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Lithium-supplementing negative electrode and application thereof

A technology for supplementing lithium and negative electrodes, which is applied to negative electrodes, battery electrodes, active material electrodes, etc., and can solve the problems of lithium precipitation risk, limited improvement in first-time charge-discharge efficiency and cycle performance of lithium-ion batteries, and low lithium supplementation efficiency. , to achieve the effect of improving cycle performance, inhibiting lithium dendrite phenomenon, and ensuring safety performance

Inactive Publication Date: 2021-07-09
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Negative electrode lithium supplementation refers to mixing lithium powder and negative electrode active material as the negative electrode active layer, or setting a lithium supplementary layer containing lithium powder on the negative electrode sheet. However, the increase in lithium powder content will cause the risk of lithium analysis. Therefore, negative electrode lithium supplementation is often The efficiency of lithium supplementation is not high, and the improvement of the first charge and discharge efficiency and cycle performance of lithium-ion batteries is limited

Method used

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  • Lithium-supplementing negative electrode and application thereof
  • Lithium-supplementing negative electrode and application thereof
  • Lithium-supplementing negative electrode and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of the present embodiment lithium replenishment negative electrode comprises:

[0057] 1. Lithium supplement slurry

[0058] In an environment with a humidity of 7 La 3 Zr 2 o 12 , electronic conductive agent SP, Al 2 o 3 , binder PTFE and inert lithium powder are dissolved in NMP solution to form a solid content of 38.2wt% and a viscosity of 2400mPa. s lithium supplement slurry;

[0059] The solid (non-NMP solution) in the lithium-supplementing slurry includes: lithium ion conductive agent LLZO 35wt%, conductive agent SP 2.0wt%, Al 2 o 3 20wt%, binder PTFE 3% and inert lithium powder 40%.

[0060] 2. Negative electrode active slurry

[0061] Mix the silicon-oxygen negative electrode with graphite to make a negative electrode material with a specific capacity of 500mAh / g (named SiO-500). After mixing SiO-500, conductive agent SP, and binder at a mass ratio of 92:4:4, Add appropriate amount of NMP to obtain negative electrode active slur...

Embodiment 2

[0068] The preparation method of the present embodiment lithium replenishment negative electrode comprises:

[0069] 1. Lithium supplement slurry

[0070] In an environment with a humidity of 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 (LATP), electronic conductive agent CNT, SiO 2 , binder PVDF and inert lithium powder are dissolved in NMP solution to form a solid content of 45.2wt% and a viscosity of 2400mPa. s lithium supplement slurry;

[0071] The solids in the lithium-supplementing slurry include: lithium ion conductive agent LATP 40%, conductive agent CNT0.5%, SiO 2 21.5%, binder PVDF 3% and inert lithium powder 35%.

[0072] 2. Negative electrode active slurry

[0073] Same as embodiment 1;

[0074] 3. Lithium supplement negative electrode

[0075] Coat the negative electrode active slurry on the upper surface of the Cu foil and dry and roll to form the negative electrode active layer, wherein the surface density of the negative electrode active layer is 8.0mg / cm 2 , the co...

Embodiment 3

[0079] The preparation method of the present embodiment lithium replenishment negative electrode comprises:

[0080] 1. Lithium supplement slurry

[0081] In an environment with a humidity of 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP), electronic conductive agent SP, boehmite, binder PTFE and inert lithium powder are dissolved in NMP solution to form a solid content of 32wt% and a viscosity of 1900mPa. s lithium supplement slurry;

[0082] The solids in the lithium-supplementing slurry include: 25wt% of lithium ion conductive agent LAGP, 0.5wt% of conductive agent SP, 22.5wt% of boehmite, 2% of binder PTFE and 50wt% of inert lithium powder.

[0083] 2. Negative electrode active slurry

[0084] Same as embodiment 1;

[0085] 3. Lithium supplement negative electrode

[0086] Coat the negative electrode active slurry on the upper surface of Cu foil and dry and roll to form the negative electrode active layer, wherein the surface density of the negative electrode active layer is 1...

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Abstract

The invention provides a lithium-supplementing negative electrode and application thereof. The lithium-supplementing negative electrode comprises a negative electrode current collector, a negative electrode active layer arranged on at least one functional surface of the negative electrode current collector and a lithium-supplementing layer arranged on the surface of the negative electrode active layer, wherein the lithium-supplementing layer comprises lithium powder and a lithium ion conductive agent. The lithium-supplementing negative electrode not only can efficiently supplement the active lithium loss of the lithium ion battery, but also can greatly reduce the lithium precipitation risk caused by lithium supplementation, thereby ensuring the cycle performance and safety of the lithium ion battery in the long-term application process.

Description

technical field [0001] The invention relates to a negative electrode sheet, in particular to a lithium-supplementing negative electrode and its application, and belongs to the technical field of secondary batteries. Background technique [0002] Lithium-ion battery is a kind of secondary battery which is widely used. At present, the composition of lithium-ion batteries mainly includes positive electrode, negative electrode, separator and electrolyte. In the specific application process, lithium ions will be consumed due to the formation of SEI film and the shedding of negative electrode active materials. In addition, as the energy density requirements of lithium-ion batteries are getting higher and higher, silicon-oxygen materials are gradually being used in lithium-ion batteries as negative electrode active materials with higher capacity, but silicon-oxygen materials are used in lithium-ion intercalation for the first time. Lithium oxides are formed during the process, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/38H01M4/131H01M4/133H01M4/36H01M4/48H01M4/587H01M10/0525
CPCH01M4/134H01M4/382H01M4/366H01M4/628H01M4/624H01M4/131H01M4/483H01M4/587H01M4/133H01M10/0525H01M2004/027Y02E60/10
Inventor 邱昭政李文龙赵育松赵俊年梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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