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Positive electrode active material, positive electrode using same, and lithium ion secondary battery

A positive electrode active material and secondary battery technology, applied in the direction of active material electrodes, secondary batteries, positive electrodes, etc., can solve the problems of inability to obtain high-temperature storage characteristics and cycle characteristics, and achieve the effect of high rate characteristics

Active Publication Date: 2018-10-09
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using the LiVOPO 4 Even in lithium-ion secondary batteries, sufficient high-temperature storage characteristics and cycle characteristics cannot be obtained.

Method used

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  • Positive electrode active material, positive electrode using same, and lithium ion secondary battery
  • Positive electrode active material, positive electrode using same, and lithium ion secondary battery
  • Positive electrode active material, positive electrode using same, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] (production of positive electrode)

[0123]

[0124] Add 23.06g (0.20mol) of H in a 500ml Erlenmeyer flask 3 PO 4 (manufactured by Nacalai Tesque, purity 85%) and 200 g of distilled water (manufactured by Nacalai Tesque, for HPLC) were stirred with a magnetic stirring bar. Next, add 18.37g (0.10mol) of V 2 o 5 (manufactured by Nacalai Tesque Co., purity 99%), stirring was continued for about 2.5 hours. Then, 2.55g (0.05mol) of (NH 2 NH 2 ·H 2 O), continue to stir for 1 hour. Thereafter, it took about 10 minutes to add 8.48 g (0.20 mol) of LiOH·H 2 O (manufactured by Nacalai Tesque, purity: 99%). The pH of the contents of the container was immediately measured and, as a result, the pH was 6. Next, after adding 20 g of distilled water to the obtained pasty substance, the contents in the flask were transferred to a glass cylindrical container in a 0.5 L autoclave. The container was sealed, the heater was turned on, and the temperature was kept at 200° C. for 4...

Embodiment 2

[0137] In the hydrothermal synthesis step, except that the heating temperature was set to 250° C. and the heating holding time was set to 6 hours, a battery of Example 2 was fabricated and evaluated in the same manner as in Example 1.

Embodiment 3

[0139] In the hydrothermal synthesis step, except that the heating temperature was set to 300° C. and the heating holding time was set to 8 hours, a battery of Example 3 was produced and evaluated in the same manner as in Example 1.

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Abstract

The present invention provides a positive electrode active material having excellent high-temperature storage characteristics and cycle characteristics, a positive electrode and a lithium ion secondary battery. The positive electrode active material (for the lithium ion secondary battery) is characterized in that a compound represented by LiaMb(PO4)c contains crystallization water. (M includes atleast one selected from Fe, Mn, Co, Ni, VO, V, and 1<=a<=4, 1<=b<=2, 1<=c<=3.)

Description

technical field [0001] The present invention relates to a positive electrode active material, a positive electrode using the same, and a lithium ion secondary battery. Background technique [0002] Conventionally, LiCoO has been used as a positive electrode material (positive electrode active material) for lithium-ion secondary batteries. 2 、LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 layered compounds such as LiMn 2 o 4 and other spinel compounds. In recent years, attention has been paid to LiFePO 4 Compounds represented by olivine structures. A positive electrode material having an olivine structure is known to have high thermal stability at high temperatures and high safety. [0003] However, using LiFePO 4 The current lithium-ion secondary battery has the disadvantages that its charging and discharging voltage is as low as about 3.5V, and its energy density is reduced. Therefore, as a phosphoric acid-based cathode material capable of achieving a high charge-discharge voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M10/0525C01B25/45
CPCC01B25/45H01M4/136H01M4/5825H01M10/0525C01P2006/80H01M10/0569H01M2004/028Y02E60/10C01P2006/40H01M2300/0037
Inventor 藤田慎
Owner TDK CORPARATION