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Lithium ion secondary cell and method for preparing anode thereof

A secondary battery, lithium ion technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of limited improvement and low overall battery performance, and achieve long cycle life, excellent high current performance, and discharge. High volume effect

Inactive Publication Date: 2005-02-16
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

[0026] (1) Preparation of high-cobalt nickel hydroxide: adopt to add ammoniacal liquor to the uniformly mixed cobalt sulfate and nickel sulfate solution to prepare high-cobalt nickel hydroxide, and its structure can be expressed as Ni 1-b co b (OH) 2 ;

[0027] (2) Lithium nickel cobalt metal composite oxide:

[0028] a. Take the lithium compound and the above Ni 1-b Cob(OH) 2 , The M compound is mixed evenly by ball milling according to the stoichiometric ratio, and roasted at a temperature between 600°C and 720°C for 1 to 10 hours under an oxygen atmosphere;

[0029]b. roasting the product of step a at a temperature between 750° C. and 900° C. under an oxygen atmosphere for 8 to 20 hours;

[0030] c. the product obtained in step b is quenched, ball milled, and sieved to obtain a chemical formula of Li a Ni 1-b-c co b McO 2 lithium nickel cobalt metal composite oxide.

[0031] (3) the c step product lithium nickel cobalt metal composite oxide Li of step (2) a Ni 1...

Embodiment 1

[0041] High-cobalt spherical nickel Ni with a particle size of 8-10 μm 0.81 co 0.19 (OH) 2 After ball milling with 0.52 times the molar equivalent of lithium carbonate, the mixture was placed at 650°C, calcined under an oxygen atmosphere for 6 hours, and then calcined at 800°C for 16 hours to obtain a structure of LiNi 0.81 co 0.19 o 2 Li-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.

[0042] The above A and the average particle size D 50 Lithium cobalt oxide B with a thickness of 6-8 μm is mixed in a weight ratio of 80:20 as the positive electrode active material. Use PVDF as binder (amount of 2%), acetylene black as a conductive agent (amount of 3%), NMP as a solvent, stir (speed control is 300-6000rpm, time control is 0.2-10 hours) mix evenly, coating, Drying (these three processes all need to be carried out in a vacuum environment) and sheeting, so as to make the positive electrode she...

Embodiment 2

[0045] In this embodiment, the mixing ratio of the lithium-nickel-cobalt-oxygen composite metal oxide A and the lithium-cobalt oxide B is 75:25. Other than that, other processes are consistent with 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 the battery cathode material 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 lithium-ion secondary batteries are widely used, people's requirements for their various performances are also increasing, especially lithium-ion secondary batteries are required to have high comprehensive performance, that is: simultaneously have high discharge capacity, high discharge energy, Long cycle life, excellent high current performance. [0003] The cathode material is a key part of the lithium-ion secondary battery and is closely related to the various perfor...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M4/48H01M4/52H01M4/58H01M10/38H01M10/40
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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