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Composite solid electrolyte and solid-state lithium battery

A solid-state electrolyte, solid-state lithium technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolytes, etc., can solve the problems of lithium dendrite growth, battery safety, and the ineffectiveness of protective layers or buffer layers, and achieves growth inhibition, Long-term growth, ensure the effect of normal charge and discharge

Active Publication Date: 2021-03-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solid-state lithium battery has excellent safety performance, there is still the problem of lithium dendrite growth, that is, during the battery cycle, the lithium dendrites generated at the negative electrode will pierce the solid electrolyte layer and reach the positive electrode, causing a short circuit between the positive and negative electrodes. raises battery safety concerns
In the current research, a protective layer or buffer layer is often used between the solid electrolyte layer and the metal lithium negative electrode to achieve the purpose of delaying the lithium dendrites from piercing the electrolyte layer. The growth of crystals and by-products, the protective layer or buffer layer will gradually lose its effectiveness, that is, this method cannot avoid the phenomenon of short circuit in the battery for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation of the above-mentioned solid-state lithium battery can be prepared by the following method:

[0036] (1) Coating the positive electrode active material slurry on the positive electrode current collector to obtain the positive electrode sheet C;

[0037] (2) The first solid electrolyte slurry E is sequentially coated on the positive electrode active material slurry of the positive electrode sheet C in step (1) 1 , barrier layer slurry P, second solid electrolyte slurry E 2 , to obtain the positive electrode sheet CE with composite solid electrolyte 1 PE 2 ;

[0038] (3) Coating the negative electrode active material slurry on the negative electrode current collector to obtain the negative electrode sheet A;

[0039] (4) The positive electrode sheet CE with composite solid electrolyte obtained in step (2) 1 PE 2 Press together with the negative electrode sheet A obtained in step (3) to obtain a solid lithium battery.

[0040] Among them, the first s...

Embodiment 1

[0046] (1) Production of positive electrode sheet C

[0047] First prepare the surface with LiNbO 3 Coated positive electrode active material, 1000gLiCoO 2 , 51mL of niobium ethoxide, 12g of lithium ethoxide, 1000mL of deionized water and 1000mL of ethanol were thoroughly mixed, and then added dropwise ammonia water until the pH reached 10 while stirring continuously, and the solution was evaporated to dryness, and the obtained powder was heated at 400°C for 8h. Get LiNbO 3 Coated LiCoO 2 .

[0048] Then, 930 g of coated LiCoO 2 Positive electrode active material, 150 gLi 10 GeP 2 S 12 Solid electrolyte material, 30 g binder butadiene rubber, 20 g acetylene black, and 20 g conductive agent carbon fiber were added to 1500 g solvent toluene, and then stirred in a vacuum mixer to form a stable and uniform cathode active material slurry. The positive electrode active material slurry was uniformly and intermittently coated on both sides of the positive electrode current col...

Embodiment 2

[0054] The same steps as in Example 1 were used to prepare a solid-state lithium battery, the difference being that:

[0055] In step (2), 20 g of Na 2 S 2 o 3 Place in 200 mL of toluene solution to prepare barrier layer slurry, and the rest of the steps and operations remain unchanged, wherein the thickness of the barrier layer is about 5 μm.

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Abstract

The invention provides a composite solid electrolyte. The electrolyte is of a layered structure and comprises at least one repeating unit, the repeating unit comprises a first solid electrolyte layer,a barrier layer and a second solid electrolyte layer which are arranged in sequence, the barrier layer contains a barrier material, the barrier material can react with lithium metal to generate an ion-non-conducting and electron-non-conducting insulating material. The barrier layer contains the barrier material capable of reacting with the lithium metal, so that lithium dendrites growing on the negative electrode can be completely prevented from piercing the solid electrolyte layer to reach the positive electrode, internal short circuit caused by contact between the positive electrode and thenegative electrode is avoided, and the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of solid lithium batteries, in particular to a composite solid electrolyte and a solid lithium battery. Background technique [0002] Compared with traditional lead-acid batteries and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, good cycle performance, and no memory effect, so they have been widely used and researched. Currently commonly used lithium-ion batteries use liquid electrolytes containing lithium salts and organic solvents as the medium for transporting lithium ions. Because organic solvents are volatile and have low melting points, adverse phenomena such as liquid leakage and flatulence are prone to occur during battery use, making Batteries have safety hazards such as fire and combustion, so improving the safety performance of batteries has become an urgent requirement. [0003] Solid-state lithium batteries use solid-state electrolytes to rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525H01M4/1391
CPCH01M4/1391H01M10/0525H01M10/056H01M10/058H01M2300/0071H01M2300/0094Y02E60/10Y02P70/50
Inventor 历彪郭姿珠胡屹伟
Owner BYD CO LTD
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