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Lithium ion battery composite material and preparation method thereof, and positive electrode material including composite material

A technology of lithium-ion batteries and composite materials, which is applied in the field of positive electrode materials, batteries, and lithium-ion battery composite materials. The effect of depth and charge and discharge capacity

Active Publication Date: 2016-07-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the description of the method, the manganese in the lithium manganese iron phosphate with the core-shell structure is in the core layer, which avoids its direct contact with the electrolyte and causes its dissolution, and solves the problem of manganese dissolution, but the material with this structure still has a low discharge depth. , The problem of low charge and discharge capacity

Method used

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  • Lithium ion battery composite material and preparation method thereof, and positive electrode material including composite material

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preparation example Construction

[0022] This application also proposes a preparation method for lithium -ion battery composite materials, including:

[0023] (1) Mixing the lithium source, phosphorus source, and iron source according to measurement ratio, the reaction to get the front -drive A, the reaction temperature is 105 ~ 130 ° C, and the response time is 1 ~ 30min;

[0024] (2) Mix the lithium source, phosphorus source, railway source, manganese source according to measurement, and react with the front drive A to get the front -drive B, the reaction temperature is 105 ~ 120 ° C, and the response time is 1 ~ 30min;

[0025] (3) Mix the lithium sources, phosphorus sources, and iron sources with the front -drive body B, and wash the reaction product and dry the core of the core as the lithium iron phosphate, the outer nucleus is manganese -phosphate iron lithium, and the shell layer is a composite material for lithium iron phosphate.The reaction temperature is 160 ~ 220 ° C, and the reaction time is 2 ~ 30 mi...

Embodiment 1- Embodiment 5

[0035] Example 1-Example 5: Preparation of Lithium-ion battery composite materials.

Embodiment 1

[0037] (1) Under the protection of nitrogen, the concentration of 0.25 mol / L sulfate sulfate solution, and the concentration of 0.5 mol / L phosphate solution, then add the phosphate solution to the sulfate solution to form a mixed solution, and then add 5g of antimediaHybrid solution E1.Under the protection of nitrogen, the formulation concentration is 0.750mol / L lithium hydroxide F1 solution.In the stirring state, add the lithium hydroxide solution F1 to the mixed solution E1. During the mixing process, the emulsifier is mixed to obtain a front drive A containing phosphorus, iron, and lithium. Among them, li: Fe: P = 3: 0.98: 1.

[0038] (2) Under the protection of nitrogen, it is called 2335.32g sulfate and 2637.02g manganese sulfate to remove ionic water to make a mixed solution.A mixed solution is formed, and then 10g of antibody acid is added to form a hybrid solution E2.Under the protection of nitrogen, the preparation concentration is 2.88mol / L lithium hydroxide solution F2....

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Abstract

The invention provides a lithium ion battery composite material and a preparation method thereof, and a positive electrode material including the composite material; the composite material includes lithium iron phosphate and at least 2 layers of shell bodies coating the surface of the lithium iron phosphate; the first layer of shell body is lithium manganese iron phosphate, and the second layer of shell body is lithium iron phosphate. The invention also provides the lithium ion battery positive electrode material including the lithium ion battery composite material, a conductive agent and a binder. The lithium ion battery composite material provided by the invention can obviously improve the discharge depth of the battery and the discharge capacity of the battery.

Description

Technical field [0001] The present invention belongs to the field of lithium -ion batteries, especially for a lithium -ion battery composite material, and the positive electrode material and battery containing the composite material. Background technique [0002] Lithium ion battery has the advantages of high voltage, larger energy, and good safety performance. As a limnpo as a lithium -ion battery positive active activity material 4 Since there is lifpo 4 Similar structures have the same theoretical capacity, but their discharge platform voltage and LIFEPO 4 Compared with large improvements, the energy density has increased significantly.But with LIFEPO 4 Compared to Limnpo 4 Poor conductive capacity, affected by the Jahn-Teller effect during the charging and discharge process, limnpo 4 The depth of the discharge is low, the actual capacity is low, and the percentage performance and cycle performance are also poor. In addition, in the process of charging and discharge, MN ions a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/136
CPCY02E60/10
Inventor 蔡志炬曹文玉肖峰
Owner BYD CO LTD
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