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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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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  • Lithium battery and manufacturing method thereof
  • Lithium battery and manufacturing method thereof
  • Lithium battery and manufacturing method thereof

Examples

Experimental program
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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 subst...

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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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.

Description

technical field [0001] The present disclosure relates to the field of lithium batteries, in particular, to a lithium battery and a manufacturing method thereof. Background technique [0002] In situ polymerization is one of the best ways to solve the interface problem and lithium dendrites in lithium batteries. In the prior art, in-situ polymerization is mostly carried out by coating a polymer electrolyte layer on the positive electrode and then adding a local super-concentrated electrolyte or simply using a local super-concentrated electrolyte. 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 mainly covered on the separator, and the polymer film on the electrode su...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/42
CPCH01M10/0565H01M10/058H01M10/052H01M10/4235Y02E60/10Y02P70/50
Inventor 吴荣方郭姿珠马永军
Owner BYD CO LTD
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