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Anode of lithium-sulfur battery as well as preparation method and application of anode

A lithium-sulfur battery and negative electrode technology, applied in the field of secondary battery negative electrode materials and their preparation, can solve the problems of reducing electrode potential and mass specific capacity, etc.

Inactive Publication Date: 2018-02-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Use lithium alloy or lithium powder as the negative electrode of lithium-sulfur battery. Compared with pure metal lithium, the interface between lithium alloy and electrolyte is relatively stable, but the electrode potential and mass specific capacity are reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) A carbon-sulfur composite with a sulfur content of 70%, conductive carbon acetylene black, and a binder PVDF are prepared in a mass ratio of 8:1:1 to prepare a slurry, and coated on the carbon-coated aluminum foil of the current collector. After drying in a blast oven at 60° C., it was cut into positive electrode sheets of 30 mm×50 mm.

[0021] 2) Place the self-made or purchased lithium nitride ceramic target in the magnetron sputtering chamber, clean the lithium-boron alloy with a lithium content of 55% with an organic solvent, remove oil and dry it as a substrate, and keep the distance between the target and the substrate is 8cm, and then evacuated to make the vacuum of the sputtering chamber reach 1×10 -4 Pa, after vacuuming, fill the vacuum chamber with a mixture of nitrogen and argon, the filling speed is 40ml / min, the speed of nitrogen is 10ml / min, the speed of argon is 30ml / min, adjust the valve to make the vacuum chamber The pressure is 1 Pa.

[0022]The s...

Embodiment 2

[0026] 1) Analytical pure Li with a molar ratio of 1.5:0.3:1 2 CO 3 , La 2 o 3 、TiO 2 After the batching, the ball mill is fully mixed in the ball mill, and then the high temperature solid phase sintering is carried out in the muffle furnace at 800 ° C. After cooling, the product is taken out and ground and cold-pressed at 30 MPa. Sintered at 1000°C for 5h to obtain a Li-La-Ti-O target. The self-made Li-La-Ti-O target is placed in the magnetron sputtering chamber, and the lithium-boron alloy with a lithium content of 55% is cleaned and degreased with an organic solvent and dried as a substrate, keeping the distance between the target and the substrate is 8cm, and then evacuated to make the vacuum of the sputtering chamber reach 1×10 - 4 Pa, after vacuuming, fill the vacuum chamber with argon gas at a rate of 40ml / min, and adjust the valve so that the pressure of the vacuum chamber is 1Pa.

[0027] The sputtering power was adjusted to 45W, and the reverse sputtering trea...

Embodiment 3

[0031] 1) Analytical pure Li with a molar ratio of 7:1:4 2 CO 3 , ZnO, GeO 2 After the batching, the ball mill is fully mixed in the ball mill, and then the high-temperature solid-phase sintering is carried out in the muffle furnace at 1000 ° C. After cooling, the product is taken out and ground and cold-pressed at 30 MPa. Sintered at 1200 °C for 5 h to obtain Li 14 ZnG 4 o 16 Ceramic target. Will homemade Li 14 ZnG 4 o 16 The ceramic target is placed in the magnetron sputtering chamber, and the lithium-boron alloy with a lithium content of 64% is cleaned and degreased with an organic solvent and dried as a substrate. The vacuum degree of the chamber reaches 1×10 -4 Pa, after vacuuming, fill the vacuum chamber with nitrogen gas at a rate of 40ml / min, and adjust the valve so that the pressure of the vacuum chamber is 1Pa.

[0032] The sputtering power was adjusted to 45W, and the reverse sputtering treatment was performed at 400° C. for 10 minutes to further clean the...

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Abstract

The invention discloses an anode of a lithium-sulfur battery. The anode is a rolled lithium / boron alloy strip, and inorganic solid electrolyte film layers are prepared on surfaces of two sides of thealloy strip with a sputtering or evaporation method. The lithium / boron alloy is of a two-phase structure, wherein a lithium / boron compound phase is distributed in an alloy phase in a fibrous network structure, the lithium / boron compound can stably exist in an electrochemical cycling process and provides a mass transfer channel for free active lithium in the alloy, when the lithium / boron alloy withthe inorganic solid electrolyte films is prepared to serve as the anode of the battery, free metal lithium can permeate the inorganic solid electrolyte films with the lithium ion conduction functionthrough a skeleton structure in the alloy phase and can be subjected to an electrochemical reaction on an interface in the charge-discharge cycle process of the battery, and the inorganic solid electrolyte films attached to the skeleton structure cannot be separated from the skeleton structure due to dissolution or redeposition of metal lithium, so that the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the field of secondary battery negative electrode materials and preparation thereof, and in particular relates to a lithium-boron alloy negative electrode for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] The theoretical specific capacity of the metal lithium negative electrode is 3860mAh / g, and the exchange current of the metal lithium as the negative electrode is large, the dynamic performance is good, and the polarization is small. Lithium batteries using metal lithium as the negative electrode have higher specific energy than those using graphite and other negative electrodes, and have become the most concerned lithium metal secondary battery system. [0003] In recent years, scientific and technological workers have done a lot of work on the energy density, cycle performance, and safety performance of lithium batteries, and achieved good results. However, the market application of...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 陈剑徐磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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