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Lithium ion secondary cell and method for preparing anode thereof

A secondary battery and lithium ion technology, which is applied in the direction of secondary battery, electrode manufacturing, battery electrodes, etc., can solve the problems of limited improvement range and low overall battery performance, and achieve long cycle life, excellent high current performance, and production low cost effect

Inactive Publication Date: 2007-08-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, affected by the oxidation potential of the material itself, the median voltage of the lithium-nickel-cobalt-oxygen metal composite oxide during the discharge process is around 3.6V, which is lower than the 3.8V of the lithium-cobalt oxide, resulting in a specific energy of only 600mWh / g. Compared with the specific energy of lithium cobalt oxide 550mWh / g, the improvement range is limited, and the improvement of the overall performance of the battery is not significant.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] (1) Preparation of high-cobalt nickel hydroxide: The high-cobalt nickel hydroxide is prepared by adding ammonia to a uniformly mixed solution of cobalt sulfate and nickel sulfate, and its structure is expressed as Ni 1-b Co b (OH) 2 ;

[0026] (2) Preparation of lithium nickel cobalt metal composite oxide:

[0027] a. Take the lithium compound and the above Ni 1-b Co b (OH) 2 , The M compound is uniformly mixed by ball milling at the ratio of Li / (Ni+Co+M) between 1.01 and 1.10, and calcined for 1 to 10 hours at a temperature between 600°C and 720°C in an oxygen atmosphere;

[0028]b. The product of step a is calcined under an oxygen atmosphere at a temperature between 750°C and 900°C for 8-20 hours;

[0029] c. The product obtained in step b is quenched, ball milled, and sieved to obtain the chemical formula as Li a Ni 1-b-c Co b McO 2 Of lithium nickel cobalt metal composite oxide.

[0030] (3) The product of step c of step (2) lithium nickel cobalt metal composite oxide L...

Embodiment 1

[0040] The high-cobalt spherical nickel Ni with a particle size of 8-10μm 0.81 Co 0.19 (OH) 2 After mixing with 0.52 molar equivalent of lithium carbonate by ball milling, the mixture was calcined at 650°C in an oxygen atmosphere for 6 hours, and then at 800°C for 16 hours to obtain a structure of LiNi 0.81 Co 0.19 O 2 Of lithium nickel cobalt oxygen composite metal oxide A, control its average particle size D 50 10~12μm, I 003 / I 104 The value is 1.37.

[0041] Combine the above A with the average particle size D 50 Lithium cobalt oxide B with a thickness of 6-8 μm is mixed at a weight ratio of 80:20 as a positive electrode active material. Use PVDF as the binder (2% dosage), acetylene black as the conductive agent (3% dosage), NMP as the solvent, stirring (speed control is 300~6000rpm, time control is 0.2~10 hours), mix evenly, apply, Drying (all the three processes need to be carried out in a vacuum environment) and pressing, so as to prepare the battery positive sheet on the a...

Embodiment 2

[0044] In this embodiment, the mixing ratio of lithium nickel cobalt oxide composite metal oxide A and lithium cobalt oxide B is 75:25. Except for this, the other processes are the same as in Example 1.

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Abstract

Disclosed lithium ion secondary battery including anode, cathode, electrolyte and diaphragm provides features of high discharge capacity, high discharge energy, long cycle life and excellent current performance. The active material of positive pole includes composite metal oxide of lithium-nickel-cobalt and oxide of lithium-cobalt LiCoO2 mixed each other in certain ratio. The method for preparing positive pole includes steps: baking spherical nickel hydroxide containing high cobalt and compound containing lithium obtains component A; mixing component A and LiCoO2 and adding adhesive, current conducting agent, and solvent; though procedures of string, coating, drying and sheet formatting so as to obtain positive pole. Features are simple and easy of industrialization.

Description

【Technical Field】 [0001] The invention relates to a lithium ion secondary battery and a preparation method thereof, in particular to a positive electrode material of the battery and a preparation method thereof. 【Background technique】 [0002] With the rapid development of the electronics industry and the information industry, people have higher and higher requirements for the power supply of various electrical products. Among them, lithium-ion secondary batteries are widely used due to their many superior properties. While the lithium ion secondary battery is widely used, people’s requirements for its various performances have also increased. In particular, the lithium ion secondary battery is required to have high comprehensive performance, namely: high discharge capacity, high discharge energy, Long cycle life, excellent high current performance. [0003] Cathode materials are a key part of lithium-ion secondary batteries and are closely related to the performance of the batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/48H01M4/58H01M4/04H01M4/02H01M4/52
CPCY02E60/122H01M4/525C01G53/42C01P2006/40C01P2002/74C01P2002/52H01M2004/021C01P2004/51H01M4/1391C01P2004/61Y02E60/10Y02P70/50
Inventor 王传福姜占锋董俊卿
Owner BYD CO LTD
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