公开(公告)号：US20230268515A1

公开(公告)日：2023-08-24

申请号：US18309235

申请日：2023-04-28

Applicant: BYD COMPANY LIMITED

Inventor： NA CHEN ,  RONG HAO ,  Yi PAN

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/133 ,  H01M4/505 ,  H01M4/587

CPC classification number: H01M4/628 ,  H01M4/131 ,  H01M4/133 ,  H01M4/505 ,  H01M4/587 ,  H01M10/0525

Abstract: A positive electrode active material of a lithium ion battery includes lithium manganese iron phosphate and a ternary material. A negative electrode active material is graphite. The lithium ion battery meets the following formulas:






1.08
≤





M
3

*

η
3

*
y



/






M
1

*

η
1

*

A
1

+

M
2

*

η
2

*

A
2



*
x








≤
1.12
 
and












0.49
≤





M
1

*


1
-
 

η
1



*

A
1

+

M
2

*


1
-

η
2



*

A
2



*
x

/




M
3

*


1
 
-

η
3



*
y








≤
1.15






where M1 is the first-charge specific capacity of lithium manganese iron phosphate; η1, is the initial efficiency of lithium manganese iron phosphate; A1 is the percent by mass of lithium manganese iron phosphate in the positive electrode active material; M2 is the first-charge specific capacity of the ternary material; η2 is the initial efficiency of the ternary material; A2 is the percent by mass of the ternary material in the positive electrode active material; M3 is the first-discharge specific capacity of graphite; η3 is the initial efficiency of graphite; and x and y are the coating amounts of the positive electrode active material and the negative electrode active material, respectively.

公开(公告)号：US20230282827A1

公开(公告)日：2023-09-07

申请号：US18315441

申请日：2023-05-10

Applicant: BYD COMPANY LIMITED

Inventor： NA CHEN ,  RONG HAO ,  YI PAN

IPC: H01M4/583 ,  H01M10/0525 ,  H01M4/525 ,  H01M50/434 ,  H01M50/489 ,  H01M50/451 ,  H01M50/414

CPC classification number: H01M4/583 ,  H01M10/0525 ,  H01M4/525 ,  H01M50/434 ,  H01M50/489 ,  H01M50/451 ,  H01M50/414 ,  H01M2004/028

Abstract: Provided is a lithium-ion battery, including a positive electrode plate, a separator, and a negative electrode plate. The separator is arranged between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active layer laminated in sequence. A positive electrode active material in the positive electrode active layer includes lithium manganese iron phosphate and a ternary material. The negative electrode plate includes a negative electrode current collector and a negative electrode active layer laminated in sequence. The negative electrode active layer includes a composite layer and a lithium replenishing layer. A negative electrode active material in the composite layer includes a carbon material and SiOx. An areal density of lithium in the lithium replenishing layer is m2=a*M1*m1*δ*(1−η)/M2.