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Polymer lithium ion battery with high energy density and fast charge and preparation method thereof

A lithium-ion battery, high energy density technology, applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of short standby time and use time of electronic products, affecting consumer experience, ordinary battery energy density, etc. , to achieve the effect of good cycle performance, good cycle performance and good cycle life

Inactive Publication Date: 2021-06-18
CHONGQING ZIJIAN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the ever-changing electronic products, the energy density requirements for polymer lithium-ion batteries are also getting higher and higher. The energy density of batteries is ordinary, resulting in low battery capacity, resulting in shorter standby time and use time of electronic products, which greatly affects consumers. experience
At the same time, batteries with high energy density often do not have the function of fast charging, and the charging time often takes 2 hours

Method used

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  • Polymer lithium ion battery with high energy density and fast charge and preparation method thereof
  • Polymer lithium ion battery with high energy density and fast charge and preparation method thereof
  • Polymer lithium ion battery with high energy density and fast charge and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A polymer lithium-ion battery with high energy density and fast charge, including positive electrode sheet, negative electrode sheet, porous separator and organic electrolyte;

[0036] The positive electrode sheet includes lithium cobalt oxide, and the lithium cobalt oxide is doped with two elements of aluminum and titanium. The D50 of lithium cobalt oxide in the positive electrode sheet is 16-18 μm, and the specific surface area is: 0.1-0.3 m 2 / g, the mass percentage composition of aluminum element in lithium cobaltate is 0.9%, the mass percentage composition of titanium element is 0.09%;

[0037] The negative electrode sheet mainly includes artificial graphite and silicon-based materials, wherein the graphite material has a gram capacity of 350-360 mAh / g, a material particle size D50 of 13-15 μm, and a specific surface area of ​​0.7-3 m 2 / g, the surface of the graphite material is coated with soft carbon, and the coating amount is 0.2-0.3% of the graphite weight; th...

Embodiment 2

[0052] A polymer lithium-ion battery with high energy density and fast charge, including positive electrode sheet, negative electrode sheet, porous separator and organic electrolyte;

[0053] The positive electrode sheet includes lithium cobalt oxide, and the lithium cobalt oxide is doped with two elements of aluminum and titanium. The D50 of the lithium cobalt oxide of the positive electrode sheet is 12-14 μm, and the specific surface area is: 0.1-0.3 m 2 / g, the mass percentage composition of aluminum element in lithium cobaltate is 0.3%, the mass percentage composition of titanium element is 0.03%;

[0054] The negative electrode sheet mainly includes artificial graphite and silicon-based materials, wherein the graphite material has a gram capacity of 350-360 mAh / g, a material particle size D50 of 10-13 μm, and a specific surface area of ​​0.7-3 m 2 / g, the surface of the graphite material is coated with soft carbon, and the coating amount is 0.03-0.1% of the graphite weigh...

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Abstract

The invention discloses a polymer lithium ion battery with high energy density and fast charge and a preparation method thereof, the battery comprises a positive plate, a negative plate, a porous isolation membrane and an organic electrolyte, the positive plate comprises lithium cobalt oxide, and the lithium cobalt oxide is doped with two elements of aluminum and titanium; the negative plate comprises artificial graphite and a silicon-based material, and the artificial graphite is coated with soft carbon; the porous isolating membrane is a polyethylene membrane subjected to double-sided coating treatment; and the electrolyte comprises a lithium salt, carbonic ester, carboxylic ester and an additive. The working voltage range of the polymer lithium ion battery is 4.48-2.75 V, the polymer lithium ion battery has a 2C rapid charging function, the volume energy density is greater than or equal to 635 Wh / L, and the battery capacity is greater than or equal to 80% within 30 minutes of 2C charging. The cycle life of the battery is long, the capacity retention ratio is over 80% after 500 cycles of charging and discharging at the normal temperature of 2C / 1C, and meanwhile, the high-temperature and low-temperature performance is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a polymer lithium-ion battery with high energy density and fast charging and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of automobiles, energy storage, and electronic products due to their environmental friendliness, high energy density, and good cycle performance. The energy density of polymer lithium-ion batteries is higher than that of liquid lithium-ion batteries, and the battery shape can be customized according to needs, which is especially popular in the field of electronic products. With the ever-changing electronic products, the energy density requirements for polymer lithium-ion batteries are also getting higher and higher. The energy density of batteries is ordinary, resulting in low battery capacity, resulting in shorter standby time and use time of electronic products, which greatly af...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13H01M4/139H01M4/36H01M4/525H01M4/587H01M10/0567H01M10/0587
CPCH01M4/364H01M4/525H01M4/587H01M4/13H01M4/139H01M10/0587H01M10/0525H01M10/0567H01M2004/028H01M2004/027Y02P70/50Y02E60/10
Inventor 田荣波黄圣华张钶郑章倩陈启多程君
Owner CHONGQING ZIJIAN NEW ENERGY CO LTD
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