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Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as thermal runaway, reduced ionic conductivity, reduced battery energy density, etc., to prevent internal short circuits , the effect of ensuring safety and improving safety

Pending Publication Date: 2020-11-13
TSINGHUA UNIV +1
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Problems solved by technology

However, the above-mentioned approaches have the following problems: (1) they cannot fundamentally solve the fatal problem of battery separators, that is, dimensional instability at high temperatures
Due to the low melting point of traditional separator materials (PE and polypropylene), the separator is prone to size reduction or even melting under heated conditions, resulting in direct contact between the positive and negative electrodes of the battery, resulting in thermal runaway
(2) Due to the low efficiency of the aforementioned approach, in order to ensure the safety of the battery, a large amount of electrochemically inert materials need to be added to the separator, which leads to a decrease in the energy density of the battery, a decrease in the ionic conductivity inside the battery, and the response to extreme temperatures slow wait

Method used

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Examples

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Embodiment 1

[0039] 1. Preparation of GC-loaded paraffin microspheres:

[0040] GC-loaded paraffin microspheres were prepared by melt-dispersion technique. Paraffin (2.0 g) and Grubbs catalyst (100 mg) were first sealed in the same vial, and then the vial was immersed in an 82°C water bath. In a separate vial, 17.5 ml of a surfactant / water mixture containing 0.5% polyvinyl alcohol (5 ml) and deionized water (12.5 ml) was prepared and preheated to 82°C. The mixture of paraffin wax and Grubbs catalyst (hot solution) was then added dropwise to the preheated surfactant / water mixture submerged in a water bath at 82 °C, and the mixture was emulsified with mechanical agitation at 2000 rpm for 2 minutes. Deionized ice water (0 °C, 50 ml) was quickly added to the above emulsion to solidify the paraffin microspheres loaded with Grubbs catalyst. The prepared microspheres are rinsed with deionized water to remove excess surfactant, and dried under vacuum to obtain the obtained microspheres.

[0041...

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Abstract

The invention belongs to the field of batteries, and particularly relates to a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, the diaphragm comprises a base membrane and a coating formed on at least part of the surface of the base membrane, a coating material of the coating comprises core-shell structure microspheres,each core-shell structure microsphere comprises an inner core and an outer shell coating the inner core, the inner core comprises a Grubbs' catalyst, and the electrolyte comprises a polyfunctional monomer. The lithium ion battery provided by the invention can be used for efficiently and rapidly curing commercial liquid electrolyte under an overheating condition (such as 90 DEG C); therefore, further internal short circuit and thermal runaway of the lithium ion battery under an overheat condition are avoided, the safety of the lithium ion battery is guaranteed, and meanwhile, influence on theenergy density of the lithium ion battery is extremely small, so that the contradiction between the energy density and the safety of the lithium ion battery is overcome.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a lithium ion battery. Background technique [0002] As the energy density of lithium-ion batteries gradually increases, its safety has become a bottleneck that limits its large-scale application. In order to solve the safety problem of lithium-ion batteries, a recognized and fundamental method is to develop intrinsically safe battery constituent materials (such as separators, electrolytes, positive and negative electrodes, etc.). This can eliminate the potential safety hazards of batteries from the material level, and fundamentally solve the safety problems of lithium-ion batteries. People have developed such as novel safety separators, novel flame-retardant electrolytes, positive temperature coefficient coating materials, solid electrolytes, safe electrode material coatings, and so on. Among them, the separator is a key component to separate the positive and negative elec...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/058H01M10/42B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 刘凯袁梦琦
Owner TSINGHUA UNIV
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