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Lithium ion battery and charging method thereof

A lithium-ion battery and charging method technology, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as high cost, poor cycle performance, and low energy density, and achieve Effects of preventing lithium precipitation, reducing the usage of negative electrode, and improving energy density

Active Publication Date: 2022-01-28
SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention overcomes the problems of high cost, low energy density, and poor cycle performance of lithium-ion batteries in the prior art, and provides a charging method for lithium-ion batteries

Method used

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  • Lithium ion battery and charging method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Lithium iron phosphate is used as the positive electrode active material. The voltage range of the full battery is 2.5-3.65V. Through the test of the button battery, when the voltage range is 2.0-3.75V and the rate is 0.1C, the test capacity of the first delithiation gram is 160mAh / g, the first lithium intercalation gram capacity is 157mAh / g.

[0049] Graphite is used as the negative electrode material. Through the button battery test, when the voltage range is 0.005 ~ 2V and the rate is 0.1C, the first lithium intercalation gram capacity is 360mAh / g, and the first lithium delithiation gram capacity is 340mAh / g.

[0050] Based on the above positive and negative electrode materials, a lithium ion battery was designed with an N / P ratio of 0.9.

[0051] Calculate the negative reversible capacity of the above lithium-ion battery: negative reversible capacity = reversible gram capacity of the negative pole x surface density of the negative pole x length of the positive pole...

Embodiment 2

[0062] Nickel cobalt lithium manganese oxide is used as the positive electrode active material. The voltage range of the full battery is 2.8-4.3V. Through the test of the button battery, when the voltage range is 2.5-4.35V and the rate is 0.1C, the first delithiation gram capacity is tested. 218mAh / g, the first lithium intercalation capacity is 194mAh / g.

[0063] Graphite is used as the negative electrode material. Through the button battery test, when the voltage range is 0.005 ~ 2V and the rate is 0.1C, the first lithium intercalation capacity is 370mAh / g, and the first lithium delithiation capacity is 350mAh / g.

[0064] Based on the above positive and negative electrode materials, a lithium ion battery was designed with an N / P ratio of 0.95.

[0065] Calculate the positive electrode gram capacity: positive electrode gram capacity = negative electrode capacity ÷ n ÷ the mass of the positive active material, calculated to be 159.1Ah ÷ 1.06 ÷ 838.5 g = 179 mAh / g; use the butto...

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Abstract

The invention discloses a lithium ion battery and a charging method thereof. The charging method of the lithium ion battery is a charging voltage limiting method or a charging capacity limiting method, wherein the N / P ratio of the lithium ion battery is less than 1.02, and the N / P ratio is the ratio of the capacity of the negative pole piece per unit area to the capacity of the positive pole piece per unit area. According to the charging method of the lithium ion battery, the safety of the battery cell can be guaranteed, lithium separation in the charging process can be effectively prevented, the lithium ion battery is low in cost and high in energy density, and the cycle life is remarkably prolonged.

Description

technical field [0001] The invention relates to a lithium ion battery and a charging method thereof. Background technique [0002] Lithium-ion battery is a secondary battery that relies on lithium ions to move back and forth between the positive and negative electrodes. During charging, the lithium ions in the positive electrode come out, migrate to the negative electrode and embed in the negative electrode material; the opposite is true during discharge. , lithium ions are extracted from the negative electrode material, and then intercalated into the positive electrode material. Lithium-ion battery (LIB) is currently the battery system with the best comprehensive performance. It has unique advantages such as high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution. It has rapidly developed into a new battery system at this stage. The first-generation energy storage power supply is widely used in information technology, electric ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/44H01M10/0525Y02E60/10
Inventor 李送营李佳王宇帆
Owner SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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