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Cathode material of secondary battery, and production method therefor

A technology of positive electrode materials and positive active materials, which is applied in the field of positive electrode materials and its preparation of secondary batteries, can solve the problems that the battery can no longer be used, the negative active material can not be used, and the capacity is reduced, so as to improve the characteristics of excessive discharge and prevent The effect of rapid rise and prevention of melting

Active Publication Date: 2017-03-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereafter, the negative active material cannot be used
As mentioned, when the copper foil undergoes an oxidation reaction, the capacity drops rapidly after overdischarge, making the battery unusable any more

Method used

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  • Cathode material of secondary battery, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0062] According to another exemplary embodiment of the present disclosure, there is provided a method for preparing a positive electrode material, comprising the steps of: (a) preparing a positive electrode active material using an active material precursor and a lithium compound; and (b) mixing the prepared positive electrode active material , conductive agents, binders, and active material precursors.

[0063] The active material precursor and lithium compound used in the step (a) of preparing the positive electrode active material using the active material precursor and lithium compound may use the aforementioned active material precursor and lithium compound.

[0064] The positive electrode material can be prepared by mixing the positive electrode active material prepared in step (a) with a conductive agent, a binder and an active material precursor, wherein the preparation of the positive electrode material can include sequentially mixing the conductive agent, the positiv...

Embodiment 1

[0079] 1-1. Preparation of cathode material

[0080] By mixing (Ni 6.0 mn 2.0 co 2.0 )OOH and LiOH and calcined at 800°C for 6 hours under atmospheric pressure to prepare the positive electrode active material, Li(Ni 6.0 mn 2.0 co 2.0 )O 2 .

[0081] By mixing 93.6% of the prepared positive electrode active material, 3.3% by weight of super-p as a conductive agent and 3.1% by weight of polyvinylidene fluoride as a binder, and then mixing 2.8% by weight (Ni 6.0 mn 2.0 co 2.0 )OOH, to prepare the positive electrode material.

[0082] Based on the total weight of the positive electrode active material mixture, add 2.8% by weight (Ni 6.0 mn 2.0 co 2.0 )OOH.

[0083] 1-2. Preparation of positive electrode

[0084] A positive electrode was prepared by coating the prepared positive electrode material on one surface of an aluminum (Al) foil collector, followed by drying and rolling, and then punching into a predetermined size.

[0085] 1-3. Preparation of negative...

experiment example

[0095] 1. Capacity test

[0096] A capacity test was conducted using the secondary batteries prepared by the Examples and Comparative Examples, which were performed under overdischarge conditions (1.0 to 4.25 V).

[0097] Charging and discharging conditions: 1st ~ 2nd cycle -3.0 ~ 4.25V interruption

[0098] The 3rd~50th cycle -1.0~4.25V interrupt

[0099] 2. Capacity maintenance rate (%)

[0100] Regarding the capacity retention rate, the discharge capacity retention rate at the 50th cycle was calculated against the discharge capacity at the 3rd cycle.

[0101] 【Table 1】

[0102] Active material precursor (additive) Discharge capacity maintenance rate weight% ％ Example 1 2.8 38.5 Comparative example 1 0 30.1 Comparative example 2 5.8 33.3

[0103] figure 1 is a graph showing the charging and discharging capacity test results of Examples and Comparative Examples.

[0104] like figure 1 As shown, in the initial stage of over...

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Abstract

The present invention relates to a cathode material comprising: a cathode active material mixture comprising: a cathode active material produced from an active material precursor and a lithium compound, a conductive material and a binder; and an active material precursor as an additive, wherein the active material precursor as an additive is the same as the active material precursor as a material of the cathode active material.

Description

technical field [0001] Exemplary embodiments of the present disclosure relate to a positive electrode material of a secondary battery and a method of preparing the same. Background technique [0002] Recent developments in mobile communication and information and electronics industries have created a continuously increasing demand for secondary batteries that are light in weight but provide high capacity. However, when overcharged or short-circuited, the secondary battery overheats, which may cause combustion or explosion. When excessively discharged below the normal voltage range, the capacity decreases rapidly and the battery may enter a state where the battery cannot be used. [0003] For these reasons, batteries are always equipped with safety devices, such as protection circuits and PTCs, which were first developed. However, protection circuits and PTCs are expensive and take up significant volume, resulting in an undesirably increased battery price, size and weight. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/58H01M4/525H01M4/1391H01M10/052
CPCH01M4/136H01M4/1391H01M4/505H01M4/5825C01G53/50C01P2006/40H01M4/58H01M10/052H01M4/131H01M4/525H01M4/523Y02E60/10
Inventor 郑周昊黄圭玉黄随枝朴洪奎
Owner LG ENERGY SOLUTION LTD
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