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Gel polymer electrolyte power battery

A gel polymer, power battery technology, used in secondary batteries, circuits, electrical components, etc., can solve problems such as electrochemical performance and safety need to be further improved, achieve excellent safety performance, reduce losses, and suppress side effects. effect of reaction

Active Publication Date: 2017-05-10
南通市懋略科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical performance and safety of these materials still need to be further improved.

Method used

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  • Gel polymer electrolyte power battery
  • Gel polymer electrolyte power battery
  • Gel polymer electrolyte power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a gel polymer electrolyte power battery, including a negative electrode, a positive electrode, a gel polymer electrolyte and a diaphragm, the positive electrode includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, and the negative electrode includes a negative electrode The current collector and the negative electrode active material layer coated on the surface of the negative electrode current collector, the negative electrode active material layer includes graphite and silicon carbon materials dispersed in the gaps of graphite, the specific gravity of graphite is 50%, and the particle size of graphite is 0.5 μm-100 μm The silicon carbon material is a silicon material coated with a porous carbon layer, the thickness of the porous carbon layer is 5 μm-90 μm, the mass ratio of the porous carbon layer to the silicon carbon material is 30%, an...

Embodiment 2

[0052] The difference with embodiment 1 is:

[0053] The negative electrode active material layer includes graphite and silicon-carbon material dispersed in the gaps of graphite. The proportion of graphite is 60%. The mass ratio of the layer to the silicon-carbon material is 20%, and the porosity of the porous carbon layer is 60%.

[0054] The positive active material layer includes nickel-cobalt-manganese ternary material LiNi 0.6 co 0.2 mn 0.2 o 2 .

[0055]The gel polymer electrolyte includes liquid electrolyte, polymer monomer and initiator, and the mass ratio of liquid electrolyte, polymer monomer and initiator is 97.8:2:0.2, and the polymer monomer is tripropylene glycol Diacrylate (TPGDA), the initiator is azobisisobutyronitrile (AIBN).

[0056] The composition of the SEI-like film coating layer is: 70% amorphous carbon, 10% lithium carbonate, 10% alkyl lithium carbonate, 9.3% lithium fluoride and 0.7% binder styrene-butadiene rubber, SEI-like The thickness of th...

Embodiment 3

[0059] The difference with embodiment 1 is:

[0060] The negative electrode active material layer includes graphite and silicon-carbon material dispersed in the gaps of graphite, the proportion of graphite is 80%; the silicon-carbon material is a silicon material coated with a porous carbon layer, and the thickness of the porous carbon layer is 5 μm-90 μm. The mass ratio of the layer to the silicon-carbon material is 25%, and the porosity of the porous carbon layer is 30%.

[0061] The positive active material layer includes nickel-cobalt-aluminum ternary material LiNi 0.7 co 0.2 al 0.1 o 2 .

[0062] The gel polymer electrolyte includes liquid electrolyte, polymer monomer and initiator, and the mass ratio of liquid electrolyte, polymer monomer and initiator is 86.95:13:0.05, and the polymer monomer is tripropylene glycol Diacrylate (TPGDA), the initiator is benzoyl peroxide (BPO), the additive is 1% ethylene carbonate and 2% vinylene carbonate. The lithium salt is lithi...

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Abstract

The invention belongs to the technical field of a power battery, and particularly relates to a gel polymer electrolyte power battery. The gel polymer electrolyte power battery comprises a negative electrode, a positive electrode, a gel polymer electrolyte and a diaphragm, wherein a negative electrode active material layer comprises graphite and a composite material dispersed in gaps of the graphite; a positive electrode active material layer comprises at least one kind of NCA, NCM and a lithium-rich manganese material; the gel polymer electrolyte comprises a liquid electrolyte, a polymer monomer and an initiator; and the polymer monomer is selected from at least one kind of TPGDA and PETEA. Compared with the prior art, the gel polymer electrolyte power battery with high energy density, excellent electrochemical performance and high safety can be obtained through synergistic interaction based on reasonable and creative matching and interaction of the positive electrode material, the negative electrode material and the gel polymer electrolyte; and particularly, the gel polymer electrolyte can well protect the positive electrode material, thereby improving the electrochemical performance and the safety of the battery.

Description

technical field [0001] The invention belongs to the technical field of power batteries, in particular to a gel polymer electrolyte power battery with high energy density, excellent electrochemical performance and good safety. Background technique [0002] The urban climate is deteriorating and the smog pollution is serious, seriously endangering people's health. The development of new energy electric vehicles has become an inevitable choice to reduce urban pollution. The large-scale application of electric vehicles puts forward high requirements on the safety and energy density of lithium-ion power batteries. Lithium-ion batteries are widely used in various electronic products and electric vehicles due to their high energy density and long cycle life. However, at present, lithium-ion power batteries still use liquid electrolytes, which have strong thermal reactivity with the positive and negative electrodes, which can easily cause battery combustion and explosion; in additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 贺艳兵李喜林钱坤李懿洋罗丹游从辉李宝华杨全红康飞宇
Owner 南通市懋略科技有限公司
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