Lithium ion battery and its preparation method

A lithium-ion battery and battery technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of unsatisfactory battery safety performance, reduced battery quality and capacity, etc., and achieves improved production efficiency, small thickness, simplified roll The effect of the winding process

Active Publication Date: 2014-05-14
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the technical problem that the safety performance of the existing battery is still unsatisfactor

Method used

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  • Lithium ion battery and its preparation method

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preparation example Construction

[0019] The present invention also provides a preparation method for the above-mentioned battery, the steps include: S1, preparation of the electrode group: the electrode group is prepared by winding or stacking the negative electrode / inorganic separator / positive electrode, and the inorganic separator is attached to the surface of the positive electrode and / or the negative electrode On the surface, the inorganic diaphragm includes lithium manganese phosphate and a binder, and the content of the binder is 1-15 parts by weight relative to 100 parts by weight of lithium manganese phosphate; the porosity of the inorganic diaphragm is 30-80 %. The aforementioned lithium manganese phosphate and binder are commercially available. The method for forming the electrode group by winding or stacking has no special requirements in the present invention, and can be carried out with reference to the prior art, and will not be repeated here.

[0020] The inorganic separator between the positi...

Embodiment 1

[0042] (1) Preparation of positive electrode sheet

[0043] Weigh lithium iron phosphate (LiFePO 4 ), acetylene black, polyvinylidene fluoride (PVDF), N-methylpyrrolidone (NMP) according to the weight ratio of LiFePO 4 : Acetylene black:PVDF:NMP=85:10:5:50 Prepare the positive electrode slurry, stir it evenly, coat it on a 12μm thick aluminum foil, then dry it at 120℃ for 5h, then press it with a tablet machine, and finally slice it , to obtain a lithium-ion battery positive electrode with length×width×thickness=551mm×44mm×130 μm.

[0044] (2) Preparation of inorganic separator

[0045] Stir and dissolve 0.5g of polyvinylidene fluoride in 5g of N-methylpyrrolidone, add 8.6g of lithium manganese phosphate powder with a particle size of 50nm, and stir with an electric stirrer (at a speed of 1000rpm) for 20min to obtain an inorganic slurry with a solid content of Controlled at 61wt%. A coating machine was used to coat the surface of the positive electrode sheet with a coating...

Embodiment 2

[0052] The battery sample S2 was prepared by the same method as in Example 1, except that the coating thickness of the inorganic slurry was 5 μm.

[0053] The same method as in Example 1 was used to measure the porosity of the inorganic separator to be 52%, and the liquid absorption rate to be 56%.

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Abstract

The invention provides a lithium ion battery and its preparation method. The lithium ion battery comprises a housing, an electrode group and an electrolyte, and the electrode group and the electrolyte are sealed in the housing, the electrode group comprises a positive electrode, a negative electrode and an inorganic membrane arranged between the positive electrode and the negative electrode, the inorganic membrane includes lithium manganese phosphate and a binder, in relative to 100 parts by weight of the lithium manganese phosphate, the content of the binder is 1-15 parts by weight; and the inorganic membrane porosity is 30-80%. The prepared lithium ion battery has the advantage of inorganic membrane safety performance, the charge and discharge capacity of the battery is higher, and the cycling performance is better.

Description

technical field [0001] The invention relates to the field of batteries, in particular, the invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries, which have the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. Widely used in electric tools, electric vehicles and other fields, there are important requirements for its safety performance. [0003] Lithium-ion batteries generally include a casing and an electrode group and an electrolyte sealed in the casing, wherein the electrode group includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, wherein the separator has a function to generate electrical insulation between the two electrodes. , and to maintain the role of the electrolyte, the separators of existing commercia...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/16H01M10/058H01M50/431
CPCH01M4/5825H01M10/0525H01M10/058H01M50/431Y02E60/10Y02P70/50
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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