High-safety composite positive plate, preparation method thereof and applied lithium ion battery

A technology of lithium-ion batteries and composite positive electrodes, which is applied in the field of lithium-ion batteries, can solve problems such as ineffective inhibition of battery chain reactions, and achieve the effects of avoiding battery thermal runaway, reducing heat production, and inhibiting heat accumulation

Pending Publication Date: 2020-09-22
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high energy density systems, the "blocking" strategy cannot effectively suppress the occurrence of short circuits in the battery and the chain reactions it triggers.

Method used

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  • High-safety composite positive plate, preparation method thereof and applied lithium ion battery
  • High-safety composite positive plate, preparation method thereof and applied lithium ion battery
  • High-safety composite positive plate, preparation method thereof and applied lithium ion battery

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preparation example Construction

[0075] In order to prepare the high-safety composite positive electrode sheet provided by the present invention above, see figure 1 As shown, the present invention also provides a method for preparing a high-safety composite positive electrode sheet, comprising the following steps:

[0076] In the first step, the high thermal conductivity inorganic nanomaterials, conductive agents, lithium ion conductive materials, binders, dispersants and solvents are evenly mixed to prepare the functional material layer slurry to be coated;

[0077] In the second step, the functional material layer slurry is applied to the positive electrode of the lithium-ion battery (the positive electrode of the lithium-ion battery is an existing positive electrode sheet comprising a positive electrode active material layer, and the positive electrode active material layer is coated on the positive electrode by using a micro-gravure coating method. The upper and lower sides of the current collector) are c...

Embodiment 1

[0109] The preparation method of a kind of high-safety composite positive plate provided by the present invention and the lithium-ion battery used for it, the steps are as follows:

[0110]The first step, the preparation of the lithium-ion battery positive electrode (i.e. the existing common battery positive plate), the positive electrode ratio is, NCM811 (positive electrode active material): conductive agent (carbon black): binder (PVDF) = 95:2 :3.

[0111] The second step is the preparation of the functional material layer, using inorganic thermally conductive nanomaterials (hexagonal boron nitride), LLZO, CNT, binder PVDF, dispersant PVP, solvent NMP, etc. to prepare coating slurry. The percentage by weight of solid raw materials for the coating slurry is as follows: 60% for inorganic nano heat-conducting material, 20% for LLZO, 5% for CNT, 10% for binder, and 5% for dispersant. The solvent of the slurry is NMP, and the solid content of the slurry is 10%. Use a centrifuga...

Embodiment 2

[0117] The invention provides a method for preparing a high-safety composite positive electrode sheet and a lithium-ion battery applied thereto. The steps are as follows:

[0118] The first step is the preparation of the lithium-ion battery positive electrode (that is, the existing common battery positive electrode sheet), the positive electrode ratio is LCO: conductive agent (carbon black): binder (PVDF) = 95:2:3.

[0119] The second step is the preparation of the functional material layer, using inorganic thermally conductive nanomaterials (mixed materials of hexagonal boron nitride and alumina), LATP, graphene, binder PTFE, dispersant PVP, solvent NMP, etc. to prepare coating slurry . The percentage by weight of solid raw materials for the coating slurry is as follows: 30% for inorganic nano-thermal conductive materials, 50% for LATP, 3% for graphene, 12% for binders, and 5% for dispersants. The solvent of the slurry is NMP, and the solid content of the slurry is 10%. Use...

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Abstract

The invention discloses a high-safety composite positive plate, and comprises a lithium ion battery positive electrode. The upper side surface and the lower side surface of the lithium ion battery positive electrode are coated with at least one functional material layer; and the functional material layer comprises a high-thermal-conductivity inorganic nano material, a conductive agent, a lithium ion conductive material, a binder and a dispersing agent. The invention also discloses a lithium ion battery using the high-safety composite positive plate, and a preparation method of the high-safetycomposite positive plate. The invention discloses a high-safety composite positive plate and a preparation method and an applied lithium ion battery thereof. Starting from two angles of heat production and heat conduction, the concept of 'electricity/heat conduction (namely electricity and heat comprehensive conduction)' is introduced, 'less heat production and quick heat conduction' are realized,and heat accumulation caused by short circuit in the battery can be effectively inhibited, so thermal runaway is avoided, the safety of the high-energy-density lithium ion battery is further improved, and the lithium ion battery has important practical significance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-safety composite positive electrode sheet, a preparation method thereof and a lithium-ion battery for application. Background technique [0002] During the use of lithium-ion battery cells, modules or systems, internal short circuits will occur under overcurrent, overcharge, internal lithium dendrites, extrusion, mechanical shock, puncture or other abuses. When the accumulated Joule heat cannot be quickly diffused and discharged, an exothermic chain reaction will occur, triggering an exothermic reaction of large-area negative electrodes, positive electrodes, electrolytes, separators and other materials, eventually leading to thermal runaway of lithium-ion batteries. [0003] The traditional solution is the "blocking" strategy. Coating oxide and other granular materials with high mechanical strength on the surface of the diaphragm enhances the overall mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/136H01M10/0525H01M10/613H01M10/653H01M10/654H01M4/1391H01M4/1397
CPCH01M4/628H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0525H01M10/613H01M10/653H01M10/654H01M2004/021H01M2004/028Y02E60/10
Inventor 孟繁慧甄会娟周江李慧芳伍绍中
Owner TIANJIN LISHEN BATTERY
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