Unlock instant, AI-driven research and patent intelligence for your innovation.

A double-doped lithium-rich solid solution cathode composite material and preparation method thereof, cathode sheet for lithium ion battery and lithium ion battery

A technology for lithium ion batteries and composite materials, which is applied in the field of double-doped lithium-rich solid solution positive electrode composite materials and its preparation, and the field of positive plates for lithium ion batteries, can solve problems such as voltage platform drop, and achieve stable voltage platform, long cycle life, The effect of excellent rate performance and charge-discharge efficiency

Active Publication Date: 2018-11-20
HUAWEI TECH CO LTD +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the first aspect of the embodiment of the present invention provides a dual-doped lithium-rich solid solution positive electrode composite material, which is used to solve the problem of voltage plateau drop caused by structural collapse of lithium-rich solid solution positive electrode materials in the prior art.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A double-doped lithium-rich solid solution cathode composite material and preparation method thereof, cathode sheet for lithium ion battery and lithium ion battery
  • A double-doped lithium-rich solid solution cathode composite material and preparation method thereof, cathode sheet for lithium ion battery and lithium ion battery
  • A double-doped lithium-rich solid solution cathode composite material and preparation method thereof, cathode sheet for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A double-doped lithium-rich solid solution cathode composite material (0.4Li 2 MnO 3 0.6LiNi 0.38 co 0.24 mn 0.38 o 2 0.05NaF) preparation method, comprising the following steps:

[0045] Take manganese acetate, nickel acetate, and cobalt acetate and dissolve them in distilled water at a molar ratio of 4.4:1.6:1 to obtain a transition metal salt solution with a total concentration of manganese, nickel, and cobalt of 1mol / L; dissolve LiOH in distilled water , making OH - The concentration is 2mol / L of OH - solution; under the condition of continuous stirring, 80ml of the transition metal salt solution was added to 100ml OH at a speed of 2ml / s - In the solution, a precipitate is formed in the prepared mixed solution. After the color of the mixed solution gradually changes from white to brown, continue to stir for 1 hour, then let it stand for 24 hours to obtain a solid-liquid mixed solution, filter, and collect the solid-liquid mixed solution In the brown precipit...

Embodiment 2

[0052] A double-doped lithium-rich solid solution cathode composite material (0.5Li 2 MnO 3 0.5LiNi 0.38 co 0.24 mn 0.38 o 2 0.02KF) preparation method, comprising the following steps:

[0053] Get manganese nitrate, nickel nitrate and cobalt nitrate and dissolve them in distilled water at a ratio of 3.7:1.6:1 by molar ratio to obtain a transition metal salt solution whose total concentration of manganese, nickel and cobalt is 1mol / L; get NaOH and dissolve them in distilled water , making OH - The concentration is 2mol / L of OH - solution; under the condition of continuous stirring, 80ml of the transition metal salt solution was added to 100ml OH at a speed of 2ml / s - In the solution, a precipitate is formed in the prepared mixed solution. After the color of the mixed solution gradually changes from white to brown, continue to stir for 1 hour, then let it stand for 24 hours to obtain a solid-liquid mixed solution, filter, and collect the solid-liquid mixed solution In t...

Embodiment 3

[0057] A double-doped lithium-rich solid solution cathode composite material (0.55Li 2 MnO 3 0.45LiNi 0.0.4 co 0.2 mn 0.4 o 2 0.09Na 3 N) a preparation method comprising the following steps:

[0058] Get manganese sulfate, nickel sulfate, cobalt sulfate and be dissolved in distilled water in the ratio of 8.1:2:1 by molar ratio, the transition metal salt solution that the total concentration of making manganese, nickel and cobalt is 1mol / L; Take Na 2 CO 3 dissolved in distilled water to produce CO 3 2- The concentration of CO is 2mol / L 3 2- solution; under the condition of continuous stirring, 80ml of the transition metal salt solution was added to 100ml CO at a speed of 2ml / s 3 2- In the solution, a precipitate is formed in the prepared mixed solution. After the color of the mixed solution gradually changes from white to brown, continue to stir for 1 hour, then let it stand for 24 hours to obtain a solid-liquid mixed solution, filter, and collect the solid-liquid m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A dual-doped lithium-rich solid solution positive electrode composite, the chemical formula thereof being xLi2MnO3·(1-x)LiMO2·yMaMb, wherein 0＜x＜1, 0＜y＜0.1, M is one of or a combination of Ni, Co, Mn, Ti, Al, Zr, Fe, V, Mg, and W, Ma is one of or a combination of Na and K, and Mb is one of or a combination of F, N, and P; the dual-doped lithium-rich solid solution positive electrode composite solves the problem of the prior art of a voltage plateau drop caused by structural collapse during recirculation of a lithium-rich solid solution positive electrode material. Also provided is a preparation method for the positive electrode composite, containing a lithium-ion battery positive electrode plate of the positive electrode composite and containing a lithium-ion battery of the lithium-ion battery positive electrode plate.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a double-doped lithium-rich solid solution positive electrode composite material and a preparation method thereof, a lithium-ion battery positive plate and a lithium-ion battery. Background technique [0002] With the further improvement of the energy density of lithium-ion batteries, its application fields will gradually be applied to electric vehicles (electric bicycles, electric vehicles, hybrid vehicles), power grids and other large-scale energy storage fields. The development of cathode materials for lithium-ion batteries has become a key factor restricting the further improvement of the energy density of lithium-ion batteries. Currently commonly used positive electrode materials are: lithium cobalt oxide (LCO), lithium manganese oxide (LMO), lithium iron phosphate (LFP) and nickel-cobalt-manganese (NCM) ternary materials, etc., but the specific capacity of these positiv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/1315H01M4/505H01M4/525H01M10/0525C01G45/1228C01G45/1257C01G53/006C01G53/50C01P2002/50C01P2002/52Y02E60/10
Inventor 陈朝辉蒋建平杨勇李益孝王伟立
Owner HUAWEI TECH CO LTD