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Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

一种正极活性物质、非水电解质的技术，应用在非水电解质二次电池领域，能够解决速率特性差、放电容量和放电电压降低等问题，达到成本方面优良的效果

Inactive Publication Date: 2014-07-30
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lithium iron phosphate having an olivine structure is used in a battery as a positive electrode active material, there is a problem that the rate characteristic is poor.
That is, there is a problem that the discharge capacity and the discharge voltage are greatly reduced due to an increase in the internal resistance of the battery with high-load discharge (large current discharge).

Method used

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  • Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (Manufacture of positive electrode active material)

[0085] Starting material, using LiCH 3 COO as lithium source, using FeC 2 o 4 2H 2 O as iron source, using ZrO(CH 3 COO) 2 As source of zirconium, Al(NO 3 ) 3 9H 2 O as Al source, using Sn(CH 3 COO) 2 As tin source, use (NH 4 ) 2 HPO 4 As a phosphorus source, use SiO 2 as a silicon source. to make LiCH as a lithium source 3 COO was 0.6599 g, and each of the above-mentioned substances was weighed so that the molar ratio of Li:Fe:Zr:P:Si was 1:0.96:0.04:1.02:0.04. Mix them well with an agate mortar. This mixture was pulverized and mixed using a planetary ball mill. The conditions of the ball mill were a rotation speed of 400 rpm and a rotation time of 1 hour. Balls made of zirconia with a diameter of 10 mm were used, and a jar made of zirconia was also used for the ball mill.

[0086] 15% by weight of sucrose relative to the obtained powder was dissolved in an aqueous solution, and the obtained powder...

Embodiment 2

[0104] (Manufacture of positive electrode active material)

[0105] Starting material, using LiCH 3 COO as lithium source, using FeC 2 o 4 2H 2 O as iron source, using ZrO(CH 3 COO) 2 As zirconium source, use (NH 4 ) 2 HPO 4 As a phosphorus source, use SiO 2 as a silicon source. to make LiCH as a lithium source 3 COO was 0.5345 g, and each of the above-mentioned substances was weighed so that the molar ratio of Li:Fe:Zr:P:Si was 0.81:0.96:0.04:0.83:0.08. Mix them well with an agate mortar. Put the obtained powder into SiO 2 Make a crucible, calcine at a calcination temperature of 550°C, a calcination time of 12 hours, a heating and cooling rate of 200°C / hour, and a nitrogen atmosphere to synthesize the intermediate Li 0.81 Fe 0.96 Zr 0.04 P 0.83 Si 0.08 o 4 single phase powder.

[0106] Next, a lithium source and a phosphorus source that are insufficient in stoichiometry are additionally mixed. The additional material is the same as the starting material, a...

Embodiment 3～22

[0114] (Manufacture of positive electrode active material)

[0115] In addition to making LiCH as a lithium source 3 COO was 0.6599 g and Li:Fe:Zr:P:Si was weighed so that the molar ratios described in Table 2 were the above-mentioned substances, and the powder of the composition ratio described in Table 2 was synthesized by the same procedure as Example 1.

[0116] Using the obtained powder, a positive electrode was produced in the same manner as in Example 1, and charge and discharge measurements were performed.

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Abstract

A positive electrode active material for a non-aqueous electrolyte secondary battery according to the present invention comprises a lithium-containing transition metal phosphoric acid salt containing lithium and a transition metal, wherein each of a transition metal site and a phosphorous site in the lithium-containing transition metal phosphoric acid salt is substituted by an element other than elements contained in the lithium-containing transition metal phosphoric acid salt, and wherein the content of the phosphorous site is excess relative to the stoichiometric ratio of the phosphorous site in the lithium-containing transition metal phosphoric acid salt. The positive electrode active material is excellent with respect to safety and cost, and enables the provision of a high-output and large-capacity secondary battery having excellent rate properties.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a positive electrode for a nonaqueous electrolyte secondary battery, and a nonaqueous electrolyte secondary battery. Background technique [0002] Lithium secondary batteries are being put into practical use and widely used as secondary batteries for portable electronic devices. In addition, in recent years, lithium secondary batteries have attracted attention not only as small batteries for portable electronic devices but also as high-output, high-capacity devices for automotive use and power storage. Therefore, the requirements for safety, cost, life, etc. are further increased. [0003] A lithium secondary battery has a positive electrode, a negative electrode, an electrolytic solution, a separator, and an exterior material as its main constituent elements. In addition, the positive electrode is composed of a positive electrode act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45C01B33/00H01M4/136H01M10/05
CPCC01B25/45H01M4/136H01M4/5805H01M10/052H01M4/5825H01M4/623Y02E60/10
Inventor 上村雄一西岛主明吉江智寿大平耕司
Owner SHARP KK
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