High-capacity all-solid-state lithium-sulfur battery

A lithium-sulfur battery, all-solid-state technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery life decay, reduced safety and stability of lithium-sulfur batteries, low Coulomb efficiency, etc., and achieves high conductivity. , High specific capacity, high theoretical effect

Inactive Publication Date: 2019-03-08
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the polysulfide Li produced by lithium-sulfur batteries during charging and discharging 2 S n (3≤n≤8) can penetrate the separator and shuttle back and forth between the positive and negative electrodes under the action of the concentration gradient, causing the shuttle effect, which will eventually cause irreversible loss of effective materials in the battery, attenuation of battery life and low Coulombic efficiency
In addition, the generation of lithium dendrites greatly reduces the safety and stability of lithium-sulfur batteries.

Method used

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Embodiment 1

[0020] A high-capacity all-solid-state lithium-sulfur battery, the battery includes a positive electrode, a negative electrode and a solid electrolyte. The positive electrode active material is a solid solution of lithium sulfide and lithium bromide obtained by a ball milling process. The molar ratio of lithium sulfide to lithium bromide is 0.8:0.2, the ball mill tank is zirconia, 90 4mm zirconia balls, and the ball milling time is 10hrs. The cathode material is made of Li 2 S-LiBr solid solution, conductive agent Super P and LGPS solid electrolyte are obtained by ball milling, and the mass ratio is 5:1:4. The ball mill jar is made of zirconia, 90 4mm zirconia balls, and the milling time is 10hrs. The positive electrode material is 5 mg, the solid electrolyte LGPS 70 mg is pressed into tablets, and the negative electrode is made of lithium indium alloy.

Embodiment 2

[0022] A high-capacity all-solid-state lithium-sulfur battery, the battery includes a positive electrode, a negative electrode and a solid electrolyte. The positive active material is a solid solution of lithium sulfide and lithium iodide obtained by a ball milling process. The molar ratio of lithium sulfide to lithium iodide is 0.8:0.2, the ball milling tank is zirconia, 90 4mm zirconia balls, and the ball milling time is 12hrs. The cathode material is made of Li 2 S-LiI solid solution, conductive agent VGCF and LGPS solid electrolyte are obtained by ball milling, and the mass ratio is 5:1:4. The ball mill jar is zirconia, 90 4mm zirconia balls, and the ball milling time is 12hrs. The positive electrode material is 5 mg, the solid electrolyte LGPS 70 mg is pressed into tablets, and the negative electrode is made of lithium indium alloy.

Embodiment 3

[0024] A high-capacity all-solid-state lithium-sulfur battery, the battery includes a positive electrode, a negative electrode and a solid electrolyte. The positive active material is a solid solution of lithium sulfide and lithium iodide obtained by a ball milling process. The molar ratio of lithium sulfide to lithium iodide is 0.7:0.3, the ball milling tank is zirconia, 90 4mm zirconia balls, and the milling time is 15hrs. The cathode material is made of Li 2 S-LiI solid solution, conductive agent VGCF and LGPS solid electrolyte are obtained by ball milling, and the mass ratio is 4:2:4. The ball mill jar is zirconia, 90 4mm zirconia balls, and the ball milling time is 15hrs. The positive electrode material is 5mg, the LGPS solid electrolyte is 55mg pressed into tablets, and the negative electrode is made of lithium indium alloy.

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Abstract

The invention discloses a high-capacity all-solid-state lithium-sulfur battery. The high-capacity all-solid-state lithium-sulfur battery comprises a positive electrode, a negative electrode and a solid-state electrolyte, wherein the solid-state electrolyte is arranged between the positive electrode and the negative electrode, a positive electrode material is powder obtained by mixing a positive active substance, a conductive agent and the solid-state electrolyte according to a certain mass ratio and then ball-milling, the positive active substance is a solid solution formed by ball-milling a lithium sulfide and a lithium halide according to a certain mole ratio, the negative is metal lithium or lithium magnesium alloy, lithium aluminum alloy and lithium indium alloy, and the solid-state electrolyte is a solid solution of different constituents of Li2S-P2S5, Li2S-P2S5-GeS2, Li2S-P2S5-P2S3 and Li2S-P2S5-P205 and Li2S-P2S5-LiX, and X is one or more of F, Cl, Br and I. The all-solid-statelithium-sulfur battery has the advantages of high voltage, large capacity, safety and environmental friendliness.

Description

technical field [0001] The invention relates to the field of all-solid-state lithium-ion batteries, in particular to a high-capacity all-solid-state lithium-sulfur battery. Background technique [0002] In recent years, the global new energy automobile industry has developed rapidly, and my country has also given great support to the new energy automobile industry. Power lithium battery is the core component of new energy vehicles, but the capacity of lithium ion batteries currently on the market is low, which has become a bottleneck restricting the further development of new energy vehicles. The traditional lithium-sulfur battery uses sulfur element as the positive electrode and metal lithium as the negative electrode. Its theoretical specific capacity is as high as 1675mAh / g, and the lithium-sulfur battery is low in cost and environmentally friendly. It is a high-capacity battery with development potential. [0003] However, the polysulfide Li produced by lithium-sulfur b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 武建飞周晓晓牛全海
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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