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Integrated interface-less solid electrolyte lithium ion battery and preparation methods thereof

A solid-state electrolyte and lithium-ion battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve problems such as poor contact tightness, low lithium-ion conductivity, and increased battery internal resistance. Achieve the effect of reducing the internal resistance of the battery, increasing the conductivity, and increasing the degree of bonding

Active Publication Date: 2016-05-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with the liquid electrolyte that can fully soak into the electrode pole piece, the polymer electrolyte has solid properties, and the conductivity of lithium ions in the solid electrolyte is much lower than that of the liquid electrolyte; and the gap between the polymer electrolyte and the electrode pole piece There is a problem of poor contact tightness
In addition, since the passivation film of the solid electrolyte is relatively stable, if the solid electrolyte used is poorly compatible with the electrode sheet, the passivation film will grow with time, thereby increasing the internal resistance of the battery.

Method used

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  • Integrated interface-less solid electrolyte lithium ion battery and preparation methods thereof
  • Integrated interface-less solid electrolyte lithium ion battery and preparation methods thereof
  • Integrated interface-less solid electrolyte lithium ion battery and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, an integrated lithium-ion battery was prepared by a coating method. In the integrated non-interface solid electrolyte lithium-ion battery, the positive current collector is aluminum foil, and the positive active material layer on the positive current collector is made of LiFePO 4 , SuperP, and binder; the negative electrode current collector is copper foil, and the negative electrode active material layer on the negative electrode current collector is composed of graphite, SuperP, and binder; the solid electrolyte material and the binder material both contain fluorine in the side chain The polyaryl ether sulfone lithium salt of sulfonimide group, its structural formula is as follows:

[0051]

[0052] The preparation method of the integrated non-interface solid electrolyte lithium ion battery is as follows: figure 1 shown, including the following

[0053] step:

[0054] (1) Preparation of binder solution

[0055] Dissolve the polyarylethersulfone...

Embodiment 2

[0063] In this example, the preparation method of the integrated non-interface solid-state electrolyte lithium-ion battery is basically the same as in Example 1, except that the solid-state electrolyte material and the binder are both poly(5-sulfonyl chloride-3-oxa) Perfluorosulfonamide polymer lithium salt, wherein the thickness of the solid electrolyte membrane is still about 150 μm.

Embodiment 3

[0065] In this example, the preparation method of the integrated non-interface solid electrolyte lithium-ion battery is basically similar to Example 2, except that the binder material is a heterogeneous material but poly(5-sulfonyl chloride-3-oxa ) a mixture of perfluorosulfonamide polymer lithium salt and polyvinylidene fluoride (PVDF) in a mass ratio of 1:1.

[0066] The preparation method of the integrated non-interface solid electrolyte lithium ion battery is as follows: figure 1 shown, including the following steps:

[0067] (1) Preparation of binder solution

[0068] Poly(5-sulfonyl chloride-3-oxa) perfluorosulfonamide polymer lithium salt is mixed with polyvinylidene fluoride (PVDF) at a mass ratio of 1:1; the mixture is dissolved in N- In methylpyrrolidone, after fully stirring for 12 hours, a binder solution based on fluorine-containing sulfonimide-based polymer was prepared.

[0069] (2) Making positive and negative pole pieces

[0070] 80 parts by weight of pre-...

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Abstract

The invention provides an integrated interface-less solid electrolyte lithium ion battery. An electrode binder and a solid electrolyte material of the solid electrolyte lithium ion battery contain the same material ingredient and preferably, contain the same fluorosulfonimide group-containing polymer material component. The electrolyte and the electrode material of the integrated interface-less solid electrolyte lithium ion battery have good compatibility. The electrolyte and the electrode material containing the fluorosulfonimide group have low lithium ion dissociation energy so that lithium ion conductivity is improved in charge and discharge and battery internal resistance is reduced. The invention also provides two integrated battery preparation methods which have simple production processes and realize high electrode active material layer uniformity. The preparation methods have a wide application prospect in the field of solid electrolyte lithium ion batteries and especially in the field of high-rate and high-capacity power solid electrolyte lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries and their manufacture, and in particular relates to an integrated interfaceless solid-state electrolyte lithium-ion battery and a preparation method thereof. Background technique [0002] At present, traditional lithium-ion batteries usually use toxic and leaky organic liquid electrolytes, so there are certain safety hazards and environmental pollution problems. The polymer lithium battery that appeared in the 1990s uses a solid or gel polymer electrolyte, so it has higher safety, stability and better environmental friendliness. In addition, polymer lithium-ion batteries also have the advantages of flexible shaping, high specific energy, wide electrochemical stability window, less capacity loss, and high volume utilization. They are the main development direction of lithium-ion batteries in the future. [0003] However, compared with the liquid electrolyte that can fully soak into the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058
CPCY02E60/10Y02P70/50
Inventor 薛立新杜冰聂锋秦德君温乐乐王健
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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