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Low-power rate type lithium ion battery

A lithium-ion battery and rate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of not having both high rate and high safety performance, and achieve high binder content, fast charging performance improvement, and adhesion. The effect of strong knot strength

Inactive Publication Date: 2022-05-13
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned one or more technical problems in the prior art, the embodiment of the present application provides a low power rate lithium-ion battery to solve the problem that the lithium-ion battery in the prior art cannot have both high rate and high safety. performance problem

Method used

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  • Low-power rate type lithium ion battery

Examples

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Embodiment approach

[0055] As an embodiment, the solid electrolyte particle may be a quasi-solid electrolyte, which contains a mixture of the non-aqueous liquid electrolyte solution and the solid electrolyte system detailed above, for example, including one or more ionic liquids and one or more A metal oxide particle (such as, aluminum oxide (Al 2 o 3 ) and / or silicon dioxide (SiO 2 )).

[0056] The second aspect of the present application provides a low-power high-rate lithium-ion battery, which includes a positive electrode, an electrolyte, and the aforementioned negative electrode.

[0057] Lithium-ion batteries are capable of generating electric current during discharge by reversible electrochemical reactions that occur when an external circuit is closed (to connect the negative and positive electrodes) and the negative electrode contains a relatively greater amount of available lithium. The chemical potential difference between the positive and negative electrodes drives the electrons gen...

Embodiment 1

[0080] In the embodiment of the present application, a rate-type lithium-ion battery is provided, especially a lithium-ion battery suitable for low-power fast charging, including a positive electrode structure and a negative electrode structure, and the negative electrode structure includes a current collector and an active negative electrode disposed on the current collector. material layer and a solid electrolyte layer, and the solid electrolyte layer is arranged on the negative electrode active material layer, the surface of the current collector is covered with a conductive layer, and the conductive layer is obtained by coating the conductive paste on the surface of the current collector through a carbon coating process. The negative electrode active material layer includes the first A negative electrode active material layer.

[0081] The graphene in the conductive paste is composed of 25wt% graphene with a particle size of 160nm and 70wt% graphene with a particle size of ...

Embodiment 2

[0085] The difference from Example 1 is that the first negative electrode active material layer is composed of 94.3wt% artificial graphite, 2.7wt% PVDF and 3wt% CNTs, and the second negative electrode active material layer is covered by 95.2wt% surface Composition of fast-charging graphite, 1.8wt% PVDF and 3wt% CNTs.

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Abstract

The invention provides a rate type lithium ion battery which comprises a positive electrode, an electrolyte and a negative electrode, the negative electrode comprises a current collector, a negative electrode active material layer and a solid electrolyte layer, the negative electrode active material layer and the solid electrolyte layer are arranged on the current collector, and the solid electrolyte layer is arranged on the negative electrode active material layer. The negative electrode active material layer comprises a first negative electrode active material layer close to the current collector and a second negative electrode active material layer close to the solid electrolyte layer, the first negative electrode active material layer comprises a first binder and a first negative electrode active material, and the second negative electrode active material layer comprises a second binder and a second negative electrode active material; the first negative electrode active material layer and the second negative electrode active material layer are arranged in parallel, the binding force provided by the binding agent of the first binding agent layer is greater than the binding force provided by the binding agent of the second binding agent layer, and the fast charging performance of the second negative electrode active material is superior to that of the first negative electrode active material. And the lithium ion battery with fast charge and safety performance is obtained.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a low-power-rate lithium-ion battery. Background technique [0002] Low-power batteries are usually used in small electric tools, which are characterized by good battery rate performance and high safety to meet the requirements of fast charging and discharging and high-frequency use. When designing a rate-type lithium-ion battery, it is often more inclined to reduce the thickness of the pole piece, which makes it difficult to coat the current collector with a solid electrolyte coating on the surface of the pole piece to improve battery safety, and the thickness of the battery pole piece is reduced. , so that the bonding strength between the pole piece and the current collector is reduced, which affects the actual use of the battery. [0003] On the other hand, setting a solid electrolyte layer on the pole piece is an effective way known in the prior art t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M10/0525H01M4/366H01M4/621
Inventor 李峥冯玉川刘冀鹏邱佳琳何泓材陈凯
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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