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Inorganic solid electrolyte layer of lithium battery, composite negative plate for lithium battery and preparation method and application of composite negative plate

A solid electrolyte, lithium battery technology, applied in electrolytes, negative electrodes, secondary batteries, etc., can solve the problem of not effectively improving the safety of acupuncture, the influence of the electrode or cell preparation process, and the overall performance of the cell to be optimized. and other problems, to achieve the effect of improved safety performance test results, compatible battery manufacturing process, and low synthesis difficulty.

Pending Publication Date: 2022-06-03
BEIJING WELION NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the sudden thermal runaway of acupuncture, the mechanism of the coating is often too late to work, and it cannot effectively improve the safety of acupuncture.
[0013] However, the above-mentioned methods such as ceramic diaphragm coating, use of electrolyte additives, construction of PTC coatings, construction of insulating or flame-retardant coatings, etc., will reduce the electrochemical performance of the battery on the one hand. It needs to be optimized; on the other hand, the material preparation process is complicated, or it also has a certain impact on the electrode or battery preparation process, and it is not easy to scale production

Method used

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  • Inorganic solid electrolyte layer of lithium battery, composite negative plate for lithium battery and preparation method and application of composite negative plate
  • Inorganic solid electrolyte layer of lithium battery, composite negative plate for lithium battery and preparation method and application of composite negative plate
  • Inorganic solid electrolyte layer of lithium battery, composite negative plate for lithium battery and preparation method and application of composite negative plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] A preparation method of a composite negative electrode sheet for a lithium battery,

[0127] (1) Inorganic solid electrolyte particles LiHAl (PO 4 )O 0.95 F 0.1 Mix well with solvent deionized water, grind and mix evenly, the particle size of inorganic solid electrolyte after grinding is 300nm; the mass ratio of inorganic solid electrolyte, binder SBR, dispersant sodium polyacrylate, wetting agent sodium perfluorooctanoate, and solvent is 100 : 3: 1.5: 0.5: 400 by adding and mixing to obtain the first slurry;

[0128] (2) The graphite particles of the negative electrode active material, the conductive agent SP, the binder SBR, the binder CMC and the solvent deionized water are uniformly mixed according to a mass ratio of 96:2:1.2:0.8:110 to prepare a second slurry; The second slurry was coated on the current collector copper foil with a doctor blade, baked at 110 degrees for 5 minutes, and rolled with a pressure of 50 t to obtain a negative electrode sheet;

[0129]...

Embodiment 2

[0139] The same preparation method as in Example 1 is adopted, except that the solid electrolyte material used is LiHAl (PO 4 )O 0.96 F 0.08 ; The size of the ground inorganic solid electrolyte particles is 287 nm, and the inorganic solid electrolyte particles LiHAl (PO 4 )O 0.96 F 0.08 , Binder SBR, dispersant sodium polyacrylate, wetting agent sodium perfluorooctanoate and solvent deionized water in a mass ratio of 100:0.3:0.5:0.5:200 to prepare the first slurry;

[0140] The composite negative electrode sheet for lithium batteries prepared by the above method includes a current collector, a negative electrode material layer and an inorganic solid electrolyte layer; the negative electrode material layer is located on the surface of the current collector; the inorganic solid electrolyte layer is located on the surface of the negative electrode material layer, and a small amount of inorganic solid The electrolyte layer partially penetrates into the negative electrode mater...

Embodiment 3

[0147] The same preparation method as in Example 1 is adopted, except that: the solid electrolyte material after grinding is 300nm LiHAl (PO 4 )O 0.95 F 0.1 with AlPO 4 mixture (mass ratio 1:1).

[0148] The composite negative electrode sheet for a lithium battery prepared by the above method includes a current collector, a negative electrode material layer and an inorganic solid electrolyte layer; the negative electrode material layer is located on the surface of the current collector; the inorganic solid electrolyte layer is located on the surface of the negative electrode material layer, and a small amount of inorganic solid The electrolyte layer is partially penetrated into the negative electrode material layer, and the thickness of the negative electrode material layer is 100um; the thickness of the inorganic solid electrolyte layer above the negative electrode material layer is 2.2um;

[0149] The battery system used is positive electrode LFP and negative electrode gr...

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Abstract

The invention discloses an inorganic solid electrolyte layer of a lithium battery, a composite negative plate for the lithium battery and a preparation method and application of the composite negative plate. The inorganic solid electrolyte layer comprises inorganic solid electrolyte particles; the inorganic solid electrolyte particles are selected from a lithium-containing material or a mixture of the lithium-containing material and AlPO4; the lithium-containing material comprises a compound consisting of lithium, hydrogen, aluminum, phosphorus, halogen and oxygen elements. The inorganic solid electrolyte used in the invention is high in stability and low in cost, and has certain ionic conductivity, and after the inorganic solid electrolyte is coated on the surface of the negative pole piece to form the composite negative pole piece, the ionic transmission capability on the surface of the negative pole piece and in the negative pole cannot be obviously hindered; and on the basis of not influencing the electrochemical performance, the thermal stability of the negative plate is improved, and the safety of the battery is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an inorganic solid electrolyte layer of a lithium battery, a composite negative electrode sheet for a lithium battery, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good cycle performance, long service life, low self-discharge, and no memory effect. They gradually occupy a larger application market in energy storage, power batteries and 3C electronics, and have broad application prospects. . [0003] As an important part of lithium-ion batteries, negative electrode materials are one of the main shortcomings that limit the performance of batteries such as energy density and rate. At present, the main anode materials include lithium titanate anode materials, graphite anode materials, hard carbon, soft carbon anode materials, silicon carbon, silicon oxygen, silicon oxygen c...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0071H01M2300/008H01M2300/0091H01M2004/027Y02E60/10
Inventor 杨琪邱纪亮闫昭张新华翁启东俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD