Lithium battery and manufacturing method thereof

A lithium battery and lithium salt technology, applied in the field of lithium battery and its production, can solve the problems of shortening the battery cycle life, unable to protect the electrode, and the collapse of the positive electrode of the battery, so as to avoid uneven distribution of local current density, good cycle performance, transmission uniform effect

Pending Publication Date: 2021-11-26

BYD CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

However, this kind of method makes the polymer electrolyte after in-situ polymerization not penetrate into the positive electrode well, but is mainly distributed on the battery separator, especially in the laminated battery, so the separator absorbs a large amount of liquid electrolyte monomer before polymerization, As a result, the polymerized polymer film is mainl...

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Method used

According to the disclosure, the polymer in the electrolyte can be produced by in-situ polymerization, and the in-situ construction of high interfacial compatibility by the in-situ polymerization method can greatly improve the interfacial impedance problem in the circulation process, and significantly improve the electrolyte contact with the interface between the electrodes.

As can be seen from Table 3, the cycle life of the lithium battery of the present disclosure in embodiment 1-8 is significantly higher than comparative example 1-3, and embodiment 4 by changing organic solvent, lithium salt and plasticizing in electrolyte The amount of the agent can further improve the cycle life of the lithium battery; and the average total polymer concentration of the lithium battery in Examples 1-8 at the end of the cycle is significantly higher than that of Comparative Examples 1-3, which shows the lithium battery of the present disclosure. The polymer concentration can gradually increase during the cycle, so that a multi-layer protective film can be formed on the surface of the positive electrode material as the battery cycles, and ultimately prolong the cycle life of the battery.

In a kind of embodiment according to the present disclosure, with respect to the solid initiator of 100 weight parts in slurry, the consumption of the organic solvent in electrolytic solution can be 150-4950 weight part, and the consumption of lithium salt can be 5-495 parts by weight; preferably, relative to 100 parts by weight of the solid initiator in the slurry, the amount of organic solvent in the electrolyte can be 250-4750 parts by weight, and the amount of lithium salt can be 25-475 parts by weight. The solubility of the lithium salt in the electrolyte of the present disclosure in carbonat...

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Abstract

The invention relates to a lithium battery and a manufacturing method thereof. The lithium battery comprises a positive plate, a negative plate, electrolyte and a diaphragm; the electrolyte contains a polymer and a lithium salt, the polymer is polycarbonate and/or polyether; and after at least one charge-discharge cycle, the concentration space gradient of the polymer in the electrolyte is gradually decreased along the direction from the positive electrode to the negative electrode, and the concentration space gradient of the lithium salt is gradually increased along the direction from the positive electrode to the negative electrode. The electrolyte disclosed by the invention contains the polycarbonate and/or polyether polymer and the lithium salt; and along with battery cycle, the concentration space gradient of the polymer is gradually reduced from the positive electrode to the negative electrode, and the concentration space gradient of the lithium salt is gradually increased from the positive electrode to the negative electrode, so that collapse of positive electrode material particles and formation of negative electrode lithium dendrites are avoided, the cycle life of the battery is prolonged.

Application Domain

Final product manufactureLi-accumulators +2

Technology Topic

PolycarbonateLithium dendrite +9

Image

Examples

Experimental program(8)
Comparison scheme(3)
Effect test(1)

Example Embodiment

[0039] Example 1

[0040] S1: Production of Cathode Sheet: 930g of the modified surface-treated cathode active material LiFePO 4 , 30g of PVDF binder, 20g of acetylene black, 20g and 2g of solid conductive agent HV initiator azobisisobutyronitrile (AIBN) was added to 1500g of NMP solvent is N-methylpyrrolidone, followed by stirring in a vacuum mixer to form a stable and homogeneous the positive electrode slurry. The positive electrode slurry was intermittently applied uniformly positive electrode collector foil (aluminum foil dimensions: width 160mm, thickness 16 m) on both sides, and then dried 393K, after the roll press and tableted to obtain a positive electrode sheet.

[0041] S2: Negative Electrode Sheet: In a glove box, a single-sided metal lithium foil having a thickness of 50μm cut to the appropriate size, then the metal lithium foil cut into a size of 45mm (length) × 58mm (width) in the drying room the negative electrode, which contains lithium foil 12μm copper foil substrate.

[0042] Preparation of the electrolytic solution: In a glove box, lithium salt LiFSI weighed 1.87g (trifluoromethyl sulfonyl imide lithium), which was dissolved in 13.6g of vinylene carbonate organic solvent, 11.18 g of ethylene glycol diglycidyl ether organic solvent, and 1.32g mixed solution of ethylene carbonate as a plasticizer was added magnet stirring until completely dissolved, to give an electrolyte.

[0043] Preparation of battery: In a glove box, the positive electrode sheet and negative electrode sheet are aligned separator disposed intermediate laminations laminated battery was prepared cut to the same size, the use of injected plastic film sealed after evacuation electrolytic solution, the lithium battery prepared.

Example Embodiment

[0044] Example 2

[0045] The method of Example 1 was prepared using the lithium battery embodiment, only except that: in step S1 solid initiator benzoyl peroxide BPO / sucrose.

Example Embodiment

[0046] Example 3

[0047] The method of Example 1 was prepared using the lithium battery embodiment, only except that: the electrolyte solution prepared in the step S2, the vinylene carbonate is replaced with the organic solvent by weight of propylene carbonate and the like organic solvents, ethylene glycol diglycidyl ether organic solvent is replaced with an equal weight of ethylene glycol dimethyl ether organic solvent.

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Description & Claims & Application Information

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Lithium battery and manufacturing method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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