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A preparation method of porous/hollow-like carbon black material for lithium-sulfur batteries

A lithium-sulfur battery, hollow technology, applied in lithium batteries, battery electrodes, fibrous fillers, etc., can solve the problems of production cost and process complexity, and achieve good application potential, excellent performance, and good repeatability

Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a method for preparing a porous / hollow-like carbon black material for lithium-sulfur batteries in order to solve the problems of increased production cost and process complexity caused by etching and high-temperature sintering in the preparation of existing porous / hollow carbon materials

Method used

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  • A preparation method of porous/hollow-like carbon black material for lithium-sulfur batteries
  • A preparation method of porous/hollow-like carbon black material for lithium-sulfur batteries
  • A preparation method of porous/hollow-like carbon black material for lithium-sulfur batteries

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specific Embodiment approach 1

[0026] Embodiment 1: This embodiment illustrates the preparation method of the porous / hollow-like carbon black material used for lithium-sulfur batteries according to the following steps:

[0027] Take the carbon black material and concentrated nitric acid, add the concentrated nitric acid to the reaction kettle, then place the carbon black material on the separator, place the separator in the concentrated nitric acid and the upper surface of the separator is higher than the liquid level of the concentrated nitric acid, close the reaction After the hydrothermal reaction is completed, the solid product is washed with deionized water, and then filtered until the filtrate is neutral and colorless. The solid product after suction filtration is collected and dried to obtain a porous / hollow-like carbon black material.

[0028] 1. This embodiment uses carbon black material as raw material. After hydrothermal treatment with concentrated nitric acid, porous or quasi-hollow structures c...

specific Embodiment approach 2

[0033] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass fraction of the concentrated nitric acid is 65%-68%.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the carbon black material is SuperP, acetylene black or Ketjen black.

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Abstract

The invention discloses a method for preparing a porous / hollow-like carbon black material used in lithium-sulfur batteries, and relates to a method for preparing a carbon black material. The purpose of the method is to solve the problems of increasing production cost and process complexity caused by etching and high-temperature sintering during the preparation of existing porous / hollow carbon materials. The method of the present invention: take carbon black material and concentrated nitric acid, add concentrated nitric acid in the reactor, then place carbon black material on the separator, the separator is placed in concentrated nitric acid and the upper surface of the separator is higher than the liquid of concentrated nitric acid surface, close the reaction kettle, carry out hydrothermal reaction, wash the solid product with deionized water after the hydrothermal reaction is completed, then suction filter until the filtrate is neutral and colorless, collect the solid product after suction filtration and dry, that is, get Porous / hollow-like carbon black material. The invention can form a porous or quasi-hollow structure inside the carbon black particles, can be used as a sulfur carrier for a lithium-sulfur battery, and has a simple preparation method and low cost. The invention is applicable to the preparation of carbon materials for lithium-sulfur batteries.

Description

technical field [0001] The invention relates to a preparation method of carbon black material. Background technique [0002] In the new energy storage system, the theoretical specific energy of a lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg, which is much higher than the commercial secondary batteries used at this stage. The main source of its cathode is elemental sulfur, which has the advantages of abundant resources, cheap and easy access, environmental friendliness, and easy large-scale application, and has a good development prospect. [0003] However, there are still many problems in the lithium-sulfur battery system, which hinder its further practical application. The most typical ones are lithium polysulfide dissolution and the occurrence of shuttle effect. The long-chain lithium polysulfides formed during the reaction process, which are very soluble in ether electrolytes, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/56H01M4/62H01M10/052
CPCY02E60/10
Inventor 戴长松刘晨刘建超李如宏陈天瑞魏俊华万伟华王振孔繁荣张洪达
Owner HARBIN INST OF TECH
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