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Solid-state lithium battery and preparation method thereof

A solid-state lithium and solid-state electrolyte technology, applied in the field of solid-state lithium batteries and their preparation, can solve the problems of poor lithium ion transmission power, poor electrode material matching, limited electrochemical window, etc., to improve comprehensive performance, improve electronic conductivity, The effect of reducing the interface resistance

Inactive Publication Date: 2021-05-11
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with liquid lithium batteries, which are affected by the overall structure and electrochemical window, solid lithium batteries are more likely to have high energy density. However, traditional organic solid electrolytes cannot meet practical requirements due to their limited electrochemical window and low room temperature conductivity.
At the same time, traditional inorganic ceramic electrolytes have disadvantages such as large interface impedance and poor matching with electrode materials.
Moreover, the lithium ion transport kinetics at the interface between the solid electrolyte and the solid electrode is poor, so solid lithium batteries still need to be further improved to improve electrical performance

Method used

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  • Solid-state lithium battery and preparation method thereof

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preparation example Construction

[0052] The embodiment of the present invention also discloses a preparation method of a solid-state lithium battery, comprising the following steps:

[0053] Mix the cathode material and MOFs evenly to obtain a mixture;

[0054] Sintering the mixture under the protection of nitrogen or an inert gas to obtain a modified positive electrode material; the modified positive electrode material includes a positive electrode material and a carbon-metal oxide composite material coated on the surface of the positive electrode material;

[0055]The positive electrode formed by the modified positive electrode material, the negative electrode and the MOFs-based composite solid electrolyte are assembled to obtain a solid lithium battery.

[0056] The modified positive electrode material or MOFs involved in the present invention can be prepared by any existing preparation method or according to the method of the embodiment of the present invention, and can also be directly obtained from comm...

Embodiment 1

[0073] Preparation of Precursor Mn by Carbonate Co-precipitation 0.54 Ni 0.13 co 0.13 (CO 3 ) 0.8 , and then weigh lithium carbonate and precursor dry ball milling and mix uniformly according to the total molar ratio of lithium and metal ions is 1.25:0.8. Put the mixture in a sagger, place it in a muffle furnace, pass in dry air, heat up to 450°C at a rate of 3.5°C / min, sinter for 4 hours, continue to heat up to 900°C, sinter for 15 hours, cool naturally, break up and dissociate , After passing through a 400-mesh sieve, the lithium-rich manganese-based cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 . Lithium carbonate is added in excess of 0.05wt% (that is, the added weighed amount is multiplied by 1.05wt%) to make up for the loss of lithium during the high-temperature sintering process.

[0074] Prepare Ti-MIL-125 by solvothermal method, dissolve the organic ligand phthalic acid in a mixed solvent of DMF and methanol, and mix it uniformly by ultrasonic to obtai...

Embodiment 2

[0087] By metal oxide and Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 The mass ratio of UiO-66 and Li is 5.0%:1. 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 Adding ethanol, ethanol and Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 The weight ratio is 2:1, stirred at a certain temperature until evaporated to dryness, put into a vacuum drying oven, and dried at 80°C for 8 hours to obtain a uniformly mixed powder.

[0088] Put the above powder in a sagger, put it into a muffle furnace, pass in argon gas, turn on the heating after 3 hours, sinter at 580°C for 10 hours, and obtain the lithium-rich manganese-based positive electrode material C / ZrO coated with carbon and zirconia after sieving 2 @Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 .

[0089] Mix the lithium-rich manganese-based positive electrode material coated with carbon and titanium oxide with the conductive agent SP and the binder PVDF according to the mass ratio of 80:10:10, and add NMP to form a slurry that is evenly coated on the aluminum...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a solid-state lithium battery and a preparation method thereof. The solid-state lithium battery comprises a positive electrode, a negative electrode and a solid-state electrolyte, and the solid-state electrolyte is an MOFs-based composite solid-state electrolyte; the positive electrode is made of a modified positive electrode material, and the modified positive electrode material comprises a positive electrode material and a carbon-metal oxide composite material coating the surface of the positive electrode material; and the carbon-metal oxide composite material is obtained by deriving MOFs. According to the invention, the carbon with an amorphous structure and the metal oxide uniformly and synergistically coat the surface of the positive electrode, and form the solid-state lithium battery with the MOFs-based composite solid-state electrolyte, so that the interface resistance is effectively reduced, the transmission of lithium ions is promoted, and the cycling stability and the rate capability are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a solid lithium battery and a preparation method thereof. Background technique [0002] As the only energy source of pure electric vehicles, the power battery directly affects the performance of the whole vehicle. Lithium-ion batteries have become a hot spot in the research of new power supply technology due to their advantages such as high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. [0003] Traditional liquid lithium batteries have safety problems such as poor thermal stability, flammability, and easy leakage. The use of solid electrolytes instead of liquid electrolytes is an effective way to solve the above problems. [0004] Compared with liquid lithium batteries, which are affected by the overall structure and electrochemical window, solid-state lithium batteries are more likely to have high energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M10/0525H01M10/0565H01M10/058
CPCH01M10/0525H01M10/058H01M10/0565H01M4/505H01M4/628H01M4/625H01M2004/028Y02P70/50Y02E60/10
Inventor 张鹏
Owner BEIJING ELECTRIC VEHICLE
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