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Solid electrolyte and solid lithium battery

A solid electrolyte and shell material technology, applied in electrolytes, electrolyte immobilization/gelation, secondary batteries, etc., can solve the problem that lithium dendrite growth cannot be well inhibited, and can inhibit the continued growth and reduce the occurrence of side effects. effect of likelihood of response

Inactive Publication Date: 2021-03-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the solid electrolyte layer with a protective layer structure in the prior art cannot well inhibit the growth of lithium dendrites, the present invention provides a solid electrolyte and a solid lithium battery, which inhibits the growth of lithium dendrites by coating the surface of solid electrolyte particles Lithium dendrite growth material, so that the electrolyte layer will not have the problem of cracking the protective layer, and even if a solid electrolyte particle fails to prevent the growth of lithium dendrites, other particles in the layer will prevent the growth of lithium dendrites, so that Improve battery safety performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Coating of solid electrolyte LLZO

[0038] Add 2g LLZO (particle size about 5μm) and 20mg LiF into 50mL water, stir and mix well, then continue to stir, and then obtain the coated solid electrolyte particles through a spray dryer, then cool down to room temperature, take out and dry and sinter at 500°C for 3h , to obtain LiF-coated LLZO (coating thickness is about 10nm).

[0039] (2) Production of positive electrode sheet C

[0040] Pass 8.8 g through LiNbO 3 Coated LiCoO 2 Cathode material (88%), 0.5g solid electrolyte Li 10 GeP 2 S 12 (5%), 0.3 g binder PVDF (3%), 0.2 g acetylene black (2%), 0.2 g conductive agent carbon fiber (2%) were added to 15 g solvent NMP (nitrogen methyl pyrrolidone), and then in Stir in a vacuum mixer to form a stable and uniform cathode slurry. The positive electrode slurry was evenly and intermittently coated on both sides of the positive electrode current collector aluminum foil (aluminum foil size: width 160 mm, thickness 16 μm...

Embodiment 2

[0049] The same steps as in Example 1 were used to prepare the core-shell solid-state electrolyte and all-solid-state lithium-ion battery of this example, the difference being that:

[0050] In step (1), using Li 3 N-coated LLZO solid electrolyte.

Embodiment 3

[0052] The same steps as in Example 1 were used to prepare the core-shell solid-state electrolyte and all-solid-state lithium-ion battery of this example, the difference being that:

[0053] In step (1), the LPS solid electrolyte is coated with LiF.

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Abstract

The invention provides a solid electrolyte. Solid electrolyte particles comprise an inner core material and a shell material coating the surface of the inner core material, the inner core material isselected from one or more of garnet type solid electrolyte, NASICON type solid electrolyte, LISICON type solid electrolyte, perovskite type solid electrolyte and chalcogenide solid electrolyte, and the shell material is selected from one or more of LiH, Li3B, Li2O, Li2S, Li3N, Li2HN, LiH2N, LiF, LiCl, LiBr, LiI, Li3P and Li2Se. According to the solid electrolyte layer, the problem that the protective layer is broken does not exist, and even if one solid electrolyte particle cannot prevent the growth of lithium dendrites, other particles in the layer also can prevent the growth of the lithium dendrites, so that the safety performance of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of solid lithium batteries, in particular to a solid electrolyte and a solid lithium battery. Background technique [0002] Traditional lithium-ion batteries use electrolytes containing organic solvents for the transmission of lithium ions, but organic solvents are volatile, have low ignition points, and are prone to problems such as liquid leakage and flatulence. In severe cases, the battery may even burn and explode, making the battery safe. Hidden danger. All-solid-state lithium batteries use solid-state electrolytes to replace the diaphragm and electrolyte in traditional batteries for the transmission of lithium ions, which is safer than organic electrolytes. At the same time, after using an all-solid electrolyte, metal lithium can be used as the negative electrode, which can also increase the energy density of the battery. [0003] However, in solid-state lithium batteries, due to the grain boundaries...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0085H01M2300/0091Y02E60/10
Inventor 胡屹伟郭姿珠历彪
Owner BYD CO LTD
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