Lithium supplementing material and preparation method and application thereof

A technology of lithium supplementation and lithium sulfate, which is applied in the field of lithium supplementation, can solve problems such as limited compatibility, and achieve the effects of good compatibility, reasonable cost, and improved cycle stability

Pending Publication Date: 2020-11-27
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Limited by battery system and actual process compatibility

Method used

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  • Lithium supplementing material and preparation method and application thereof
  • Lithium supplementing material and preparation method and application thereof
  • Lithium supplementing material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: this embodiment uses Li 4 SiO 4 As a lithium-containing compound, MoS 2 As a reducing agent, C 6 h 12 o 6 and C 12 h 22 o 11 As the conductive agent precursor, polyvinylidene fluoride (PVDF) is used as the binder, 1-methyl-2-pyrrolidone (NMP) is used as the solvent, and Super-P is used as the positive electrode conductive additive to make the positive electrode sheet.

[0039] 1. Weigh 3g of NMP into the mixing tank, add 0.1g of PVDF into the NMP, stir well to make it evenly dispersed, and then add 0.64g of Li 4 SiO 4 , 0.16g of MoS 2 And add 0.1g of Super-P into the mixing tank, stir again to disperse evenly, then evenly coat the slurry on the surface of aluminum foil, and dry it in an oven at 55°C for 6h. The dried pole pieces were punched into discs with a diameter of 12mm, and transferred to a vacuum oven at 120°C for 6 hours. After the temperature dropped to room temperature, the pole pieces were quickly transferred into a glove box filled w...

Embodiment 2

[0049] Embodiment 2: this embodiment uses Li 4 SiO 4 As a lithium-containing compound, MoS 2 As a reducing agent, C 6 h 12 o 6 As the conductive agent precursor, polyvinylidene fluoride (PVDF) is used as the binder, 1-methyl-2-pyrrolidone (NMP) is used as the solvent, and Super-P is used as the positive electrode conductive additive to make the positive electrode sheet.

[0050] 1. Mix 1g Li 4 SiO 4 , 1g C 6 h 12 o 6 After mixing, put it into a tube furnace, and fire at 700°C with argon gas at high temperature for 6 hours, control the thickness of the coated carbon layer at 30nm, and then add 0.2gMoS 2 After mixing evenly, put it into an airtight container and heat it in a vacuum oven at 120°C for 4 hours to obtain a lithium-replenishing material. Weigh 3g of NMP into the mixing tank, add 0.1g of PVDF into the NMP, stir well to make it evenly dispersed, then add 0.8g of lithium supplement material and 0.1g of Super-P into the mixing tank, stir again to make it evenly...

Embodiment 3

[0057] Embodiment 3: This embodiment uses LiFePO 4 As the cathode material, Li 4 SiO 4 As a lithium-containing compound, MoS 2 As a reducing agent, C 6 h 12 o 6 As the conductive agent precursor, polyvinylidene fluoride (PVDF) is used as the binder, 1-methyl-2-pyrrolidone (NMP) is used as the solvent, and Super-P is used as the positive electrode conductive additive to make the positive electrode sheet. 1g Li 4 SiO 4 with 1g of C 6 h 12 o 6 After mixing, put it into a tube furnace, and fire at 700°C with argon gas at high temperature for 6 hours, control the thickness of the coated carbon layer at 30nm, and then add 0.2gMoS 2 After mixing evenly, put it into an airtight container and heat it in a vacuum oven at 120°C for 4 hours as a lithium supplement material.

[0058] 1. Weigh 3g of NMP into the mixing tank, add 0.05g of PVDF into the NMP, stir well to disperse it evenly, then add 0.9g of LiFePO 4 and 0.05g Super-P were added into the mixing tank, stirred again ...

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Abstract

The invention discloses a lithium supplementing material for a lithium secondary battery as well as a preparation method and application thereof. The lithium supplementing material comprises a lithium-containing compound and an inorganic nonmetal reducing agent. According to the lithium supplementing material provided by the invention, inorganic sulfide is used as a reducing agent; meanwhile, metal and nonmetal catalysts are added; the potential of the lithium supplementing agent for exerting the capacity can be effectively reduced, and no gas is generated in the process of releasing lithium ions; the lithium supplementing material has good compatibility with the current commercial positive electrode and negative electrode, can be suitable for various battery systems, does not need to adjust and redesign an electrolyte and a battery manufacturing process, and is very suitable for the current secondary lithium ion battery. The preparation method of the lithium supplementing material provided by the invention is simple in process step, compatible with the existing lithium ion energy storage device preparation process, low in cost and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of lithium supplementation, in particular to a lithium supplementation material for a lithium secondary battery and a preparation method and application thereof. Background technique [0002] During the first cycle of lithium-ion energy storage devices, due to the formation of solid electrolyte interface (SEI) at the negative electrode interface, irreversible capacity loss occurs, and the reduction of active lithium content will lead to a decrease in the energy density of lithium-ion energy storage devices. In high specific energy storage devices, anode materials often need to choose materials with higher specific capacity to increase energy density, such as alloy anodes with high specific capacity. Compared with the graphite negative electrode, the alloy negative electrode needs to consume more active lithium during the first charging process, which reduces the Coulombic efficiency of the battery, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 闫勇田孟羽黄学杰詹元杰武怿达马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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