Lithium ion battery and negative electrode composite electrode plate thereof

A lithium-ion battery and pole piece technology, which is applied to battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve problems such as poor cycle performance and high expansion rate, and achieve improved conductivity, reduced expansion rate, and improved Effects of cycle performance and liquid absorption capacity

Inactive Publication Date: 2017-07-21
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the high expansion rate and poor cycle performance of current silicon materials during use, one of the purposes of the present invention is to provide a silicon-carbon composite mate

Method used

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  • Lithium ion battery and negative electrode composite electrode plate thereof
  • Lithium ion battery and negative electrode composite electrode plate thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] A kind of preparation method of lithium-ion battery negative pole composite electrode, has the following steps:

[0019] 1. Preparation of solution A: Add 0.3g of silicon powder with a particle size of 50nm to 5mL of dimethylformamide (DMF), and then add 0.3g of polyoxyethylene-polyoxypropylene-polyoxyethylene substance ( Abbreviated as P123) ultrasonic dispersion to form a uniform suspension, then add 0.8g of tetrabutyl titanate (C 16 h 36 0 4 Ti, TBOT), 0.3g of deionized water and 0.3g of triethanolamine (C 6 h 15 NO 3 ), magnetically stirred to form a homogeneous mixed solution, then slowly hydrolyzed at room temperature for 12h, and finally added 0.3g of polymethylmethacrylate (PMMA) and 0.1ml of hydrogen peroxide with a concentration of 10% and magnetically stirred for 1h A homogeneous viscous suspension A is obtained.

[0020] 2. Preparation of pole piece B: Coat the suspension on a 10-micron copper foil, and dry it at 60°C for 8 hours to obtain a Si / TBOT / PM...

Embodiment 2

[0023] 1. Preparation of solution A: Evenly disperse 0.1g of silicon powder with a particle size of 30nm in 5mL of dimethylformamide (DMF), and then add 0.1g of polyoxyethylene-polyoxypropylene-polyoxyethylene substance (referred to as P123) ultrasonic dispersion to form a uniform suspension, then add 0.7g of tetrabutyl titanate (C 16 h 36 0 4 Ti, TBOT), 0.2g of deionized water and 0.25g of triethanolamine (C 6 h 15 NO 3 ), magnetically stirred to form a uniform mixed solution, then slowly hydrolyzed at room temperature for 12h, and finally added 0.2g of polymethylmethacrylate (PMMA) and 0.1ml of hydrogen peroxide with a concentration of 30% and magnetically stirred for 1h A homogeneous viscous suspension A is obtained.

[0024] 2. Preparation of pole piece B: Coat the suspension on the copper foil and dry it at 60°C for 8 hours to obtain the Si / TBOT / PMMA pole piece. Soak in lithium carbonate solution for 1 hour and dry to obtain pole piece B.

[0025] 3. Preparation of...

Embodiment 3

[0027] 1. Preparation of solution A: Evenly disperse 0.5g of silicon powder with a particle size of 100nm in 5mL of dimethylformamide (DMF), and then add 0.5g of polyoxyethylene-polyoxypropylene-polyoxyethylene substance (referred to as P123) ultrasonic dispersion to form a uniform suspension, then add 0.9g of tetrabutyl titanate (C 16 h 36 0 4 Ti, TBOT), 0.3g of deionized water and 0.35g of triethanolamine (C 6 h 15 NO 3 ), magnetically stirred to form a homogeneous mixed solution, then slowly hydrolyzed at room temperature for 12h, and finally added 0.4g of polymethylmethacrylate (PMMA) and 0.1ml of hydrogen peroxide with a concentration of 0.5% and magnetically stirred for 1h A homogeneous viscous suspension A is obtained.

[0028] 2. Preparation of pole piece B: Coat the suspension on the copper foil and dry it at 60°C for 8 hours to obtain the Si / TBOT / PMMA pole piece. Lithium carbonate solution was soaked for 5 hours, and pole piece B was obtained after drying.

[...

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Abstract

The invention discloses a lithium ion battery and a negative electrode composite electrode plate thereof. A preparation method for the negative electrode composite electrode plate comprises the steps of 1) preparing a solution A; 2) preparing a material B; and 3) preparing a silicon/titanium dioxide/carbon composite electrode plate. According to the prepared composite negative electrode plate, based on the zero-strain characteristic of the titanium dioxide material and a relatively high voltage platform, the expansion rate of the material in a charging-discharging process is lowered and the safety performance of the battery is improved; meanwhile, by virtue of a TiO<2>/C coating layer, the electrical conductivity of the composite material is improved, and volume change in a silicon cycling process can be effectively suppressed by virtue of a porous structure; in addition, TiO<2>/C, used as framework support, can provide a three-dimensional space transmission channel for lithium ion transfer; meanwhile, the negative electrode plate can be directly used without requiring a binder and a conductive agent; and the prepared composite negative electrode plate has the characteristics of high gram volume, excellent rate capability and strong liquid absorption and retention capability and the like, so that requirement of the high-specific-energy-density battery on the negative electrode material can be satisfied particularly.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, in particular to a lithium-ion battery negative electrode composite pole piece and the lithium-ion battery. Background technique [0002] Silicon carbon negative electrode material is a new type of negative electrode material developed in recent years, and it is used in high specific energy batteries due to its high capacity and other characteristics. However, during the use of silicon carbon negative electrode materials, pure silicon materials will not There is a huge volume change in the battery, which will lead to the pulverization of the prepared pole piece, causing the active material to fall off from the negative electrode plate, causing the separation of the electrode active material and the current collector, thereby seriously affecting the cycle performance of the battery; At the same time, the silicon material is very easy to agglomerate, resulting in poor cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/36H01M4/38H01M4/485H01M4/62H01M10/42H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/134H01M4/362H01M4/386H01M4/485H01M4/625H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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