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Positive electrode active material particles for non-aqueous electrolyte secondary battery and production method therefor, and non-aqueous electrolyte secondary battery

A positive electrode active material and non-aqueous electrolyte technology, which is applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of secondary battery ignition and poor thermal stability, and achieve the effects of small resistance increase, excellent structural stability, and high cycle characteristics

Pending Publication Date: 2020-11-17
BASF TODA BATTERY MATERIALS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the positive electrode material with layered rock salt structure based on Ni has poor thermal stability compared with lithium cobalt oxide or lithium manganese oxide, and compared with the above materials, the structure is destroyed at low temperature to release oxygen and react with the electrolyte , causing so-called thermal runaway, which causes the secondary battery to catch fire, etc.

Method used

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  • Positive electrode active material particles for non-aqueous electrolyte secondary battery and production method therefor, and non-aqueous electrolyte secondary battery
  • Positive electrode active material particles for non-aqueous electrolyte secondary battery and production method therefor, and non-aqueous electrolyte secondary battery
  • Positive electrode active material particles for non-aqueous electrolyte secondary battery and production method therefor, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0222] Nickel sulfate aqueous solution, cobalt sulfate aqueous solution, and magnesium sulfate aqueous solution are mixed, make the ratio (molar ratio) of Ni and Co and Mg be Ni: Co: Mg=89.0: 8.5: 0.5, obtain mixed aqueous solution (the amount of Mg is Mg / (Ni+Co+Mg+Al)×100=0.5 mol%). Separated from this mixed aqueous solution, an aqueous sodium aluminate solution was prepared such that the amount of Al was Al / (Ni+Co+Mg+Al) x 100 = 2.0 mol%. In the reaction tank, prepare in advance the pure water 10L that added 300g of sodium hydroxide aqueous solution and ammoniacal liquor 500g as mother liquor, pass through N with the flow rate of 0.7L / min 2 Gas pairing reaction tank for N 2 purge. It should be noted that N 2 purge.

[0223] Then, while rotating the stirring blade at 1000rpm, the above-mentioned mixed aqueous solution, sodium aluminate aqueous solution, sodium hydroxide aqueous solution, and ammonia water were added dropwise at a predetermined speed at the same time, and...

Embodiment 2

[0226] In Example 1, an aqueous nickel sulfate solution, an aqueous cobalt sulfate solution, and an aqueous magnesium sulfate solution were mixed so that the ratio (molar ratio) of Ni to Co to Mg was Ni: Co: Mg=89.0: 8.2: 0.8 to obtain a mixed aqueous solution ( The amount of Mg is Mg / (Ni+Co+Mg+Al)×100=0.8mol%), and the sodium aluminate aqueous solution is prepared so that the amount of Al is Al / (Ni+Co+Mg+Al)×100=2.0mol %, react under the same conditions as in Example 1, and synthesize the precursor compound. Except for this, positive electrode active material particles as a layered lithium composite oxide were obtained in the same manner as in Example 1.

Embodiment 3

[0228] In Example 1, an aqueous nickel sulfate solution, an aqueous cobalt sulfate solution, and an aqueous magnesium sulfate solution were mixed so that the ratio (molar ratio) of Ni to Co to Mg was Ni:Co:Mg=89.0:8.0:1.0 to obtain a mixed aqueous solution ( The amount of Mg is Mg / (Ni+Co+Mg+Al)×100=1.0mol%), and the sodium aluminate aqueous solution is prepared so that the amount of Al is Al / (Ni+Co+Mg+Al)×100=2.0mol %, react under the same conditions as in Example 1, and synthesize the precursor compound. Except for this, positive electrode active material particles as a layered lithium composite oxide were obtained in the same manner as in Example 1.

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Abstract

Positive electrode active material particles according to the present invention each having a layered rock salt structure and being represented by compositional formula (LiGammaXe)(NiaCobXcZd)O2 (in the formula, X represents a divalent metallic element optionally substituted with a Li site, Z's represent metallic elements at least including Al and / or Mn but excluding X, and 0.93<=Gamma<=1.15, 0.82<=a<=1.00, 0<=b<=0.12, 0.001<=c+e<=0.040, 0<=d<=0.10, and a+b+c+d=1 are satisfied) help maintain battery capacity at a sufficient level, and exhibit high cycle characteristics and excellent thermal stability.

Description

technical field [0001] The present invention relates to a positive electrode active material particle for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery. The battery capacity is excellent in structural stability, resistance increase is small, cycle characteristics are high, and thermal stability is also excellent. Background technique [0002] In recent years, the popularization of electronic devices such as portable and wireless mobile phones and notebook computers has developed rapidly. Non-aqueous secondary batteries are used as driving power sources for these devices, and they are small, lightweight and have high energy density. Among them, a lithium-ion secondary battery is widely used in which a material such as lithium cobalt oxide or lithium nickel oxide is used for the positive electrode and has the advantage of large charge and discharge capacity. [0003] Lithium cobaltate is an excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/10H01M4/525H01M4/131Y02P70/50C01G53/40C01G53/42C01P2002/52C01P2006/40C01P2004/60C01P2002/60C01P2004/61C01P2002/88H01M4/505C01G53/50H01M4/0471H01M10/0427H01M10/0525H01M2004/028
Inventor 柏木顺次西川大辅中村聪志石崎和俊古贺一路野口宙干杉原毅彦松本和顺
Owner BASF TODA BATTERY MATERIALS LLC
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