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System formula of lithium iron phosphate power battery pole piece difficult-to-permeate liquid and experimental method of lithium iron phosphate power battery pole piece difficult-to-permeate liquid

A power battery, lithium iron phosphate technology, applied in battery electrodes, circuits, flow characteristics and other directions, can solve the problems of difficult preparation, poor compatibility, expensive auxiliary modified materials, etc., to achieve good system compatibility, improve wettability, Improve the effect

Pending Publication Date: 2022-07-01
广西燚能新能源有限公司
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Problems solved by technology

However, auxiliary modified materials may be expensive and difficult to prepare, and if they are directly added to the mature positive / negative electrode material system, the compatibility is poor

Method used

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  • System formula of lithium iron phosphate power battery pole piece difficult-to-permeate liquid and experimental method of lithium iron phosphate power battery pole piece difficult-to-permeate liquid
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  • System formula of lithium iron phosphate power battery pole piece difficult-to-permeate liquid and experimental method of lithium iron phosphate power battery pole piece difficult-to-permeate liquid

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Embodiment Construction

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. It is to be understood, however, that many of the details set forth in the specification are merely provided to provide the reader with a thorough understanding of one or more aspects of the invention, which aspects of the invention may be practiced without these specific details.

[0029] like Figure 1-6 As shown in the figure, a system formulation of a lithium iron phosphate power battery pole piece impermeable to liquid includes a lithium salt, a solvent system and an auxiliary agent;

[0030] Lithium salt adds 151.92g (ie 151.92g / L) of LiPF per liter of solvent system 6 , the solvent system is The adjuvants are 0.50-1.50% LiBOB, 0.50-1.5% VC and 0.01-0.05% TOP.

[0031] The infiltration of the battery pole piece by the electroly...

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Abstract

The invention provides a system formula of a lithium iron phosphate power battery pole piece infiltrating solution and an experimental method, and belongs to the technical field of lithium batteries, and the method comprises the following steps: respectively adding LiPF6 into a solvent system with a fixed ratio according to a series of mass ratios at a uniform speed, mixing to prepare LiPF6 mixed solutions with different contents, then measuring the viscosity, the conductivity and the wetting angle, and determining the optimal LiPF6 content; respectively adding LiPF6 into the organic solvent systems with different proportions according to a series of mass ratios at a uniform speed, mixing, controlling the LiPF6 in each mixed solution to be the determined optimal content, measuring the viscosity, the conductivity and the wetting angle, and determining the optimal solvent system proportion; and mixing the determined mixed solution with adjuvants in different proportions, then measuring the viscosity, the conductivity and the wetting angle, and determining the optimal electrolyte system formula. The electrolyte formula system provided by the invention has the advantages of good system compatibility and remarkable improvement effect, and has universality for battery pole pieces of different material systems. In addition, compared with a visual inspection method, a weighing method and other common methods for characterizing the wettability of the electrolyte, the method for measuring the wettability angle by adopting the xenolithlus bubble method has the advantages of simplicity and accuracy.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a system formulation and an experimental method for the impermeable liquid-permeable pole piece of a lithium iron phosphate power battery. Background technique [0002] Lithium iron phosphate batteries still occupy the dominant position of power lithium-ion batteries due to their long life and high safety, especially in the field of energy storage. However, the tap density of the lithium iron phosphate cathode material is small and the capacity space is limited. To further improve the energy density of the lithium iron phosphate power battery, it is one of the more direct solutions to improve the compaction density of the positive / negative pole pieces. However, in order to rapidly increase the capacity of lithium iron phosphate power batteries, some manufacturers blindly increase the compaction density of the positive and negative pole pieces. The microscopic impact is ...

Claims

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Application Information

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IPC IPC(8): H01M4/58G01N11/00G01N27/06
CPCH01M4/5825G01N11/00G01N27/06
Inventor 李兆成江利金黄健华覃佳琳刘国壮朱燕飞
Owner 广西燚能新能源有限公司
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