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Lithium titanate composite electrode plate and preparation method thereof, and lithium battery

A lithium titanate and pole piece technology, which is applied in the field of lithium ion battery preparation, to achieve the effects of improving efficiency, improving pass rate, and improving electrochemical performance

Inactive Publication Date: 2018-04-06
陈和平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial charge and discharge capacity, cycle and rate performance of the lithium silicate modified lithium titanate anode material still need to be further improved

Method used

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  • Lithium titanate composite electrode plate and preparation method thereof, and lithium battery
  • Lithium titanate composite electrode plate and preparation method thereof, and lithium battery
  • Lithium titanate composite electrode plate and preparation method thereof, and lithium battery

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Experimental program
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Effect test

Embodiment 1

[0038] The lithium titanate composite pole piece of this embodiment includes a current collector and an inner layer, an intermediate layer, and an outer layer arranged on the surface of the current collector; the inner layer is a lithium titanate layer; the middle layer is a lithium silicate layer; the outer layer is an organic Lithium layer; the thickness of the middle layer is 500nm; the thickness of the outer layer is 3 μm; the thickness of the inner layer is 50 μm; the lithium titanate layer is composed of lithium titanate, super carbon black, polyvinylidene fluoride, lithium titanate, super The mass ratio of carbon black and polyvinylidene fluoride is 92:2:6; the organic lithium layer is composed of ethyl lithium, SP conductive agent, binder polyvinylidene fluoride, and the ethyl lithium, SP, polyvinylidene fluoride The mass ratio of vinyl fluoride is 80:17:4.

[0039] The preparation method of the lithium titanate composite pole piece of the present embodiment comprises ...

Embodiment 2

[0045] The lithium titanate composite pole piece of this embodiment includes a current collector and an inner layer, an intermediate layer, and an outer layer arranged on the surface of the current collector; the inner layer is a lithium titanate layer; the middle layer is a lithium sulfate layer; the outer layer is an organic lithium layer; the thickness of the middle layer is 100nm; the thickness of the outer layer is 1 μm; the thickness of the inner layer is 100 μm; the lithium titanate layer is composed of lithium titanate, super carbon black, polyvinylidene fluoride, lithium titanate, super carbon The mass ratio of black and polyvinylidene fluoride is 90:3:7; the organic lithium layer is composed of propyllithium, SP conductive agent, polyvinylidene fluoride, and the mass ratio of propyllithium, SP, polyvinylidene fluoride The ratio is 60:29:3.

[0046] The preparation method of the lithium titanate composite pole piece of the present embodiment comprises the following st...

Embodiment 3

[0052] The lithium titanate composite pole piece of this embodiment includes a current collector and an inner layer, an intermediate layer, and an outer layer arranged on the surface of the current collector; the inner layer is a lithium titanate layer; the middle layer is a lithium sulfate layer; the outer layer is an organic lithium layer; the thickness of the middle layer is 500nm; the thickness of the outer layer is 5 μm; the thickness of the inner layer is 300 μm; the lithium titanate layer is composed of lithium titanate, super carbon black, polyvinylidene fluoride, lithium titanate, super carbon The mass ratio of black and polyvinylidene fluoride is 95:2:3; the organic lithium layer is made up of phenyllithium, graphene, polyvinylidene fluoride, and the mass ratio of said phenyllithium, graphene, polyvinylidene fluoride The ratio is 90:5:5.

[0053] The preparation method of the lithium titanate composite pole piece of the present embodiment comprises the following step...

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Abstract

The invention relates to a lithium titanate composite electrode plate and a preparation method thereof, and a lithium battery, and belongs to the technical field of preparation of the lithium ion battery. The lithium titanate composite electrode plate comprises a current collector, and an inner layer, a middle layer and an outer layer arranged on the surface of the current collector; the inner layer is a lithium titanate layer; the middle layer is a lithium silicate layer or a lithium sulfate layer; and the outer layer is an organic lithium layer. According to the lithium titanate composite electrode plate disclosed in the invention, based on the characteristic of high lithium ion conductivity of lithium silicate or lithium sulfate, and by virtue of a compact nanometer deposition layer, the electrode plate internal resistance can be lowered without influencing the energy density of the electrode plate; meanwhile, the lithium silicate layer or the lithium sulfate layer has the characteristic of high flexibility, so that the processing performance in the electrode plate rolling and winding processes can be improved, and the electrode plate percent of pass is further improved; and inaddition, the organic lithium layer is formed by the outer layer, so that the electrochemical performance of the electrode plate is further improved.

Description

technical field [0001] The invention relates to a lithium titanate composite pole piece, a preparation method thereof, and a lithium battery, belonging to the technical field of lithium ion battery preparation. Background technique [0002] Lithium-ion batteries are widely used in the fields of electric vehicles, energy storage and digital electronics due to their high energy density, good cycle performance, no memory effect and environmental friendliness. The key factor for whether ion batteries can be popularized and used. At present, lithium-ion batteries mainly include lithium iron phosphate batteries, ternary batteries, lithium manganese oxide batteries, lithium cobalt oxide batteries and lithium titanate batteries, and lithium titanate batteries have a long cycle life. (up to 20,000 times, service life ≥ 10 years), high safety performance and good rate performance are used for energy storage, hybrid vehicles and urban bus systems, but due to the changing environment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/485H01M4/58H01M10/0525H01M4/04
CPCH01M4/0404H01M4/485H01M4/5825H01M4/667H01M10/0525Y02E60/10
Inventor 陈和平徐军红
Owner 陈和平
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