Negative electrode active material particle, negative electrode, lithium ion secondary battery, and method of producing negative electrode active material particle
First Claim
Patent Images
1. A negative electrode active material particle for a lithium ion secondary battery, the negative electrode active material particle consisting of a composition represented by the following formula (I):
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SiOxDy
(I), wherex satisfies 0≤
x≤
1.5,D is at least one element selected from the group consisting of B, Al, Ga and In,in an outermost surface of the negative electrode active material particle, y satisfies 10−
11≤
y≤
10−
1, andin a center of the negative electrode active material particle, y satisfies y≤
10−
12.
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Abstract
A negative electrode active material particle has a composition represented by the following formula (I): SiOxDy . . . (I). In the formula (I), x satisfies 0≤x≤1.5. D is a group 13 element or a group 15 element in a periodic table. In an outermost surface of the negative electrode active material particle, y satisfies 10−11≤y≤10−1. In a center of the negative electrode active material particle, y satisfies y≤10−12.
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Citations
9 Claims
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1. A negative electrode active material particle for a lithium ion secondary battery, the negative electrode active material particle consisting of a composition represented by the following formula (I):
-
SiOxDy
(I), wherex satisfies 0≤
x≤
1.5,D is at least one element selected from the group consisting of B, Al, Ga and In, in an outermost surface of the negative electrode active material particle, y satisfies 10−
11≤
y≤
10−
1, andin a center of the negative electrode active material particle, y satisfies y≤
10−
12. - View Dependent Claims (2, 4, 5)
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3. A negative electrode active material particle for a lithium ion secondary battery, the negative electrode active material particle consisting of a composition represented by the following formula (I):
-
SiOxDy
(I), wherex satisfies 0≤
x≤
1.5,D is at least one element selected from the group consisting of P, As and Sb, in an outermost surface of the negative electrode active material particle, y satisfies 10−
11≤
y≤
10−
1, andin a center of the negative electrode active material particle, y satisfies y≤
10−
12. - View Dependent Claims (7, 8, 9)
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6. A method of producing a negative electrode active material particle for a lithium ion secondary battery, the method comprising:
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preparing a base material particle having a composition represented by the following formula (II);
SiOx . . . (II), where x satisfies 0≤
x≤
1.5; and
either(i) doping the base material particle with an effective amount of at least one group 13 dopant element selected from the group consisting of B, Al, Ga and In to form a negative electrode active material particle having a ratio of an atomic concentration of the at least one group 13 dopant element to an atomic concentration of Si of more than or equal to 10−
11 and less than or equal to 10−
1 in an outermost surface of the negative electrode active material particle, where the doping of the base material particle is conducted such that the ratio of the atomic concentration of the at least one group 13 dopant element to the atomic concentration of Si is less than or equal to 10−
12 in a center of the negative electrode active material particle;
or(ii) doping the base material particle with an effective amount of at least one group 15 dopant element selected from the group consisting of P, As and Sb to form a negative electrode active material particle having a ratio of an atomic concentration of the at least one group 15 dopant element to an atomic concentration of Si of more than or equal to 10−
11 and less than or equal to 10−
1 in an outermost surface of the negative electrode active material particle, where the doping of the base material particle is conducted such that the ratio of the atomic concentration of the at least one group 15 dopant element to the atomic concentration of Si is less than or equal to 10−
12 in a center of the negative electrode active material particle.
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Specification
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Current AssigneeToyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
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Original AssigneeToyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
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InventorsOhsawa, Ryosuke, Tsujiko, Akira
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Primary Examiner(s)Pyon, Harold Y
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Assistant Examiner(s)Kang, Danny N
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Application NumberUS16/003,521Publication NumberTime in Patent Office494 DaysField of SearchUS Class CurrentCPC Class CodesC01B 33/18 Preparation of finely divid...C01P 2002/54 one element onlyC01P 2006/40 Electric propertiesH01M 10/0525 Rocking-chair batteries, i....H01M 2004/027 Negative electrodesH01M 4/131 Electrodes based on mixed o...H01M 4/366 as layered productsH01M 4/485 of mixed oxides or hydroxid...H01M 4/5825 Oxygenated metallic salts o...Y02E 60/10 Energy storage using batteries
