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A solid-state battery with controlled lithium dendrite growth

A solid-state battery and lithium dendrite technology, applied in the field of solid-state batteries based on this electrolyte, can solve problems such as potential safety hazards and easy triggering of short-circuit accidents, and achieve the effect of improving interface impedance and improving conduction efficiency

Active Publication Date: 2021-07-09
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of the energy density of lithium-ion batteries, it is difficult for the traditional graphite anode to meet the needs of the future energy situation. The theoretical capacity of the metal lithium anode reaches 3866 mAh / g, and it has excellent conductivity, which is a perfect anode material However, lithium dendrites are easy to grow on the surface of the negative electrode during the shuttle conduction process of lithium ions in the electrolyte, and the growth of lithium dendrites easily penetrates the separator, causing direct contact between the positive and negative electrodes of the battery and causing a short circuit, resulting in safety hazards
[0003] It is generally believed that the use of all-solid-state electrolytes can solve the problem of lithium dendrites, but in fact lithium dendrites still grow in all-solid-state electrolytes, especially for all-solid-state electrolytes with a garnet structure, lithium dendrites are very easy to grow along the solid-state electrolyte. Grain boundary growth between grains is easy to trigger short circuit accidents

Method used

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  • A solid-state battery with controlled lithium dendrite growth
  • A solid-state battery with controlled lithium dendrite growth

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This example prepares LiFePO 4 The material is the positive electrode, metal lithium is the negative electrode, Li 0.34 La 0.51 TiO 2.94 Solid-state button batteries with inorganic electrolytes. The preparation of the solid electrolyte and the carbon material coating and bonding process are as follows:

[0024] 1) Put an appropriate amount of carbon nanotubes into concentrated sulfuric acid solution, ultrasonicate for 6 h, and keep the acidification temperature at 55 °C.

[0025] 2) The carbon nanotubes treated with concentrated sulfuric acid are collected by filtration, and washed repeatedly with deionized water until the pH value of the last washing solution is in the range of 6-7.

[0026] 3) Weigh an appropriate amount of carbon nanotubes and polyvinylidene fluoride (PVDF) according to the mass ratio of 8:1, then add an appropriate amount of N-methylpyrrolidone (NMP) solvent, and use a homogenizer to fully stir the slurry for 30 minutes until the slurry No grai...

Embodiment 2

[0031] Prepared with Li[Ni 0.8 co 0.1 mn 0.1 ]O 2 The ternary material is the positive electrode, the metal lithium is the negative electrode, and the solid-state pouch battery with polyethylene oxide (PEO)-based polymer electrolyte. The preparation of the solid electrolyte and the carbon material coating and bonding process are as follows:

[0032] 1) Put an appropriate amount of modified graphene into concentrated nitric acid solution, ultrasonicate for 6 h, and keep the acidification temperature at 55 °C.

[0033] 2) The modified graphene treated with concentrated nitric acid is collected by filtration, and washed repeatedly with deionized water until the pH value of the last washing solution is in the range of 6-7.

[0034] 3) Weigh an appropriate amount of modified graphene and polyvinylidene fluoride (PVDF) according to the mass ratio of 8:1, then add an appropriate amount of N-methylpyrrolidone (NMP) solvent, and use a homogenizer to fully stir the slurry for 30 min...

Embodiment 3

[0039] Prepared with LiFePO 4 The material is the positive electrode, the metal lithium is the negative electrode, and the pouch battery of the organic-inorganic composite electrolyte. The preparation of the solid electrolyte and the carbon material coating and bonding process are as follows:

[0040] 1) Put an appropriate amount of carbon nanofibers into concentrated sulfuric acid solution, ultrasonicate for 6 h, and keep the acidification temperature at 55 °C.

[0041] 2) The carbon nanofibers treated with concentrated sulfuric acid are collected by filtration, and washed repeatedly with deionized water until the pH value of the last washing solution is in the range of 6-7.

[0042] 3) Weigh an appropriate amount of carbon nanofibers and polyvinylidene fluoride (PVDF) according to the mass ratio of 8:1, then add an appropriate amount of N-methylpyrrolidone (NMP) solvent, and use a homogenizer to fully stir the slurry for 30 minutes until the slurry No graininess and blends...

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Abstract

The invention discloses a preparation method and a battery of a solid electrolyte for controlling the orderly growth of lithium dendrites. Lamination with double-sided conductive adhesive, on the one hand, can control the growth direction of lithium dendrites in an orderly manner in the gap between the solid electrolyte and the metal lithium bonding surface, so that lithium dendrites can grow oppositely in the gap and avoid lithium dendrites. Piercing the solid electrolyte, on the other hand, the carbon coating can improve the interfacial impedance between the solid electrolyte and the cathode material and improve the conduction efficiency of lithium ions.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a preparation method of a solid-state electrolyte for controlling the orderly growth direction of lithium dendrites, and a solid-state battery based on the electrolyte. Background technique [0002] With the continuous improvement of the energy density of lithium-ion batteries, it is difficult for the traditional graphite anode to meet the needs of the future energy situation. The theoretical capacity of the metal lithium anode reaches 3866 mAh / g, and it has excellent conductivity, which is a perfect anode material However, lithium dendrites are easy to grow on the surface of the negative electrode during the shuttle conduction process of lithium ions in the electrolyte, and the growth of lithium dendrites easily penetrates the separator, causing direct contact between the positive and negative electrodes of the battery and causing a short circuit, resulting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0091H01M2300/0094Y02E60/10Y02P70/50
Inventor 王磊代化樊志民卢北虎裴波张一驰
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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