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Composite diaphragm and application thereof

A composite diaphragm and diaphragm technology, applied in electrical components, electrochemical generators, batteries, etc., can solve the problems of ceramic electrolytes having no advantage in electrical conductivity, poor ion conductivity, and affecting the wettability of electrolytes, so as to improve power Chemical properties, improving ionic conductivity, and improving heat shrinkage resistance

Inactive Publication Date: 2020-12-04
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic coating will lead to a decrease in the porosity of the separator and affect the wettability of the electrolyte.
On the other hand, although ceramic electrolytes have ionic conductivity compared with inert ceramics, the conductivity of ceramic electrolytes still has no advantage over electrolytes. Therefore, when considering the overall performance of the composite separator-electrolyte, the coating After the ceramic coating is applied, the overall ion conductivity is degraded, which is why solid-state batteries have not been mass-produced and semi-solid batteries must add electrolyte to wet the interface.

Method used

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  • Composite diaphragm and application thereof
  • Composite diaphragm and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A composite separator that supports a cathode active lithium source and a ceramic electrolyte. A composite active lithium source and ceramic electrolyte coating is coated on a commercial PP porous separator. The mass composition of the coating material is 35% LATP+60% Li 2 CO 3 +4%NiO+1%PVDF, in which LATP particle size distribution range is 200-600nm, Li 2 CO 3 The particle size distribution range is 20-50nm, and the NiO particle size distribution range is 10-30nm. The coating method is not limited, and the micro-gravure coating process is typically used. After the composite diaphragm is fully baked, the coating thickness is ~3 μm, and the porosity of the diaphragm is 37% as measured by mercury intrusion porosimetry. The heat shrinkage test of the separator was carried out at 130 degrees Celsius, and the measured heat shrinkage rate was 0.8%. Use this diaphragm to assemble a button battery. The battery is composed of positive shell | stainless steel gasket | carbon-...

Embodiment 2

[0048] A composite diaphragm for loading cathode active lithium source and ceramic electrolyte, coating the composite active lithium source and ceramic electrolyte coating on the commercial PP porous diaphragm, the mass composition of the coating material is 40% LLTO+55% Li 2 C 2 o 4 +4%Co 3 o 4 +1%PVDF, in which LLTO particle size distribution ranges from 300 to 500nm, Li 2 C 2 o 4 The particle size distribution range is 20-50nm, Co 3 o 4 The particle size distribution range is 10-20nm, and the coating method is the same as in Example 1. After the composite diaphragm is fully baked, the thickness of the coating is ~2 μm, and the porosity of the diaphragm is 36% as measured by mercury intrusion porosimetry. The heat shrinkage test of the separator was carried out at 130 degrees Celsius, and the measured heat shrinkage rate was 0.9%. Use this diaphragm to assemble a button battery. The battery is composed of positive shell | stainless steel gasket | carbon-coated alumi...

Embodiment 3

[0053] The composite separator described in Example 1 is used as the separator, NCM811 is used as the positive electrode (specific capacity 190mAh / g), graphite / SiO mixture is used as the negative electrode (specific capacity 450mAh / g), and the N / P design value is 1.1, assembled into a pouch battery . After the battery cell is assembled, it is formed under the conditions of 300kgf and 45 degrees Celsius. The current condition of the formation is 0.05C, after charging for 30 minutes, then turn to 0.1C and charge for 2hrs; to 2.8V. The first charge capacity is 7.27Ah, the first discharge capacity is 5.95Ah, the first Coulombic efficiency is 81.8%; the reversible discharge capacity at 1C is 5.69Ah.

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Abstract

The invention discloses a composite diaphragm and application thereof. The composite diaphragm comprises a diaphragm matrix and an active lithium source coating, wherein the active lithium source coating is arranged on the diaphragm matrix, and the active lithium source coating comprises a nano active lithium source, a nano catalyst, a ceramic electrolyte and a binder. Therefore, multiple effectsof improving the safety of the battery, supplementing lithium and improving the conductivity of the diaphragm are achieved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite diaphragm and an application thereof. Background technique [0002] Lithium-ion batteries have high specific energy, excellent power performance, long cycle life, and no memory effect when charging and discharging, and their application fields are becoming more and more extensive. With the development of the new energy vehicle industry, the need for lithium-ion batteries as power batteries is becoming increasingly urgent, and its requirements for energy density and safety are also getting higher and higher. [0003] Lithium-ion batteries are mainly composed of positive electrodes, diaphragms, negative electrodes, and organic electrolytes. The charging and discharging process is a controlled electrochemical process. The positive and negative materials participating in the reaction are separated by the diaphragm, thereby realizing the control of the reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M10/0525
CPCH01M10/052H01M10/0525H01M2220/20Y02E60/10
Inventor 孙伟刘永飞赵启元张国军梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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