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Lithium-ion battery and preparation method for same

A lithium-ion battery, liquid electrolyte technology, applied in the direction of electrolyte battery manufacturing, secondary battery, battery pack components, etc., can solve the problems affecting the electrochemical performance of the battery, electrolyte leakage, poor safety performance, etc. performance, reduce leakage, overcome the effect of electrolyte leakage

Active Publication Date: 2012-11-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problem of electrolyte leakage and poor safety performance in liquid lithium-ion batteries in the prior art, while gel-state lithium-ion batteries have unsaturated monomers and initiators that deteriorate the SEI film of the negative electrode and affect the electrochemical performance of the battery. technical problem

Method used

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  • Lithium-ion battery and preparation method for same

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preparation example Construction

[0028] Accordingly, the present invention provides a lithium ion battery and a preparation method thereof, which can better avoid the influence of monomers and initiators on the negative electrode SEI film, and have better safety performance. The lithium ion battery provided by the present invention includes: a casing, a pole core accommodated in the casing, the pole core includes a positive pole, a negative pole, and a diaphragm between the positive pole and the negative pole, and a liquid electrolyte is contained in the pole core. Gel is filled between the pole core and the shell.

[0029] The pole core structure of the lithium ion battery of the present invention can be similar to that of the existing liquid lithium ion battery, and the liquid electrolyte is accommodated in the diaphragm.

[0030] The gel contains or does not contain conductive lithium ions, preferably, the gel does not contain conductive lithium ions, so the gel is not used as a gel-state electrolyte, and it...

Embodiment 1

[0055] The separator and positive and negative electrode materials (LiCoO 2 Positive electrode / diaphragm / graphite negative electrode), wound into a battery pole core; paste tape on the bottom of the pole core and the winding end, reserve the first liquid injection port on the top of the pole core, and paste tape on the rest of the position; from the first Injection port containing LiPF 6 and the first solution of EC-EMC-DEC-VC organic solvent, wherein, LiPF 6 The concentration is 1mol / L, and the weight ratio of EC:EMC:DEC:VC is 4:3:2.5:0.5. After aging, precharge the battery; The position where the core is wrapped by the tape is injected with a second solution containing 9 wt% tetraethylene glycol dimethacrylate, 1 wt% dibenzoyl peroxide and 90 wt% EC-EMC-DEC-VC mixed solvent, Among them, the weight ratio of EC:EMC:DEC:VC is 4:3:2.5:0.5; heating at 80°C for 60min, heating triggers the polymerization of the second solution to form a gel, and the lithium ion battery A1 is obt...

Embodiment 2

[0065] The separator and positive and negative electrode materials (for example: LiCoO 2 Positive electrode / diaphragm / graphite negative electrode), wound into a battery pole core; paste transparent tape on the bottom of the pole core and the winding end, and after the first liquid injection port area is reserved on the top of the pole core, the rest of the position is pasted with transparent tape. Inject 1M containing LiPF from the first injection port 6 and the first solution of EC-EMC-VC, where LiPF 6 The concentration of the battery is 0.6mol / L, and the weight ratio of EC:EMC:VC is 3:6.5:0.5. After aging, the battery is precharged; Inject the second solution containing 20 wt% of methyl methacrylate monomer, 0.5 wt% of dibenzoyl peroxide and 79.5 wt% of EC and DMC mixed solvent at the position covered by the tape, where EC: the weight of DMC The ratio is = 1:1; heating at 60°C for 180 minutes, heating triggers the polymerization of the second solution to form a gel, and o...

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Abstract

The invention provides a lithium-ion battery, comprising a shell and a pole core contained in the shell, wherein the pole core comprises a positive pole, a negative pole, and a diaphragm located between the positive pole and the negative pole; and a liquid-state electrolyte is contained in the pole core, and a gel is filled between the pole core and the shell. The invention further provides a preparation method for the lithium-ion battery, comprising the following steps of: step 1, covering a rubberized fabric on the pole core, so as to form a sealed space in the pole core; and step 2, filling the liquid-state electrolyte in the sealed space of the pole core and performing pre-charge formation at first, and then filling second solution between the shell and the pore core, and heating to initiate a polymerization reaction, so as to form a gel between the pole core and the shell; or, filling second solution between the shell and the pore core, and heating to initiate a polymerization reaction, so as to form a gel between the pole core and the shell at first, and then filling the liquid-state electrolyte in the sealed space of the pole core and performing pre-charge formation. According to the invention, a problem of the leakage of the electrolyte is overcome, and the SEI (solid electrolyte interface) film of the negative pole cannot be influenced.

Description

technical field [0001] The invention relates to the technical field of batteries, and more specifically, to a lithium ion battery and a preparation method thereof. Background technique [0002] As a high-energy chemical power source, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. . According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries can be divided into two categories: liquid lithium ion battery (LIB for short) and polymer lithium ion battery (PLIB for short). The positive and negative electrode materials used in polymer lithium-ion batteries are the same as those in liquid lithium ions, and the working principles of the batteries are basically the same. Their main difference lies in the different electrolytes. Traditional lithium-ion batteries use liquid electrolytes, which have safety problems such as liquid electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M2/36H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 玉正日钟滢龚娅梁世硕
Owner BYD CO LTD
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