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Anode materials for lithium ion batteries and methods of making and using same

專利號
US11177471B2
公開日期
2021-11-16
申請人
JOHNSON MATTHEY PUBLIC COMPANY LIMITED（GB London）
發(fā)明人
Fuxia Sun
IPC分類
H01M4/36; H01M4/62; H01M10/0525; H01M4/134; H01M4/38; C22C24/00; C22C28/00; H01M4/02
技術(shù)領(lǐng)域
alloy,no3,silicon,ee,wt,electrode,lipaa,lithium,metal,coated
地域： London

摘要

An electrochemically active material includes a silicon alloy material having the formula: SiwM1xCyOz, where w, x, y, and z represent atomic % values and w+x+y+z=1; M1 comprises a transition metal; w>0; x>0; y≥0; and z≥0. The electrochemically active material also includes a metal-based material having the formula: M2aObAc, where a, b, and c represent atomic % values and a+b+c=1; M2 comprises a metal; A is an anion; a>0; b≥0; and c≥0.

說明書

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional Application Ser. No. 62/435,240, filed Dec. 16, 2016, the disclosure of which is incorporated by reference in its entirety herein.

FIELD

The present disclosure relates to compositions useful in anodes for lithium ion batteries and methods for preparing and using the same.

BACKGROUND

Various anode compositions have been introduced for use in lithium-ion batteries. Such compositions are described, for example, in U.S. Pat. No. 8,071,238 and U.S. Patent Application Publication 2014/0057176.

SUMMARY

In some embodiments, an electrochemically active material is provided. The electrochemically active material includes a silicon alloy material having the formula:
SiwM1xCyOz,
where w, x, y, and z represent atomic % values and w+x+y+z=1; M1 comprises a transition metal; w>0; x>0; y≥0; and z≥0. The electrochemically active material also includes a metal-based material having the formula:
M2aObAc,
where a, b, and c represent atomic % values and a+b+c=1; M2 comprises a metal; A is an anion; a>0; b≥0; and c≥0.

In some embodiments, an electrode composition is provided. The electrode composition includes the above-described electrochemically active material and a binder.

In some embodiments, a negative electrode is provided. The negative electrode includes a current collector and the above-described electrode composition.

權(quán)利要求

1
What is claimed:1. An electrochemically negative active material capable of incorporation into an anode, the electrochemically negative active material comprising:a silicon alloy material comprising an active phase having the formula:
SiwM1xCyOz,where w, x, y, and z represent atomic % values and w+x+y+z=1;M1 comprises Sn, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Mg, Al, W, Mo, B, or P; w >0;x >0; y >0; and z >0; anda metal-based material having the formula:
M2aObAc, where a, b, and c represent atomic % values and a+b+c=100%;M2 comprises Si, Ti, Mg, Mn, Co, Ni, Cu or Zn;A is an anion;a >0; b >0; and c >0, provided that at least one of b and c is not zero; andwherein the silicon alloy material and the metal-based material contact one another.2. The electrochemically negative active material according to claim 1, wherein A is an anion comprising a hydroxide, nitrate, carbonate, sulfate, phosphate, acetate, fluoride, chloride, bromide, iodide, PO3, or P2O7.3. The electrochemically negative active material according to claim 1, wherein the electrochemically negative active material comprises the silicon alloy material in an amount of between 50 and 99 wt. %, based on the total weight of the electrochemically active material.4. The electrochemically negative active material according to claim 3, wherein the electrochemically negative active material comprises the metal-based material in an amount of between 0.1 and 20 wt. %, based on the total weight of the electrochemically active material.5. The electrochemically negative active material according to claim 3, wherein the Scherrer grain size of the active phase of the silicon alloy material is no greater than 50 nanometers.6. The electrochemically negative active material according to claim 1, wherein the silicon alloy material is present as particles, and wherein the metal-based material is present as a coating disposed on the particles.7. A negative electrode composition comprising:the electrochemically active material according to claim 1; anda binder.8. A negative electrode composition according to claim 7, further comprising graphite.9. A negative electrode comprising:the negative electrode composition according to claim 7; anda current collector.10. An electrochemical cell comprising:the negative electrode of claim 9;a positive electrode comprising a positive electrode composition comprising lithium; andan electrolyte comprising lithium.11. An electronic device comprising the electrochemical cell according to claim 10.12. A method of making an electrochemical cell, the method comprising:providing a positive electrode comprising a positive electrode composition comprising lithium;providing a negative electrode according to claim 9;providing an electrolyte comprising lithium; andincorporating the positive electrode, negative electrode, and the electrolyte into an electrochemical cell.
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