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Lithium supplementing method for lithium iron phosphate lithium ion battery and lithium iron phosphate lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, which is applied in the field of lithium iron phosphate lithium-ion battery and lithium iron phosphate lithium-ion battery, can solve problems such as fire, harsh environmental requirements, and the need for lithium-covering equipment to reduce costs No safety risk, make up for the effect of limited lithium supplementation at the positive electrode

Pending Publication Date: 2022-01-28
江苏海基新能源股份有限公司
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AI Technical Summary

Problems solved by technology

The advantage of this method is that the amount of lithium replenishment is sufficient, and its main disadvantage is that it requires special lithium covering equipment, has extremely strict environmental requirements, and has safety risks such as fire during production.

Method used

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  • Lithium supplementing method for lithium iron phosphate lithium ion battery and lithium iron phosphate lithium ion battery
  • Lithium supplementing method for lithium iron phosphate lithium ion battery and lithium iron phosphate lithium ion battery

Examples

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Embodiment

[0038] A method for replenishing lithium in a lithium iron phosphate lithium ion battery, comprising the following steps:

[0039] (1) Preparation of positive electrode sheet

[0040] The positive electrode active material lithium iron phosphate (LFP), lithium supplementary additive (PA), binder polyvinylidene fluoride (PVDF, ArkemaHSV900) and conductive agent acetylene black (AC) were dissolved in N- Stir uniformly in methylpyrrolidone (NMP) to obtain positive electrode slurry, which is coated on aluminum foil, and the positive electrode sheet is obtained after rolling, slitting, and die-cutting.

[0041] (2) Negative electrode sheet preparation

[0042] The negative electrode active material is graphite (C), the binder is hydroxypropyl cellulose lithium (HPMCLi) and lithium carboxylate modified styrene-butadiene rubber, and the conductive agent is acetylene black (AC). Stir uniformly in deionized water to obtain negative electrode slurry, and coat it on copper foil, and ob...

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Abstract

The invention relates to a lithium supplementing method for a lithium iron phosphate lithium ion battery and the lithium iron phosphate lithium ion battery. The lithium ion battery is formed by assembling a positive plate, a negative plate and a diaphragm, a positive material in the positive plate comprises lithium iron phosphate, a conductive agent, a binder and a lithium supplement additive lithium-rich manganese material xLi2MnO3.(1-x) LiTMO2, x is more than 0 and less than 1, TM is one or more of Ni, Co and Mn, and x is more than 0 and less than 1. A negative electrode material in the negative electrode plate comprises a negative electrode active substance, a conductive agent and a lithium-containing binder; and after the positive electrode plate, the negative electrode plate and the diaphragm are assembled into the battery, the battery is pre-charged and formed in a mode of combining step current and constant-voltage current limiting. According to the lithium supplementing method for the lithium iron phosphate lithium ion battery, lithium can be supplemented to the positive electrode and the negative electrode at the same time, the overall first effect and cycle performance of the battery are improved, no non-conductive residues are generated, no extra special equipment is needed, operation is easy, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium iron phosphate lithium ion battery replenishment method and a lithium iron phosphate lithium ion battery. Background technique [0002] Lithium iron phosphate batteries have become the leader in electrochemical energy storage due to their high safety, long life, and low cost. However, the cost per unit of electricity of the energy storage system is still maintained at a relatively high level, and the economic model income is not ideal, resulting in low investment enthusiasm in the industry, which is not good for the development of the industry. Improving the cycle life of battery cells and systems is the most direct and effective way to reduce the cost of electricity in the entire life cycle of an energy storage system. Therefore, it is of great significance to develop ultra-long cycle life lithium iron phosphate batteries. [0003] There are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/58H01M10/0525H01M10/058H01M10/42
CPCH01M4/5825H01M4/502H01M10/4235H01M10/0525H01M10/058H01M2004/028Y02E60/10Y02P70/50
Inventor 葛科王锡鑫余峰王增森蒋倩
Owner 江苏海基新能源股份有限公司
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