution under stirring with a magnetic stirrer. In the three-electrode system, the prepared electrode is used as the working electrode, the Pt sheet is used as the counter electrode, the saturated calomel electrode is used as the reference electrode, and the hydroquinone solution is used as the electrolyte. Electrodeposit a layer of polyhydroquinone (PHQ). The scanning voltage range is 0-1.5 V, the scanning rate is 25 mV / s, and the number of scanning segments is 50. The thickness of the obtained polymer layer is between 8 and 10 μm.

[0037] Put the pole pieces prepared above in a vacuum oven, bake them at 100°C for 8 hours, and then assemble them into button half cells for electrical performance testing (the negative electrode is a lithium piece, and...

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Abstract

The invention relates to a method for reducing the irreversible capacity loss of the cathode material of a lithium ion battery in initial charge. A polymer coating layer of 0.01-10 microns is formed first on the surface of a cathode piece by adopting an electrochemical deposition method; the coating layer is a nano or micron-thick and uniform and dense polymer film, can effectively prevent direct contact between electrolyte and cathode surface, and partially realizes the function of an SEI film so as to reduce the irreversible capacity loss of the cathode material of the lithium ion battery in initial charge. Based on the charge / discharge process of a lithium ion battery and the forming mechanism of an SEI film and aimed at improving the battery circulation efficiency and the reversible capacity, the method provided by the invention is simple and easy to operate, has short preparation period and high efficiency, and can be applied to multiple lithium ion batteries taking other material as cathode.

Description

Technical field [0001] The present invention involves a method of reducing the first charging capacity of lithium -ion batteries for the first time. It specially involves a method of using electrochemical sedimentary negative poles to reduce lithium -ion batteries for the first time charging irreversible capacity loss. Background technique [0002] With the continuous development of society, energy has become the lifeblood of modern economy.With the continuous consumption of non -renewable energy, human demand for renewable energy is increasing.The characteristics of lithium -ion batteries can be recycled, high -ratio capacity, and long -cycle life. [0003] At present, commercial lithium ion batteries generally use graphite or non -fixed charcoal that can reverse lithium ions as negative electrode materials.During the first charging and discharge of lithium ion batteries, the organic electrolyte will be reduced and decomposed on the surface of the carbon negative, forming a laye...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04C25D9/02
CPCY02E60/122Y02E60/10
Inventor 蒋永赵兵陈丹丹苏玲刘瑞喆凌学韬焦正
Owner SHANGHAI UNIV
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