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Positive electrode active material for lithium-ion batteries, positive electrode for lithium-ion batteries, and lithium-ion battery

A positive active material, lithium-ion battery technology, applied to battery electrodes, lithium batteries, electrolytes, etc., can solve problems such as fire and thermal runaway

Inactive Publication Date: 2012-11-14
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the rate of heat generation inside the battery exceeds the rate of heat release to the outside of the battery, it will cause thermal runaway, resulting in fire

Method used

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  • Positive electrode active material for lithium-ion batteries, positive electrode for lithium-ion batteries, and lithium-ion battery
  • Positive electrode active material for lithium-ion batteries, positive electrode for lithium-ion batteries, and lithium-ion battery
  • Positive electrode active material for lithium-ion batteries, positive electrode for lithium-ion batteries, and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5）

[0049] First, after suspending the amount of lithium carbonate added in Table 1 in 3.2 L of pure water, 4.8 L of the metal salt solution was added. Here, in the metal salt solution, the nitrate hydrate of each metal was adjusted so that each metal had the composition ratio described in Table 1, and the total number of moles of the metals was adjusted to be 14 moles.

[0050] Then, the suspended amount of lithium carbonate is Li x (Ni y m 1－y )O z The quantities representing the product (lithium-ion secondary battery cathode material, ie, cathode active material) and x being the values ​​in Table 1 were calculated from the following formulas, respectively.

[0051] W(g)=73.9×14×(1+0.5x)×A

[0052] In the above formula, A is a numerical value multiplied in order to subtract the amount of lithium of lithium compounds other than lithium carbonate remaining in the raw material after filtration from the suspended amount in addition to the amount necessary for the precipitation r...

Embodiment 6～7）

[0057] In Example 6, the same treatment as in Examples 1 to 5 was performed except that the metals of the raw materials had the composition shown in Table 1, and the calcining was performed under a pressure of 120 KPa instead of atmospheric pressure. Furthermore, in Example 7, the same treatment as in Example 6 was performed except that each metal of the raw material had the composition shown in Table 1 and was calcined under a pressure of 180 KPa.

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Abstract

Disclosed is a positive electrode active material for lithium ion batteries, with which it is possible to provide lithium ion batteries with outstanding safety. The positive electrode active material for lithium ion batteries has a layered structure, and is represented by the composition formula: Lix(NiyM1-y)Oz (in the formula, M is Mn and Co, x falls within the range of 0.9 to 1.2, y falls within the range of 0.8 +- 0.025, and z falls within the range of 1.8 to 2.4). After a lithium ion battery obtained using a positive electrode mixture prepared using 91wt% positive electrode active material, 4.2wt% binder and 4.8% conductive material is charged until the voltage reaches 4.3V, the difference [delta]T = T1 - T2 (where T2 < T1) described below satisfies [delta]T >= 13 ( DEG C). T1 is a first exothermic peak temperature (DEG C) obtained by differential scanning calorimetry (DSC) at a rate of increase in temperature of 5 DEG C / minute of 1.0mg of positive electrode mixture together with an electrolyte obtained by dissolving 1M-LiPF6 in a mixed solvent of ethylene carbonate (EC) - dimethyl carbonate (DMC) (volume ratio 1:1), and T2 is a temperature (DEG C) at half the first exothermic peak intensity.

Description

technical field [0001] The invention relates to a positive pole active material for a lithium ion battery, a positive pole for a lithium ion battery and a lithium ion battery. Background technique [0002] Compared with nickel-cadmium batteries or nickel-metal hydride batteries, lithium-ion batteries using lithium materials that have a small specific gravity and are prone to electrochemical reactions can store 2 to 3 times the energy with the same weight. Lithium-ion batteries have the above-mentioned excellent advantages, but on the other hand, they have problems in terms of safety. [0003] So far, with regard to lithium-ion batteries, many reports have pointed out that due to various reasons, the materials in the battery burn, resulting in abnormal heat generation of the battery and fire accidents. This abnormal heating or catching fire of lithium-ion batteries is called "thermal runaway". When the temperature of the battery rises, the materials inside the battery decom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/505
CPCC01G53/50H01M4/525H01M10/052C01P2006/40C01P2002/54H01M2300/0037Y02E60/122C01P2002/88H01M10/0569H01M4/131H01M4/505H01M4/624H01M2004/021H01M4/1391Y02E60/10H01M10/0525
Inventor 佐藤博人
Owner JX NIPPON MINING & METALS CORP