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Formation method for lithium ion battery and lithium ion battery

A lithium-ion battery and a formation method technology, applied in the field of formation of lithium-ion batteries, can solve the problems of unsuitable formation methods of lithium-ion batteries, unsatisfactory electrochemical performance of lithium-ion batteries, etc. The effect of excellent performance and excellent cycle performance

Inactive Publication Date: 2015-05-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the existing lithium-ion battery formation method is not suitable for lithium-ion secondary batteries made of mixed positive electrode active materials, the electrochemical performance of the lithium-ion battery after formation is not ideal

Method used

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  • Formation method for lithium ion battery and lithium ion battery
  • Formation method for lithium ion battery and lithium ion battery
  • Formation method for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This embodiment 1 contains two kinds of cathode materials, LiMn 2 o 4 and LiFePO 4 Mix and make positive electrode material, the design charge capacity of positive electrode material is 800mAh, of which LiMn 2 o 4 400 mAh, LiFePO 4 It is 400mAh; Natural graphite is negative pole, and diaphragm material is polyethylene film, adopts the chemical conversion method of the present invention to carry out chemical conversion, specifically comprises the following steps:

[0059] 1. Production of battery:

[0060] A. Production of positive electrode sheet: Calculate the positive electrode active material LiMn according to the design capacity 2 o 4 and LiFePO 4 The amount of the positive electrode material is as follows: 93wt% positive electrode active material, 2wt% conductive agent, 3wt% PVDF, and then use NMP as a solvent to make a slurry and coat it on Al foil. After drying, Positive electrode sheets are made by rolling and other processes;

[0061] B, the making o...

Embodiment 2

[0069] This Example 2 contains two kinds of cathode materials, LiCoO 2 and LiFePO 4 Mix and make positive electrode material, the design charging capacity of positive electrode material is 800mAh, of which LiCoO 2 400 mAh, LiFePO 4 It is 400mAh; Natural graphite is negative electrode, and diaphragm material is polypropylene film, adopts the chemical formation method of the present invention to carry out chemical formation, specifically comprises the following steps:

[0070] 1. Production of battery:

[0071] A. Production of positive electrode sheet: Calculate the positive electrode active material LiCoO according to the design capacity 2 and LiFePO 4 The amount of the positive electrode material is as follows: 90wt% positive electrode active material, 5wt% conductive agent, 5wt% PVDF, and then use NMP as a solvent to make a slurry and coat it on the Al foil. After drying, Positive electrode sheets are made by rolling and other processes;

[0072] B, the making of neg...

Embodiment 3

[0080] This embodiment 3 contains two kinds of cathode materials, LiNiO 2 and LiFePO 4 Mix and make positive electrode material, the design charge capacity of positive electrode material is 800mAh, among which LiNiO 2 600 mAh, LiFePO 4 It is 200mAh; Natural graphite is negative electrode, and diaphragm material is polyethylene film, adopts the chemical formation method of the present invention to carry out chemical formation, specifically comprises the following steps:

[0081] 1. Production of battery:

[0082] A. Production of positive electrode sheet: Calculate the positive electrode active material LiNiO according to the design capacity 2 and LiFePO 4 The amount of the positive electrode material is as follows: 95wt% positive electrode active material, 1wt% conductive agent, 4wt% PVDF, and then use NMP as a solvent to make a slurry and coat it on the Al foil. After drying, Positive electrode sheets are made by rolling and other processes;

[0083] B, the making of ...

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Abstract

The invention discloses a formation method for a lithium ion battery, which comprises the following steps of: 1, providing a lithium ion battery, wherein the lithium ion battery contains n anode materials, n is not less than 2, the charging capacity of the first anode material is set as C1,...the charging capacity of the n(th) anode material is set as Cn, and the platform voltage Vn of the n(th) anode material is greater than the platform voltage Vn-1 of the n-1(th) anode material; and 2, performing constant-current time-limiting charging on the lithium ion battery by a current I1, performing constant-current voltage-limiting charging on the lithium ion battery by a current I1' and with a cut-off voltage V1', ...performing constant-current voltage-limiting charging on the lithium ion battery by a current In, and performing constant-current voltage-limiting charging on the lithium ion battery by a current In' and with a cut-off voltage Vn'. According to the formation method for the lithium ion battery disclosed by the invention, the formation current and time are set according to the respective platforms and nominal capacities of the mixed anode materials, so that the mixed anode materials can be adequately activated, and the capacity, cycle performance and thickness can be improved.

Description

technical field [0001] The invention relates to a method for forming a lithium ion battery, more specifically, to a method for forming a lithium ion battery containing mixed positive electrode materials. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, wide operating temperature range, wide operating voltage range, low self-discharge rate, high efficiency and high specific energy, and no memory effect. They have been widely used in many industries such as electronics and automobiles. . [0003] The formation step of lithium-ion batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Formation is the process of charging a battery for the first time. There are mainly two ways of formation of the existing lithium-ion secondary batteries, sealed formation and open formation. Sealing formation is to seal the liquid injection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 牟晓文贾强仟魏岩巍鲁首明
Owner BYD CO LTD