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Preparation method of in-situ polymerization solid-state battery

A solid-state battery and in-situ polymerization technology, applied in the field of green energy storage, can solve problems such as high charging capacity, loss of active materials, and low Coulombic efficiency, and achieve the effects of improving cycle life, improving interface problems, and improving safety performance

Active Publication Date: 2018-09-04
武汉新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-scale commercial production of high-capacity lithium-ion batteries is still difficult due to the poor electrical properties of the active material and the dendrite problem on the surface of the negative metal lithium; among them, the loss of active materials is the most serious problem faced by lithium-ion batteries
During the charge and discharge process, the active material will dissolve and decompose in the traditional liquid ether electrolyte. From a theoretical point of view, this loss behavior is the main reason for the low Coulombic efficiency; Not going up, high charging capacity, low Coulombic efficiency
However, if a new type of all-solid electrolyte is used, the interior of the lithium-ion battery system is only solid-state to solid-state conversion, the reaction speed will be very slow, the polarization will be large, and the all-solid electrolyte has serious problems of interface resistance and low ion conductivity.

Method used

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  • Preparation method of in-situ polymerization solid-state battery
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  • Preparation method of in-situ polymerization solid-state battery

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preparation example Construction

[0022] A method for preparing an in-situ polymerized solid-state battery, comprising the following steps,

[0023] Step S1: Mix electrolyte salt, organic solvent, 1-10% by mass acrylate and 0.1-1% by mass initiator AIBN to form mixture I; wherein, the acrylate is tetraacrylic acid iso One or more of pentaerythritol triacrylate, allyl hydroxyethyl ether;

[0024] Step S2: Weigh the active material, acetylene black and PVDF at a mass ratio of 6:3:1 to make a positive electrode sheet, use the lithium sheet as the negative electrode, use the mixture I as the electrolyte, and use the polypropylene film as the diaphragm to assemble the battery;

[0025] Step S3: Put the battery in an oven, and after the battery is heated to 40°C-80°C, keep it for 1-30min. Such as figure 2 As shown, the mixture I after baking becomes a gel-state electrolyte, so that the electrode active materials are filled with the cured electrolyte, and the interfacial properties are improved.

[0026] The bene...

Embodiment 1

[0033] Embodiment 1. Preparation of lithium iron phosphate solid-state battery with isopentyl tetraacrylate and traditional electrolyte:

[0034] The mixture I is prepared by mixing electrolyte salt, organic solvent, isopentyl tetraacrylate with a mass percentage of 1-10% and initiator AIBN with a mass percentage of 0.1-1%. Wherein, the organic solvent is: a mixed solution of dimethoxymethane and dioxolane with a volume ratio of 1:1; the electrolyte salt is 1mol / L LITFSI and 1% LiNO by mass percentage 3 ;

[0035] Weigh lithium iron phosphate, acetylene black and PVDF at a mass ratio of 6:3:1 to make a positive electrode sheet, use the lithium sheet as the negative electrode, use the mixture I as the electrolyte, and use the polypropylene film as the diaphragm in an argon-filled glove Assemble a CR2032 button battery in the box; place the battery in an oven at 70°C, and keep it for 1-30 minutes after the battery is heated to 40°C-80°C.

[0036] Such as figure 1 As shown, th...

Embodiment 2

[0039] Embodiment 2. Preparation of ternary positive electrode (NCA1:1:1) battery with pentaerythritol triacrylate and traditional electrolyte:

[0040] The mixture I is prepared by mixing electrolyte salt, organic solvent, pentaerythritol triacrylate with a mass percentage of 1-10% and initiator AIBN with a mass percentage of 0.1-1%. Wherein, the organic solvent is: a mixed solution of dimethoxymethane and dioxolane with a volume ratio of 1:1; the electrolyte salt is 1mol / L LITFSI and 1% LiNO by mass percentage 3 ;

[0041] Weigh the ternary positive electrode material, acetylene black and PVDF with a mass ratio of 6:3:1 to make the positive electrode sheet, use the lithium sheet as the negative electrode, use the mixture I as the electrolyte, and use the polypropylene film as the diaphragm in an argon-filled environment. A CR2032 button battery is assembled in a glove box; the battery is placed in an oven at 70° C., and the battery is heated to 40° C.-80° C. and maintained ...

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Abstract

The invention relates to a preparation method of an in-situ polymerization solid-state battery. The preparation method comprises the following steps: step S1, mixing electrolyte salt, an organic solvent, 1-10 percent of acrylic ester and 0.1-1 percent of an initiating agent AIBN to prepare a mixture I, wherein the acrylic ester is one of or more of isopentyl tetraacrylate, pentaerythritol triacrylate and allyl hydroxyethyl ether; step 2, weighing an active substance, acetylene black and positive pole piece made by PVDF according to the mass ratio of 6:3:1, taking a lithium sheet as a negativeelectrode, taking the mixture I as an electrolyte and taking a polypropylene thin film as a diaphragm assembly battery; step S3, putting the battery in a drying box and maintaining for 1-30 minutes after the battery is heated to 40-80 DEG C. The preparation method provided by the invention has the benefit that by adopting an in-situ heat curing technology, the interface problem between the electrolyte and a battery anode and cathode can be better solved.

Description

technical field [0001] The invention belongs to the technical field of green energy storage, and in particular relates to a preparation method of an in-situ polymerized solid-state battery. Background technique [0002] Lithium-ion batteries are currently enjoying great success in powering mobile electronic devices. The theoretical specific capacity of the anode material for commercial lithium-ion batteries is about 120-200mAh / g. Due to the limitation of the theoretical specific capacity of the anode material of the battery, the actual energy density of the lithium-ion battery is further greatly increased to meet the requirements for long-term use. The requirements for electric vehicles or hybrid vehicles for distance transportation become even more difficult. [0003] In recent years, high-capacity lithium-ion batteries have received more and more attention. For example, in a lithium-sulfur battery, the theoretical specific capacity of the active material sulfur is 1675mA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565
CPCH01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 曹元成程时杰
Owner 武汉新能源研究院有限公司
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