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Compound nanofiber lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and nanofiber film technology, applied in the field of lithium battery diaphragm and its preparation, can solve the problems of cumbersome preparation methods, limit the service life of lithium ion batteries, and poor electrolyte absorption, and achieve good wettability and high mechanical strength , good effect

Active Publication Date: 2016-02-24
上海展恒环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of conventional preparation methods such as cumbersome preparation methods and poor electrolyte absorption, the service life of lithium-ion batteries is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A composite nanofiber lithium battery diaphragm and a preparation method thereof, comprising the following steps:

[0023] A, step (1) prepare bamboo pulp nano-cellulose suspension:

[0024] (a) Soak 10.0g of bamboo fiber powder in 120g of 10% sodium hydroxide solution at a water bath temperature of 60°C, stir at a stirring speed of 400rpm for 1.5 hours, filter with a vacuum pump, and wash the resulting bamboo fiber To neutrality, the bamboo fiber powder is vacuum-dried, the vacuum degree is 0.1MPa, and the drying temperature is 70°C to obtain the alkali-treated bamboo fiber powder;

[0025] (b) At 20°C, weigh 5g of the alkali-treated bamboo fiber powder prepared in step (1), and add it to a stirring tank filled with TEMPO0.001g, NaClO15g and NaBr0.01g aqueous solutions, and the stirring speed is 700rpm , add 3% sodium hydroxide dropwise to adjust the pH value of the system to 9.5, and use a pH meter to monitor in real time. When the pH value is constant, add 5ml of ab...

Embodiment 2

[0035] A composite nanofiber lithium battery diaphragm and a preparation method thereof, comprising the following steps:

[0036] A, step (1) preparation of cotton pulp nanocellulose suspension:

[0037] (a) Soak 15.0g of cotton fiber powder in 120g of 10% sodium hydroxide solution at a water bath temperature of 60°C, stir at a stirring speed of 400rpm for 1.5 hours, filter with a vacuum pump, and wash the obtained cotton fiber with water To neutrality, the cotton fiber powder is vacuum-dried, the vacuum degree is 0.1MPa, and the drying temperature is 70°C to obtain an alkali-treated cotton fiber powder;

[0038] (b) At 20°C, weigh 5g of the alkali-treated cotton fiber powder prepared in step (1), and add it to a stirring tank filled with aqueous solutions of TEMPO0.001g, NaClO15g and NaBr0.01g, and the stirring speed is 700rpm , add 3% sodium hydroxide dropwise to adjust the pH value of the system to 10.0, and use a pH meter to monitor in real time. When the pH value is cons...

Embodiment 3

[0048] A composite nanofiber lithium battery diaphragm and a preparation method thereof, comprising the following steps:

[0049] A, step (1) prepare bamboo pulp nano-cellulose suspension:

[0050] (a) Soak 10.0g of bamboo fiber powder in 120g of 10% sodium hydroxide solution at a water bath temperature of 60°C, stir at a stirring speed of 400rpm for 1.5 hours, filter with a vacuum pump, and wash the resulting bamboo fiber To neutrality, the bamboo fiber powder is vacuum-dried, the vacuum degree is 0.1MPa, and the drying temperature is 70°C to obtain the alkali-treated bamboo fiber powder;

[0051] (b) At 20°C, weigh 5g of the alkali-treated bamboo fiber powder prepared in step (1), and add it to a stirring tank filled with TEMPO0.001g, NaClO15g and NaBr0.01g aqueous solutions, and the stirring speed is 700rpm , add 3% sodium hydroxide dropwise to adjust the pH value of the system to 9.5, and use a pH meter to monitor in real time. When the pH value is constant, add 5ml of ab...

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Abstract

The invention discloses a compound nanofiber lithium battery diaphragm and a preparation method thereof. The compound nanofiber lithium battery diaphragm is characterized in that the compound nanofiber lithium battery diaphragm structurally comprises an upper layer nanofiber diaphragm layer, a middle layer nanocellulose gel layer and a lower layer nanofiber diaphragm layer, and the compound battery diaphragm containing the three-layer structure is prepared by utilizing an electrostatic spinning method and a sol-gel combination method. The preparation method of the compound nanofiber lithium battery diaphragm comprises the following steps: step (1), preparing nanocellulose suspension liquid; step (2), preparing a polymer electrostatic spinning solution; step (3), performing electrostatic spinning; step (4), enabling the lower layer nanofiber diaphragm layer prepared in the step (3) to be infiltrated by acid liquor of which the pH is 3 to 6; step (5), preparing the middle layer nanocellulose gel layer; step (6), preparing the upper layer nanofiber diaphragm layer. The prepared three-layer-structure compound nanofiber lithium battery diaphragm final product is the compound battery diaphragm.

Description

technical field [0001] The invention relates to a lithium battery diaphragm and a preparation method thereof, in particular to a composite nanofiber lithium battery diaphragm and a preparation method thereof, which are applied in the field of batteries. Background technique [0002] The battery separator is an important part of the battery. Its function is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and at the same time allow the electrolyte ions to pass through smoothly. The battery separator is required to have the following properties: 1. Good chemical stability and resistance to organic solvents; 2. Good wettability to the electrolyte; 3. High mechanical strength and high puncture resistance; 4. In order to reduce resistance, the electrode area must be As large as possible, so the separator must be very thin; 5. When the battery system is abnormal, the temperature rises, the thermoplastic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/44H01M50/443H01M50/457
CPCH01M50/4295H01M50/44H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 张秀芳顾洲杰
Owner 上海展恒环保科技有限公司
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