Preparation method of lithium sulfur battery membrane electrode

A lithium-sulfur battery and membrane electrode technology, which is applied in battery electrodes, electrode manufacturing, and electrolyte storage battery manufacturing, can solve the problems of lithium-sulfur battery capacity decline, unsatisfactory discharge performance, and poor cycle life, and achieve good electrode reaction reversibility , Improving the electrochemical kinetic performance and the effect of low internal resistance

Inactive Publication Date: 2014-11-19
ZHEJIANG UNIV
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Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
The reason is that there is no effective ion transport network established between the negative lithium sheet and the electrolyte membrane, and the irrationality of its structure leads to unsatisfactory discharge performance.

Method used

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  • Preparation method of lithium sulfur battery membrane electrode
  • Preparation method of lithium sulfur battery membrane electrode

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preparation example Construction

[0043] A method for preparing a lithium-sulfur battery membrane electrode, specifically comprising the steps of:

[0044] (1) Weigh the carbon carrier and ferrous sulfate, add them to 100mL deionized water, mix with ultrasonic vibration for 30 minutes to dissolve the ferrous sulfate, then heat to evaporate the water and deposit the ferrous sulfate on the surface of the carbon carrier to obtain the product; The product is heated up to 800-1000°C under the protection of nitrogen atmosphere, and reacted for 5 hours to obtain a carbon material with nanometer ferrous sulfide dispersedly distributed on the surface of the carbon carrier;

[0045] Wherein, the mass ratio of carbon carrier and ferrous sulfate is between 1:0.01~0.1, and the addition amount of carbon carrier is 10g, and the addition amount of ferrous sulfate is 0.1~1g; Described carbon carrier is commercial catalyst carbon carrier ; For example, the carbon black produced by Cabot Company is XC72, BP2000 and SP;

[0046]...

Embodiment 1

[0058] Example 1 Preparation of Nanoscale Ferrous Sulfide Loaded Macroporous Carbon Material

[0059] Take acetylene black (10g) and ferrous sulfate (0.1g) by mass ratio 1: 0.01, add to 100mL deionized water, ultrasonic vibration (ultrasonic frequency 40kHz) mixes for 30 minutes to dissolve ferrous sulfate; Depositing ferrous sulfate on the surface of acetylene black particles; raising the temperature of the product to 800° C. for 5 hours under the protection of nitrogen atmosphere; obtaining a carbon material with nanometer ferrous sulfide dispersedly distributed on the surface of acetylene black particles.

Embodiment 2

[0060] Example 2 Cathode material with sulfur loaded on carbon black

[0061] Weigh XC72 carbon black (10g) and ferrous sulfate (0.5g) at a mass ratio of 1:0.05, add them to 100mL deionized water, and mix with ultrasonic vibration (ultrasonic frequency 40kHz) for 30 minutes to dissolve ferrous sulfate; heat to evaporate the water Depositing ferrous sulfate on the surface of carbon black; raising the temperature of the product to 900° C. for 5 hours under the protection of nitrogen atmosphere to react; obtaining a carbon material with nanometer ferrous sulfide dispersedly distributed on the surface of carbon black.

[0062] Grind and mix elemental sulfur with the above-mentioned carbon material containing nano-ferrous sulfide as a sulfur storage material at a mass ratio of 10:1, place it in a 316 stainless steel reactor, heat it to 60°C after vacuuming, and complete the sulfur after 5 hours. load.

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Abstract

The invention relates to the technical field of a lithium sulfur battery, and aims at providing a preparation method of a lithium sulfur battery membrane electrode. The preparation method of the lithium sulfur battery membrane comprises the following steps: preparing a carbon material with nano ferrous sulfide being dispersed on the surface of a carbon carrier, and then preparing a positive electrode material by utilizing the carbon material; respectively preparing a positive electrode and a negative electrode as well as a lithium ion exchange membrane, and finally pressing the positive electrode, the negative electrode and the lithium ion exchange membrane into the lithium sulfur battery membrane electrode. The prepared lithium sulfur battery membrane electrode is good in conductivity, low in internal resistance, good in electrode reaction reversibility, good in chemical stability and thermal stability, low in price, easy to prepare, pollution-free, simple in battery manufacturing process, favorable for mass production and capable of effectively reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a method for preparing membrane electrodes of lithium-sulfur batteries. Background technique [0002] Traditional lithium-ion batteries use graphite as the anode material. Graphite has good electrical conductivity, high crystallinity, and good layered structure, which is suitable for lithium intercalation and deintercalation. Moreover, its lithium intercalation potential is low and flat, providing a high stable working voltage for lithium-ion batteries, which is roughly between 0.00 and 0.20V (vs.Li + / Li), its theoretical capacity is 372mAh g -1 (forming LiC 6 ). Metal aluminum can form up to Li with Li 9 al 4 alloys, compared to graphite and Li 4.4 Sn (994mAh g -1 ) has a high theoretical specific capacity (2234mAh g -1 ). In the process of lithium intercalation and extraction, the discharge and charge curves of the aluminum negative electrode present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/1397H01M4/04
CPCH01M4/0416H01M4/1397H01M10/058Y02E60/10Y02P70/50
Inventor 李洲鹏蔡文龙刘宾虹
Owner ZHEJIANG UNIV
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