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Lithium battery and preparation method thereof

A lithium battery and metal lithium technology, which is applied in the manufacture of lithium batteries, electrolyte batteries, electrodes, etc., can solve the problems of poor storage performance of lithium ion batteries, easy formation of lithium dendrites, and inability to discharge at high rates of lithium primary batteries. Taking into account storage and rate performance, long cycle life, and the effect of improving specific energy

Inactive Publication Date: 2020-02-11
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium battery and its preparation method to solve the current technical problems of poor storage performance of lithium-ion batteries and the inability to discharge lithium primary batteries at a high rate. The special charging system of charging solves the problem that lithium dendrites are easily generated during metal lithium deposition, and can achieve long cycle life

Method used

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  • Lithium battery and preparation method thereof
  • Lithium battery and preparation method thereof
  • Lithium battery and preparation method thereof

Examples

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preparation example Construction

[0048] In terms of specific implementation, the preparation method of the lithium battery includes the following main steps:

[0049] Step 1: Prepare positive electrode

[0050] First, one or more kinds of lithium-containing metal composite oxides, conductive agents, and binders are fully mixed in a solvent in a certain proportion, and then the uniformly mixed slurry is coated on the upper and lower sides of the positive electrode current collector according to a certain surface density. On both sides, the solvent in the mixture is dried at the same time to obtain a semi-finished pole piece. Roll the semi-finished pole piece according to a certain compaction density, cut the pole piece according to a certain width, then dry the positive pole piece under vacuum conditions at a suitable temperature and time, and finally weld one or Multiple drained tabs are prepared to obtain the positive electrode;

[0051] Step 2: Preparation of Carbon Porous Electrode

[0052] First, one o...

Embodiment 1

[0073] This embodiment provides a cylindrical lithium battery, including a cylindrical stainless steel casing, a cover, a cell and an electrolyte disposed in the casing, and the cell is formed by intertwining a positive electrode, a separator, and a negative electrode.

[0074] Positive electrode adopts NCM 523 (LiNi 0.5 co 0.2 mn 0.3 o 2 ) as the active material (reversible gram capacity of 140mAh / g charged to 4.1V), using carbon black SP, carbon nanotube CNT composite conductive agent, polyvinylidene fluoride PVDF as the binder, and the electrode ratio is: Active material: Conductive agent: binder = 95:2.5:2.5.

[0075] The negative electrode is composed of a carbon porous electrode and a lithium metal layer. The active material in the carbon porous electrode is artificial graphite (reversible gram capacity of 350mAh / g), the conductive agent is carbon black SP, the binder is CMC and SBR, and the electrode ratio For: active material: conductive agent: binder = 94.8:2:3.2...

Embodiment 2

[0090] This embodiment provides a soft-pack lithium battery, which includes a square-shaped aluminum-plastic film casing, a battery cell and an electrolyte disposed in the casing, and the battery cell is formed by stacking a positive electrode, a separator, and a negative electrode in a zigzag shape.

[0091] The components and ratios of the positive and negative electrodes are exactly the same as in Example 1.

[0092] The diaphragm adopts a 12μm thick PE substrate, and one side is coated with a 4μm thick ceramic coating.

[0093] The electrolyte is lithium salt LiFP 6 A mixture dissolved in an organic non-aqueous solvent, wherein the organic non-aqueous solvent is LiFP with a concentration of 1.1mol / L 6 +EC / EMC / DEC / PP.

[0094] The preparation method of the flexible package lithium battery of the present embodiment is as follows:

[0095] 1. Prepare the positive electrode: use N-N dimethylpyrrolidone (NMP) as the solvent for the positive electrode active material, conduct...

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Abstract

The invention discloses a lithium battery, which comprises a positive electrode (1) and a composite negative electrode (2), wherein the positive electrode (1) comprises a positive electrode coating (7) formed on a positive electrode current collector (6); the composite negative electrode (2) comprises a carbon porous electrode layer (8) and a metal lithium plate electrode layer (9) which are formed on a negative electrode current collector (10); the reversible lithium de-intercalation capacity ratio of the carbon porous electrode layer (8) to the positive electrode coating (7) ranges from 0.1to 0.9; and a metal lithium plate electrode layer (9) is formed by electro-depositing a layer of compact metal lithium on the surface of the carbon porous electrode layer (8) in a bidirectional pulsecyclic charging mode in the battery formation activation stage. According to the lithium battery preparation method disclosed in the invention, the bidirectional pulse cyclic charging mode is adoptedin the battery activation stage, a compact metal lithium layer is deposited on the carbon porous electrode layer of a negative electrode, and the composite negative electrode is thus obtained. The lithium battery provided by the invention has the advantages of higher specific energy, high-rate discharge, long cycle characteristic and excellent storage performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery and a preparation method thereof. Background technique [0002] The self-discharge rate of lithium-ion batteries is high, that is, the storage charge capacity is poor, and the typical monthly capacity loss is 3% to 5%. Compared with lithium-ion batteries, the monthly capacity loss of traditional lithium primary batteries generally does not exceed 0.5%, but the rate performance of lithium primary batteries is worse than that of lithium-ion batteries. Even for power lithium primary batteries, the discharge rate does not exceed 1 Hourly rate, and the working voltage platform of lithium primary batteries is low, resulting in low output power. These shortcomings limit many applications of traditional lithium primary batteries. [0003] The key difference between lithium-ion batteries and lithium primary batteries is the negative electrode. Lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/04H01M10/052H01M10/058H01M10/0585H01M10/0587
CPCH01M4/133H01M4/1393H01M4/0445H01M10/052H01M10/058H01M10/0585H01M10/0587Y02E60/10Y02P70/50
Inventor 阳晓霞冯辉段征
Owner TIANJIN LISHEN BATTERY
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