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Integrated lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode technology, applied in the field of integrated lithium-ion batteries based on Janus diaphragm and its preparation, can solve problems such as structural failure, interface relaxation, damage, etc., achieve small roughness, large roughness, and avoid damage Effect

Active Publication Date: 2022-04-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of interface relaxation and structural failure caused by volume changes in the traditional lithium-ion battery during charging and discharging, the present invention provides an integrated lithium-ion battery based on the Janus diaphragm to realize non-destructive composite between the diaphragm and the pole piece , to avoid damage to the original structure of the diaphragm or pole piece

Method used

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  • Integrated lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the Janus diaphragm is composed of polyimide high-temperature resistant support layer 1 and polyacrylic acid polar functional layer A and polytetrafluoroethylene-hexafluoropropylene non-polar functional layer B loaded on both sides of the high-temperature resistant support layer; the The thickness of the Janus separator is 18 μm, the porosity is 45.7%, the heat shrinkage rate is 0.0% (150°C, 2h), the surface energy of the polar functional layer is 45.8mN / m, and the surface energy of the non-polar functional layer is 16.3mN / m;

[0037] (1) Activate the A side of the Janus diaphragm at 55°C in ozone;

[0038] (2) Activate the B side of the Janus diaphragm at 35°C in N,N-dimethylformamide;

[0039] (3) Heat the Janus diaphragm and the positive and negative electrode sheets after steps (1) and (2) according to [negative electrode sheet / A-B / positive electrode sheet / B-A] or [B-A / negative electrode sheet / A-B / positive electrode sheet] The structural...

Embodiment 2

[0042] Such as figure 1 As shown, the Janus diaphragm is composed of titanium oxide high-temperature resistant support layer 1 and polyethylene oxide polar functional layer A and polytetrafluoroethylene non-polar functional layer B loaded on both sides of the high-temperature resistant support layer; the Janus diaphragm thickness 5μm, porosity 25%, thermal shrinkage rate 0.5% (150°C, 2h), surface energy of polar functional layer is 60.5mN / m, surface energy of non-polar functional layer is 15.8mN / m;

[0043] (1) Activate the A side of the Janus diaphragm at 45°C in nitric acid containing 5wt% ammonia;

[0044] (2) Activate the B side of the Janus diaphragm at 10°C in ethanol;

[0045] (3) Heat the Janus diaphragm and the positive and negative electrode sheets after steps (1) and (2) according to [negative electrode sheet / A-B / positive electrode sheet / B-A] or [B-A / negative electrode sheet / A-B / positive electrode sheet] The structural unit is obtained by pressing and combining. D...

Embodiment 3

[0048] Such as figure 1 As shown, the Janus diaphragm is composed of polyether ether ketone high temperature resistant support layer 1 and polypropylene oxide polar functional layer A and graphene nonpolar functional layer B loaded on both sides of the high temperature resistant support layer; the thickness of the Janus diaphragm is 50 μm, porosity 65%, thermal shrinkage rate 0.2% (150°C, 2h), the surface energy of the polar functional layer is 55.6mN / m, and the surface energy of the non-polar functional layer is 13.8mN / m;

[0049] (1) Activate the A side of the Janus diaphragm at 85°C in sodium perchlorate;

[0050] (2) Activate the B side of the Janus diaphragm at 45°C in N-methylpyrrolidone;

[0051] (3) Heat the Janus diaphragm and the positive and negative electrode sheets after steps (1) and (2) according to [negative electrode sheet / A-B / positive electrode sheet / B-A] or [B-A / negative electrode sheet / A-B / positive electrode sheet] The structural unit was obtained by pres...

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Abstract

The present invention relates to the technical field of lithium-ion batteries. In order to solve the problems of interface relaxation and structural failure caused by volume changes in traditional lithium-ion batteries during the charge and discharge process, an integrated lithium-ion battery and a preparation method thereof are provided. The lithium ion battery is composed of a Janus separator and a positive and negative electrode sheet. The Janus separator is composed of a high-temperature resistant support layer and polar functional layers and non-polar functional layers loaded on both sides of the high-temperature resistant support layer. The polar functional layer is fixed to the negative electrode sheet, and the non-polar functional layer is fixed to the positive electrode sheet. In the present invention, the A-side of the Janus separator is designed as a polar surface, which is beneficial to forming a stable and uniform SEI film on the negative electrode surface; the B-side of the Janus separator is designed as a non-polar surface, which ensures the electrochemical performance of the positive electrode and is conducive to the development of the positive electrode material. Higher capacity and rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an integrated lithium-ion battery based on a Janus diaphragm and a preparation method thereof. Background technique [0002] A lithium-ion battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. The separator is the isolation material between the positive electrode and the negative electrode of the battery, and is one of the key inner components. It has a great influence on the interface characteristics, internal resistance, and safety of the battery. significant impact. The separator can ensure the passage of ions in the electrolyte, and is used to prevent problems such as self-discharge and short circuit of the battery. [0003] Graphite anode materials for lithium-ion batteries have a volume change of about 20% in the lithium intercalation and delithiation states, which can easily lead to interface relaxation and structural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M50/457H01M50/489H01M50/491H01M10/0585
CPCH01M10/0525H01M10/0585Y02E60/10Y02P70/50
Inventor 宋有志刘涛宋明饶绍建李凡群
Owner WANXIANG 123 CO LTD
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