Composite 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 limiting the service life of lithium ion batteries, cumbersome preparation methods, poor electrolyte absorption, etc., and achieve high mechanical strength and good wettability , good effect

Active Publication Date: 2018-01-23
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 stirred tank containing 0.001g of TEMPO, 15g of NaClO and 0.01g of NaBr aqueous solution, 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 5m...

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 stirred tank containing 0.001g of TEMPO, 15g of NaClO and 0.01g of NaBr aqueous solution, 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 ...

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 stirred tank containing 0.001g of TEMPO, 15g of NaClO and 0.01g of NaBr aqueous solution, 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 5m...

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Abstract

The invention is a composite nanofiber lithium battery diaphragm and a preparation method thereof, characterized in that: the structure of the composite nanofiber lithium battery diaphragm includes an upper nanofiber film layer, a middle nanocellulose gel layer and a lower layer The nanofiber film layer is prepared by electrospinning method and sol-gel combination method to form a composite battery separator including a three-layer structure. The preparation steps of the composite nanofiber lithium battery separator are as follows: step (1) preparation Nanocellulose suspension; step (2) preparation of polymer electrospinning solution; step (3) electrospinning; step (4): the lower nanofiber membrane layer prepared in step (3) with a pH of 3 to 6 The acid solution infiltration; step (5) preparation of the middle layer of nano-cellulose gel layer; step (6) preparation of the upper layer of nano-fiber film layer; the prepared three-layer structure of the composite nanofiber lithium battery diaphragm finished product is a composite 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 Patents(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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