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Method for preparing titanium iron lithium battery

A technology of lithium battery and ferro-titanium, which is applied in the field of preparation of titanium-iron-lithium battery, can solve problems such as unfavorable structural stability, impact on discharge capacity, particle pulverization failure, etc., to improve safety and reliability, increase mass specific energy, and prolong cycle The effect of longevity

Active Publication Date: 2019-05-03
YINLONG ENERGY CO LTD
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Problems solved by technology

[0003] The negative electrodes of existing lithium iron phosphate batteries generally use pure graphite materials. The hexagonal layered structure of graphite materials is not conducive to maintaining the structural stability during charging and discharging; graphite is a combustible substance, which is not conducive to the control of the battery in thermal runaway Stability; at the same time, the expansion and contraction of graphite during charging and discharging lead to the failure of particle pulverization, and the cycle life of the battery made by it is relatively low, which cannot meet the needs of improving the energy density of the battery; in addition, the layered structure of graphite leads to The migration distance of medium ions is long, which makes it impossible to achieve high-rate charging, and the discharge capacity under low temperature conditions is also affected.

Method used

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  • Method for preparing titanium iron lithium battery

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preparation example Construction

[0034] An embodiment of the present invention provides a method for preparing a titanium-iron-lithium battery, the flow chart of which is as follows figure 1 As shown, the method is implemented through the following steps:

[0035] Step 1: adding the thickener, the first conductive agent, the second conductive agent, the binder and the titanium-silicon-carbon active material into the solvent in sequence, and mixing evenly to obtain the titanium-silicon-carbon negative electrode slurry;

[0036] Wherein, the composition of the titanium-silicon-carbon negative electrode slurry in the step 1 is as follows in parts by weight: titanium-silicon-carbon active material: 86.0-99.0 parts, thickener: 1.0-5.0 parts, first conductive agent: 0.2-6.0 parts, Second conductive agent: 0.5-5.0 parts, binder: 0.2-5.0 parts.

[0037] Step 1 is specifically realized through the following steps: wherein, the ambient humidity during the whole preparation process is 1-20% RH, and the ambient temperat...

Embodiment 1

[0069] Step 1: The composition of the titanium-silicon-carbon negative electrode slurry is as follows in parts by weight: titanium-silicon-carbon active material: 92.0 parts, polytetrafluoroethylene: 3.0 parts, carbon nanotubes: 3.0 parts, graphene: 2.8 parts, epoxy resin: 2.6 parts; polytetrafluoroethylene, carbon nanotubes, graphene, epoxy resin and titanium-silicon-carbon active material are added to the solvent in sequence, and mixed uniformly to obtain titanium-silicon-carbon negative electrode slurry; wherein, the titanium-silicon-carbon active material by D 10 Titanium silicon carbon powder, D 50 Titanium silicon carbon powder and D 90 TiSiC powder composition, the D 10 The particle size of the titanium silicon carbon powder is 0.8-3.0 μm, the D 50 The particle size of the titanium silicon carbon powder is 4.0-18.0 μm, the D 90 The particle size of the titanium silicon carbon powder is less than 25.0 μm; wherein, the solvent is deionized water and N-methylpyrrolidon...

Embodiment 2

[0088] Step 1: The composition of the titanium-silicon-carbon negative electrode slurry is as follows in parts by weight: titanium-silicon-carbon active material: 86.0 parts, polytetrafluoroethylene: 3.0 parts, carbon nanotubes: 6.0 parts, graphene: 2.8 parts, epoxy resin: 2.6 parts; polytetrafluoroethylene, carbon nanotubes, graphene, epoxy resin and titanium-silicon-carbon active material are added to the solvent in sequence, and mixed uniformly to obtain titanium-silicon-carbon negative electrode slurry; wherein, the titanium-silicon-carbon active material by D 10 Titanium silicon carbon powder, D 50 Titanium silicon carbon powder and D 90 TiSiC powder composition, the D 10 The particle size of the titanium silicon carbon powder is 0.8-3.0 μm, the D 50 The particle size of the titanium silicon carbon powder is 4.0-18.0 μm, the D 90 The particle size of the titanium silicon carbon powder is less than 25.0 μm; wherein, the solvent is deionized water and N-methylpyrrolidon...

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Abstract

The invention discloses a method for preparing a titanium iron lithium battery. The method comprises preparing a titanium silicon carbon negative electrode paste and lithium iron phosphate positive electrode paste; then uniformly applying the lithium iron phosphate positive electrode paste and the titanium silicon carbon negative electrode paste to a positive electrode current collector and a negative electrode current collector respectively; obtaining positive and negative electrode sheets by drying and pressing; and finally obtaining the titanium iron lithium battery by assembly. The titanium silicon carbon is used as a negative electrode material. The shell, the core and the pomegranate sheath in a titanium silicon carbon shell-core pomegranate structure can be used for ensuring that atitanium silicon carbon anode material is more stable and reliable than the conventional graphite in a charge and discharge process, thereby further improving the safety and reliability of the battery, extending the cycle life of the battery, and improving the quality and specific energy of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion preparation, and in particular relates to a preparation method of a titanium iron lithium battery. Background technique [0002] With the development of technology, lithium-ion batteries also have very good application prospects in the fields of electric vehicles and energy storage, which will have a profound impact on people's lives in the future. [0003] The negative electrodes of existing lithium iron phosphate batteries generally use pure graphite materials. The hexagonal layered structure of graphite materials is not conducive to maintaining the structural stability during charging and discharging; graphite is a combustible substance, which is not conducive to the control of the battery in thermal runaway Stability; at the same time, the expansion and contraction of graphite during charging and discharging lead to the failure of particle pulverization, and the cycle life of the battery m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/04H01M4/1393H01M4/1397H01M4/36H01M4/587H01M4/38
CPCY02E60/10Y02P70/50
Inventor 吴彬杰李海军蔡惠群魏银仓
Owner YINLONG ENERGY CO LTD
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