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Secondary battery with lithium-supplementing electrode and preparation method thereof

A technology for secondary batteries and lithium supplementation, which is applied in the manufacture of secondary batteries, electrolyte batteries, non-aqueous electrolyte batteries, etc., and can solve the problems of low first cycle and cycle efficiency.

Active Publication Date: 2021-07-20
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this kind of negative electrode can increase the energy density of the battery to 300wh / kg, but the first cycle and cycle efficiency of this kind of negative electrode are lower than that of the positive electrode

Method used

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  • Secondary battery with lithium-supplementing electrode and preparation method thereof
  • Secondary battery with lithium-supplementing electrode and preparation method thereof
  • Secondary battery with lithium-supplementing electrode and preparation method thereof

Examples

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example 1

[0046] A 1Ah lithium cobaltate / graphite soft-packed battery cell is prepared by stirring, coating, rolling, pole piece cutting, baking pole piece, and lamination. The capacity ratio N / P of the negative electrode material and the positive electrode material is about 1. After winding a layer of separator, place a lithium supplementary pole piece on the left side of the dry cell to make a lithium supplementary dry battery cell. The lithium supplementary pole piece includes a copper foil current collector and a metal lithium layer formed on the current collector. The tabs are welded for lithium-supplementing dry cells, wherein the tabs for lithium-supplementing are nickel tabs, then packaged and injected with electrolyte to form a secondary battery. Cycling is carried out at 0.5C, and 0.03Ah capacity of lithium is added to the positive electrode after charging in the first week, and the efficiency in the first week is 95%. After subsequent weekly charging, lithium with a capacity ...

example 2

[0048]A 1Ah lithium cobaltate / silicon negative electrode soft-packed battery is prepared by stirring, coating, rolling, pole piece cutting, baking pole piece, and lamination. The N / P ratio is about 1.1. After winding a layer of separator, On the left side of the dry cell, a lithium-aluminum alloy strip pole piece with a steel mesh current collector nickel tab is placed to make a lithium-supplemented dry cell. The tabs are welded for lithium-supplementing dry cells, and packaged into a casing to form a secondary battery. Cycling was performed at 0.5C, and 0.1Ah of lithium was added to the negative electrode after the first week of charging. After subsequent weekly charging, 0.14Ah capacity lithium was added to the silicon negative electrode. After 20 weeks of cycling, the Coulombic efficiency is 99.87%, and the capacity retention rate is 87.5%.

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Abstract

The invention relates to a secondary battery with a lithium-supplementing electrode and a preparation method thereof. According to an exemplary embodiment, a secondary battery may include: a positive electrode sheet and a negative electrode sheet separated from each other by a separator; and at least one lithium-replenishing electrode sheet including a lithium active layer, the at least one lithium-replenishing electrode sheet Also separated from the positive and negative electrode sheets by a separator. The secondary battery of the present invention can achieve high capacity, and has a lithium-supplementing pole piece so that lithium elements can be supplemented to the negative pole piece or the positive pole piece during the first or cycle process, so as to achieve high Coulombic efficiency and improve cycle characteristics.

Description

technical field [0001] The present invention generally relates to the field of new energy, and more particularly, relates to a secondary battery with a lithium-supplementing electrode, which can supplement lithium elements to the negative electrode sheet or the positive electrode sheet of the secondary battery during the first or cycle process, and also relates to A method of making such a secondary battery with a lithium-replenishing electrode. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements for the energy density, cost, cycle and safety of secondary batteries represented by lithium-ion batteries and sodium-ion batteries. Taking lithium-ion batteries as an example, conventional lithium-ion batteries mainly use graphite negative electrodes, and the theoretical capacity of graphite negative electrodes is 372mAh / g. The capacity of g is close to the limit of theoretical ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M10/0525H01M10/058
CPCH01M4/134H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄杰李文俊李泓
Owner BEIJING WELION NEW ENERGY TECH CO LTD