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Ternary compound lithium-ion power battery

A power battery and ternary composite technology, which is applied in the direction of batteries, secondary batteries, battery electrodes, etc., can solve the problems of poor cycle stability of power batteries and cannot meet the needs of power batteries, achieve excellent rate and cycle performance, and solve the problem of discharge capacity Low, the effect of improving safety performance

Inactive Publication Date: 2018-02-16
宁波维科新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle stability of conventional ternary composite system power batteries is poor, which cannot meet the increasingly demanding needs of power batteries

Method used

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  • Ternary compound lithium-ion power battery
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  • Ternary compound lithium-ion power battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033]A ternary composite lithium-ion power battery, including a positive electrode, a negative electrode, a diaphragm, an electrolyte and a casing, the positive electrode is a mixture of positive electrode active material, positive electrode conductive agent and positive electrode binder uniformly coated on the current collector Made on both sides, the negative electrode is made by uniformly coating the mixture of artificial graphite, negative electrode conductive agent and negative electrode binder on both sides of the current collector. In this embodiment, the positive electrode active material is nickel cobalt lithium manganese oxide material (NCM ) and lithium manganese oxide according to the mass percentage of 60% and 40%, the D50 of the secondary particle of nickel cobalt lithium manganese oxide material (NCM) is 9.5-13.5μm, and the specific surface area is 0.15-0.55m 2 / g, the D50 of lithium manganate is 10-15μm, and the specific surface area is 0.3-0.5m 2 / g. The pos...

Embodiment 2

[0039] A ternary composite lithium-ion power battery, including a positive electrode, a negative electrode, a diaphragm, an electrolyte and a casing, the positive electrode is a mixture of positive electrode active material, positive electrode conductive agent and positive electrode binder uniformly coated on the current collector Made on both sides, the negative electrode is made by uniformly coating the mixture of artificial graphite, negative electrode conductive agent and negative electrode binder on both sides of the current collector. In this embodiment, the positive electrode active material is nickel cobalt lithium manganese oxide material (NCM ) and lithium manganese oxide according to the mass percentage of 55% and 45%, the D50 of the secondary particle of nickel cobalt lithium manganate material (NCM) is 9.5-13.5μm, and the specific surface area is 0.15-0.55m 2 / g, the D50 of lithium manganate is 10-15μm, and the specific surface area is 0.3-0.5m 2 / g. The positive...

Embodiment 3

[0045] A ternary composite lithium-ion power battery, including a positive electrode, a negative electrode, a diaphragm, an electrolyte and a casing, the positive electrode is a mixture of positive electrode active material, positive electrode conductive agent and positive electrode binder uniformly coated on the current collector Made on both sides, the negative electrode is made by uniformly coating the mixture of artificial graphite, negative electrode conductive agent and negative electrode binder on both sides of the current collector. In this embodiment, the positive electrode active material is nickel cobalt lithium manganese oxide material (NCM ) and lithium manganese oxide according to the mass percentage of 65% and 35%, the D50 of the secondary particle of nickel cobalt lithium manganese oxide material (NCM) is 9.5-13.5μm, and the specific surface area is 0.15-0.55m 2 / g, the D50 of lithium manganate is 10-15μm, and the specific surface area is 0.3-0.5m 2 / g. The po...

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Abstract

The invention belongs to the technical field of lithium-ion batteries and particularly relates to a ternary compound lithium-ion power battery containing a multi-component conductive agent. The ternary compound lithium-ion power battery comprises a positive electrode, a negative electrode, a separator, an electrolyte and a shell, wherein the positive electrode and the negative electrode are prepared by evenly coating two sides of a current collector with a mixture prepared from a positive active material or a negative active material, a conductive agent and a binder separately; and the positive active material is a compound of 50-70% of a ternary material and 30-50% of lithium manganate. According to the lithium-ion battery, the capacity of a single battery is 20-30Ah, the energy density is 190-200Wh / kg, the rate discharge capacity percentages of the battery under discharge current of 1C, 2C and 3C can reach 98.1%, 97.40% and 96.30% in comparison with that under the discharge current of 0.5C separately, the discharge capacity percentage at low temperature of -20 DEG C can reach 76.8% and the retention rate after 200 charge and discharge cycles under 1C reaches 98%.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a ternary composite lithium ion power battery containing a multi-component conductive agent. Background technique [0002] With the gradual popularization of new energy vehicles and the continuous development of power lithium-ion battery technology, the application fields and regions of new energy vehicles continue to expand, and the requirements for power lithium-ion batteries are also getting higher and higher. The domestic emphasis on nature and the living environment has brought unprecedented opportunities for the popularization of new energy vehicles, but at the same time, the vast land and diverse climates have made the requirements for new energy vehicles extremely stringent. Therefore, automobile manufacturers also put forward stricter requirements on the low-temperature performance and high-rate charge-discharge performance of batteries under different work...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/058B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/505H01M4/525H01M4/625H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 吴子文渠立刚颜雪冬王彬文胡丽娜姜影影
Owner 宁波维科新能源科技有限公司
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