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Preparation method of silicon dioxide with high oil absorption value and high specific surface area for storage battery by precipitation method

A high specific surface area, silicon dioxide technology, applied in battery components, circuits, inorganic chemistry, etc., can solve the problems of affecting the service life of dimensional stability, affecting the acid weight loss of PE separators, and low specific surface area absorption value, etc. Achieve the effects of improving long-term stability, good practicability, and increasing BET specific surface area

Active Publication Date: 2021-11-05
ZHAOQING SANJIANG SILICON MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area and DBP absorption value of the silica prepared by this method are low, and the preparation process is prone to gel, resulting in low yield, and the amount of gel in the silica product will affect the acid weight loss of the PE separator , which affects the good dimensional stability and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 A precipitation method to prepare silica for storage batteries with high oil absorption value and high specific surface area

[0032] The precipitation method for preparing silicon dioxide for batteries with high oil absorption value and high specific surface area includes the following preparation steps:

[0033] S1, will be 30m 3 The sodium sulfate solution that the mass percentage concentration is 0.2wt.% is added in the reaction tank, then adds 1m 3 The sodium silicate aqueous solution with a concentration of 2.0mol / L is heated up to 60°C, and the pressure inside the tank is kept at 0.3MPa;

[0034] S2, under the condition that the stirring frequency is 10Hz, add 4m to the reaction tank 3 The dripping rate of / h dripping concentration is 3mol / L sulfuric acid solution, adjusts the pH value in the reaction tank to be 9, then stops adding acid, while keeping the pressure and temperature in the tank constant, the seed crystals obtained are aged for 30 minute...

Embodiment 2

[0038] Example 2 Preparation of silica for storage batteries with high oil absorption value and high specific surface area by a precipitation method

[0039] The precipitation method for preparing silicon dioxide for batteries with high oil absorption value and high specific surface area includes the following preparation steps:

[0040] S1, will be 33m 3 The sodium sulfate solution that mass percent concentration is 0.4wt.% is added in the reaction tank, then adds 1.5m 3 The sodium silicate aqueous solution with a concentration of 2.3mol / L is heated up to 70°C, and the pressure inside the tank is kept at 0.4MPa;

[0041] S2, under the condition that the stirring frequency is 30Hz, add 5m to the reaction tank 3 The dripping speed of / h dripping concentration is 3.5mol / L sulfuric acid solution, adjusts the pH value in the reaction tank to be 10, then stops adding acid, while keeping the pressure and temperature in the tank constant, the obtained seed crystals are aged for 60 ...

Embodiment 3

[0045] Example 3 Preparation of silica for storage batteries with high oil absorption value and high specific surface area by a precipitation method

[0046] The precipitation method for preparing silicon dioxide for batteries with high oil absorption value and high specific surface area includes the following preparation steps:

[0047] S1, will be 35m 3 The sodium sulfate solution that mass percent concentration is 0.6wt.% is added in the reaction tank, then adds 2m 3 The sodium silicate aqueous solution with a concentration of 2.5mol / L is heated to 80°C, and the pressure inside the tank is kept at 0.5MPa;

[0048] S2, under the condition that the stirring frequency is 50Hz, add 6m to the reaction tank 3 The dripping speed of / h dripping concentration is 4mol / L sulfuric acid solution, adjusts the pH value in the reaction tank to be 11, then stops adding acid, while keeping the pressure and temperature in the tank constant, the seed crystals obtained are aged for 90 minutes...

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Abstract

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a preparation method of silicon dioxide with a high oil absorption value and a high ASA specific surface area for a storage battery PE separator. The silicon dioxide is prepared by adopting a two-step method, the yield of the silicon dioxide is effectively improved by changing various conditions such as process conditions, concentration of reaction substances, reaction time, temperature and pressure intensity in the reaction process, and the obtained silicon dioxide has high oil absorption, high specific surface area, high dispersity and considerable hydrophilicity, and is good in practicability and suitable for being applied to the storage battery PE separator.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a preparation method and application of silicon dioxide with high oil absorption value and high specific surface area. Background technique [0002] The separator is an important component of the battery, it is placed between the positive and negative plates of the battery, the quality of the separator directly affects the discharge capacity of the battery and the service life of the charge-discharge cycle. The separator has the following functions in the battery, one is to prevent the positive and negative plates from contacting each other and cause the internal short circuit of the battery; the other is to have a certain strength to withstand the variable force caused by the plate deformation, bending and active material falling off; The third is that a certain amount of electrolyte can be stored inside the separator to ensure the battery re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/193H01M50/417H01M50/491
CPCC01B33/193H01M50/417H01M50/491C01P2004/61C01P2006/12Y02E60/10
Inventor 马逸敏谭昊存梁少彬张文证曹晓庆
Owner ZHAOQING SANJIANG SILICON MATERIALS CO LTD
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